HomeMy WebLinkAboutResolution No. 2020-01RESOLUTION NO. R2020-01
A RESOLUTION OF THE CITY COUNCIL OF THE CITY
OF FRIENDSWOOD, TEXAS, DESIGNATING THE MAYOR
AS THE CITY'S REPRESENTATIVE IN SEEKING
ELIGIBLE GRANT FUNDS UNDER GENERAL VICTIM
ASSISTANCE DIRECT SERVICES PROGRAM; AND
AUTHORIZING THE SUBMISSION OF SUCH GRANT
APPLICATION TO THE CRIMINAL JUSTICE DIVISION
OF THE OFFICE OF GOVERNOR.
WHEREAS, the City Council of the City of Friendswood, Texas hereby finds and
determines that continuation of the Friendswood Police Department Crime Victim Assistance
Program is in the best interests of the citizens of Friendswood; and
WHEREAS, the City agrees to provide applicable matching funds for the said program as
required by the General Victim Assistance Direct Services Program grant application; and
WHEREAS, the City agrees that in the event of loss or misuse of any Criminal Justice
Division grant funds, the City assures that the funds will be returned to the Criminal Justice
Division in full; and
WHEREAS, the City Council hereby further finds and determines that the person serving
as Mayor of the City is the appropriate individual to act as the City's authorized official, and as
such should be given the power to apply for, accept, reject, alter or terminate the grant on behalf
of the City,
NOW THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF
FRIENDSWOOD, TEXAS:
Section 1. The facts and matters set forth in the preamble of this Resolution are hereby
found to be true and correct.
Section 2. The City Council of the City of Friendswood, Texas, hereby authorizes and
approves the submission of a grant application, pursuant to the General Victim Assistance Direct
Services Program, to the Office of the Governor, Criminal Justice Division.
Section 3. The City Council hereby designates and appoints the Mayor of said City as
the authorized official to apply for, accept, reject, alter, or terminate the grant on behalf of the City.
PASSED, APPROVED AND RESOLVED on this 3rd day of February, 2020.
ATTEST:
•.F FRI
A��cNO�•
r V O.
Melinda Welsh, TRMC O
City Secretary • Nam'
OFTEN.
Grant Number: 1406219
R2020-01 2
CITY OF FRIENDSWOOD
DESIGN CRITERIA MANUAL
DEPARTMENT OF ENGINEERING
a
�r t
11%
JILDARDO ARIAS, PE, CFM
DIRECTOR OF ENGINEERING
APPROVED BY
RESOLUTION NO. R2021-01
JANUARY 2021
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
Changes in the 2021 revision of the CAN, of Friendswood Design Criteria Manual shall be listed
here by Section.
Changes to Section I — Graphic and Design Requirements: NONE
Changes to Section II — Wastewater Collection System Design Requirements:
1 04.F 4 — Delete TIT and replace with III 10-f.B -f
1 04.F 16 — Delete SDR 26 and replace with SDR 26Pi C PiPe (ASTAI D 1014 latest
edition)
1 04.J.2.d.5.b — Delete (.1TSAl' and replace with 1STAI
Changes to Section III — Water Line Distribution System Design Requirements:
1 02.G — Delete 'uv-u,,fi-ienclsu,00cl.com publications and replace with
'u'u'u,.cz,fi-zenclsu,00cl.t.its 150Pit h1ications-Forms
1 04.B.3 — Delete as in the follouring sections and replace with as in Section II —
ii"asteurater Collection SJ•stem Design Reclun-ements
1 04.B.4 a — Insert Refer to Section II — ii"asteurater Collection System Design
Requirement. after shall be located above the seiner
1 04.B.4.b —Delete long)] and replace with long)]
1 04.F 1 — Delete this subsection.
1 04.F.2 — Update outline numbering sequence to 1 04.F Stream Ditch Crossings.
1 04.F Lb — Delete Elevated crossings are Preferred rather than underground
crossings. and replace with Underground crossings via bored pohvethilene pipe
Preferred to elevated crossings.
1 04.N 1 a — Insert to create a physical loop after subdivision
1 04.N Lb — Delete this subsection.
1 04.N l.c — Update outline numbering sequence to 1 04 'v 1 h
1 04.N l.d — Delete this subsection.
1 04.N l.e — Update outline numbering sequence to 1 04 'v l.c
Revised ol'11 2o2l Revision Changes Page I of 20
City of Friendswood Design Criteria Nlanual
Engineering Department Changes to this revision
1 04.N If — Update outline numbering sequence to 1 04 'v 1 d
1 04.N l.g — Delete In an unavoidable and replace with Dead -ends shall be avoided
irlienever Possible; In an unavoidable and update outline numbering sequence to
1 04 'v 1 e
104.0 3.b — Delete hrenti (20) foot section of C 900 PTV Pipe [One hunched f fti
(150) Psi and replace with eighteen (1 �) foot section of class 150Pipe
1 05.D.2.a —Delete and l h
1 05.D 5 — Insert fie of specified tiPe after Pressure,
1 05.E.1 — Insert Refer to Cih Standard Details for additional requirements. after
construction plans.
1 06.G —Delete this subsection.
1 06.H —Update outline numbering sequence to 1 06.G
2.02.A — Insert Ahninium pipe size is '� and replace with 10 also being common.
Changes to Section IV — Street Paving:
1 02.E — Delete 'u,u,u,,fi-ienclsu,00cl.coin publications and replace with
'u'u'u,.cz,fi-zenclsu,00cl.h.its 150Pit h1ications-Forms
1 04.A.2 — Insert 'The 11Ialor Thorough Plan min fie found at
innrxifii-zendsirood.h.its 150Publications-Forms. after additional considerations.
1 04.13.5 — Delete but not less than suti (60) feet and replace with no less than suti
(60) feet
1 04.0 1 a —Delete a fc and replace with an fc Delete ('000psi, reinforcement
and replace with four thousand (-f 000) psi. Reinforcement Delete bars shall be
spaced' and replace with bars, spaced' Delete eighteen (1 �) and replace with
hrent four (4) Delete sixteen (60) and replace with forte (40) Delete
hrelve (12) and replace with ten (10)
1 04.C.2.a —Delete fc — ; 000 psi and reinforcement and replace with an fc equal to
four thousand (-f 000) psi. Reinforcement Delete bars shall be spaced and replace
with bars, spaced Delete eighteen (1 �) and replace with hrent four (4)
Delete suh (60) and replace with forte (40) Delete hrelve (12) and replace
with ten (10)
Revised ol'1l'_'n_l Revision Changes Page 2 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
104 J 8 — Delete `#5 reinforcing bars and replace with smooth dowel bars Insert
Concrete slab thickness shall be at least matching the existing slab thickness, and be a
high strength early yield with fc — 5 000 psi after unless otherwise specified
2 01 — Delete "Reserved from the section title and insert the following subsection
A `Vesearch existing utility and right of way information
B Verify that no restrictions exist that will deny approval of the project
concept "
Changes to Section V — Storm Drainage
102 C — Insert the latest version after Manual
102 D — Delete Design Criteria Manual Ordinance No T2007 20 amends the Flood
Damage Prevention Ordinance by adopting the Harris County floodplain maps as
revised on June 18 2007 and replace with Hydrology and Hydraulics Guidance
Manual Updated June 2019
102E—Delete Bridge Division and insert Design after Hydraulic
1 02 F — Delete National Weather Service Documents — TP 40 Rainfall Frequency Atlas
of the United States and replace with Atlas 14 Rainfall Depths for Galveston County
Consolidated Drainage District 1012019
102 — Insert the following subsection
H "Harris County Flood Control District Policy Criteria and Procedure Manual
Includes Revisions to Chapters 2 3 6 7 & 8 from Interim Guidelines and
Criterza forAtlas 14 Implementation revised July 2019
I Harris County Recommendation on Minimum Standards for Communities in
Harris County and Draining to Harris County May 12, 2020
J National Oceanic and Atmospheric Administration (NOAA) Atlas 14
Precipitation —Frequency Atlas of the United States Volume 11 Version 2 0
Texas (Atlas 14)
K "Kronkosky Blake Gauge Engineering Atlas 14 Rainfall Depths for Galveston
County Consolidated Drainage District, October 2019
L Federal Emergency Management Agency Flood Insurance Study Galveston
County Texas and Incorporated areas August 15 2019 "
Revised O1/11/2021 Revision Changes Page 3 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
103 A — Insert or other drainage facilities entering their system after ponds
103 C — Delete 1 change in land use that alters the impervious coverage of the tract of
land. Impervious comer includes, but is not limited to concrete, asphalt, stabilized soil,
temps courts, water features, pools, smdeuralks, crushed concrete, limestone, and
roofing and replace with am mannmade change in improved and unimproved real
estate, including, but not Imutecl to buildings or other structures, mining, dredging,
filling, gracing, pining, excavation or drilling operations.
1 03.E — Insert In order to meet this requirement all standards in the Harris Counti
Recommendation on 1llmmmum Standards for Communities in Harris Counti and
Draining to Harris Counti letter releasedAlai 12, 2020 must be met. after Section.
1 03.N — Delete ii eather Service and replace with Oceanic and ltmosphermc
lchmmstratmon Insert 'The Cite uses the Atlas 14 Point Precipitation rainfall depths.
after lchmmstratmon
103 O — Insert Engineering Department after Public ii"orks Department, Insert
(when clei,elopmment occurs within (3ah,eston Counti) after Drainage District
1 04.A — Insert based on Atlas 14-point ranfall after f-equenemes Delete 'Corti of
Frmendsirood, Galveston Counti Consolidated Drainage District, and Harris Counts
Flood Control District and replace with National Oceanic and ltmosphermc
lchmmstratmon for Harris Counti Region III' Insert * 111 Corti or District maintained
facilities shall be designed for the 100-rear storm independent of the amount of acreage
served. after the Tvpe of Facilitv and Frequency list.
1 04.B.2 — Insert 11loirable before i alues Delete tipmcalh used inn and replace
with for Replace Ranfall lntensmti 11loirable i alues Parameters chart irmth updated
chart
t, — 60 min
Rainfall
Fre uene y
b
d
e
3-vear
51.4
8.1
0.705
5-vear
46.6
70
0.656
10-vear
51.9
6 5
0.647
25-vear
61.5
64
0.644
50-vear
67.9
61
0.640
100-vear
76.2
6.2
0.641
t, 60 min
Rainfall
Revised ol'1l'_'n_l Revision Changes Page 4 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
Fre uenc
b
d
e
3-vear
69.9
11.9
0.768
5-vear
86.1
194
0.775
10-vear
1103
30.9
0.776
25-vear
1540
475
0.783
50-vear
211 5
677
0.798
100-vear
318.6
960
0.826
1 04.B.3 — Replace Land L se Tine and Run-off Coefficient chart irith updated chart
Land Use Type
Run-off Coefficient
Raw Undeveloped Acres
0.20
Improved Undeveloped Acres
(i.e. mowed, filled, re -graded, etc.)
0.30
Parkland
0.40
Residential.
SFR Estates = 1 acre
0.45
SFR 1 acre
0.55
0.85
-Xlulti-family
Industrial
0.90
-Commercial
Pond detention and atnenity
1.00
1 04.D 6 — Insert For developments less than f tie (5) acres, shoir contours of acllacent
properties irithin ffti (50) feet, and account for natural and existing overland f7oir or
channeli_ed floirs. Contour lines shall provide an indication on whether or not acllacent
off site areas cb-mn toward or away f -om the suh7ect tract. after channeli_ed flows.
1 04.E.3 — Delete BridgeDivision Insert '� in front of -f
1 04.H.2 — Delete one hundred (100) and replace with f fh (50)
1 04 H.?.a — Delete one hundred (100) and replace with f fh (50)
1 04.H.2.a.3 — Delete five -tenths (0 5) and replace with f fh -fine hundredths ( 55)
104.H.2.a.4 — Delete No Delete shall apph and replace with of ffh-fine
hundredths (0 55) ac. ft per acre.
1 04.H.2.a.6 — Insert the following subsection:
6) Single fanuh residential and accesson buildings on existing lots and
developments under one (1) acre do not have a nummum detention
requirement.
Revised ol'1l'_'n_l Revision Changes Page 5 of 20
City of Friendswood Design Criteria Nlanual
Engineering Department Changes to this revision
1 04.H.2.d — Delete one hundred (100) and replace with f fh (50)
1 04.H.2.e — Insert the following subsection:
e. 'Triangular Hvd rograph lllethodl for projects f fh (50) acres or less
The volume of storage required min be computed as follows.
B _ 43560 V
0.5 I
S _ 0.5 B (I—O)
43560
ii'here,
B — Duration of inflow (sec)
i — Total infloir volume in ac ft (4 hr duration even use SCS Curve
Number)
S — Required storage volume (ac ft)
I — Peak inflow rate (cfs)
0 — Peak outflow rate (cfs)
1 04.H.2.17— Insert the following subsection.
f 'Unit Hvdrograph 1llethodl (Small ii"atershedl 1llethodl) min be used for
Projects with drainage areas hehreen 0 acres and 100 acres a technique
developed hi Dr H.R. Alalcom mqJ be utilm_edl in determining mnfloi,
hydrographs. The maxmuam inflow rate shall be determined hi use of the
rational formula. ii5th the Peak flow and volume of runoff the equations
Presented below min be used to determine the inflow hydrograph for the
Proposed detention facilmh
The maximum allowable outflow rate ftom the dletentmon facilmh shall be
restricted to the existing flow rate from the undeveloped tract. Outflow
control shall be designed for the s-rear 25-rear and 100-rear storm
f-equencmes. In cases inhere the outfall for the detention facilmh is to be all
existing roadside ditch, storm sewer etc. the allowable outfloi, rate maj
need to be restricted to less than the maximum allowable so as to no
overload the outfall
v
1 Tp = 1.39 Qy
ii'here,
Tp — Time to peak in seconds
V — Total volume of runoff for the design storm (ft3)
Revised ol'1l'_'n_l Revision Changes Page 6 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
Qp — Peak runoff for the design storm (cfs)
V = Dr A* r43,560)
l 12
ii"here
Dr —Runoff Depth (m)
A — RunoffArea (acres)
2. qi = 2 11- Cos !1 [ti <— 1.25 Tp]
P
*'vote: The argument of the cosine finction shown above
must be expressed in radians.
ii'here,
t; — Time oflnterest (sec)
q, — Runoff at Time oflnterest (cfs)
-13C,
' q[ = 4.34Qpe ry
[t; > 1.25TJ
*'vote: The argument of the cosine finction shown above
must be expressed in radians.
4 T — zy — Time Internal
10
1 04.H.3 — Delete 'The Triangular Hvdrograph 1llethod maj be used, or and replace
with Detention Storagelllethodologj forProlects over 50 acres.
For drainage areas over 50 acres, a detailed hrch-milic anahsis utilizing the effectrne
FEt1L4 models irill use as a minimum HEC Ht1IS 1, 1.2 and HEC-R4S i, 1 0 (or more
current version) for irindoirs. This methodologj also applies to properties out of tracts
of 50 acres or more. 4 Drainage Impact Assessment report irill be required to detail all
design assumptions and parameters.
1 04.H.3 — Insert the following subsections.
a. ii"atershed Alocle1mg Aletlioclologj
1 FOTHEC-Ht1IS watershed anah•sis, the following parameters shall be
used.
Losslllethod: iireenand 4mpt
Transform Alethod. Clark I ni t Hrdrograph
Revised of '11 2o2l Revision Changes Page 7 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
Initial Loss. 0.1 Inches
11loistureDefucut- 0.185
Suction. 12.45 inches
Conductnnti 0.024inches hour
Percent Impervious Cover
Land Use
Percent Impervious °o
[Eater
100
Isolated Transportation
90
High Densu 0
1�5
Light Industrial
60
41r ort
50
Residential Small Lot
40
Residential Large Lot
20
Development Green 4cres
15
Residential Rural Lot
5
1'ndlevelo ed
0
1 nk71own
0
Atlas 14 Annual Exceedance Probability Rainfall Data (Inches) Region Ill
Duration
1-Fear
5-Fear
10-Fear
?5-Fear
100-Fear
5-111117
0.-
0 1�
0.9
1 1
1 -f
15-nun
1 -f
1 50
1 1�
2.1
? -
10-lltnl
2.0
? 5
10
1
1-hr
2.6
2.9
1 -f
41
5
2-hr
;;
;
-{ 5
56
- 5
6-hr
-f 5
52
6. 5
� 4
12.2
12-hr
5 1
62
-
10?
150
2-f-hr
6.2
- 1
9?
12.1
1- 9
2. Indicate on a map drawn to scale the existing andproposed watershed
areas. 411 malor features such as malor roads and drainage entries
shall be indicated. 'rode locations shall be provided in the base model
with corresponding nodes at identical points in the model for the
proposed system.
1 The model shall include the 5-rear 25-rear and 100-rear pre
development and post development runoff analvsus. If a proposed
development is to be constructed in phases, the analvsus should
address anj intermediate developed conditions.
Revised ol'1l'_'n_l Revision Changes Page 8 of 20
City of Friendswood Design Criteria Manual
Engineering Department Changes to this revision
-f ii'hen time series clata or Pared clata are used in the model, hruefh
discuss the source of the clata in the report or show the calculations.
ii'henever possible, provide a cope of the calculations, source and
model files via file sharing or on an external thumb chive.
s Time of concentration and storage coefficients shall be calculated as
outlined in HCFCD and (3CCDD methodologj
6. If a chfferent model than the ML4 effective hrch-aurluc model is
utilized, written justification must be provided, and approval granted
by the Cute prior to beginning 4t a minimum HEC-Ht1IS v 1.2 shall be
used.
h ii"aterSurfaceProfile11loclelmg
1 ii"ater surface profile models shall be created using as a minimum
HEC-R4S v ; 1 ; (or more current version) for uinclows.
41ternatuve approaches to modeling shall be discussed with the Cute
prior to commencing the stuck
?. The use of one-clmuensuonal steaclj flour a d unsteach flour approach
min be utilized with proper7usti,ficatuon.
Provide information and clata for the base model which must be
included in the report If the base model is different than the FEIL4
effective model, written justification must be provided, and approval
granted before modeling commences. Base models shall be updated
using HEC-R4S v ; 1 ; (or more current version)
-f Provide a plan view schematic for the existing and proposed
systems. The schematics shall indicate channel designations, node
labels and river stations. The river stations and node label so the
existing model shall match am identical points on the proposed
models whenever possible. Physical reference points shall also be
used.
s 411 models shall include the s-rear 25-rear and 100-rear pre
development and post development runoff analysis. If a proposed
development is to be constructed in phases, the analysis should
address anj intermediate development conditions. Proposed bridge
and or culvert crossing anahses shall include an extreme event
Revised ol'1l'_'n_l Revision Changes Page 9 of 20
City of Friendswood Design Criteria Manual
Engineering Department Changes to this revision
6. For anj steach four or unsteach four data used in the model(s)
hruefli explain hoer the data was calculated or the source of the data.
ii'henever available, these separate data fles or calculations shall
be included on the required external thumb drive and 'file share
transfer with all submittals.
111 existing bridge or culvert crossing shall be modeled based upon
actual on the ground survej data correcth tied to a GCCDD or
HCFCD benchmark, datum and rear of aalustment unless otherwise
authorized.
Bridge and or culvert crossing shall be anah_ed using the highest
energj answer obtained using the energj and momentum equations.
9 The model should include a reasonable number of cross sections
based upon current elevation data to ensure that the actual drainage
system is properh represented. The spacing of cross sections min be
approximated hi using Samuel s equation. The use of numerous
unteupolated sections hehreen hro surveyed cross sections that are
too far apart is not an acceptable wai of producing additional cross
sections.
10. Some portions of channels within the Cut are tudalli influenced In
those reaches, the models shall account for tidal conditions.
11 ForHEC-R1S models, the following contraction and expansion
Coefficients are required. 1m variance from these values must be
preapproved hi the Cut
Contraction Coefficient 01
Expansion Coefficient- 0.1
12. 11Ian ing s n values frill follow GCCDD design criteria on the
Galveston Count side and Harris Count criteria on the Harris
Count side. See the latest versions of the GCCDD Drainage
Criteria Alanual and the HCFCD Poluci Criteria, and Procedure
Alanual 1nj deviation from these n values must be approved hi
the Cut before modeling begins.
1 04.H.4 — Delete 'The I nutHvdrographlllethocl maj be used.
For developments with more than one hundred (100) acres, a detailed
hrch•ologuc analysis utilizing the HEC 1 orHEC HIiISFlood Hvdrograph
method shall be required per the applicable governing entities.
Revised ol'11 2o2l Revision Changes Page I of _o
City of Friendswood
Engineering Department
104 H 5 — Update outline numbering sequence to 104 H 4
104.116 —Update outline numbering sequence to "1 04.H 5
104 H 7 — Update outline numbering sequence to 104 H 6"
104 H 7 — Insert the following subsection
Design Criteria Manual
Changes to this revision
c "Contact the Galveston County Consolidated Drainage District for the
latest regional detention rates
1 04.H 8 —Update outline numbering sequence to "1 04.H 7'
104 H.9 —Update outline numbering sequence to I"1 04 H 8"
104 H 8 — Replace Detention Requirements Summary with updated chart
Off Site
Engineered
Detention
Attachment
GCCDD
F
7Acreage
Detention
Drainage
Volume
Rates
#4*
Board
Available
Plans
Calcation
Required
Approval
Method
Purchase
Regional
Detention
Based On
Not
New
Contact
Not
0 5
Yes
Required
Impervious
GCCDD
Yes
Required
Coverage
for fees
Calculation of
Detention
SFR
Volume
Unnecessary
Engineer
Determines
Contact
5 8
Yes
Required
the Detention
GCCDD
No
Required
Volume by an
for fees
Approved
Method
8+
No
Required
Engineer On
NA
No
Required
Site Detention
Revised O1/11/2021 Revision Changes Page 11 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
Engineer
Determines
Contact
0-5
I es
Required
the Detention
GCCDD
No
Required
1\IFR
N olume by an
for fees
Approved
Method
5+
No
Required
Engineer On-
NA
No
Required
Site Detention
Engineer
Determines
Contact
0-5
I es
Required
the Detention
GCCDD
No
Required
COO
N olume by an
for fees
Approved
Method
5+
No
Required
Engineer On-
NA
No
Required
Site Detention
1 04.H.10 —Update outline numbering sequence to I" 1 04.H.9'
1 04.H.9 — Insert the following subsection.
d. Hvdrograph timing as a substitute for detention on anj project is
prohibited.
1 04.H.10 — Insert the following subsection.
10 LourestFloorElevation.
a. Refer to the Ceti ofFriendsirood Flood Ordinance (December
2020) section ;4-6_ for special Ioirest floor elevation
on
requirements.
h The latest FE11 L 1 FIRPI panel and Flood Insurance Stuch (FIS)
should be referred to for the base flood elevation and the 0?
Percent flood elevation.
105 — Delete RESERiED and replace with C(JIIIPUTER HODELS 4 D
PRO(3R4t1IS
105 — Insert the following subsections.
A. 'Current effective models use the HEC-Ht1IS and HEC-R1S computer
programs. Gmclance for applving these programs is in the HCFCD Hvdrologj
Revised ol'11'2o2l Revision Changes Page 12 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
and Hi'draidics (3mclance Alanual and the Galveston Counts Consolidated.
Drainage District Criteria 1lmnual. The current effective FE1 LA model must
be used. Am departure f tom using this model must be submitted in written
format and approved hi the Ceti prior to submittal.
B In some cases, HEC-Ht1IS and HEC-RAS cannot accurateh model some
Protects or hydraulic conditions. Alternative models min be used onh with
consent hi the Ceti s Engineering Department. 411 models selected must be
fteeware or prepared in a form such that the Engineering Department call
open and review the models. The Engineering Department must be notified in
writing of the program that will be used with justification earh in the design
process.
C 411 models must be accompanied hi a Letter Report or Drainage Impact
Assessment describing am assumptions and changes clue to the protect. 411
protects linger than 50 acres required a Drainage Impact Assessment
106 — hisert subsection title A. Drainage Plan Submittals
1 06.A — Update outline numbering sequence to 1 06. 4.1 Preliminan Submittals —
Suhmut forReineu' mid Comument-
1 06.A.1 —Update outline numbering sequence to 1 06. A.1.a — (Jne line clrairings are
required as part of the platting process. One line drawings shall include:
106.13 — Update outline numbering sequence to 1 06. A.? — Final Design — Submit the
following for approval
a. Copies of am documents which show approval of exceptions to the Ceti
Design Criteria.
h Design calculations for storm line sizes and grades, and for detention
facilities, ifam
c. Design calculations for the hydraulic grade line of each line or ditch, and for
detention facilities, ifam
d. Contour map and drainage area map of the protect.
e. Plan and profile sheets showing storm seiner or open ditch design (public
facilities onh )
Revised ol'11 2o2l Revision Changes Page 13 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
f Protects located urmthin a, loodlplmn boundan or urmthmn a floodplain
management area shall shoir the floodplain houndlan or floodplain area, as
appropriate, on the one -line drairmng or drainage area map
g Soil boring logs.
h. 111 dranage plans shall have a currentFE1L1, loodl _one
determination statement
m. Fill calculations are requmredl for protects located in the FEtlL1, loodhrm 100-
vear floodplain and the 500-rear, loodlplan.
1 06.0 — Update outline numbering sequence to 1 06. 1. — Signature State — Submit the
following for approval
a. Revieir prints.
h Original drairings.
c. Storm crater detention maintenance agreement letters.
106 — hisert the following subsection.
1. National Flood Insurance Program (. FIP)Compliance
1 The Cmh ofFrmendlstroodl is a participant in the IVatmonal Flood Insurance
program s (NFIP s) Comumunmh Rating System (CRS) 1s a CRS comumunmh
the Cmh is required to develop and implement various programs intended to
reduce flood risk such as mdlenti, •mng drainage problem areas, maintenance of
existing drainage sistems, construction of drainage protects, outreach to the
communmh etc. 1s a result of the commumh s commitment to reduce the
flood risk, the residents of the Cat are entitled to receive discounted flood
insurance prenuums based on the Cmh s CRS ranking as evaluated hi CRS.
2. 111 runoff impacts created hi development shall be mitigated, so post -
protect runoff rates and flooding levels are equal to or less than equivalent
pre -protect conditions.
Fill placed in the floodhraj 100-rear f7oodplamn, or 500-rear f7oodplamn as
designated on the current Flood Insurance Rate Illap and beloir the 500-rear
flood elevation shall be mitigated hi the removal of a like amount of
compensating cut in the vmcmnmh of the fill, irlide maintaining hydraudmc
connectnnh to the existing floodplamn.
Revised of '11 2o2l Revision Changes Page 14 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
4 1m neu• development in the floochrai will require a No Ruse stiuh 111
calculations and or models must be submitted irith No Ruse stuck via the
CM s permitting process.
106 — hisert the following subsection.
B DranageReportDranagelmmpact lssessmmentRequuremments
Drmmcige Report Drcnnnge Inmpnet.Innlrsus must be approved prior to subnuttnl and
npprorcd ofConstiuctuon Plcnas. The clrcnnnge report nmuust nacliicle nmmmmrnuam of the
following items listed in the ch cnnnge report
1 Executive Sunamnrr To include detention sunamnrr table for protects truth
detention.
2. Introduction. Inclusion of protect name nrnl puupose map nrnl description Of
protect limits, protect obtectnves, nssunmptuons cord constrcnnts cord nnr existing prior
studies. .Inr clam awed nmuust be fadlr clescrubecl.
Existing Conditions. Include Iocntuon nrnl topogrnphv Innd uuse FULI
floodpinms, right-of-ircn• pipelines cord utilities, surrey dcrtaina, brief discussion of
impact of hustorucnl storm events nt the protect site Incliicle cnad E.nstung Conclmtuon
Drcnnnge.IrenAlnp E.Yhibut.
4 Hvchologr cord Hvchnulucs. Include Design Criteria gtudelmes used, storm
fuequeneues cmcdrfed, nutugntuon requirements etc. Include n listing ofprogrnms and
sofhrnre used Include discussion of the hydrologic cord hvch•nuluc methodologies
uused. Include Pre -Protect cord Post -Protect conditions. For protects that trill be
built in n phased cippronch include nn Interim condition. Include nncdtsus of nn
ectreme erent. E.clmmbmts trill mmchucle orercdl Drcmmcige.IrenAlnp, E.nstung Drcmmcige
Area Alnp truth 5 25 100-recn flotrs cnad irnter suufnce elercrtmoms ntAlntor Omutfcdl
Nocles, E.ctrenme Conclmtuon Alnp- Flooclplcnn Alnps truth protect bomumcicn r
5 Proposed Drmmcige Plan. Inclmucle n clescruptuon of the proposed clrcnnnge plcmm,
results of the hvchologmecd cord hvchnulucs cmcdtses, channel cord or detention Inrout,
right-of-trcn• requirements, pipeline cord utmlfi• conflicts, geotechmecd requirements,
cnd car enrmronmentcd issues. Exhibits required include Overcdl Drcnnnge Area
Mcip, Proposed Drcnnnge.IrenAlnp truth 5 25 nrnl 100 vecn flogs cnd hater suufnce
elerntuons ntHntor Oulfcdl Nodes, Floodplcnn Mcips truth protect boundaries shotrn,
Detention Pond Iarout truth detention summnry cnd Plan cnd Profile truth 5-rear
25-rear cnd 100-rear truster suufnce elercrtmons in ease of ronchrcn•
6. Fu11 Results. Include fill calculations for the floochrcn• 100-rear floodplcnn cnd the
500-rear floodplcmn cnd a discussion of car mmtigcrtmon. Include a Fu11 Exhibit
shotrmg till areas of taut cad fill.
Conclusions.
Revised ol'11'2o2l Revision Changes Page 15 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
ii'hen a detention facihh• is part of the proposed prolect, include the following
detention summary table
Project Name
Detention Basin Area
Acres
Detention Storage Rate
Acres-Feet/Acre
Detention Storage Required
Acre -Feet
Detention Storage Provided
Acre -Feet
Floodplain Fill Mitigation
Volume
Acre -Feet
Storm Event
20% (5 Yr)
10% (25-Year)
1 % (100-Year)
Pond Maximums
Design Water Surface
Elevation (- -Datum,
Adjustment)
Maximum Allowable
Outflow 9cfs)
Maximum Outflow Provided
(cfs)
e 1ppenchx. Include detailed livulrological and hydraulic calculations.
Include models and Geospatial data on an external drive.
107 — Delete and' before all design and replace with a comma. Insert and anj
submitted reports after calculations Insert 111 hydrologic and livulrmdic calculations
and or models used chiring design must be submitted to the Cal via electronic transfer and on an
external hard drive. after information.
2.02 — Insert the following subsection.
F 111 projects located in the floochrm 100-rear floodplain, or 500-rear
f7ooclplain require f ll calculations and fill exhibit indicating areas of fill and
cut.
Changes to Section VI — Site Development:
1 02.0 — Delete 'innr fi-iendswood. com publications and replace with
'u'u'u,.cz,fi-zenclsu,00cl.h.its 150Pit blications-Forms
Revised of '11 2o2l Revision Changes Page 16 of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
1 04.A.2.d.2.g - _add a line spacing after subsection g Once the site plan is approved,
the developer min begin the building permitting process. 4pproval ftom the appropriate
drainage entiti is required prior to the issuance of building permits.
1 04.A.2.d.4 - Delete set out in the and replace with set out in Section III -
1 04.A.2.d.5 -Delete refer to the and replace with refer to Section II-
1 04.A.2.d.6 - Insert Refer to Section i - Storm Drainage Design Requirements for
more details. after facilities in the area.
1 04.A.2.d.7 O 1 - _add a line spacing after subsection '13) Ten (10) feet on collector
streets, major thoroughfares and boulevards, and local streets greater than hrenti-eight
(28) feet in iridth.
1 04.A.2.d.1 La - Delete Concrete pavement thickness shall be a minimum of fine (5)
inches irith eight ('�) inches of stabilized suhgrade. Reinforcement shall be Cn-ade 60 6
- 60 000 psi, TF4 deformed reinforcing bars spaced at sixteen (16) inches center to center
both trays and a minimum lap lengths of eighteen (1 '�) inches. and replace with
11limmum concrete slab thickness shall be five (5) inches irith an fc equal to four
thousand (-f 000) psi. Reinforcement shall be Cn-ade 60 6 - 60,000 psi 74
deformed reinforcing bars, spaced at sixteen (16) inches center to center both 1rays
irith a minimum lap length of tirenti-for (4) inches. Ahninium stabilized suhgrade
thickness shall be eight ('�) inches.
1 04.A.2.d.1l.f - Delete 4ppenchx C - Design Criteria 1llanual and replace with
1ppenchx C of this Design Criteria 1llanual
12.03 J - Delete 'Concrete sideiralks [a minimum of four (4) feet iride and four (4)
inches thick irith steel reinforcement] shall be required along all street f ontages. and
replace with Sideiralks are required as set out in Section III of the Subdivision
Ordinance and Section -0-64 of the Code of Ordinances. ii'here sideiralks are
required, the] shall have a minimum iridth of four (4) feet except on TxDOT rights-
of-irai inhere the minimum iridth shall befive (5),feet.
Changes to Appendix A - Attachments: NONE
Changes to Appendix B - Figures: NONE
Changes to Appendix C- Parking Group Tables: NONE
Changes to Appendix D - Qualified Tree List: NONE
Changes to Appendix E - Downtown District Amenities: NONE
Revised of '11 2o2l Revision Changes Page 17 of 20
City of Friendswood Design Criteria Manual
Engineering Department Changes to this revision
Changes to Appendix F — Culverts and Driveways Police
IILA.vii — _add a line spacing after subsection wi. 11ternate sizes and styles maj be
used as long as thej meter the same square inch area of the required pipe size, and is
approved hi the Ceti Engineer
III.B.si — Delete 'u-uv f-ienclsu,00cl.com publications and replace with
'u'u'u,.cz,fi-zenclsu,00cl.t.its 150Pit filications-Forms
Changes to Appendix G — Traffic Control Sign Police
Header of document — Delete Engineering Department of Public [Forks and replace
with EngineeringDepartment
TABLE OF CONTENTS ATTACHMENTS.F —Delete 12 and replace with 11
SCOPE — Delete Engineering Department of Public [Forks and replace with
Engineering Department
TERMS.Traffic Committee — Delete Department of Public [forks lchmmstration and
Public [forks Engineering Division and replace with the Public [forks Department
aiid Engineering Department
PROCEDURES 1 —Delete 'Traffic Concern re nest forms min be obtained from the
Cat ofFrzenclsu,00d Engineering or clou,nloacled at
uv-u,,f-zenclsu,00cl.coin pufilications. and replace with 'Trafc concerns min be
submitted chrecth to Engineering via a f Ilable form at
innr.ci,fi-iendsirood.t.its 1sOPublications-Formsunder Traffic.
PROCEDURES.2 —Delete Public [Forks and replace with Engineering
PROCEDURES 7 —Delete irill share and replace with shall attempt to convej
No Parking,' Parking Zone Implementation Requests — Delete iri11 share and replace
with shall attempt to convej
No Parking, 'Parking Zone Removal Requests — Delete iri11 share and replace with
shall attempt to convej
Commercial Truck Cut Through Traffic Mitigation Requests — Delete it'll/ share and
replace with shall attempt to convej
Pedestrian Facilitv Requests — Delete iri11 share and replace with shall attempt to
convej
Revised ol'11 2o2l Revision Changes Page IS of 20
City of Friendswood
Engineering Department
Design Criteria Manual
Changes to this revision
School Zone Safetv Requests — Delete 'Traffic Engineering and Operations it'll/ share
and replace with Engineering shall attempt to convej
Speed Control Requests — Delete 'uv-u,,fi-ienclsu,00cl.com and replace with
uvv,.cz,fi-zenclsu,00cl.tx.us Delete 'Traffic Engineering and Operations irill share
and replace with Engineering shall attempt to convej
Intersection Control Requests (Multi-wav Stops. Traffic Signals, and Roundabouts) —
Delete 'Cih Traffic Engineer and replace with Cat Tragic Director Delete
'Traffic Engineering and Operations irill share and replace with Engineering shall
attempt to convej
Other Public Safetv and Traffic Issue Requests — Delete 'Traf c Engineering and
Operations hill share and replace with Engineering shall attempt to convej
_attachment B.Possible Solutions — Delete and sending it to the Engineering Division
and replace with at invir.ci,fi-zendsirood.t.its 15OPublications-Forms Delete
EngineeringDivision and replace with Engineering
_attachment D.II.Parking Regulations — Delete Department of Public [forks and
replacewith EngineeringDepartment
_attachment F.III.Purpose —Delete Engineering Dnnsion of the Department ofPufilzc
[Forks and replace with Engineering Department at
invir.ci,fi-zendsirood.t.its 15OPublications-Forms
_attachment G — Delete Department ofPuhhc [Forks and replace with Engineering
Department Delete 'The Department ofPufilzc [F"orks hill Install and replace with
'The Cat irill Install
_attachment H —Delete speecls cloirn, Engineering Stitches and replace with speeds
doirn, engineering studies
Changes to Appendix H — Streetlight Police
VT.b — _add a line spacing after subsection Spacing in rural areas that have large
acreage lots min be extended to five hunched (500) foot spacing and staggered along
both sides of the roachrm
VTI.a — Delete Department of Public [Forks Engineering Division and replace with
EngmeeringDepm-tbnentatuvv,.cz,fi-zenclsu,00cl.tx.its 150Pit hhcations-Forms
VTI.b — Delete Division
Revised of '11 2o2l Revision Changes Page 19 of 20
City of Friendswood
Engineering Department
VII.c — Delete Division
Design Criteria Manual
Changes to this revision
VII.e — Delete Division Delete 4pproves and replace with approves
VII.g — Delete Division
VIII — Delete Department of Public [Forks and replace with Public ii"orks
Department
Streetlight Request Form —Delete page titled Streetlight Request Form
Revised ol'1l'_'n_l Revision Changes Page 20 of 20
City of Friendswood
Engineering Department
TABLE OF CONTENTS
REVISION CHANGES
Changes to this revision of the Design Criteria Manual.
I. Graphic and Design Requirements
IL Wastewater Collection Svstem Design Requirements
III. Water Line Distribution Svstem Design Requirements
IN Street Paving Design Requirements
N Storm Drainage Design Requirements
VI. Site Development Requirements
APPENDICES
A. Attachments
Design Criteria Manual
TABLE OF CONTENTS
1 Lift Station Start Up Log
2. Design Criteria Modification Fonn
3 Galveston Countv Consolidated Drainage District Fonn DR-001
(Attachment 4)
B. Figures
1
Geometric Street Design Standards
2.
Divided Roadwav Cross Sections — Urban
3
Roadwav Tapers for Subdivision Streets
4
Undivided Roadwav Cross Sections — Urban
5
Tvpieal Length of Median and Median Opening
Revised o7m1'2o17
TOO
Page 1 of
City of Friendswood
Engineering Department
6 Median Nose and Left Turn Bav Design
7 Cul-de-Sac
8. Drivewav Spacing and Other Measurements
9 Off -Street Parking
C Parking Group Table
D Qualified Tree List
E. Downtown District Atnenities
F Culverts and Driveways Policv
G. Traffic Control Sign Policv
H. Streetlight Policv
Design Criteria Manual
TABLE OF CONTENTS
Revised o7m1'2o17 TOO Page 2 of
City of Friendswood
Engineering Department
1.0 GENERAL
Design Criteria Manual
GRAPHIC AND DESIGN REQUIREMENTS
SECTION I
GRAPHICAND DESIGN REQUIREMENTS
A. Should anv portion of this Section conflict with anv provisions of the Subdivision
Ordinance or Zoning Ordinance, the more stringent of the three (3) shall govern.
B. The Citv Engineer shall have the final interpretation of anv provisions in this
Design Criteria Manual.
C The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
101 CHAPTER INCLUDES
Graphic and design requirements for construction drawings.
102 REFERENCES
The Citv of Friendswood Standard Details and Citv of Friendswood Technical
Specifications, latest versions. These can be downloaded from the Citv s website at:
www.friendswood. convpublications
103 DEFINITIONS
A. CADD (Computer Aided Drafting Design) — the preparation of documents
utilizing computer facilities for the production of drawings, plans, prints, and
other related documents.
B. GCCDD — Galveston Countv Consolidated Drainage District.
C HCFCD — Harris Countv Flood Control District.
D PDF — a file format that provides an electronic image of test or test and graphics
that looks like a printed document and can be viewed, printed and electronically
transmitted.
104 DESIGN REQUIREMENTS
A. Provide a cover sheet for all projects involving three or more design drawings
(excluding standard detail sheets). Drawing sheet numbers shall be shown on the
Revised o2,'18,'2o2o Section Page 1 of 5
City of Friendswood
Engineering Department
Design Criteria Manual
GRAPHIC AND DESIGN REQUIREMENTS
cover sheet or area kev map hnclude a vicinity map to identify project locations.
Also provide current Citv of Friendswood Standard Details Signature Block that
has a note stating that approval is valid for only one (1) vear from the date of
signatures.
B. Preliminary drawings shall be prepared on nominal twenty-four (24) inches by
thirtv-six (36) inches.
C Final drawings shall be produced by CADD on paper stock. The engineer shall
also submit, at the time of plan approval, an electronic PDF and DWG version of
the CADD drawings on CD-ROM of the development showing all lot lines and
associated lot information, rights-of-wav easements, contour -lines, utilities, and
all drainage and paving improvements.
D Details of special structures (not covered by approved standard drawings such as
stream or gully crossings, special manholes, or junction boxes, etc.) shall be
drawn with vertical and horizontal scales equal to each other, and shown on a
separate sheet(s) from the Standard Detail sheets.
E. Each set of construction drawings shall contain paving and utilitv kev drawings
indexing specific plan and profile sheets. Citv of Friendswood Standard Detail
drawings, where applicable, shall be included. All sheets shall have standard title
blocks and be sequentially numbered. Where applicable, show HCFCD or
GCCDD kev drawings and numbers.
F A drawing index shall be shown on the overall cover sheet.
G. Overall project lavouts shall be drawn to a minimum scale of 1 inch = 100 feet
and provided with a drawing index.
H. A north arrow shall be shown on all sheets (except standard or special detail
sheets) and shall be located either toward the top or to the right.
1. Plan and profile sheet stationing must nun from left to right.
J Standard scales pennitted for plans and profiles of paving and utilitv construction
drawings are as follows.
1
2.
Major thoroughfares, major collectors, and boulevards over four hundred
(400) feet in length, or special intersections, situation.
a. 1 inch = 20 feet horizontal. 1 inch = 2 feet vertical
Minor collectors or local streets.
Revised o2,'1 8,'2o2o Section I Page 2 of 5
City of Friendswood
Engineering Department
Design Criteria Manual
GRAPHIC AND DESIGN REQUIREMENTS
a. 1 inch = 20 feet horizontal. 1 inch = 2 feet vertical
b 1 inch = 50 feet horizontal. 1 inch = 5 feet vertical
3 Scales in Paragraph No 2 above are a minimum: larger scales may be
used to show details of construction.
R. Each plan and profile sheet shall have a benchmark elevation and description of
the benchmark, along with a current flood zone determination statement. Also
include the temporary benchmark (TBM) with their elevation and coordinates.
L. The seal, date, and original signature of the Professional Engineer licensed to
practice engineering in the State of Texas, and who is responsible for the
drawings, shall be required on each sheet developed by the engineer, along with
their fine s registration information. The engineer may use a stamped or
embossed imprint for his/her seal: however, the embossed imprint must be shaded
such that it will reproduce on prints.
M. A copy of the final plat for new developments shall be included with the final
drawings when submitted for final approval.
N If a roadway exists where drawings are being prepared to improve or construct
new pavement or a utilitv label the existing roadway width, surface type, and
thickness. Pavement thickness shall be ascertained by coring with the core bole
and grout filled to protect pavement prior to construction.
O Show all street and, or road alignments on drawings.
P End and beginning of alignment shall include coordinates based upon State Plane.
(� Develop drawings to accurate scale showing proposed pavement, typical cross
sections, details, lines and grade, and all existing topography within street rights-
of-wav and anv easement contiguous with the rights-of-wav At the intersection,
the cross street details shall be shown at a sufficient distance [twenty (20) foot
minimum distance outside the primary roadway rights-of-wav] in each direction
along the cross street in order to design adequate street crossings or transitions.
R. Match lines between plan and profile sheets shall not be placed or shown within
cross street intersections including cross street rights-of-wav
S Natural ground profiles shall be shown as follows.
1.
For privately -funded projects, center line profiles are satisfactory except
where a difference of one-half (0 5) foot or more exists from one (1) rights -
Revised o2,'1 8,'2o2o Section I Page 3 of 5
City of Friendswood
Engineering Department
Design Criteria Manual
GRAPHIC AND DESIGN REQUIREMENTS
of-wav or easement line to the other, in which case, dual profiles are
required.
2. For CAN, of Friendswood projects, provide natural ground profiles at each
rights-of-wav line. Easement profiles shall conform to S 1 below
T Basic plan and profile sheets shall contain the following information.
1 Identify all lot lines, propertv lines, easements, and, or rights-of-wav
2. Label each plan sheet as to street, easement widths, pavement widths,
pavement thickness where applicable, tvpe of roadway materials, curbs,
intersection radii, curve data, stationing, existing utilities (type and
location), and anv other pertinent feature affecting design.
3 Show all utilitv lines four (4) inches in diameter or larger within the
rights-of-wav or construction easement in profile view Show all utilitv
lines, regardless of size, including franchise utilitv lines, in the plan view
4 Graphically show flow line elevations and direction of flow for all
existing ditches.
5 Label proposed left and right top of curb elevations and grades, except at
railroad crossings. Centerline elevation and grades are acceptable only for
paving without curb -and -gutters.
6 Curb return elevations and grades for turnouts shall be shown in profile.
7 The centerline elevation at the propertv line of all existing driveways shall
be shown in profile.
8. Station all esplanade noses or the centerline of all esplanade openings with
esplanade width shown, both existing and proposed.
9 The design of both roadways is required on all paving sections with an
esplanade.
10. Station all Points of Curvature (PCs). Points of Tangenev (PTs), radius
returns, and grade change Points of Intersection (PIs) in the plan view
Station all radius returns and grade change Points of Intersection (PIs) in
profile with their respective elevations.
U Provide a Storm Water Pollution Prevention Plan (SWPPP) with legend. See
Section VI — Site Development under Design Requirements.
Revised o2,'1 8,'2o2o Section I Page 4 of 5
City of Friendswood
Engineering Department
Design Criteria Manual
GRAPHIC AND DESIGN REQUIREMENTS
The Drainage Plan shall have a current FENIA flood zone determination
statement.
W All 'No Objection letters expire one (1) vear after issuance.
Revised o2,'1 8,'2o2o Section I Page 5 of 5
City of Friendswood
Engineering Department
SECTION II
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
WASTEWATER C'OLLEC'TION SYSTEM
DESIGN REQUIREMENTS
1.0 GENERAL
A. Should anv portion of this Section conflict with the Subdivision Ordinance or the
Zoning Ordinance, the more stringent of the latter two (2) shall govern.
B. The Citv Engineer shall have the final interpretation of anv provisions in this
Design Criteria Manual.
C The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
D Sanitary sewers located on private propertv that are not in a dedicated easement,
are under the jurisdiction of the International Plumbing Code, as adopted and
amended by ordinance, and will be addressed; reviewed by the Building Official.
101 CHAPTER INCLUDES
Criteria for the design of wastewater collection systems.
102 REFERENCES
A. Texas Commission on Environnnental Qualitv (TCEQ) — 'Design Criteria for
Sewerage Svstems — Texas _administration Code — Chapter 217 (current
revision).
B. Galveston Countv Health Department.
C City of Friendswood Standard Details and Technical Specifications, latest
version. These can be downloaded from www.friendswood.convnublications.
103 DEFINITIONS
Where used in these regulations, the following terns shall be construed to cam, the
meanings given below
Revised ol'11 2o2l Section II Page 1 of_'_'
City of Friendswood
Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
A. Public Sanitary Sewer — A closed conduit which convevs wastewater flow and
which is located within the public rights-of-wav or dedicated public easement. A
public sanitary sewer (or public sewer system) is intended to serve more than one
(1) owner
B. Private Sanitary Sewer — A closed conduit which convevs wastewater flow and is
constructed and maintained by a private entity (ies) (i.e. homeowner's
association). Private sanitary sewers may be located in areas such as a private
street or common area, and are subject to the design and construction
requirements of the International Plumbing Code, as adopted and amended by
ordinance. Private sanitary sewers must discharge to a public sanitary sewer
C Sanitary Sewer Main — A sanitary sewer which receives the flow from one (1) or
more lateral sanitary sewers.
D Lateral Sanitary Sewer — A sanitary sewer running laterallv down a street, allev
or easement, which receives only the flow from the abutting propertv
E. Service Lead — A sanitary sewer which branches off a public sanitary sewer and
extends to the limits of the public rights-of-wav It shall be construed as having
reference to a public sanitary sewer branching off from a main or lateral sanitary
sewer to serve one (1) or more houses, single-fatmily lots, or other tvpes of small
land tracts situated in the same block with the said main or lateral sanitary sewer,
but not directly adjacent thereto. Such a line shall never exceed one hundred fifty
(150) feet in length. If the sanitary sewer is designed to serve more than two (2)
houses, or the equivalent of two single-fatmily residences along a street, a lateral
sanitary sewer as defined above shall be constructed.
F Service Connection — A private sanitary sewer from a single source to the main or
lateral sanitary sewer in the street, allev or easement adjacent thereto Service
connections are covered by the International Plumbing Code, as adopted and
amended by ordinance. It will be owned and maintained by the owner of the
propertv being served by said sanitary sewer
G. Project Area — The area within the immediate vicinity of the public sanitary sewer
to be constructed. For example, if a public sanitary sewer were to be constructed
within the public rights-of-wav the project area would extend ten (10) feet to
either side of the public rights-of-wav If as an example, a public sanitary sewer
is to be constructed within a dedicated easement adjacent to the public rights -of
wav the project area would extend ten (10) feet to either side of the dedicated
easement, depending upon the existing topographical elements, unless impacted
by a permanent structure (i.e. telephone pole, trees, drainage ditches, etc.) If, as
Revised of '11 2o2l Section II Page 2 of 22
City of Friendswood
Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
an example, a public sanitary sewer is to be constructed within a side lot easement
(if approved by the Citv), the same criteria would apply as for a dedicated
easement adjacent to public rights-of-wav
H. Stack — A riser pipe constructed on main or lateral sanitary sewers which are
deeper than six (6) feet, measured from finished grade at manhole to facilitate
construction of service leads or service connections.
L Force Main — A pressure -rated conduit (i.e. ductile iron pipe, pressure -rated PN C
etc.) that conveys wastewater from a pump station to a discharge point.
J All references hereafter to sewer, public sewer, private sewer, sewer main, lateral
sewer, service lead, service connections, stack, and force mains shall mean
elements of a sanitary sewer system.
104 DESIGN REQtJIREMENTS
A. Drawings to be furnished.
Before anv main or lateral sewer is constructed and before a pennit shall be issued
for the construction of sauce, plans and profiles of the proposed sewer shall be
prepared and submitted to the Citv for approval. All reproducible drawings. PDF
and CADD files shall become the propertv of the Citv and shall remain on file in
the Citv for the use of anv person who may be interested in such information.
B. Details to be shown on drawings.
The detailed plan view will show the exact location of public sewer lines in the
street, allev or easement with respect to the edge of the particular rights-of-wav
the sun,ev base line, and anv nearby utilities, major landscaping, and other
structures affecting construction.
C Main and Lateral Sewers
1 Sewers in curved easements, easements defined by propertv lines, and
combined easements containing other public utilities shall be shown both
in detailed plan and profile views.
2. The profile shall show other underground and surface utilities, and
facilities, both in parallel and at crossings, the size, grade of the proposed
line, the elevation of same to hundreds of a foot at all manholes, changes
of grade and dead -ends, and the proposed finished grade over the sewer
Revised of '11 2o2l Section II Page 3 of 22
City of Friendswood
Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
It shall show the actual ground line as it exists prior to construction of the
sewer Where proposed fill or cut is contemplated, the proposed new
ground line shall be shown as a separate line from the actual ground line.
Tvpe of pipe and bedding shall comply with Citv of Friendswood
Technical Specifications and Standard Details.
3 Where public sewers are to be placed between existing pavement and the
street rights-of-wav (or interior easement line) or under existing pavement
or shoulders of pavement, show the existing ground line at both sides (or
the closest side for sewers near the edge) of the rights-of-wav or adjacent
sewer easement.
D Sewer mains — plan and profile required
1 Sanitary sewer lavouts for single-family residential subdivisions should
use a scale of one hundred (100) feet or less per inch. A scale of two
hundred (200) feet per inch may be used provided the following
information is shown on the lavout:
a. All easements containing or buffering sanitary sewers shall have
points of size change shown, and all manhole locations shall be
shown.
b The sewer alignment shall accurately reflect the relative location of
the sewer as shown on the detailed plan view
C. All service leads that cross street pavement or serve adjacent
propertv shall be shown on the lavout. The detail plans and
profiles shall show the flow lines of all service leads at the street or
easement rights-of-wav
d. The number and size of the lots depicted on both the overall sewer
lavout sheet and the individual plan and profile sheets shall match
the number and size of the lots depicted on the final plat after
recordation.
e. On the overall sanitary sewer lavout sheet the size and direction of
flow for all existing and proposed sewers shall be shown.
f. The location of the proposed sewer within the public rights -of
wav a dedicated easement adjacent to the public rights-of-wav or
side lot easement (if allowed by the Citv).
Revised of '11 2o2l Section II Page 4 of 22
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WASTEWATER COLLECTION SYSTEM
g. The overall sanitary sewer lavout sheet shall show the area, in
acres, which the proposed sewer(s) is (are) designed to serve. A
location map shall be included that references the average
proximitv to nearbv major thoroughfare and boulevard streets. The
scale of the location map shall be 1 inch = 2,000 feet or less.
2. Non-residential subdivision sanitary sewer lavouts for large areas, and
with a scale of four hundred (400) feet or more per inch, shall have an
additional set of lavouts at not more than two hundred (200) feet per inch,
with match lines and a small index map showing which portion of the
overall lavout that each sheet's lavout represents.
3 _acceptable horizontal scales for the detailed plan and profile views shall
be ten (10) feet, twenty (20) feet, fortv (40) feet, and not more than fifty
(50) feet maximum per inch. Horizontal scale for major thoroughfares and
boulevards shall be 1 inch = 20 feet or less.
4 _acceptable vertical scales for detailed profile views shall be two (2) feet.
four (4) feet, and not more than five (5) feet maximum per inch unless
otherwise approved. Vertical scale for major thoroughfares and
boulevards shall be 1 inch = 2 feet or less.
5 The plan view shall show at a minimum, the following information for the
project area.
a. All topographical features.
b Stationing for the proposed sewers.
C. All existing underground and overhead utilities (i.e. telephone, gas,
power, etc.):
d. Am, significant landscaping and, or other structures which might
impact construction and, or construction related activities.
e. The width and tvpe of all existing and proposed easements.
f. All proposed service leads.
g. The limits of bore and, or tunnel:
Revised ol'11'2o2l Section II Page 5of22
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
h. Locations where pressure rated pipe is to be installed at water line
crossings.
i. Drawings for single-family residential subdivisions shall show the
proposed location by stations of all service leads, service
connections, and stacks. The distance from the sewer or sun,ev
base line station to the nearest existing manhole shall be shown in
the plan view or on an additional sewer lavout sheet with a scale
no more than 1 inch = 100 feet.
6 The profile view shall show at a minimum, the following information for
the project area.
a. Underground and, or surface utilities; facilities which are either
parallel to the proposed sewer or cross the proposed sewers.
b The proposed sewer's diameter and grade for each manhole
section:
C. The flow line elevation for all sanitary sewers at each manhole:
d. The rim elevation of all existing and proposed manholes,
e. The flow line elevation at each sheet 'break [i.e. from one (1)
sheet to another]:
f. Tvpe of pipe bedding,'backfill shall be noted on each plan,profile
sheet:
g. The finished grade for proposed and existing pavement where
'fill and, or cut' is proposed, the proposed new ground elevation
line shall be shown as a separate line from the existing ground
elevation line:
h. The existing ground elevation line for the 'near side' of the public
rights-of-wav where a sewer is to be placed between the edge of
existing pavement and the edge of the public rights-of-wav
i. The existing ground elevation line at the centerline of the proposed
sanitary sewer where a sanitary sewer is to be placed within an
existing easement:
Revised of '11 2o2l Section II Page 6 of 22
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
j. Show anv proposed and, or existing pavement:
k. The flow line elevation of all service leads where thev cross the
edge of the public rights-of-wav or the dedicated easement
adjacent to the public rights-of-wav
1.
M.
n.
0
E. Service leads
The limits of bore and, or tunnel:
Locations where pressure rated pipe is to be installed at water line
crossings.
The location of special backfill and, or proposed stacks shall be
identified by 'stations indicated on the design plans.
The location of stacks shall be labeled with stations.
1 Service leads shall be sized in accordance with Paragraph 1 04.G of this
Section.
2. Service leads shall be at the propertv line between two (2) adjoining lots,
or as directed by the Citv A single six (6) inch service lead located at the
propertv line between two (2) adjoining lots would serve two (2) single
family residences with a wve placed at the end of the service lead. Do not
extend the wve clean -outs beyond the edge of either the public rights -of
wav or dedicated easement.
3 _illy service lead extension of more than fifty (50) feet parallel to the street
rights-of-wav shall be treated as a lateral sewer
4 Service leads from developments with more than seventeen thousand five
hundred (17 500) gallons-per-dav flow shall discharge into a proposed or
existing manhole. Where the flow line of the service is thirtv (30) inches
or greater above the flow line of the manhole, provide a standard drop to
manhole.
a. Service leads shall be provided to serve each lot within a proposed
development:
b Service leads shall be six (6) inches in diameter (minimum). If the
length of a service lead exceeds one hundred (100) feet or the
Revised ol'11 2o2l Section II Page 7 of 22
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
width of the public rights-of-wav by more than twenty (20) feet,
the minimum diameter shall be eight (8) inches and a matiliole
shall be utilized for connection to the public sewer
C. Service leads with a diameter of six (6) inches shall utilize 'frill
body fitting (extruded or factory -fabricated) for connection to the
proposed public sewer or an approved saddle-tvpe connector for
connection to an existing public sewer
d. Saddle-tvpe connectors shall be installed with the 'stub oriented
between the 'spring line' (3 o clock and 9 o clock positions) and
fortv-five (45) degrees from the 'spring line (' 1 30' and 10-30'
positions). Tees (aka. 'frill body fittings') shall be oriented in the
same manner
e. The service lead shall be designated to minimize the use of bends
as site conditions will penmit:
f. Service leads exceeding the limits defined in 1.04.E.3 shall have a
matilnole at each end: as well as, a platvprofile drawing for each
rights-of-wav crossing. All, or part, of these service leads which
are located in a public rights-of-wav allev or dedicated sanitary
sewer or public utilitv easement may be treated as a public sewer,
depending upon the location of the terminal manhole and anv
intermediate manholes.
g. For all existing lots (which are not served in accordance with these
guidelines) that need a service lead, if the distance to the nearest
existing sewer is less than fifty (50) feet, the service lead falls
under the jurisdiction of the International Plumbing Code, as
adopted and amended by ordinance, and the Building Official.
F General Requirements
1 Sanitary sewers shall allow for orderly expansion of the system and shall
conform to the comprehensive water and sewer plan for the Citv of
Friendswood.
2. Sewers shall be sized based on the minimum requirements set out in this
standard and the standard wastewater flow rates as established by the Citv
of Friendswood:
Revised ol'11 2o2l Section II Page 8 of 22
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Engineering Department
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WASTEWATER COLLECTION SYSTEM
3 All sewers shall conform to the minimum requirements of the Title 30 of
the Texas Administrative Code, Chapter 217 of Texas Commission on
Envirotmiental Quality (TCEQ). and Galveston Countv Health District.
4 Sewers shall be separated from water lines by a minimum of nine (9) feet.
Where the minimum separation is not maintained, refer to Section III
1 04.B.4 for allowable clearances. Sewers crossing utilities other than
water, a minimum of six (6) inches of clearance must be maintained and
called out on plan and profile.
5 As maintained by the Citv of Friendswood, the public sanitary sewer shall
be defined as all sewers, including stacks and service leads, that serve
more than one sewer connection, and that are located in public easements
or street rights-of-wav and that are installed in accordance with these
Standards.
6 Sanitary lines greater than six (6) feet deep shall require stacks to facilitate
construction of service leads or service connections. Stacks shall be
shown on plans with station numbers. Place stacks and roves or tees as
shown. Where no stacks are shown, it is the responsibility of the licensed
plumber to place a Citv approved saddle for connection to the line and the
responsibility of the Citv Engineer or his designated appointee to
determine that such saddle is water tight and properly installed.
7 Materials and construction shall conform to latest Citv of Friendswood
specifications with all amendments thereto, including standard leak test.
8. Unless noted otherwise, all public sewers and service leads shall be
completely embedded in cement -stabilized sand to six (6) inches below
the pipe, twelve (12) inches above the pipe and to six (6) inches on each
side. All such bedding shall be compacted to ninety-five (95) percent
standard proctor density The cross-section so described herein shall be
termed the embedment zone.
9 Backfill all excavation areas/trenches under or within twelve (12) inches
of existing or proposed pavement or shoulder of pavement with cement
stabilized sand from the top of the pipe embedment zone to the bottom
of the subgrade. Cement -stabilized sand must develop one hundred (100)
psi compression at fortv-eight (48) hours. Backfill shall be compacted to
ninety-five (95) percent standard proctor density
Revised ol'11'2o2l Section II Page 9of_2
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Engineering Department
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WASTEWATER COLLECTION SYSTEM
10. The location of all special backfill and of proposed stacks shall be shown
by stations in the drawings.
11. Construction notes shall designate the kind and class of pipe with
exceptions to the construction notes to be shown on the plan and profile
sheets.
12. Non -sanitary sewer easements or fee strips such as pipeline, power
company drainage district, railroad, etc. are in and of themselves
insufficient and unacceptable to pennit laving of sanitary sewers and, or
force mains across or along the underlving private propertv or restricted
non -sanitary use type of public propertv
13 The final determination as to that portion of a street, allev or easement to
be occupied by a proposed sewer rests with the Citv Engineer who will
take into consideration existing, planned and proposed facilities such as
manholes, pavement, pipe -conduits, along with existing trees, shrubs, or
other unique surface conditions when arriving at a decision.
14. Where an easement for a public sewer ends at a public rights-of-wav the
last manhole shall be extended into the public rights-of-wav at a minimum
of two (2) feet beyond the propertv line: or as close to the public rights -of
wav as possible due to acceptable clearances required for other utilities
(i.e. water line and storm sewers).
15 The drawings for the sewer shall show the location of anv existing known
pipe, duct, or other obstacles that might interfere with the construction of
the sewer and call such to the attention of the Citv anv known obstacles
that might be encountered in constructing the sewer in anv location under
consideration. The Professional Engineer for the project, who shall be
licensed to practice engineering in the State of Texas, shall determine the
existence of pipes, ducts, and, or obstacles from a visual sun,ev on the
ground plus research of all public records and private records when
available.
16. All sanitary sewer mains shall be constructed utilizing pressure rated pipe
SDR 26 PN C pipe (ASTNI D 3034, latest edition), unless specifically
approved otherwise by the Citv Engineer
17
In new developments, sanitary sewer lines shall be centered in sanitary
sewer line easements.
Revised ol'112o2l Section II Page 10of_2
City of Friendswood
Engineering Department
G. Line Size
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
1 The minimum pipe diameter for a public sanitary sewer shall be eight (8)
inches.
2. Four (4) inch service leads shall be confined to the limits of the lot which
they serve and shall serve only the equivalent of one (1) single family lot.
No four (4) inch sewer shall be laid in anv street, allev or rights-of-wav
3 Six (6) inch service leads shall not serve more than the equivalent of two
(2) single-fatnily lots or other tvpes of small land tracts.
4 Four (4) inch and six (6) inch service leads for single-fatnily residential
lots shall have a minimum grade of one (1 0) percent and one-half (0.5)
percent, respectively
5 For commercial service leads such as street bores, submit a copy of the
approved plumbing drawings to establish the required size of the line. The
minimum size lead shall be six (6) inch.
6 All main and lateral sewers shall end in manholes, except for special
and, or unusual situations that are subject to specific approval by the Citv
Engineer
7 All sewer lines shall be laid at a size and depth to conform to designs
pennitting an orderly expansion of the sewer system of the Citv and so as
to avoid a duplication of lines in the future.
8. The Citv Engineer shall have final approval as to what sizes and depths
are required, along with exceptions to 'lateral service leads as previously
defined.
H. Line Depth
1
The sewer should be laid with the top of the pipe a minimum of three (3)
feet below finished grade or top of curb, whichever is lower
Revised ol'11 2o2l Section II Page 11 of 22
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Engineering Department
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WASTEWATER COLLECTION SYSTEM
2. Sewer laid in street rights-of-wav with curb -and -gutter paved streets shall
have a minimum cover of four (4) feet from the top of the pipe to the top
of the curb to anticipate future sewer extension.
3 Sewers laid in street rights-of-wav with crowned roads and side ditches
shall have a minimum cover of five (5) feet from the average ground
elevation line at the adjacent street rights-of-wav to the top of pipe.
4 Where the minimum cover as specified in paragraphs H.1, 112, and 113
above is not possible, the sewer shall be laid in Class 150 [one hundred
fifty (150) psi] pressure pipe or rigid factor, made pipe with cement -
stabilized sand backfill as shown on the CA, s Standard Details. Ductile
iron pipe shall be lined with either a polvethvlene or polvurethane coating
as approved by the pipe manufacturer and applied by either the pipe
manufacturer or an approved application. The minimum liner thickness
shall be fortv (40) mils.
5 Maximum depth for eight (8) inch, ten (10) inch, and twelve (12) inch
collection lines shall be twenty (20) feet from average ground surface to
pipe invert. Depths greater than twenty (20) feet are subject to approval
by the Citv Engineer if justified for site -specific reasons during the
preliminary engineering phase of the project design and shall be
constructed of Class 150 [one hundred fifty (150) psi] pressure pipe.
L Line Grades
The following table lists the minimum and maximum grades for six (6) inch
through twenty-seven (27) inch public sewers. The minimum grade is based on a
minimum full pipe velocity of two (2) feet per second. The maximum grade is
based on a maximum full pipe velocity of ten (10) feet per second. In both cases.
the Manning Formula has been used with an 'n of thirteen -thousandths (0.013).
The use of different pipe materials will not alter the use of thirteen -thousandths
(0 013) for the purpose of the Design Criteria Manual.
Revised ol'112o2l Section II Page 12of_2
City of Friendswood
Engineering Department
Inside Dimension
(I.D.)
of Pipe in Inches
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
Minimum Slope (in
Percent)
to Develop V=2.0 ft./sec.
I%Iaximum Slope (in
Percent)
to Develop V=10.0
ft./sec.
6
0.50
12.35
8
0.33
8.40
10
0.25
6.23
12
0.20
4.88
15
0.15
362
18
0.11
2.83
21
0.09
2.30
24
0.08
1.93
27
0.06
1.65
For seuvers larger than hrenh' seven (2-) mches in diameter the professional Engineer of record,
itho shall be hcensed to practice engnneenng in the State of Texas, shall deternnne the
appropriate grade i hlr_nng the Alannnng Fornnda, n = 0.013 and a fill pipe velocnh' of No (2.0)
fps nnrnnmm and ten (10.0),fps maxnmm.
J Manholes
1 All manholes shall be precast concrete, unless the Professional Engineer
of record, who is licensed to practice engineering in the State of Texas,
submits a cast in place' manhole design for review and approval by the
Citv Engineer All precast manholes are required to incorporate a 'boot
tvpe connector for sewer diameters up to twenty-four (24) inches. For
sewer diameters greater than twenty -foot (24) inches, utilize either the
'boot' tvpe connector (if available) or an integral gasket. All precast
manholes shall eonfonn to the latest ASTM requirements. No manholes
may be placed in the paved portion of the Citv rights-of-wav unless
approved by City Engineer
2. For all public sewers, manholes shall be placed at all changes in
alignment, changes in grade, junction points, dead-end mains, laterals, and
at street, allev or easement intersections as designs may require.
a. Sewers laid in easements shall have a manhole in each street
crossed by the sewer
b The maximum distance between manholes shall be three hundred
fifty (350) feet for eight (8) inch to fortv-eight (48) inch pipe
Revised ol'112o2l Section II Page 13of22
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WASTEWATER COLLECTION SYSTEM
diameters. Spacing for lines of a diameter larger than fortv-eight
(48) inches shall be determined on an individual project basis.
C. Sewers with the same or approximate flow line elevation shall
intersect each other at a ninety (90) degree angle. However, where
a taste perpendicular intersection cannot be obtained, and where the
entering sewer intersects the receiving sewer at or about the same
flow line, one (1) or more manholes shall be utilized to maintain a
minimum eighty (80) degree angle at the point of intersection.
When the entering sewer is on the upstream side of the manhole,
the minimum angle between the sewers may be reduced to a fortv
five (45) degree angle: provided:
1) A distinct flow channel can be maintained within the
manhole when the flowline elevations of the sewers are at,
or within, one (1) pipe diameter of the smaller pipe: or
2) When the flow line elevation of the entering' pipe is
above the crown of the 'primary sewer and clearance can
be provided between the sewers.
d. Criteria for connections to, and utilization of, manholes.
1) Where manholes are utilized to facilitate connections
between public sewers, when possible the sewers shall
either match the manhole's flow line or match the elevation
of each other's crown or utilize a manhole drop
2) Connections between public sewers at the manhole shall
adhere to the following criteria when possible
a) The elevation of the crown of the discharging sewer
shall either match the elevation of the crown of the
receiving sewer or be approved as special cases by
the Citv Engineer
b) A standard drop connection is required when the
difference in elevation between discharging sewer
flowline and receiving flowline is greater than thirtv
(30) inches.
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
3) The routing of service connection directly to mainholes is
the preferred method of termination. Where the flowline
elevation of the existing sanitary sewer is more than ten
(10) feet below grade and there is no available stack, and
either
a) The lot to be so connected is a single-faimily
owner -occupied, single lot residence connection to
an existing manhole: or
b) The lot to be so connected is a single-faimily
owner occupied, single lot residence connecting to
a proposed manhole at the end of a cul-de-sac.
4) When routing an approved service connection to a manhole
(see Item 3 above), the wall penetration shall not be greater
than ten (10) inches in diameter and shall be cored and
sealed using approved grout.
5) When routing an approved service connection to a manhole
(see Item 3 above), the connections shall utilize a drop
(either inside or outside) and shall adhere to the following
criteria.
a) The manhole wall penetration shall be a minimum
of ten (10) feet below the manhole rim elevation
and shall not be greater than ten (10) inches in
diameter
b) The drop shall be six (6) inches in diameter and
shall be constructed of SDR 26 PN C pipe (ASTM D
3034, latest edition):
c) The drop shall be located fortv-five (45) degrees
from the upstream side of the main sewer
d) An internal drop shall be affixed to the manhole
wall utilizing stainless steel bands and anchor bolts.
e) An internal drop shall terminate with a fortv-five
(45) degree bend. Said fortv-five (45) degree bend
Revised ol'112o2l Section II Page 15of22
City of Friendswood
Engineering Department
K. Lift Stations
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
shall not extend below the 'top of pipe elevation of
receiving sanitary sewer and:
f) The wall penetration (core) shall be sealed using a
grout' as approved by the Citv Engineer
g) All public sewers shall terminate in a manhole.
Clean -outs will not be utilized except at the end of
each service lead.
h) The manhole cover shall have a minimum diameter
ofthirtv-two (32) inches.
i) All sanitary sewer manholes shall have inflow
protectors.
j) All manhole covers shall have the Citv of
Friendswood seal and 'SANITARI SEWER
imprinted on the lid as shown in the Citv of
Friendswood Standard Sanitary Sewer Details.
k) Commercial pressured discharge lines terminating
in a manhole shall result in the manhole being
protected by either a coating or concrete admixture
to the interior walls of the manhole.
1 Lift station design shall comply with the Citv of Friendswood Technical
Specifications. In addition, it shall be confined that a storage volume, in
the design of the wet well, shall equal to one and one-half (1.5) times the
peak design flow to the lift station. _add ten (10) percent to account for
volume displaced by pumps.
2. A natural gas standby generator shall be required for all new lift stations.
The generator is required to be sized to operate all pumps during an
emergenev power failure.
3 A startup package for the pumps shall be submitted to the Citv Engineer
before final acceptance. This package should also include a completed
start up log sheet with field and product data. See Attachment 1.
Revised ol'11''o2l Section II Page 16of22
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Engineering Department
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WASTEWATER COLLECTION SYSTEM
4 Minimum site size shall be fortv (40) feet by fortv (40) feet. Smaller sites
that are adjacent to public rights-of-wav and are contiguous to green space
or similar land use areas, may be approved when adequate odor control
provisions are provided.
5 Pumps shall be sized to operate at optimum efficiency Minimum
acceptable efficiency at the operating point will be sixty (60) percent
unless specifically approved by the CAN, Engineer
6 Operation and maintenance shall be considered in the design of the station
and the location of the station.
7 Wet well working volume shall be sized to allow for the recommended
pump cycle of six (6) minutes for each pump
8. Prior to installation, controls and equipment shall be approved by the CAN,
Engineer
9 Emergency operations shall be considered. Provide fittings and a blind
flange that will be readily accessible for emergency bvpass pumping.
10. The inlet structure shall be designed to minimize turbulence.
11. The velocity in the force main and riser pipes shall be less than 8 feet per
second and greater than three (3) feet per second.
12. The wet well shall be sized to provide adequate clearance between the
pumps (refer to manufacturers recommended clearances).
13 A peak factor of four (4) shall be used for lift station design.
14. A minimum of two (2) feet of clearance shall be provided between pumps
and between pump and wall.
15 Low water levels shall be at least six (6) inches above impeller, or higher
if required by manufacturer
16. Complete immersion of submersible pump motor at low water level is
preferred, if possible.
17 Tie reinforcing steel in lift station bottom to wall reinforcing steel
(includes caisson construction situation) to provide watertight wetwell.
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Engineering Department
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WASTEWATER COLLECTION SYSTEM
18. Nuts, bolts, chains, and all other metal components within wetwell shall be
stainless steel, not carbon steel.
19 N cut pipe shall be eight (8) inch minimum diameter equipped with odor
control system.
20. The following Hazen -Williams Coefficient shall be used for various pipe
tvpes.
PN C New
C
= 160
10-vear
C
= 140
DIP New
C
= 140
10-vear
C
—100
21. Unless Citv Zoning regulations mandate another material, provide board
fence (either cedar or heart redwood 6' width) with steel posts set in
concrete. Fence shall be at least eight (8) feet high and include a 2' x12'
rot board.
22. Fence design shall be certified by a Texas -licensed engineer
23 Entrance drive to be at least fourteen (14) feet wide concrete pavement.
Provide enough room to park vehicles inside lift station site.
24. Indicate method of drainage of site on site plan. Internal drainage, sheet
flow and vallev gutter driveways are acceptable. Drain to street or store
sewer, never onto adjacent private propertv
25 Under no circumstances may a lift station be located within a regulator,
floodwav
26. Locate the control panel and wetwell batch above the One Hundred (100)
I ear Flood Plain. Call out the One Hundred (100) I ear Flood Plain
elevation on the plans.
27
28.
Stainless steel guide rails (or other pump removal method that avoids
entering wetwell) are required for submersible pumps.
A tee, plug valve (or gate valve), and blind flange assembly is required on
the force main on the downstream side of the discharge valves and header
Revised ol'112o2l Section II Page IS of22
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
This is required so truck -mounted pumps can bypass the lift station pumps
and piping while maintenance work is being done on lift station.
29 Bedding for PN C force main shall be basil sand.
30. PN C force mains shall be AWWA C 900.
31. Ductile Iron Pipe (DIP) force mains shall be bedded in bank sand and
polvetlivlene wrapped.
32. When calculating headloss in force main and piping, use of K factors on
fittings, with the Hazen -Williams formula, is preferred.
33 Backfill structural excavations (wetwell, etc.) with cement -stabilized sand.
34. Lift station site plans shall be submitted in scales of 1 inch = 5 feet or 1
inch = 10 feet.
35 Provide a protective coating or concrete additive to the interior walls of
the wetwell. The Citv Engineer shall approve coating or additive used.
36. Lift station shall be equipped with a telemetry system, approved by the
Citv Engineer, and shall be compatible with existing systems in the Citv
A submersible transducer for SCADA shall be installed and connected to
telemetry system to monitor status of lift station.
37 Power supply to lift station shall be three (3) phase and four hundred
eighty (480) volts where possible.
38. A system of floats shall be provided to control pumps.
39 A pressure gauge suitable for application shall be installed on each
discharge pipe.
40. A 1 inch minimum water service equipped with backflow prevention shall
be provided at the lift station site.
L. Grease Traps; Grease Interceptors
Gravitv grease interceptors shall be designed to remove grease from effluent and
shall be sized in accordance with this section. Gravity grease interceptors shall
Revised ol'112o2l Section II Page 19of22
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Engineering Department
Design Criteria Manual
WASTEWATER COLLECTION SYSTEM
also be designed to retain grease until accumulations can be removed by pumping
the interceptor
1 Each grease trap/ grease interceptor shall be installed in such a manner that
it can be easilv accessible for inspection, cleaning, and removal of the
intercepted grease. All pennitting, construction, design, and inspection
activities must be completed in accordance with the manufacturer s
instructions and the International Plumbing Code. Additionally the
following specifications must be incorporated into grease trap design.
2.
a. The grease trap grease interceptor shall be constructed with a
minimum of two baffles.
b Grease traps, grease interceptors are to be installed at a minimum
distance of 10 feet from sinks and dishwashers to allow for
adequate cooling of the wastewater Water temperatures must be
less than one hundred twenty (120) degrees prior to entering grease
trap
C. All grease bearing waste streams should be routed through an
appropriate grease traps,grease interceptor, including: three
compartment sinks, potpan sinks, soup kettles, hand -washing
sinks, dishwashers, mop sinks, and floor drains. Notable
Exceptions. Drains that receive clear waste only such as from
ice machines, condensate from coils, and drink stations, may be
plumbed to the sanitary system without passing through the grease
trap
d. All exterior or recessed grease traps, grease interceptors are to be
installed with an effluent sampling well.
Requirements for traps are as follows.
a. Equipment and facilities of a type and capacity approved by the
approving authority shall be provided.
b The trap shall be located in a manner that provides readv and easv
accessibility for cleaning and inspection.
C. The trap shall be maintained in effective operating condition so as
to meet an effluent oil, grease test parameter of less than one
hundred (100) mgi1.
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WASTEWATER COLLECTION SYSTEM
d. Traps shall conform to a minimum detention time of thirtv (30)
minutes and a maximum of sixty (60) minutes.
e. The minimum size shall be one thousand (1,000) gallons or greater
as determined by the design engineer
105 APPURTENANCES — Reserved
106 SUBDIITTALS
A. Preliminary design — submit the following for review and comment:
1 Copies of anv documents which grant approval of exceptions to the CAN, s
Design Criteria.
2. Design calculations for line sizes and grades.
3 Contour map for overall area.
4 Plan and profile sheets showing proposed improvements (City projects
only).
5 Geotechnical soils report for the project (City projects only).
B. Final design — submit the following for approval.
1 Final documents of the above plus plan and profile sheets and
Geotechnical soils reports for non -City projects.
2. Review prints.
3 Original drawings.
4 Copv of Engineer s Summary Transmittal Letter to TCEQ
107 QtTALIT1 _ASSURANCE
Prepare calculations and construction drawings under the supervision of a Professional
Engineer licensed to practice engineering in the State of Texas and trained in the
disciplines required by the drawings. The final construction drawings must be sealed.
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WASTEWATER COLLECTION SYSTEM
signed, and dated by the Professional Engineer licensed to practice engineering in the
State of Texas, and shall be responsible for the development of the drawings along with
their fine s registration information.
2.0 EXECUTION
2.01 RESEARCH REQtTIREDIENTS
A. Research existing utilitv and rights-of-wav information.
B. N erifv that no restrictions exist that will dery approval of the project concept.
2.02 DESIGN ANALYSIS
Calculations of design flows for overall development project.
2.03 DRAWINGS
Drawings shall include lavout sheets with contours, plan and profile sheets, and detail
sheets for special items and treatment plants.
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Engineering Department
SECTION III
Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
WATER LINE DISTRIBUTION SYSTEM
DESIGN REQUIREMENTS
1.0 GENERAL
A. Should anv portion of this Section conflict with the Subdivision Ordinance or the
Zoning Ordinance, the more stringent of the latter two (2) shall govern.
B. Should anv section conflict with TCEQ Regulations. the more stringent of the two
(2) shall govern.
C The Citv Engineer shall have the final interpretation of anv provisions in this
Design Criteria Manual.
D The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
101 CHAPTER INCLUDES
Criteria for the design of water lines.
102 REFERENCES
A. Texas Commission on Environmental Qualitv (TCEQ). Water Utilities Division
'Rules and Regulations for Public Water Systems, latest revision.
B. American Water Works _association (AWWA).
C National Sanitation Foundation (NSF).
D Texas Department of Health.
E. Texas State Board of Insurance.
F International Fire Code (IFC).
G. City of Friendswood Standard Details and Technical Specifications, latest
version. These can be downloaded from.
www.ci.friendswood.tx.us,'350/Publications-Foniis.
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103 DEFINITIONS
Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
Water Line — Closed conduits designed to distribute potable water for human
consumption to various areas and provide fire protection. Line size and fire protection
accessory locations are dependent on distance from primary source and quantity of
demand.
104 DESIGN REQtTIRENIENTS
A. Easements for water lines.
1 Lines shall be located within street rights-of-wav permanent access
easements with overlapping public utility easements, easements adjacent
to street rights -of wav or recorded water line easements.
2. When outside of a public street rights-of-wav or permanent access
easement with an overlapping public utilitv easement, easements must be
dedicated and restricted for water lines only
3 When possible, easements shall be contiguous with public rights-of-wav
4 Except for side lot easements, water line easements shall be contiguous to
a paved access.
5 For water lines twelve (12) inches or smaller located outside of street
rights-of-wav minimum width of easement shall be ten (10) feet.
6 For water lines fourteen (14) inches or larger located outside of street
rights-of-wav the minimum width of easement shall be fifteen (15) feet.
7 For water mains located less than five (5) feet from the rights-of-wav line,
the outside edge of a water line easement shall be located from the rights-
of-wav line as follows.
Twelve (12) inch and smaller pipe — five (5) feet
Fourteen (14) inch and larger pipe —ten (10) feet
8. Water lines along State rights-of-wav shall be installed outside of the
rights-of-wav whenever possible and in a separate ten (10) foot minimum
contiguous easement.
9 No back lot easements shall be allowed for the installation of water lines,
unless specifically approved by the CAN,
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10. Commercial developments requiring on -site fire hvdrants must provide a
minimum fifteen (15) foot water line easement for the water line and fire
hvdrant.
11. In new developments, water lines shall be centered in water line
easements.
12. When using side lot easements, such easements shall be a minimum of ten
(10) feet in width, located on one (1) lot or centered between lots. If
centered between lots, the water line may be centered within the five (5)
foot easement on one (1) lot, or centered in the full ten (10) foot easement.
13 Location of water lines in an easement not adjoining a public rights -of
wav shall be prohibited, except as specifically approved by the CAN,
Engineer When approved, these water mains will be centered in a fifteen
(15) foot wide exclusive easement restricted to water only
B. Location of water lines.
1 Locate within street rights-of-wav
2. Location of water lines within an easement — locate water lines in the
center of a ten (10) foot minimum width dedicated waterline easement.
Within a commercial development, center water lines within a fifteen (15)
foot easement. Obtain approval for lines to be located in wider or multi-
use easements.
3 When a water main is placed parallel to another utilitv line at or near the
same grade, it shall have a minimum of nine (9) feet of horizontal
separation. When the other utilitv is a sanitary sewer and a minimum of
nine (9) feet cannot be maintained, the sanitary sewer must be constructed
of pressure type pipe with watertight joints as used in water main
construction and the clearances must be defined as in Section II —
Wastewater Collection Svstem Design Requirements or as specifically
approved by the CAN, Engineer When a water main crosses a utility other
than sanitary sewer, a minimum of six (6) inches of clearance must be
maintained, and the water main shall have one (1) joint of pipe, a
minimum of eighteen (18) feet long, centered on the other utilitv
4 When water mains and sanitary sewers are installed, thev shall be installed
no closer to each other than nine (9) feet in all directions, and parallel lines
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must be installed in separate trenches. Where the nine (9) foot separation
distance cannot be achieved, the following procedures shall be used:
a. Where a sanitary sewer parallels the water main, the sanitary sewer
shall be constructed of ductile iron, or PNC pipe meeting AWWA
specifications, having a minimum working pressure rating of one
hundred fifty (150) psi or greater, and equipped with pressure type
joints. The water mains and sanitary sewer shall be separated by a
minimum vertical distance of two (2) feet, and a minimum
horizontal distance of four (4) feet, measured between the nearest
outside diameters of the pipes, and the water main shall be located
above the sewer Refer to Section II — Wastewater Collection
Svstem Design Requirements.
b Where a sanitary sewer crosses the water main, and that portion of
the sewer is constructed within nine (9) feet of the water, as
described above, the water line may be placed no closer than six
(6) inches from the sewer The separation distance must be
measured between the nearest outside pipe diameters and the water
line shall be located at a higher elevation than the sewer, and one
(1) joint [a minimum of eighteen (18) feet long)] of the new pipe
must be centered on the existing line.
C Water line size.
1 Six (6) inch lines may be used on dead-end lines within cul-de-sacs, or if
the line is less than one thousand (1,000) feet in length and interconnected
between two (2) lines which are eight (8) inches in size or larger The
maximum number of fire hvdrants on anv length of six (6) inch line is one
(1).
2. Eight (8) inch lines may be used for lines over one thousand (1,000) feet
long, or when two (2) or more fire bvdrants are required.
3 Twelve (12) inch and larger lines — line length, usage, etc. to be
determined by a Professional Engineer of record licensed to practice
engineering in the State of Texas, and approved by the Citv Engineer
D Dead-end lines.
1 Dead-end lines within public rights-of-wav
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WATER LINE DISTRIBUTION SYSTEM
a. On permanent dead-end lines, other than on cul-de-sacs, the
dimension of the line shall be six (6) inches and shall not exceed
more than five hundred (500) feet in length from the closest
interconnecting main line. In addition, it shall terminate with a fire
hvdrant.
b On permanent dead-end lines on cul-de-sacs it will be required to
reduce the pipe size successively It is required to earn, an eight
(8) inch pipe to the next to last hydrant, then from that point use a
six (6) inch pipe to the line's end. It is required to place the last
service as near as possible to the end, and install a fire hvdrant or
two (2) inch blow -off at the end of the six (6) inch line. The
maximum length of this reduced line size configuration shall not
exceed eight hundred (800) feet.
2. Dead-end lines with one (1) on -site fire hvdrant.
a. Six (6) inch lines may be used for lengths less than two hundred
(200) feet provided domestic service is taken from the end of the
line.
b Eight (8) inch lines may be used for lengths greater than two
hundred (200) feet but less than five hundred (500) feet, provided
domestic service is taken from the end of the line.
E. Depth of cover
1 Fourteen (14) inch and smaller mains shall have a minimum cover of four
(4) feet from top of curb. For open ditch roadway sections, lines fourteen
(14) inches and smaller shall be installed at least three (3) feet below the
ultimate flowline of the ditch or six (6) feet below natural ground at the
rights-of-wav line, whichever is deeper and maintain the elevation
throughout that section of line.
2. Sixteen (16) inch and larger mains shall have minimum cover of five (5)
feet from top of curb For open ditch roadway sections, lines sixteen (16)
inches and larger shall be installed at least three (3) feet below the flow
line of the ditch or seven (7) feet below natural ground at the rights -of
wav line, whichever is deeper and maintain the elevation throughout that
section of line.
3 Changes in grade, to clear other utilities or underground features, may be
made by deflecting pipe joints. The maximum designed deflection shall
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WATERLINE DISTRIBUTION SYSTEM
be one half (0 5) of the manufacturer's allowable deflection If a depth
greater than eight (8) feet to the top of the pipe is required, a welded steel
section shall be used The standard depth of cover is to be maintained
above the water main and the grade change shall be made using the
welded steel section The installation of fittings for vertical deflections, or
changes in elevation shall not be allowed except with specific approval by
the City Engineer
F Stream and Ditch Crossings
1 Elevated Crossings
a All water lines shall be steel or restrained joint metallic
pipe, and shall extend a minimum of fifteen (15) feet
beyond the last bend or to the rights of way line, whichever
is greater
b Underground crossings via bored polyethylene pipe
preferred to elevated crossings
c Use a separate elevated supporting structure for sixteen
(16) inch and larger water lines, unless otherwise approved
by the City Engineer The structure shall be located a
minimum of ten (10) feet from any other existing or
proposed structure
d Support water lines on existing or proposed bridges The
following criteria may be used for fourteen (14) inch and
smaller lines when approved in advance by the City
Engineer
t Adequate structural capacity shall be required
n Sufficient clearance above the bent cap elevation
shall be required for installation under a bridge
e Design elevated crossings with the elevation of the bottom
of the water line above the low chord of the nearest
adjacent bridge, or a minimum of one and one half (1 5)
feet above the One Hundred (100) Year Flood Plain
elevation, whichever is higher
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WATER LINE DISTRIBUTION SYSTEM
f. Extend pipe from rights-of-wav to rights-of-wav for
crossings.
g. Provide sufficient span length to accommodate for the cross
section of anv future widening of the stream or ditch, if
available.
h. Support the line on columns spaced to accommodate the
structural capacity of the pipe, considering deflection and
loading.
i. Base column support design on soil capacity spacing,
loading, and structural requirements.
G. Underground crossings.
1 Provide a minimum three (3) foot clearance above the top of the pipe to
the ultimate flow line of the ditch.
2. Provide sufficient length to exceed the ultimate firture development of the
stream or ditch.
3 All water lines shall be steel, restrained joint, or polvethvlene pipe and
shall extend a minimum of fifteen (15) feet beyond the last bend or to the
rights-of-wav whichever is greater In addition, the water lines shall have
valves located on both sides of the crossing.
H. TxDOT highwav and county road crossings
1 Extend carrier pipe from rights-of-wav to rights-of-wav
2. Use welded steel pipe, or restrained joint pipe in steel casing, under
existing and future roadways. The pipe shall be installed from a point
fifteen (15) feet outside of the service road, or outside of pavement toward
the rights-of-wav to a similar point on the other side of the highwav
across the rights -of wav For highwav or roadway crossings with open
ditch sections, extend the casing from rights-of-wav to rights-of-wav
3 Highwav and county road crossings shall be constructed in conformance
with the applicable requirements of where the line is located. (i.e. Texas
Department of Transportation. Galveston Countv or Harris Countv)
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WATER LINE DISTRIBUTION SYSTEM
4 When additional rights-of-wav has been acquired, or will be required for
future widening, the casing where required, shall be carried to within ten
(10) feet of each future rights-of-wav line.
L Street crossings
1 All water mains and sprinkler line crossings, under major thoroughfare
boulevards, shall be encased using a minimum SDR rated or PN C pipe as
required by the Citv s construction detail for 'Water Main Encasement.
Welded steel pipe may be substituted on street crossings, when
specifically approved by the Citv Engineer
2. Crossings under existing concrete streets, other than major thoroughfares,
shall be constructed by boring and jacking. PN C and SDR rated pipe shall
be jacked into place with equipment designed for that purpose. Water
may be used to facilitate boring and jacking operations. Jetting the pipe
main into place shall not be pennitted. When conditions exist that warrant
an open cut across the existing street, approval by the Citv Engineer shall
specifically be required.
3 All open cut installations, under existing or proposed streets, shall be
baekftlled as required by City s Standard Details.
4 All street crossings shall be constructed in accordance with construction
plans approved by the Citv All street crossings shall be inspected by a
Citv Project Manager, and shall meet the requirements of these standards.
J Oil and gas pipeline crossings.
Metallic pipe shall not be used when crossing oil or gas transmission lines, unless
a properly designed cathodic system is approved by the Citv Engineer and it is
properly installed. Other pipe may be used, regardless of depth, subject to
approval by the Citv Engineer There must be a minimum of two (2) feet of
separation between the pipeline and waterline.
K. On -site fire loops within commercial and multi -family developments.
1 For commercial and multi -family developments, requiring on -site fire
hydrants, the following requirements shall be complied with to allow
maintenance and future repair operations.
a. Placement of structures or equipment pads within the easement
shall not be pennitted.
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b Provide a ten (10) foot wide longitudinal pavement joint along the
easement lines where the water line is located under a drivewav
paved parking, or street pavement.
L. _additional requirements.
1 The carrier line shall extend a minimum of one (1) foot beyond the end of
the casing to allow flanged joints to be connected.
2. For welded steel bends, extend steel pipe a minimum of five (5) feet
beyond the bend.
X1. _huger (bore) construction.
a. Use the following general criteria for establishing auger or bore sections.
a. _huger or bore sections shall be clearly shown on drawings.
b Improved streets — use auger construction to cross the street
regardless of surface. _huger length shall be calculated utilizing the
roadway width, at the proposed bore location, plus an additional
five (5) feet to either side of the roadway as applicable.
C. Sidewalks — when the water line crosses under a sidewalk, four (4)
feet or more in width and in good condition, the sidewalk shall be
bored and jacked or the sidewalk shall be removed and replaced to
the Citv of Friendswood Standard Details requirements, whichever
is most cost effective. Bore and jack length shall be at least the
width of the sidewalk. The proposed tvpe of construction shall be
noted on the plans.
d. Bore Pits — Bore pits shall be at least three (3) feet from back of
curb and shall be at least five (5) feet from the back of curb on a
boulevard or major thoroughfare. All bore pits shall be shored in
accordance with OSHA requirements. Bore pits and,or receiving
pits to be located in a street or drivewav paving, shall be shown on
the plans.
N Water qualitv — overall system lavout.
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WATER LINE DISTRIBUTION SYSTEM
1 Circulation and flushing — The lavout of the overall water distribution
system shall provide the maximum circulation of water to prevent future
problems of odor, taste, or color due to stagnant water
a. Provide a source of fresh water at each end, or at multiple points of
a subdivision to create a plivsical loop. Provide ways to create
circulation, and valves and fire hvdrants shall be located to allow
simple flushing of all lines.
b Where stubs are provided for future extensions, isolate the stub
with a valve, and place one (1) full pipe joint beyond the valve,
plug end of pipes. Service connections are to not be connected to
the stub
C. All materials which come in contact with public drinking water in
anv stage shall eonfonn to _ANSI NSF Standard 60
d. Lavout and size of all water mains shall be consistent with the
overall lavout and phasing plan of the Citv s water system. The
overall water system shall be designed to maintain adequate
pressure throughout the system.
e. Dead -ends shall be avoided whenever possible: in an unavoidable
pennanent dead-end situation, reduce the sizes of pipe
successively Cam, an eight (8) inch pipe to the next to last fire
hvdrant and use a six (6) inch PN C to the end of the line. Provide
a fire hvdrant or two (2) inch blow -off at the end of the main.
O Clearance of water line from other utilities. (New water lines constructed near
sanitary sewers and force mains).
1 New water lines parallel to sanitary sewers and force mains.
a. Water lines shall be located a minimum of nine (9) feet
horizontally outside wall to outside wall, when parallel to sanitary
sewers or force mains. Use the following procedure when nine (9)
feet of separation cannot be achieved.
When a new water line is to parallel to an existing sanitary sewer
force main and, or gravitv sanitary sewer, and the nine (9) foot
minimum separation distance cannot be maintained, the existing
sanitary sewer shall be replaced with lined ductile iron or PN C
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pipe meeting ASTNI specifications. In addition, the waterline shall
have a minimum working pressure rating of one hundred fifty
(150) psi or greater, and be equipped with pressure type joints.
The water lines and sanitary sewer shall be separated as per the
design requirements of TCEQ at a minimum horizontal distance of
four (4) feet measured between the nearest outside walls of the
pipe. In all cases, the water line shall be located above the sanitary
sewer When a water main crosses a utilitv other than sanitary
sewer, a minimum of six (6) inches of clearance must be
maintained, and the water main shall have one (1) j oint of pipe [a
minimum eighteen (18) feet long] centered along the other utilitv
line.
b Where a sanitary sewer crosses a water main and that portion of
the sanitary sewer within nine (9) feet of the water is constructed
as described in Section 290 44(e) of the TCEQ Rules and
Regulations, the water line may be placed no closer than six (6)
inches from the sewer The separation distance must be measured
between the nearest outside pipe diameters. The water line shall be
located at a higher elevation than the sanitary sewer wherever
possible and one (1) joint of the new pipe [a minimum of eighteen
(18) feet long] shall be centered on the existing line.
2. When water lines are installed in areas which have existing sanitary
sewers, ever, effort should be made to maintain nine (9) feet of separation
between the outside pipe diameters of the two (2) lines. Where this
separation cannot be achieved because of local conditions, which must be
full, documented in anv planning material submitted, the following
spacing s shall be observed.
a. Where a new water line is to cross or be installed parallel with an
existing sanitary sewer and the sanitary sewer is constructed as
described in Section 290 44(e) of the TCEQ Rules and
Regulations, the separation distances specified in those rules shall
apply as though the sanitary sewer was new
b Where a new water line is to be installed parallel to an existing
clay truss, or concrete gravitv sanitary sewer showing no evidence
of leakage vertically and horizontally for a distance of four (4) feet,
the sanitary sewer is not to be disturbed. Should excavation for the
water line produce evidence that the sanitary sewer is leaking: the
sanitary sewer shall be repaired.
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C. Where a new water line is to cross an existing clay truss, or
concrete gravitv sewer showing no evidence of leakage vertically
or horizontally for a distance of four (4) feet, the sewer is not to be
disturbed if the water line is installed at least twenty-four (24)
inches above the existing sanitary sewer One (1) full joint of the
water line [at least eighteen (18) feet long] shall be centered over
the sanitary sewer crossing, so as to provide maximum protection
against contamination.
d. Where there is an existing clay truss or concrete sanitary sewer
pipe showing no evidence of leakage, and because of physical
limitations shall remain at a higher elevation than the proposed
intersecting water line, an exception to the nine (9) foot
requirement may be granted as long as the water line is inserted in
a joint of pressure type carrier pipe at least eight (8) feet and two
(2) nominal sizes larger than the waterline. The carrier pipe shall
be centered on the sanitary sewer crossing and both ends sealed
with cement grout. In lieu of this procedure, that portion of the
sanitary sewer within nine (9) feet of the water line may be
replaced with cast iron or ductile iron pipe with water -tight joints
as described in Section 290 44(e) of the TCEQ Rules and
Regulations, above.
3 Sanitary sewer manholes — provide a minimum nine (9) foot horizontal
clearance from outside wall of existing or proposed sanitary sewer
manholes, unless manholes and connecting sanitary sewers can be made
water -tight and tested for no leakage. If a nine (9) foot clearance cannot
be obtained, the water line may be located closer to a manhole when prior
approval has been obtained from the CAN, Engineer using one (1) of the
procedures below however in no case shall the clearance be less than four
(4) feet:
a. A steel water line may be encased in a steel carrier pipe. Open cut
and backfill with compacted cement -stabilized sand.
b The water line may be augured past the manhole, as long as one (1)
eighteen (18) foot section of class 150 pipe, is installed centered
on the existing sanitary sewer manhole and a bentonite, elav
mixture is utilized during the auguring process.
4 Fire hvdrants shall not be installed vertically or horizontally within nine
(9) feet of sanitary sewer mains, service leads, and force mains regardless
of construction.
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105 APPURTENANCES
A. N alves.
Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
1 Shall be set at maximum distances along water lines as follows.
a. Six (6) inch through fourteen (14) inch — one thousand (1,000)
feet.
b Sixteen (16) inch through twenty (20) inch — two thousand (2,000)
feet.
C. The total number of valves at anv intersection shall equal the total
number of lines leading out from the intersection point minus one
(1), three (3) valves for a cross, and two (2) valves for a tee, unless
otherwise specified.
B. N alve Tvpes.
1 N alve tvpes (all valves shall open counterclockwise and have mechanical
joints):
a. Six (6) inch through fourteen (14) inch — gate valves.
b Sixteen (16) inch through twenty (20) inch — butterfiv valves.
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C N alve Location.
Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
1 All water lines shall be valved within the street rights-of-wav N alves
shall not be placed under or within two (2) feet of ultimate pavement,
except as specifically approved by the Citv Engineer
2. N alves shall be located on the projection of intersecting street rights -of
wav lines, or at the curb return adjoining a paved street across the main.
Tapping Sleeves and N alves are excluded from this requirement.
3 Fire hydrants shall be isolated from the service line with a valve located at
the fire hvdrant branch. This valve shall not be located in the slope or
flowline of ditches on open ditch streets.
4 Inter iediate valves, not located on the projection line of the rights -of wav
line, shall be located on lot lines or five (5) feet from the fire hvdrants.
The valves are not set in driveways or sidewalks.
5 Locate valves a minimum of nine (9) feet horizontally from sanitary sewer
crossings.
D Fire Hydrants.
1 Spacing.
a. Hvdrant spacing shall be governed by the International Fire Code
as adopted and amended by the Citv of Friendswood.
2. Location in or along street rights-of-wav
a. Fire hvdrants shall be located at street intersections where possible,
but in anv case, not more than the spacing noted in la.
b Locate fire hvdrants at P C s of the intersection curb radius, three
(3) feet behind the existing curb or location of a future curb
C. On all TxDOT highways, county roads and open -ditch streets, fire
hvdrants shall be set within three (3) feet of rights-of-wav lines.
Fire hvdrants lead valves shall not be located in the slopes or
flowlines of ditches.
d. Fire hvdrants located between rights-of-wav intersections should
be set at a lot line, however, this location may be adjusted five (5)
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feet either wav to miss driveways or other obstructions, in which
case the fire hvdrant should not be closer than three (3) feet from
curbed driveways or five (5) feet from non -curbed driveways.
e. Fire hvdrants shall not be installed within nine (9) feet of a sanitary
sewer system under anv condition.
3 Location of fire hvdrants outside the street rights-of-wav
a. The Citv Fire Marshal will establish and approve the location of
fire hvdrants in apartment complexes, and platted private street
developments within the Citv
b Locate fire hvdrants in protected, easilv accessible areas behind
curb lines.
C. For fire hvdrants, which are located adjacent to water lines
constructed in ten (10) foot wide waterline easements, the fire
hvdrant shall be centered in a minimum ten (10) foot by ten (10)
foot separate easement.
d. For commercial and multi -family developments, provide isolation
valves at each end of fire loops requiring on -site fire hvdrants.
4 Fire Flow Requirements for Buildings.
a. The minimum fire flow requirements for one (1) and two (2)
familv dwellings, having a fire -flow calculation area which does
not exceed three thousand six hundred (3,600) square feet, shall be
one thousand (1,000) gallons per minute. Fire flow and flow
duration for dwellings having a fire -flow calculation area in excess
of three thousand six hundred (3,600) square feet shall not be less
than that specified in Exhibit A — Table B105 1 of the International
Building Code, as adopted and amended by ordinance.
5 Fire hvdrants should be audited for flow and pressure, be of specified type,
and painted per Citv Technical Specifications.
E. Fittings.
1
All fittings shall be identified and described on the construction plans.
Refer to Citv Standard Details for additional requirements.
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Engineering Department
Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
2. Fittings are not pennitted in fire livdrant leads, except as specifically
approved by the Citv Engineer
3 Water line fittings shall be mechanical joints only Push -on joints may be
used at special locations, if specifically approved by the Citv Engineer
4 All plugs shall be provided with retention clamps.
5 Polvetbvlene tube encasement shall conform to the minimum requirements
of 'Polvetbvlene Encasement for Grav and Ductile Cast Iron Piping for
Water and Other Liquids ANSI,AWWA C105 current revision. Soils
within the project shall be tested in accordance with _appendix A of
ANSIAWWA C105 to adequately determine the requirements for
encasement.
6 Concrete thrust blocking shall be required on all bends, tees, plugs and
combinations thereof.
7 All fittings and fire hvdrants shall be tied together with three-quarter
(0 75) inch stainless steel all -threads and I -bolts or approved equal (i.e.
Mega Lug Fittings).
F Water main service.
1. Water main service for lines in or along street rights-of-wav
a. Meters two (2) inch and smaller — shall be located in rights-of-wav
water line easements, or in a minimum five (5) foot x five (5) foot
separate water meter easement on private propertv
b Meters three (3 inches and larger — shall be located at the propertv
line or in a minimum ten (10) foot x twenty (20) foot separate
water meter easement if neeessary
C. Meters shall be located in areas with easv access and protected
from traffic and adjacent to rights-of-wav whenever possible.
d. Meters shall not be located in areas enclosed by fences.
e. Separate tap and service leads shall be designed for each meter
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Engineering Department
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WATER LINE DISTRIBUTION SYSTEM
f. Meters larger than two (2) inches must have a bvpass assembly and
coupling for easy change out. Contact the Department of
Engineering and Projects for additional requirements.
g. The minimum sized line for two (2) meters shall be three (3)
inches or larger
2. For proposed apartments or town homes in private street developments,
provide one (1) master meter sized for the entire development. Exceptions
may be granted by the Citv Engineer for unusual circumstances. If an
exception is approved, multiple meters shall not be interconnected.
3 All sprinkler and irrigation lines shall be equipped with a backflow
prevention device according to its application as required by current
TCEQ regulations. The backflow assembly shall be located after the
water meter for an irrigation system, and in a vault near the building for a
sprinkler system. A certified technician shall test applicable backflow
prevention assemblies annually and submit the results to the Citv
106 SUBMITTALS
A. General — Conform to the following submittal requirements in addition to those of
general procedure of the Citv of Friendswood.
B. Water Line Sizes — Submit justification, calculations, and locations for proposed
six (6) inch lines, and for lines twelve (12) inch and larger, for approval by the
Citv Engineer, unless water line sizes are provided by the Citv in advance.
C N alves — Submit information for approval by the Citv Engineer with justification
and locations for the use of sixteen (16) inch and twenty (20) inch gate valves
proposed as substitutes for butterfiv valves.
D Water Meter Service.
1 A pennit shall be obtained from the Building Division for meter services
and metered sprinkler connections prior to construction.
2. Requests for more than one (1) service meter on a proposed private street,
or a multi -family development, shall be submitted to the Department of
Public Works.
E. Elevated stream or ditch crossings — Submit design calculations for support
columns and column spacing.
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Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
F Master Development Plan — For multiple -phase developments, submit a master
development plan along with construction plans.
G. A double check backflow prevention assembly is required for three (3) inch and
larger lines.
107 QtTALIT1 _ASSURANCE
Prepare calculations and construction drawings under the supervision of a Professional
Engineer licensed to practice engineering in the State of Texas and trained in the
disciplines required by the drawings. The final construction drawings must be sealed,
signed, and dated by the Professional Engineer licensed to practice engineering in the
State of Texas, shall be responsible for the development of the drawings along with their
fine s registration information.
2.0 EXECUTION
2.01 RESEARCH REQtTIREMENTS
A. Research existing utilitv and rights-of-wav information.
B. N erifv that no restrictions exist that will dery approval of the project concept.
2.02 DESIGN ANALYSIS
A. Water line sizes — Minimum pipe size is 8' with 10' also being common.
Prepare narrative justification and calculations for proposed six (6) inch lines, and
for lines twelve (12) inches and larger, unless sizing is provided by the Citv in
advance.
B. Elevated stream or Ditch Crossings — Prepare design calculations for support
columns and column spacing.
2.03 DRAWINGS
A. General. Conform to the following drawing requirements, in addition to those
identified within the Citv's Standard Water Line Details, the Citv s Technical
Specifications, and within 'Section I — Graphic Requirements of this manual.
B. _appurtenances — Identify describe, and enclose in rectangular box on drawings.
1 N alves
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Design Criteria Manual
WATER LINE DISTRIBUTION SYSTEM
a. Designate six (6) inch through twelve (12) inch gate valves with
box as GN &B.
b Provide complete description and size for other valves.
2. Water meters, service leads, and metered sprinkler connections.
a. Show the location of service line tees, tapping sleeve valves, valve
boxes, and temporary plugs to be installed to serve future three (3)
inch or larger meters.
b Develop plan and profile sheets for four (4) inch and larger leads,
and connections that cross public rights-of-wav or other utilities.
C Construction features.
Show all special construction features required to complete the project, in a safe,
convenient, and economical manner
D Auger Construction.
1 If the construction is predominately open cut, all portions of the street that
must be augured shall be clearly shown on drawings by location and
length. Include designation of sections at trees with six (6) inches or
larger diameters, located within ten (10) feet of a water line.
2. Curbs — Include a requirement on drawings for construction of ADA
ramps at street intersections where curbs are to be removed, or are
damaged by water line construction. Conform to the Citv's Standard
Details for ADA ramps.
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City of Friendswood
Engineering Department
SECTION IV
STREET PAVING DESIGN REQUIREMENTS
1.0 GENERAL
Design Criteria Manual
STREET PAVING
A. Should anv portion of this Section conflict with the Subdivision Ordinance or the
Zoning Ordinance, the more stringent of the latter two (2) shall govern.
B. The Citv Engineer shall have the final interpretation of anv provisions in this
Design Criteria Manual.
C The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
101 CHAPTER INCLUDES
Geometric design guidelines for streets, criteria for street paving, and standard paving
notes for drawing call outs.
102 REFERENCES
A. ASHTO — American _association of State Highwav and Transportation Officials.
B. _aSTNI — American Societv for Testing Materials.
C _aCI — American Concrete Institute.
D TXIUTCD — Texas Manual on Uniform Traffic Control Devices.
E. City of Friendswood Standard Details and Technical Specifications, latest
version. These can be downloaded from
www.ci.friendswood.tx.us,'350/Publications-Foniis.
103 DEFINITIONS
A. Geotechnical Engineer — An engineer certified by the American _-association for
Laboratory _-accreditation (AMA).
B. HMAC — Hot Mix _-asphaltic Concrete.
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STREET PAVING
C Curb -and -Gutter Streets — Full -width reinforced concrete pavement or asphaltic
pavement with curbs. Curb -and -gutter streets require inlets and underground
stone sewers.
D Open -Ditch Streets — Full -width reinforced concrete pavement or asphaltic
pavement with open ditches. Open -ditch streets do not require underground stone
sewers, however, the ditches shall be designed to accommodate the storm water
runoff.
104 DESIGN REQtTIREDIENTS
The following design requirements are applicable to all street pavement constructed within
rights-of-wav
A. General.
1 Paving and construction plans for all streets shall be approved by the CAN,
Engineer
2. Street design shall conforn to all applicable planning tools, such as the
Texas Manual on Uniform Traffic Control Devices, major thoroughfare
plans, master plans, etc. Other considerations for design shall include
street function, street capacity service levels, traffic safetv pedestrian
safetv and utilitv locations. These additional considerations may affect
the minimum requirements set forth herein. Refer to the Citv of
Friendswood Major Thoroughfare Plan for streets requiring additional
considerations. The Major Thoroughfare Plan may be found at
www.ci.friendswood.tx.us,'350/Publications-Foniis.
3 Designs shall eonforn to the Citv of Friendswood Standard Details and
Technical specifications.
4 The use of individual pavers are not allowed in the CAN, of Friendswood
rights-of-wav The only exception for use of individual pavers in the
rights-or-wav is for sidewalks in the Downtown District. Stamped
concrete is allowed in the CAN, of Friendswood rights-of-wav
5 No asphalt turnouts are allowed in the CAN, of Friendswood rights-of-wav
6 Concrete mix design shall conforn to the CAN, of Friendswood Technical
Specifications.
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Engineering Department
B. Minimum Width Requirements for Concrete Paving:
Design Criteria Manual
STREET PAVING
1 Curb -and -gutter concrete and HXIAC streets for low -density residential
developments such as SFR, XIFR L, and NIFR-GHD- twenty-eight (28)
feet from back of curb to the back of curb
2. Pavement for open -ditch streets used for only SFR residential
developments with minimum one hundred twenty (120) foot wide lots.
twenty-six (26) feet from edge of pavement to edge of pavement.
3 Streets for medium to high density residential, commercial, and collector
streets. fortv-one (41) feet from back of curb to back of curb, or from
edge of pavement to edge of pavement.
4 Streets for major thoroughfares or boulevards. two (2) divided pavement
sections of twenty-five (25) feet from back of curb to back of curb [Four
(4) lane divided roadway], or two (2) pavement sections thirtv-four (34)
feet from back of curb to back of curb [six (6) lane divided].
5 Radius for cul-de-sac pavement on any street shall be a minimum of fifty
(50) feet, measured from the face of curb. Radius of rights -of wav for cul-
de-sacs shall be ten (10) feet greater than the cul-de-sac pavement, no less
than sixty (60) feet.
C Minimum Thickness and Reinforcement Requirements for Concrete and HXIAC
Pavement:
The following requirements shall be the minimum allowable. Pavement thickness
and reinforcement, not less than the minimum requirements, shall be designed by
a Professional Engineer licensed to practice engineering in the State of Texas and
who is responsible for the project. The design shall be based on a current soils
analysis and recommendations conducted by a qualified geotechnical engineer
1
For pavement widths twenty-eight (28) feet from back of curb to back of
curb or twenty-six (26) feet from edge of pavement to edge of pavement:
a. Minimum concrete slab thickness shall be six (6) inches with an fc
equal to three thousand four thousand (4,000) psi. Reinforcement
shall be Grade 60, fv = 60,000 psi. 44 deformed reinforcing bars,
spaced at sixteen (16) inches center to center, both ways and with a
minimum lap length of twenty-four (24) inches. Expansion joints
Revised ol'11 2o2l Section I\ Page 3 of II
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STREET PAVING
shall be placed at the end of each curb return, and at a maximum
spacing of fortv (40) feet with control joints no greater than ever,
ten (10) feet.
b Minimum stabilized subgrade thickness shall be six (6) inches.
2. For pavement widths greater than twenty-eight (28) feet from back of curb
to back of curb, or twenty-six (26) feet from edge of pavement to edge of
pavement, and for boulevard or major thoroughfare sections.
a. Minimum concrete slab thickness shall be seven (7) inches with an
fc equal to four thousand (4,000) psi. Reinforcement shall be
Grade 60, fv = 60,000 psi. 44 deformed reinforcing bars, spaced at
sixteen (16) inches center to center, both ways, and with minimum
lap length of twenty-four (24) inches. Expansion joints shall be
placed at the end of each curb return, at a maximum spacing of
fortv (40) feet on both residential and collector streets, boulevards,
and major thoroughfares, with control joints no greater than ever,
ten (10) feet.
b Minimum stabilized subgrade thickness shall be eight (8) inches.
3 For HXIAC pavements.
a. Minimum thickness shall be two (2) inches.
b Minimum subgrade thickness shall be eight (8) inches of stabilized
crushed concrete or limestone, and six (6) inches of lime -stabilized
subgrade.
D Subgrade Treatment: The geotechnical engineer shall base the depth of the
subgrade stabilization on the structural number (SN) in conjunction with
pavement thickness design. The following is general guidance for subgrade
treatment:
1 For subgrade soil conditions with a clay content of ten (10 0) percent or
higher, and a plasticity index (PI) of ten (10) or more, the subgrade shall
be stabilized with lime. Subgrade shall be stabilized with a minimum six
(6) percent lime by weight at required thickness, and compacted to ninety
five (95) percent standard Proctor density _alternative subgrade
stabilization may be substituted when specific recommendations are made
Revised of '11 2o2l Section I\ Page 4 of I I
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Engineering Department
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STREET PAVING
by the geoteclnnical engineer for the project, and when specifically
approved by the CAN, Engineer
2. For subgrade soil conditions containing clean sand with no clay content,
the subgrade shall be stabilized with cement.
E. Requirements for Intersections. Turnouts. Transitions, and Boulevards or
Thoroughfares.
1 At a 'T' intersection with a street that has not been improved to its
ultimate width, the concrete pavement shall be stopped either at the rights-
of-wav line, or the end of the curb return, whichever would require less
concrete removal at a future date.
2. For roadway turnouts placed at an existing street intersection, the turnout
shall be designed to fit the ultimate pavement width of the intersecting
cross street and then transitioned to the existing roadway
3 The transition length for meeting an open -ditch street, shall be fifty (50)
feet for street widths less than or equal to twenty-eight (28) feet from back
of curb to back of curb- seventy-five (75) feet for twenty-nine (29) feet to
fortv (40) feet from back of curb to back of curb- and one hundred (100)
feet for fortv-one (41) feet from back of curb to back of curb or greater
a. Streets other than concrete shall have transitions with a minimum
thickness of eight (8) inches of lime -stabilized subgrade, six (6)
inches of hot -mix asphaltic concrete base, or approved equal, with
two (2) inches of hot -mix asphaltic surfacing.
b Concrete streets shall have transitions with a minimum thickness
of six (6) inches of stabilized subgrade and six (6) inches of
concrete pavement.
4 When paving only one section of a proposed two -section thoroughfare or
boulevard (boulevard section), all left -turn lanes and esplanade crossovers
shall be paved to the centerline of the street right-of-wav
F Requirements for Ditches on Open -Ditch Streets.
1 Minimum grade on ditches shall be two -tenths (0.2) percent.
Revised ol'11 2o2l Section IA, Page 5 of 11
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STREET PAVING
2. Ditch capacity shall be designed to handle the stone water runoff as
determined within 'Section N — Stone Drainage section of this manual.
3 The maximum side slope shall not be steeper than three (3) horizontal to
one (1) vertical.
4 Culverts for roadside ditches only shall be designed to cam, the storm
water runoff, but shall not be less than eighteen (18) inch diameter pipe
constructed of reinforced concrete.
G. Requirements for Pavement on Curb -and -gutter Streets.
1 Inlet spacing:
a. Curb inlets shall be spaced and sized to intercept the calculated
storm water runoff for the design storm. The design water surface
elevation for the design storm flow at the inlet, shall be less than or
equal to the top of curb adjacent to the inlet.
b Maximum travel distance of water in the street from a high point to
a curb inlet shall be three hundred (300) feet on major
thoroughfares, boulevards, commercial streets and collector streets
unless otherwise approved by the CAN, Engineer The maximum
travel distance of water in the street from a high point to a curb
inlet pennitted on residential streets shall be three hundred (300)
feet unless otherwise approved by the CAN, Engineer
C. Maximum drop of grade tangents from opposite directions to a
common inlet shall be one and one-half (1.5) feet.
d. Curb inlets shall be located on the intersecting side street at an
intersection with a higher classification street. Location of curb
inlets required on a major thoroughfare, at intersections, shall be
specifically approved by the Citv Engineer
e. Baekfill around inlets below grade shall be one and one-half (1 5)
sacks per cubic vard of cement -stabilized sand, and to the top of
the first stage of inlet.
2. Design gutter grade shall be three -tenths (0 3) percent: if the gutter grade
is less than three -tenths (0 3) percent and approved by the Citv Engineer.
Revised of '11 2o2l Section I\ Page 6 of I I
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STREET PAVING
then the Citv Engineer shall determine the required inlet spacing. The
minimum acceptable gutter grade shall be two -tenths (0.2) percent.
3 Maximum cut from finished grade at propertv line to top of curb, shall be
one and three-quarters (1 75) feet.
4 Minimum grade shall be one (1.0) percent fall around intersection turnout
for a minimum radius of twenty-five (25) feet. Grades for larger radius
shall be determined on an individual basis.
5 N ertical curves shall be installed when algebraic differences in
intersecting grades exceed one (1 0) percent. Elevations shall be shown at
ten (10) foot intervals through vertical curves. Maintain a minimum of
three -hundredths (0.03) foot elevation change at ten (10) foot intervals by
altering the calculated elevations.
6 When a curb -and -gutter intersects a drainage ditch, the elevation of the
adjacent gutter shall be above the design water surface elevation in the
ditch.
7 Minimum gutter grade around a cul-de-sac shall be six -tenths (0 6)
percent.
8. Curves on major thoroughfares shall be superelevated in accordance with
_ ASHTO whenever the centerline radius of anv lane of pavement is less
than two thousand (2,000) feet.
9 The amount of cross slope over the pavement section shall be shown on
the drawings. The required cross slope shall be three -eighths (3, 8) inch
per foot from curb line to quarter point, and one -quarter (1 4) inch per foot
from quarter point to the center line, and one -quarter (1 4) inch per foot
for left -turn lanes.
10. A minimum grade of four -tenths (0 4) percent around the longest radius is
required on an L Tvpe street intersection.
11. When meeting an existing upright curbed street, top of new curb
elevations shall be designed to meet an elevation six (6) inches above the
existing gutter pavement, or gutters shall be matched and new top of six
(6) inch curb transitioned to top of existing curb At existing inlets, top of
new curb elevations shall be designed to match existing top of existing
inlets.
Revised ol'11 2o2l Section IA, Page 5 of 11
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Engineering Department
Design Criteria Manual
STREET PAVING
12. When the curb elevations are not established below the natural ground, fill
lines shall be shown on the drawings and shall be of sufficient height to
ensure a minimum of three -eighths (3/8) inch per foot transverse slope
toward the curb from the propertv line between a point, two (2) feet
outside the rights-of-wav and the top of curb If this tvpe of fill is
required, and the pavement is adjacent to a nonparticipating propertv
owner, fill easements from this propertv owner shall be obtained, filed,
and a copy of the easements shall accompanv the final drawings.
Construction of this nature will require back -slope drainage design to
prevent trapping stone water runoff.
13 Elevations and grades shall be labeled for all tops of curb Centerline
elevations and grades are acceptable for open -ditch sections only
H. Requirements for Inlets on Curb -and -gutter Streets.
1 Tvpe 'BB, with grate or plate tops, or type 'H-2' inlets, shall be used on
all curb -and -gutter streets depending on store water runoff requirements,
unless otherwise approved by the CAN, Engineer
2. Inlets shall be placed at the end of pavement in order to eliminate direct
drainage of store water from the pavement gutter into an open -ditch or
onto adjacent propertv
3 On open -ditch streets, place stub -outs with ring grates from inlets to
ditches.
1. Requirements for Curbs and Sidewalks.
1 For curbs located along the outside edges of residential streets, the
standard dimensions shall be four (4) inches tall and twelve (12) inches
wide. Curb height for streets other than residential shall be six (6) inches
tall. The curb height on all esplanades shall be six (6) inches.
2. Sidewalks are required as set out in Section III of the Subdivision
Ordinance and Section 70-64 of the Code of Ordinances. Where
sidewalks are required, they shall have a minimum width of four (4) feet,
except on TxDOT rights-of-wav where the minimum width shall be five
(5) feet.
Revised ol'11'2o2l Section I\ Page 6ofII
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STREET PAVING
3 Sidewalk wheelchair ramps shall be required at all intersections, and at or
through all driveways where required. The design and installation of such
ramps shall comply with Texas Accessibilitv Standards Architectural
Barriers requirements.
4 All sidewalks shall be constructed in accordance with the Citv of
Friendswood Standard Details, including through all driveways where
required. The design and installation of such sidewalks shall comply with
the Texas Accessibilitv Standards Architectural Barriers requirements.
5 The location of all proposed and existing sidewalks shall be shown on the
construction drawings.
J Requirements for Miscellaneous Items.
1 The tvpe and amount of subgrade treatment shall be shown on the
drawings.
2. Paving headers shall be placed at the end of all concrete pavements.
3 All concrete to be removed, shall be saw cut one half of the pavement
depth before removal.
4 Sight distance requirements shall be based on the latest version of the
AASHTO design practices.
5 Standard Citv of Friendswood barricades shall be placed at the end of all
dead-end streets not terminating in a cul-de-sac.
6 The appropriate drainage agenev approval shall be obtained before Citv
approval is granted if the design involves a drainage wav or other drainage
facility
7 A letter of agreement from the affected pipeline companv(s) is required
when anv paving is placed over a transmission pipeline or anv utility line
is placed over or under such lines.
8. When new concrete pavement meets existing concrete pavement,
horizontal dowels shall be used if no exposed reinforcing steel for
interconnection with new pavement exists. Horizontal dowels shall be
Grade 60, smooth dowel bars, twenty-four (24) inches long, drilled and
embedded twelve (12) inches into the center of the existing slab and
Revised ol'11 2o2l Section I\ Page 7 of II
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STREET PAVING
epoxied. Dowels shall be spaced at sixteen (16) inches center to center,
unless otherwise specified. Concrete slab thickness shall be at least
matching the existing slab thickness, and be a high strength early vield
with fc — 5 000 psi.
9 Dead-end streets or ends of concrete streets designed to be extended in the
future shall have paving headers and twelve (12) inches of reinforcing
steel exposed beyond the pavement, coated with asphalt and wrapped with
burlap, or shall have paving headers and dowel tvpe expansion joint for
future pavement tie-in.
10. Pavement extensions shall connect to the existing pavement as shown on
the Citv of Friendswood Standard Details.
11. A design for concrete pavement thickness is required for all pavements
within industrial areas and on major thoroughfares. Concrete pavement
thickness design shall be based on the latest version of the _ ASHTO
design procedures for rigid pavements.
12. The pavement structure for each roadway shall be designed based on soil
data from the site, and based on the anticipated traffic volume, loading,
and service life of the proposed pavement structure. The design engineer
is responsible for ensuring that the pavement structure is designed to
withstand the anticipated loads on the roadway
105 APPURTENANCES — Reserved
106 SUBXIITTALS — Reserved
107 QtTALIT1 _ASSURANCE
A. All construction drawings and specifications shall be prepared by or under the
supervision of a Professional Engineer licensed to practice engineering in the
State of Texas, and all documents shall be sealed, dated, and signed by the
engineer responsible for their preparation along with their firm s registration
information.
B. All geotechnical testing, environmental, and similar services for design and
testing shall be performed by or under the supervision of a Professional Engineer
licensed to practice engineering in the State of Texas, and trained in the science of
soil analysis. All design and testing reports and documents shall be sealed, dated.
Revised ol'11 2o2l Section I\ Page 8 of 11
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Engineering Department
Design Criteria Manual
STREET PAVING
and signed by the engineer responsible for their preparation along with their
firm s registration information.
2.0 EXECUTION
2.01 RESEARCH REQtTIREDIENTS
A. Research existing utilitv and right-of-wav information.
B. N erifv that no restrictions exist that will dery approval of the propertv concept.
2.02 DESIGN ANALYSIS
A. All pavement design shall be supported by calculations to establish the required
thickness and reinforcement.
B. The appropriate geotechnical soils report shall be the basis for design considering
the use, loading, and life span of the proposed pavement.
C All drainage improvements shall be designed to accommodate the anticipated
stone runoff.
2.03 DRAWINGS
A. Construction drawings shall be prepared in compliance with the Citv of
Friendswood Design Criteria Manual, Section I — Graphic and Design
Requirements.
B. Refer to The Citv of Friendswood Design Criteria Manual. _appendix B. Figure 1
'Geometric Street Design Standards for additional information and guidance.
Revised of '11 2o2l Section I\ Page 9 of I I
City of Friendswood
Engineering Department
SECTION V
STORM DRAINAGE DESIGN REQUIREMENTS
1.0 GENERAL
Design Criteria Manual
STORM DRAINAGE
A. Should anv portion of this Section conflict with anv provisions of the Subdivision
Ordinance, Zoning Ordinance, the Galveston Countv Consolidated Drainage District
or the Harris Countv Flood Control District, the more stringent of the latter four (4)
will govern.
B. The Citv Engineer shall have the final interpretation of anv provisions in this Design
Criteria Manual.
C The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
101 CHAPTER INCLUDES
Criteria for the design of store drainage improvements.
102 REFERENCES
A. City of Friendswood Standard Details and Technical Specifications, latest version.
These can be downloaded from www.friendswood.convpublications.
B. City of Friendswood Flood Damage Prevention Ordinance, Chapter 34 of the Code
of Ordinances, and anv subsequent revisions.
C Galveston Countv Consolidated Drainage District Criteria Manual, the latest version.
D Harris Countv Flood Control District Hydrology and Hvdraulics Guidance Manual.
Updated June 2019
E. Tl DOT Hvdraulie Design Manual, the latest edition.
F _alas 14 Rainfall Depths for Galveston Countv Consolidated Drainage District
10/2019
G. Harris Countv'City of Friendswood Memorandum of Understanding regarding
maintenance of Harris Countv Hvdraulie and Hydrologic models.
Revised ol'11 2o2l Section \ Page l of 34
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
H. Harris Countv Flood Control District Policv Criteria and Procedure Manual. Includes
Revisions to Chapters 2, 3 6. 7 & 8 from Interim Guidelines and Criteria for _alas 14
Implementation revised Julv 2019
Harris Countv Recommendation on Minimum Standards for Communities in Harris
Countv and Draining to Harris Countv Mav 12, 2020
National Oceanic and Atmospheric Administration (NOAA) _alas 14
Precipitation — Frequencv _alas of the United States. N olume 11 N ersion 2.0- Texas.
(_alas 14).
K. Kronkoskv Blake, Gauge Engineering. _alas 14 Rainfall Depths for Galveston
Countv Consolidated Drainage District, October 2019
L. Federal Emergencv Management Agencv Flood Insurance Studv Galveston Countv
Texas and Incorporated Areas, August 15 2019
103 DEFINITIONS
A. Acceptance Procedures — For projects in Galveston Countv the Galveston Countv
Consolidated Drainage District must accept and approve all detention ponds or other
drainage facilities entering their system before the Citv of Friendswood accepts the
infrastructure. The acceptance of the facility shall be placed on the next available
Board agenda for approval and acceptance subject to the contractor s one (1) vear
maintenance period. For projects in Harris Countv the Harris Countv Flood Control
District will accept and approve all detention ponds or other drainage facilities
entering their system as applicable.
B. Conduit — anv open or closed device for conveving stone water
C Development — anv matmiade change in improved and unimproved real estate,
including, but not limited to, buildings or other structures, mining, dredging, filling,
grading, paving, excavation or drilling operations.
D Drainage Area Map — Area map of a watershed which is subdivided to show each
area served by each subsystem.
E. Design requirements — The drainage criteria developed by the Citv of Friendswood,
and complemented by those of the Galveston Countv Consolidated Drainage District
and the Harris Countv Flood Control District, are intended to provide design
guidelines for protection of all areas of the Citv from structural flooding resulting
from a one hundred (100) vear stone event. This is accomplished with the
application of various drainage enhancements such as stone sewers, roadside ditches.
Revised ol'1l'_'n_l Section \, Page 2 of 34
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
open channels, detention, and sheet flow runoff. The combined system is intended to
prevent structural flooding from extreme events up to a one hundred (100) year
store: all development must account for the one hundred (100) year store event as
further detailed in this Section. In order to meet this requirement all standards in the
Harris Countv Recommendation on Minimum Standards for Communities in Harris
Countv and Drainage to Harris Countv letter released Mav 12, 2020 must be met.
F FENIA — Federal Emergency Management Agencv
G. Flood Control — The Citv of Friendswood is a participant in the National Flood
Insurance Program. The intent of the flood insurance program is to make insurance
available at a reasonable cost by providing for measures that may reduce the
likelihood of structural flooding.
H. GCCDD — Galveston Countv Consolidated Drainage District.
HCFCD — Harris Countv Flood Control District.
Hvdraulie Grade Line — A line representing the pressure head available at anv given
point within the drainage system.
K. In -Fill Development — Development of open tracts of land in areas where the store
drainage infrastructure is alreadv in place and takes advantage of the existing
infrastructure as a drainage outlet.
L. Public store sewers — Defined as sewers and appurtenances that provide drainage for
public rights-of-wav more than one private tract, and are located in public rights -of
wav or drainage easements.
M. Private store sewers — Defined as sewers and appurtenances that provide drainage
for a private development, one or more than one private tract, and are located in
private drainage easements.
N Rainfall frequency — Probability of a rainfall event defined by a percent chance of
occurring in anv given vear Information on rainfall frequency is published by the
National Oceanic and Atmospheric Administration. The Citv uses the _alas 14 Point
Precipitation rainfall depths. For the purpose ofstomn drainage design, the following
frequencies are applicable
Five (5) `-ear frequency — a rainfall intensity having a twenty (20) percent
probabilitv of occurrence in anv given vear or nominally likely to occur once
ever, five (5) rears.
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
2. Ten (10) vear frequency — a rainfall intensity having a ten (10) percent
probabilitv of occurrence in anv given vear or nominally likely to occur once
ever, ten (10) vears.
3 Twenty-five (25) vear frequenev — a rainfall intensity having a four (4)
percent probabilitv of occurrence in anv given vear or nominally likely to
occur ever, twenty-five (25) vears.
4 One hundred (100) vear frequenev — a rainfall intensity having a one (1)
percent probabilitv of occurrence in anv given vear or nominally likely to
occur ever, one hundred (100) years.
O Relationship to the Platting Process — Approval and review of stone drainage is a
part of the review process for planning and platting of new developments. The
review of stone drainage is overseen by the Communitv Development Department,
Public Works Department, Engineering Department and the Galveston Countv
Consolidated Drainage District (when development occurs within Galveston
Countv).
P Sheet Flow — Overland stone water run-off that is not conveved in a defined conduit.
Q Stone Sewer— Stone sewers and roadside ditch conduits are designed as a balance of
capacity and economics. These conduits are designed to convev less intense, more
frequent rainfalls with the intent of allowing for traffic movement on streets during
these events.
R. Street Drainage — When rainfall events exceed the capacity of stone sewer systems,
the additional runoff is intended to be stored, detained, or eonveved overland in a
manner that reduces the threat of flooding to structures. Street ponding of a short
duration is anticipated and street drainage is designed accordinglvto contribute to the
overall capability of the drainage system.
104 DESIGN REQtTIREDIENTS
All designs of drainage facilities shall meet the requirements of the Citv of Friendswood
Standard Details and Technical Specifications.
A. Deteraination of Runoff
Design Storrs Events — All drainage improvements shall be designed for the
following store frequencies based on _alas 14-point rainfall as established by the
National Oceanic and Atmospheric Administration for Harris Countv Region III.
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City of Friendswood
Engineering Department
Tvne of Facility
Road Side Ditch
Stone Sewers
Channels, Stone Sewers; Culverts draining
One hundred (100) acres or less
Creeks; Channels/Culverts draining
One hundred (100) acres or more
Design Criteria Manual
STORM DRAINAGE
Frequency
five (5) rear
five (5) rear
twenty-five (25) vear
one hundred (100) vear
*All City or District maintained facilities shall be designed for the 100-vear stone
independent of the amount of acreage served.
B. The Rational Method shall be used for determining the peak flow rate in the sizing of
all drainage improvements.
1 Time of Concentration (in minutes) is the time required for peak runoff, from
the entire upstream contributing area, to reach the point of interest. Time of
concentration can be calculated based upon an analysis of the actual travel
time from the most remote point in the drainage area. The travel path should
be clearly denoted and a sketch included in the design calculations.
to = D/60` + 10 (minutes)
D = flow distance (ft)
N = flow velocity (ft, sec)
For purposes of calculating tc, the following velocities are recommended.
= 1 ft, sec for overland flow
= 1 5 ft, sec for flow across paved surfaces or along gutter flowlines.
N = 2 ft, sec for flow in a ditch or channel
N = 3 ft, sec for flow in a storm sewer
2. Rainfall hntensity (inches, hour) shall be calculated using the following
formula:
I = b
(d + toe
b, d, and e values are derived from a single frequency rainfall intensity graph.
b = the N-intercept of the straight line
d = a constant used to adjust the relationship to plot as a straight line
e = the slope of the straight line
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
Allowable N alues for Friendswood are listed below
t, = 60 min
Rainfall
Fre uene l
b
d
e
3-vear
51.4
8.1
0.705
5-vear
46.6
70
0.656
10-vear
51.9
6 5
0.647
25-vear
61.5
64
0.644
50-vear
67.9
61
0.640
100-vear
76.2
6.2
0.641
t, 60 min
Rainfall
Freuene l
b
d
e
3-vear
69.9
11.9
0.768
5-vear
86.1
194
0.775
10-vear
1103
30.9
0.776
25-vear
1540
475
0.783
50-vear
211 5
677
0.798
100-vear
318.6
960
0.826
3 The Rational Method is a method for calculating the peak flow rate for a
stone drain system. The fortnula for determining the peak flow rate is.
Q=CfCIA
Where:
Q = Flow rate (cubic feet per second (cfs))
Cf— Frequency factor, the product of Cf and C should not exceed 1.0
C = Runoff Coefficient
I = Rainfall intensity (inches hour) for a given stone frequency
(Tvpieally 5 vear. 25 vear, and 100 vear).
A = Area (acres)
For the purposes of peak flow calculations, use the following 'Cf
Cf = 100, for stone frequencies of 10 vears or less
Cf = 1 10, for stone frequencies of 25 vears
Cf= 1.25 for stone frequencies of 100 vears
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
For the purposes of peak flow calculations, use the following runoff
coefficient 'C which are in no wav related to the lot coverage percentage as
defined in the Zoning Ordinance.
Land Use Type
Run-off Coefficient
Raw Undeveloped Acres
0.20
Improved Undeveloped Acres
(i.e. mowed, filled, re -graded, etc.)
0.30
Parkland
0.40
Residential.
SFR Estates = 1 acre
0.45
SFR 1 acre
0.55
ulti-family
0.85
Commercial,' Industrial
0.90
Pond detention and amenity
1.00
Altermtively for estate -sized lots [greater than two (2.0) acres], the runoff
coefficient 'C in the Rational Method foraula can be calculated from the
equation.
C = 0.6Ia + 0.2
Where:
C = watershed coefficient
Ia = impervious area'total area
If the alternate fora is to be submitted, the calculation of the runoff
coefficient 'C shall be provided as part of the drainage calculations.
C Design of store sewers
1 Design Frequenev
a. Areas of New Development
The design store event for sizing store sewers for new development
areas shall be a five (5) rear store. In anv case where new
development interferes with the natural sheet flow of the existing
adjacent land, the storm system shall accommodate the runoff.
Stubbed out streets next to undeveloped areas shall have store sewer
lines continuing to an approved outfall.
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b In -fill Development
1) Ati existing stone sewer and structures shall be evaluated
using a five (5) rear stone, assuming no development takes
place. The stone sewer and structures shall then be evaluated
with the development in place.
a) If the proposed development has a lower or equal
impervious cover, no modifications to the existing
stone sewer system are required.
b) If the hvdraulie gradient of the existing stone drain is
below the top of the curb, no improvements to the
existing stone sewer system are required.
C. Private Drainage Svstems
1) Stone sewers for private drainage systems shall conform to
the CAN, of Friendswood Technical Specifications and
Standards Details for public drainage systems. Minimum
diameter pipe for a private stone sewer system is ten (10)
inches.
a) Unless otherwise approved by the Citv Engineer, all
private drainage systems shall be constructed in
conformance with the public stone sewer standards.
b) An approved pennit shall be obtained from the CAN,
before anv work shall be done on a private drainage
system and shall include plan and profile sheets
detailing the scope of the work, with elevations.
c) Open ditch areas may be converted into storm sewer
lines with the approval of a Development Pennit and
Specifications for Residential Storm Sewer
Installation Specification Form. Guidelines for the
process are defined in Appendix F of this Design
Criteria Manual.
d) Private storm sewer connections to public storm
sewers shall occur at a manhole, or at the back of an
inlet, as approved by the Citv Engineer
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City of Friendswood
Engineering Department
2. Pipe N elocity and Slope Design
Design Criteria Manual
STORM DRAINAGE
a. All storm drains shall be designed by the application of Manning s
Equation and the Continuitv Equation.
Manning's Equation.
N=(1486in)R2,'3S1'2
Where
N = velocity (ft sec)
R = hvdraulie radius (area in square feet wetted perimeter in feet)
S = slope of energy line in feet feet (sauce as conduit bottom
slopes for uniform flow)
n = coefficient of roughness
n = 0 013 for concrete pipes.
n = 0 024 for CMP (Corrugated Metal Pipe)
n = 0 011 for PN C (Polvvinvl Chloride)
n = 0 010 for HDPE (High Densitv Polvethvlene)
*Note. .111 piibhe storm seu eis ii7 or on piubhe nghts-of-u ar andPubhe drau7age
easements shall be consbneted of RCP (Reinforced Concrete Pipe) 1117less
othenvise approved by the Crh, Engineer illanning s roughness coefficients for
CAIP PT -C and HDPE shall be used,for stoini sewers on pnvate pi operh, oi7h'.
CAIP Pipes shall be user, forpubhe storni sewers onh, upon specific approval ofthe
CavEngineerand orthe applicable drainage distnetentin, (GCCDD orHCFCD).
Continuitv Equation.
Q= NA
Where
Q = discharge (cfs)
N = velocity (ft sec)
A = wetted cross sectional area of conduit (A2)
b Design velocities shall be three (3) feet per second with the pipe
flowing full.
C. Maximum velocities shall not exceed seven (7) feet per second
without the approval of the Citv Engineer
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City of Friendswood
Engineering Department
d.
e
Design Criteria Manual
STORM DRAINAGE
Minimum Public Storm Sewer Pipe Slopes.
Pipe Diameter
°o Slope
18' *
0.26
24'
0.18
30'
0.14
36'
0.11
42'
0.08
48'
0.07
54'
0.06
60'
0.05
*Used for hilet leads only
For pipe sizes not listed above, the minimum slope shall be
determined utilizing a design velocity of three (3) feet per second.
3 Pipe Sizes and Placement
a. Public storm sewer lines and inlet leads shall be a minimum of
twenty-four (24) inch inside diameter and eighteen (18) inch inside
diameter, respectively or equivalent. Box culverts shall be at least
two (2) feet x two (2) feet inside dimension.
b Larger pipes located upstream shall not flow downstream into smaller
pipes unless it is intended for detention requirements.
C. Match crowns of pipe at anv size change unless severe depth
constraints prohibit such, or engineering calculations show flowlines
should be matched.
d. Locate public storm sewers in public street rights-of-wav in parallel
and adjoining easements, or in other approved easements. Easements
shall be at least twenty (20) feet wide, and the storm sewer shall be
centered in the easement.
4 Starting Water Surface and Hydraulic Gradient
a. The hydraulic gradient shall be calculated assuming the top of the
outfall pipe as the starting water surface.
b At drops in pipe flowline, should the upstream pipe be higherthanthe
hydraulic grade line, the hydraulic grade line shall be re -calculated
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
assuming the starting water surface to be at the top of pipe at that
point.
C. For the design stone, the hydraulic gradient shall at all times be
below the gutter line elevations at anv point along the street.
d. Hvdraulie grade lines shall be shown on all profile drawings.
5 Manhole Locations
Manholes are required at the following locations.
a. Size or cross section changes.
b Inlet lead and conduit intersections.
C. Changes in pipe grade.
d. Street intersections.
e. A maximum spacing of six hundred (600) feet measured along the
conduit nun.
f. Manholes shall not be placed or located in drivewav or sidewalk
areas.
g. Adjust manhole frames and covers within the limits of the pavement
to meet the proposed final top of slab
6 Inlets
a. Locate inlets at all low points in gutter
b N allev gutters across intersections are not pennitted.
C. Inlet spacing is generally a function of gutter slope. For minimum
gutter slopes of three -tenths (0 3) percent, the maximum spacing of
inlets shall result from a maximum gutter nun of three hundred (300)
feet from a high point in the pavement to an inlet on a continuously
graded street section, for a maximum spacing of six hundred (600)
feet between inlets.
Revised ol'11 2o2l Section \ Page I I of 34
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Engineering Department
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STORM DRAINAGE
d. If gutter slopes are less than three -tenths (0 3) percent, the Citv
Engineer shall determine the inlet spacing. The acceptable minimum
gutter grade is two -tenths (0.2) percent.
e.
f.
2
Use only Standard Inlets.
Inlet
Application
Capacity
Type A
Parkin Lots, Small Areas
2.5 cfs
Type B-B
Residential
5 0 efs
Type D
parking Lots
2.0 cfs
Type E
Roadside ditches
20 0 cfs
Type H-2
Residential Commercial
5 0 cfs
Do not use 'Beehive' stvle grate inlets or other specialty inlets.
Do not use grate top inlets in an unlined roadside ditch.
h. Place inlets at the end of curb returns on side streets, when such
streets intersect streets of a higher classification, unless special
conditions warrant otherwise and are approved by the CAN, Engineer
i. Storu sewer inlets shall be established in such numbers and in such
locations as to effectively drain store water from paved sections. A
graphical plan and calculations of the hydraulic gradient shall be
furnished by the design engineer
D Consideration of Overland Flow
1 Design Frequency —the design frequency for consideration of overland sheet
flow shall consider extreme store events which exceed the capacity of the
underground store sewer system resulting in ponding and overland sheet
flow through the development to the primary drainage outlet.
2. Relationship of Structures to Street — all structures shall be constructed as per
the Flood Damage Prevention Ordinance, and shall be higherthan the highest
level of ponding resulting from the extreme store event as shown on the
latest CAN, adopted flood maps.
3 Calculation of Flow
a. Streets will be designed so that consecutive high points in the street
will provide for a gravitv flow of drainage to the ultimate outlet.
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Engineering Department
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STORM DRAINAGE
b The maximum depth of ponding at high points will be the top of curb
of streets with curbs, or the elevation of the centerline of roads
without curbs.
C. The maximum depth of ponding at low points will be nine (9) inches
above the gutter elevation of curb of streets with curbs, or three (3)
inches above the elevation of the centerline of streets without curbs.
d. Sheet flow between lots can be provided only through a defined
drainage easement.
e. A map shall be provided to delineate the flow direction of the
extreme event through a proposed development, and how this flow is
discharged to the primary drainage outlet.
f. In areas where ponding occurs and no sheet flow path exists, a
calculation shall be provided to show that runoff from the one
hundred (100) year event can be conveved and remain in compliance
with the other terns of this Section.
4 Overland flow shall enter outfall drainage facilities (channels or detention
ponds) through a store sewer with its last nun sized to eonvev the one
hundred (100) year event. Calculations shall be submitted for sizing the
structure and determining that adequate inlet capacity exists.
5 Maintain pre-existing natural overland flow of store water, and provide
protection for adjacent properties from redirected store water flows.
6 For development greater than five (5) acres, show contours of adjacent
properties within two hundred (200) feet, and account for natural and existing
overland flow or ehannelized flows. For developments less than five (5)
acres, show contours of adjacent properties within fifty (50) feet, and account
for natural and existing overland flow or ehannelized flows. Contour lines
shall provide an indication on whether or not adjacent off -site areas drain
toward or away from the subject tract.
E. Design of Open Channels
1 Design Frequenev
a. Open channels shall be designed according to methods described in
the Galveston Countv Consolidated Drainage District (GCCDD) and
Harris Countv Flood Control District (HCFCD) Criteria Manuals.
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
b Design standards for channel construction shall follow the
requirements specified in the GCCDD & HCFCD Criteria Manuals.
C. Design standards for the outfalls into channels shall conform to those
in the GCCDD & HCFCD Criteria Manuals.
2. Determination of Water Surface Elevations.
a. Water surface elevations shall be calculated using Manning's
Equation and the Continuitv equation.
b For the design storm event, the water surface for ditches and channels
shall be calculated to remain within the banks and at or below the
required freeboard.
3 Design of Culverts
Head losses in culverts shall conform to TxDOT Hydraulics Manual, Chapter
84 — Culverts.
F Design of Roadside Ditches
1 Design Frequenev
a. Roadside ditches are pennissible only for single family residential
lots having widths larger than, or equal to, one hundred twenty (120)
feet.
b Design storm event for a roadside ditch shall provide one-half (0 5)
foot of freeboard below the edge of pavement, or the natural ground
at the rights-of-wav line, whichever is lower
C. The design must include an extreme event analvsis to indicate that
adjoining structures will not be flooded.
2. N eloeity Considerations
a. For grass lined sections, the design velocity shall be two (2.0) feet per
second during the design stone event. The maximum velocity shall
be five (5) feet per second.
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Engineering Department
Design Criteria Manual
STORM DRAINAGE
b A grass lined or unimproved roadside ditch shall have side slopes no
steeper than three (3) horizontal to one (1) vertical.
C. Minimum grades for roadside ditches shall be two -tenths (0.2)
percent.
d. Calculation of velocity shall use a Manning's roughness coefficient of
four hundredths (0 04) for earthen sections, and twenty-five
hundredths (0 025) for ditches with paved inverts.
e. Use erosion control methods acceptable to the Citv when design
velocities are calculated to be greater than three (3) feet per second
and are approved by the Citv Engineer
3 Culverts
a. Culverts shall be placed at all drivewav and roadway crossings and
other locations where appropriate.
b Culverts shall be designed assuming inlet control.
C. Roadside culverts shall be sized based on drainage area. Calculations
shall provide for each block based on drainage design criteria
presented in this manual.
d. Cross open channels with roadside culverts no smaller than eighteen
(18) inch diameter or equivalent. The size of culvert used shall not
create a head loss of more than two -tenths (0.2) feet greater than the
normal water surface profile without the culvert.
e. Use erosion control methods acceptable to the Citv when design
velocities are calculated to be greater than three (3) feet per second
and approved by the Citv Engineer
f. Sloped End Treatments (S.E.T s) are required on all TxDOT
Highways.
4 Depth and Size Limitations for Open Ditches
a. Residential streets — the maximum depth shall not exceed two and
one-half (2.5) feet below the edge of pavement.
b Roadside ditch bottoms shall be at least two (2) feet wide.
Revised ol'11 2o2l Section \, Page 15 of 34
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Engineering Department
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STORM DRAINAGE
Ditches in adjoining and parallel easements shall have the top of bank
not less than two (2) feet from the outside easement line or edge of
pavement when applicable.
d. Roadside ditch side slopes shall not exeeedthree (3) horizontal to one
(1) vertical.
The design stone event for a roadside ditch shall provide one-half
(0 5) foot of freeboard below the edge of pavement, or the natural
ground at the rights-of-wav line, whichever is lower
G. Design of Outfalls.
Outfall design shall eonforn to GCCDD and HCFCD standards as
applicable.
2. Detention pond and stone sewer outfalls shall be placed one foot above the
flowline of the receiving channels, creeks, and detention pond, or two foot
above normal water elevation, whichever is greater
Flowlines of store sewer outfalls shall be located six (6) inches above the
flowline of a receiving roadside ditch.
H. Store Water Detention
Application of Detention.
a. As a nornal consideration, store water detention shall be required.
The use of on -site detention is required in order to mitigate potential
damage to existing structures unless. the current infrastructure has
been improved and provides mitigation forthe development, the Citv
has developed a plan for a detention facility to serve the overall area,
the development is within an existing subdivision served by a
detention facility that is within the platted boundaries of said
subdivision and that has been previously accepted and approved by
the City and the GCCDD or a development qualifies for the purchase
of regional detention under certain circumstances enumerated in
1 04.H.8.
Design calculations for sizing the detention basin and related
structures shall be performed by the applicable method described in
the following sections.
Revised of '11 2o2l Section \ Page 16 of 34
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Engineering Department
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STORM DRAINAGE
All calculations shall be sealed and signed by a Professional Engineer
licensed to practice engineering in the State of Texas.
d. All commercial and non-residential new developments, additions, or
redevelopments will require a new or revised drainage plan for
additional impervious cover The standard minimum rate of
detention referenced in paragraph 2 below will applv to this
impervious cover
A parking lot with a curb may be used as part of the detention system,
provided that the maximum depth of water over the inlet throat flow
line does not exceed nine (9) inches, and the maximum depth in anv
Parking stall does not exceed six (6) inches.
2. Calculation of Detention volume using the Hydrologic Method for
Projects of fifty (50) acres or less.
a. Minimum Rate of Detention for Projects of fifty (50) acres or less.
When using anv of the methods detailed below for calculating the required
amount of detention, the minimum amount of detention provided shall
never be less that the following standard minimum rates as follows.
For the purpose of determining the standard minimum rate, all the acreage
used in the calculation must include proposed or existing development.
Rawundeveloped acreage may not be included in the calculation to lower
the standard minimum rate.
1) Commercial Projects — Defined as projects with ninety (90)
percent or more impervious cover or a runoff coefficient of
nine -tenths (0.9) or larger — Standard minimum rate of six
tenths (0 6) ac.ft. per acre.
2) Multi-Fatmily Projects — Defined as projects with eighty
(80) percent or more impervious cover or a runoff
coefficient of eight -tenths (0.8) or larger — Standard
minimum detention rate fifty -five -hundredths (0 55) ae.ft.
per acre.
3) Residential Projects — Defined as projects with fortv (40)
percent or more impervious cover or runoff coefficient of
Revised of '11 2o2l Section \ Page 17 of 34
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Engineering Department
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STORM DRAINAGE
fifty -five -hundredths (0.55) or larger — Standard minimum
detention rate of fifty-five hundredths ( 55) ac.ft. per acre.
4) Estate Lot Projects — Defined as projects with less than
fortv (40) percent impervious cover or a runoff coeffieicent
less than fifty -five -hundredths (0 55) —Standard minimum
detention rate of fifty-five hundredths ( 55) ac. ft. per acre.
5) Mixed Use Projects — The Standard minimum rate of
detention shall be determined based upon weighted average
of the minimum rates set forth above.
6) Single family residential and accessory buildings on
existing lots and developments under one (1) acre do not
have a minimum detention requirement.
b. Modified Rational Method.
The modified rational method may be used to determine detention
storage for all projects less than five (5) acres.
Simplified Method
For projects less than five (5) acres, the standard minimum rate
may be used in lieu of performing a more complex analysis. This
coefficient multiplied by the total acreage will vield the total
detention volume required.
d. Optional Detention Storage Methodology for Projects of one fifty
(50) acres or less.
The maximum allowable release rate from the detention facility
during the one hundred (100) year storm event is the one hundred
(100) year peak flow rate from the area under pre -development
conditions. The undeveloped peak flow rate shall be determined
using the rational method.
The following method will be acceptable for determining storage
volume if the simplified method is not utilized.
e. Triangular Hvdrograph Method for projects fifty (50) acres or less
The volume of storage required may be computed as follows.
Revised ol'11 2o2l Section \ Page IS of 34
City of Pmvdsvootl DeagoCn n,Meemel
Pv®�eewgDepertmeN 9TORMDRAMACP
43560 V
8=
0.5
0.SBU 0)
S 43560
Mere
R Duano fmflow(sek
V Totalmflow olum i c-ft(24h durano ve s SCS
Cons Number)
S Required storage volume(amft)
I Peakinflowat (cfs)
O Peak utflow at (cis)
f U it Hectograph Metric (Small Watershed Metric) maybe sedfo
projects wN, drainage areas between 0 areand 100 acres a
techniqu developed by D HR Malcom may ItNized
determininginflowhydrogaph a maximuminflowrat hallb
determ edby s fin ational formal Whin peak flow and
olum f unotf in quation presented below may It sed t
determine the inflow hydrogaph for the proposed detention facility
Th marumallowabl ulflowatefromtlr detenno fa htyshall
Itced in mg flow at from in ndeveloped train
Outflow orhol hallb degnedfo in 5Uear 25- year and 100
year storm frequencies In cases where the outfall for the detention
fa lity t It x long oad d ditch torn ewer t in
allowabl inflow at may eed t It esticted t les than in
maximum allowabl verloadth ufall
Whet
T Tim t peaki econd
V Total volume of runoff for the design stormN)
Q Peakanofffo in de g toem (cis)
V=Or A (!"ten
Whet
Dr Runoff Depth (m)
Re d 0111112021 9ecfio V Pege19 f34
City of Pmvdsvootl DeagoCn n,Id,,,d
EvgiyeewgDepertmeN STORMORAINAGE
A Runoff Area (acres)
2 q = e [1—Cos (r`')] [q<1.25T ]
*Not a argumen fth o n tune o how abov
must It xpressedi adian
Mere
t. Time oflnterest(sec)
qu=Runoff at Tim flntere (cis)
3 q� = 4.34Qee T [t > 1.25T
*Not a argument fth o funcuo show boy
must It xpressedi adlan
4 T TE Tim Interval
3 Detentio Storag Methodology for Project ve 50 are
To dr nag area ve 50 ere del ledhydrauli analy tihzmgin
effective FELIA models will use as a minimum TIED HMS v.3.2 and HEC
RAS 30(o mor unent er on)forwindow Th methodologyals
apple t propertie ut ftact f50 ere r mor ADr ag Impact
Assessmen epor will It equ ed del 1 11 de g ssump on and
parameter
Watershed Modeling Methodology
1 For HEC HMS watershed analy in following parameter hallb
sed
Los Method Gree andAmpt
Trayform Method QarkU Hectograph
InitlalLos 0.1Done
Moisture Deficit 0385
Sue on 12451 the
Conductivity 0.0241 chesmon
Pvxmt Imperviou Cover
Re d O1AM021 9ecfio V Pege20 f34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
Land Use
Percent Imperious
Water
100
Isolated Transportation
90
High Density
85
Light Industrial
60
Airport
50
Residential Small Lot
40
Residential Large Lot
20
Development Green Acres
15
Residential Rural Lot
5
Undeveloped
0
Unknown
0
Atlas 14 Annual Exceedance Probability Rainfall Data (Inches) Region III
Duration
3-I ear
5-I ear
10-I ear
25-I ear
100-I ear
5-min
0.7
08
0.9
1.1
14
15-min
1.4
150
18
2.1
2.7
30-min
2.0
2.2
2.5
30
3 8
1-hr
2.6
2.9
34
4.1
5.2
2-hr
33
38
45
56
75
3-hr
3 7
43
5.2
6.6
9.2
6-hr
4.5
1 5.2
1 6 5
1 8.4
12.2
12-hr
5 3
6.2
78
10.2
15 0
24-hr
6.2
73
9.2
12.1
17.9
2. Indicate on a map drawn to scale the existing and proposed watershed
areas. All major features such as major roads and drainage entries shall
be indicated. Node locations shall be provided in the base model with
corresponding nodes at identical points in the model for the proposed
system.
3 The model shall include the 5-rear. 25-vear and 100-year pre
development and post development runoff analysis. If a proposed
development is to be constructed in phases, the analvsis should address
anv intennediate developed conditions.
4 When time series data or pared data are used in the model, briefly discuss
the source of the data in the report or show the calculations. Whenever
possible, provide a copy of the calculations, source and model files via
file sharing or on an external thumb drive.
Revised ol'11''o2l Section \ Page 21 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
5 Time of concentration and storage coefficients shall be calculated as
outlined in HCFCD and GCCDD methodology
6 If a different model than the FENIA effective hydraulic model is utilized,
written justification must be provided, and approval granted by the Citv
prior to beginning. At a minimum HEC HMS v 3.2 shall be used.
b Water Surface Profile Modeling
1 Water surface profile models shall be created using as a minimum
HEC RAS v 3 13 (or more current version) for windows. Alternative
approaches to modeling shall be discussed with the Citv prior to
commencing the study
2. The use of one-dimensional steadv flow and unsteady flow approach
may be utilized with proper justification.
3 Provide information and data for the base model which must be
included in the report. If the base model is different than the FENIA
effective model, written justification must be provided, and approval
granted before modeling commences. Base models shall be updated
using HEC RAS v 3 1.3 (or more current version).
4 Provide a plan view schematic for the existing and proposed systems.
The schematics shall indicate channel designations, node labels and
river stations. The river stations and node label so the existing model
shall match anv identical points on the proposed models whenever
possible. Plnvsical reference points shall also be used.
5 All models shall include the 5-vear. 25-vear and 100-year pre
development and post development runoff analysis. If a proposed
development is to be constructed in phases, the analysis should address
anv intermediate development conditions. Proposed bridge and, or
culvert crossing analyses shall include an extreme event.
6 For anv steadv flow or unsteady flow data used in the model(s), briefly
explain bow the data was calculated or the source of the data.
Whenever available, these separate data files or calculations shall be
included on the required external thumb drive and file share transfer
with all submittals.
Revised ol'1l'_'n_l Section \, Page 22 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
7 All existing bridge or culvert crossing shall be modeled based upon
actual on the ground sun,ev data correctly tied to a GCCDD or HCFCD
beneln lark, datum and vear of adjustment unless otherwise authorized.
8. Bridge and, or culvert crossing shall be analyzed using the highest
energy answer obtained using the energy and momentum equations.
9 The model should include a reasonable number of cross sections based
upon current elevation data to ensure that the actual drainage system is
properly represented. The spacing of cross sections may be
approximated by using Samuel s equation. The use of numerous
interpolated sections between two sun,eved cross sections that are too
far apart is not an acceptable wav of producing additional cross
sections.
10. Some portions of channels within the Citv are tidally influenced. In
those reaches, the models shall account for tidal conditions.
11. For HEC RAS models, the following contraction and expansion
Coefficients are required. Am, variance from these values must be
preapproved by the Citv
Contraction Coefficient: 0.1
Expansion Coefficient: 0.3
12. Manning s 'n values will follow GCCDD design criteria on the
Galveston Countv side and Harris Countv criteria on the Harris Countv
side. See the latest versions of the GCCDD Drainage Criteria Manual
and the HCFCD Policv Criteria, and Procedure Manual. _Anv deviation
from these 'n values must be approved by the Citv before modeling
begins.
4 Calculation of Outlet Size
Outfalls which utilize a pipe restrictorto control outflow shall use the orifice
equation.
a. Reducer or Restrictor Pipes shall be sized as follows.
1) Use the following equations to calculate the required
outflow orifice
Area of pipe = nd2, 4
Revised ol'11'2o2l Section \ Page 23 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
Q = CA (2 gh)'
D = Ql'2 2.25 h 1 4
Where
Q = outflow discharge in cfs.
C=08
h = water surface differential (ft)
D = orifice diameter (ft)
A = area of pipe (112)
g = gravity (32.2 ft s2)
New flow into receiving stone sewer cannot exceed
undeveloped flow
2) For head differential in systems outfalling into a roadside
ditch or stone sewer, the actual head loss or 1 foot, whichever
is greater, shall be used. For all other discharge conditions.
use 2 feet, or the difference between one hundred (100) year
water surface elevation and the elevation of the twenty-five
(25) vear stone in the receiving channel, whichever is greater
3) For detention systems outfalling into a public stone sewer,
the restrietor shall be sized based upon the peak five (5) rear
developed flow
4) For detention systems outfalling into a public roadside ditch,
the restrietor shall be sized based upon the peak five (5) rear
undeveloped flow
5) For detention systems outfalling into creeks, channels, or
stone sewers sized to earn, the twenty-five (25) vear or one
hundred (100) vear stone, the restrietor shall be metered to
release the five (5) rear, twenty-five (25)vear, and one
hundred (100) vear undeveloped flows.
6) Restrietor shall be either the required diameter or the
equivalent cross -sectional area. The orifice diameter 'D'
shall be a minimum of six (6) inches.
7) Detention ponds less than 1 acre in size shall have a minimum
of 4 inches of freeboard. All ponds one (1) acre or larger in
size shall have at least one (1) foot of freeboard. Freeboard
shall be measured from the maximum one hundred (100) vear
Revised ol'11''o2l Section \ Page 24 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
water surface elevation and shall not be used in the
calculation of storage or mitigation.
5 Detention Pond Structural Requirements.
a. Side slopes shall not exceed a slope of four (4) horizontal to one (1)
vertical.
b Maintenance beans will be required in accordance with the Galveston
Countv Consolidated Drainage District Design Criteria Manual.
C. Ponds with lengths over fifty (50) feet shall have a concrete pilot
channel.
d. Concrete pilot channels shall have a minimum width of four (4) feet
and a minimum thickness of four (4) inches with 43 rebar spaced at
twelve (12) inches on center each wav The concrete pilot channels
shall be constructed of 5-sack cement concrete with a compressive
strength of three thousand (3,000) psi at twenty-eight (28) days.
Provide a one (1) inch depression per everyone (1) foot of transverse
slope, with redwood headers spaced ever, fortv (40) feet.
e. Single -user ponds may use a GCCDD-approved alternative for
concrete pilot channels.
f. Appropriate covering (grass, slope paving, etc.) shall be established
on side slopes and pond bottom, to prevent erosion during periods of
maximum water velocity
g. A concrete gravity spillway set at the maximum ponding elevation,
shall be provided at the detention pond outfall structure.
h. Wet detention ponds, and ponds with vertical walls, shall provide
access for safetv and maintenance purposes. Wet detention systems
shall have a method in place to minimize stagnation, such as an
aeration system.
i. 'Dry detention ponds shall not be designed with less than two (2)
feet of depth.
6 Ownership and Easements.
a. Private Facilities.
Revised ol'1l'_'n_l Section \, Page 25
of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
1) Pumped systems shall not be allowed. Only detention
facilities which rely on gravity to discharge stone runoff will
be allowed by the Citv and the GCCDD
2) Responsibility for maintenance of the detention facility must
be indicated on the plat.
3) All private properties being served shall have drainage access
to the pond.
4) A private maintenance agreement must be provided when
multiple tracts are being served.
b Public Facilities.
1) Facilities will only be accepted for maintenance by the Citv
when such is in the public interest.
2) The Citv will require a maintenance work area twenty (20)
feet wide surrounding the extent of the detention area. Public
rights-of-wav or permanent access easements may be
included as a portion of this twenty (20) foot width.
3) A dedication of easements or reserves must be provided by
the plat.
4) Proper dedication of public access to the detention pond must
be shown on the plat or by separate instrument. This includes
permanent access easements with overlapping public utility
easements.
7 Off -Site Detention in the Galveston Countv Consolidated Drainage District:
a. It is the desire of the Citv of Friendswood that regional detention be
utilized when available. If new development is within the service
area of a publicly owned or operated regional storm water detention
facility connection to such regional facility shall be as required by
the drainage master plan applicable to such facility
b In Galveston Countv offsite detention, such as regional or sub -
regional detention, may be purchased from the Galveston Countv
Consolidated Drainage District provided:
Revised of '11'2o2l Section \ Page 26 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
1) The development drains to the Clear Creek watershed or the
tributaries of Clear Creek.
2) All lots or tracts must outfall into a convevance system with
adequate capacity excluding single familv residential
construction on lots or tracts containing five (5) acres or less.
3) The proposed improvements do not include the subdivision of
land.
4) The developed site does not exceed eight (8) acres for single
familv residential lots or tracts, five (5) acres for multi-faraily
residential lots or tracts, and five (5) acres for commercial lots
or tracts.
5) Regional detention for site development relating to single
familv residential construction on lots or tracts containing
five (5) acres or less may be purchased based on square feet
ofimpen,ious coverbv completing the Attaclnnent 44, a copy
of which is made a part of this manual. All other site
development qualifying for the purchase of regional detention
must submit a new or revised drainage plan.
Contact the Galveston Countv Consolidated Drainage District
(GCCDD) for the latest regional detention rates.
Revised ol'11''o2l Section \ Page 27 of 34
City of Friendswood
Engineering Department
Detention Requirements Summary
Design Criteria Manual
STORM DRAINAGE
LotI�PFILIUII
Attachment
GCCDD
or
Tract
Acreage
Detention
Drainage
olume
Olin
Calc ation
s
#4*
Board
Type
YP
Available
Plans
Method
Required
Approval
Purchase
Regional
Detention
Based On
Not
New
Contact
Not
0 5
Yes
Required
Impervious
GCCDD
Yes
Required
Coverage
for fees
Calculation of
Detention
SFR
Volume
Unnecessary
Engineer
Determines
Contact
5 8
Yes
Required
the Detention
GCCDD
No
Required
Volume by an
for fees
Approved
Method
8+
No
Required
Engineer On
NA
No
Required
Site Detention
Engineer
Determines
Contact
0 5
Yes
Required
the Detention
GCCDD
No
Required
NUR
Volume by an
for fees
Approved
Method
5+
No
Required
Engineer On
NA
No
Required
Site Detention
Engineer
Determines
Contact
0 5
Yes
Required
the Detention
GCCDD
No
Required
COM
Volume by an
for fees
Approved
Method
5+
No
Required
Engineer On
NA
No
Requued
Site Detention
Conveyance
Revised 01/11/2021 Section V Page 28 of 34
City of Friendsivood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
a. The developer shall provide convevance to a detention facility
without having a detrimental effect on anv adjacent properties.
b If convevance is directed through properties not directly owned by
the developer, am executed contract or recorded deed between the
parties agreeing to the said convevance must be presented to the Citv
and the appropriate drainage district entity
C. This procedure is approved by both the Citv and the corresponding
drainage district entity (GCCDD or HCFD) during preliminary plan
review
d. Hvdrograph timing as a substitute for detention on anv project is
prohibited.
10. Lowest Floor Elevation.
a. Refer to the Citv of Friendswood Flood Ordinance (December
2020) Section 34-63 for special lowest floor elevation requirements.
b The latest FENIA FIRM panel and Flood Insurance Studv (FIS) should
be referred to for the base flood elevation and the 0.2 percent flood
elevation.
105 COMPUTER MODELS AND PROGRADIS
A. Current effective models use the HEC HMS and HEC RAS computer programs.
Guidance for applying these programs is in the HCFCD Hydrology and Hydraulics
Guidance Manual and the Galveston Countv Consolidated Drainage District Criteria
Manual. The current effective FENIA model must be used. _Anv departure from using
this model must be submitted in written format and approved by the Citv prior to
submittal.
B. In some cases. HEC HMS and HEC RAS cannot accurately model some projects or
hydraulic conditions. Alternative models may be used only with consent by the
Citv s Engineering Department. All models selected must be freeware or prepared in
a fora such that the Engineering Department can open and review the models. The
Engineering Department must be notified in writing of the program that will be used
with justification early in the design process.
Revised of '11'2o2l Section \ Page 29 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
C All models must be accompanied by a Letter Report or Drainage Impact _Assessment
describing anv assumptions and changes due to the project. All projects larger than
50 acres required a Drainage Impact Assessment.
106 SUBMITTALS
A. Drainage Plan Submittals
1 Preliminary Submittals- Submit for Review and Comment:
One line drawings are required as part of the platting process. One line
drawings shall include
a. Approximate definition of lots and street patterns.
b The approximate drainage areas for each system.
C. A definition of the proposed drainage system by single line.
d. The proposed pipe diameters.
e. _Any proposed drainage easements.
f. Floodplain and floodwav boundaries, if anv
2. Final Design — Submit the following for approval.
a. Copies of anv documents which show approval of exceptions to
the Citv Design Criteria.
b Design calculations for store line sizes and grades, and for detention
facilities, if anv
C. Design calculations for the hydraulic grade line of each line or ditch,
and for detention facilities, if anv
d. Contour map and drainage area map of the project.
e. Plan and profile sheets showing store sewer or open ditch design
(public facilities onlv).
Revised of '11'2o2l Section A Page 30 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
f. Projects located within a floodplain boundary or within a floodplain
management area shall show the floodplain boundary or floodplain
area, as appropriate, on the one -line drawing or drainage area map
g. Soil boring logs.
h. All drainage plans shall have a current FENIA flood zone
determination statement.
i. Fill calculations are required for projects located in the FENIA
floodwav 100-year floodplain and the 500-year floodplain.
3 Signature State — Submit the following for approval.
a. Review prints.
b Original drawings.
c. Storm water detention maintenance agreement letters.
B. National Flood Insurance Program (NFIP) Compliance
1 The Citv of Friendswood is a participant in the National Flood Insurance
program s (NFIP's) Community Rating Svstem (CRS). As a CRS community
the Citv is required to develop and implement various programs intended to
reduce flood risk such as identifving drainage problem areas, maintenance of
existing drainage systems, construction of drainage projects, outreach to the
community etc. As a result of the community s commitment to reduce the flood
risk, the residents of the Citv are entitled to receive discounted flood insurance
premiums based on the Citv s CRS ranking as evaluated by CRS
2. All runoff impacts created by development shall be mitigated, so post -project
runoff rates and flooding levels are equal to or less than equivalent pre -project
conditions.
3 Fill placed in the floodwav 100-year floodplain, or 500-year floodplain as
designated on the current Flood Insurance Rate Map, and below the 500-year
flood elevation shall be mitigated by the removal of a like amount of
compensating cut in the vicinity of the fill, while maintaining hydraulic
connectivity to the existing floodplain.
Revised of '11 2o2l Section \ Page 31 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
4 Am, new development in the floodwav will require a No Rise study All
calculations and, or models must be submitted with No Rise study via the Citv s
pennitting process.
C Drainage Report Drainage Impact Assessment Requirements
Drainage Report,' Drainage hnpaet _ nalvsis must be approved prior to submittal and approval
of Construction Plans. The drainage report must include minimum of the following items
listed in the drainage report:
1 Executive Summary To include detention summary table for projects with
detention.
2. Introduction. Inclusion of project name and purpose, map and description of
project limits, project objectives, assumptions and constraints and anv existing
prior studies. Am, data used must be fully described.
3 Existing Conditions. Include location and topography land use. FENIA
floodplains, right-of-wav pipelines and utilities, sun,ev datum, brief discussion
of impact of historical stone events at the project site. Include and Existing
Condition Drainage Area Map Exhibit.
4 Hydrology and Hvdraulics. Include Design Criteria guidelines used, stone
frequencies analvzed, mitigation requirements etc. Include a listing of programs
and software used. Include discussion of the hydrologic and hydraulic
methodologies used. Include Pre Project and Post Project conditions. For
projects that will be built in a phased approach include an Interim condition.
Include analysis of an extreme event. Exhibits will include Overall Drainage
Area Map. Existing Drainage Area Map with 5 25 100-year flows and water
surface elevations at Major Outfall Nodes, Extreme Condition Map: Floodplain
Maps with project boundary
Proposed Drainage Plan. Include a description of the proposed drainage plan,
results of the hydrological and hydraulics analyses, channel and, or detention
layout, right-of-wav requirements, pipeline and utilitv conflicts, geotecluical
requirements, and anv environmental issues. Exhibits required include Overall
Drainage Area Map. Proposed Drainage Area Map with 5 25 and 100 year flows
and water surface elevations at Major Outfall Nodes, Floodplain Maps with
project boundaries shown. Detention Pond lavout with detention summary and
Plan and Profile with 5-rear. 25-vear and 100-year waster surface elevations in
case of roadway
Revised ol'11'2o2l Section \ Page 32 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
6 Fill Results. Include fill calculations for the floodwav 100-year floodplain and
the 500-year floodplain and a discussion of anv mitigation. Include a Fill Exhibit
showing all areas of cut and fill.
7 Conclusions.
When a detention facility is part of the proposed project, include the following
detention sunmmary table:
Project Name
Detention Basin Area
Acres
Detention Storage Rate
Acres -Feet, Acre
Detention Storage Required
Acre Feet
Detention Storage Provided
Acre Feet
Floodplain Fill Mitigation
`Olulme
Acre Feet
Stone Event
200 o (5 I r)
100 o (25-I ear)
10 o (100-I ear)
Pond Maximums
Design Water Surface
Elevation ( Datutn.
Adjustment)
Maximum Allowable
Outflow 9cfs
Maximum Outflow Provided
cfs
8. Appendix. Include detailed lnvdrological and hydraulic calculations. Include
models and Geospatial data on an external drive.
107 QtTALITI ASSURANCE
Prepare calculations and construction drawings under the supervision of a Professional
Engineer licensed to practice engineering in the State of Texas and trained in the disciplines
required by the drawings. The final construction drawings, all design calculations and anv
submitted reports shall be sealed, signed, and dated by the Professional Engineer licensed to
practice engineering in the State of Texas responsible for the development of the drawings
along with their fire s registration information. All hydrologic and hydraulic calculations
and, or models used during design must be submitted to the Citv via electronic transfer and
on an external hard drive.
2.0 EXECUTION
2.01 RESEARCH REQtTIREMENTS — Reserved
Revised ol'112o2l Section A,
Page 33 of 34
City of Friendswood
Engineering Department
Design Criteria Manual
STORM DRAINAGE
2.02 DESIGN ANALYSIS
A. All projects shall be tied to National Geodetic Sun,ev (NGS) Datum adjustment
which matches the Federal Emergenev Management Agencv (FENIA) rate neaps or
the most current NGVD which matches the FENIA rate maps. In the event GPS
sun,eving is used to establish bencln larks, at least two (2) references to benchmarks
relating to the FENIA rate maps must be identified. Equations may be used to
translate other datum adjustments to the required adjustment.
B. Plan sets shall include a drainage area map which shall contain all stone sewer
drainage calculations.
C All drainage systems for curb -and -gutter pavements shall be underground closed
conduits, individual residential lot drainage is exempt. Drainage systems for
pavements without curb -and -gutter shall be roadside open ditch sections.
D Soil boring with logs shall be made along the alignment of all stone sewers having a
cross section equal to or greater than seventy-two (72) inches in diameter or
equivalent cross section area. Boring should be taken at intervals not to exceed five
hundred (500) linear feet, and to a depth not less than three (3) feet below the flow
line of the sewer The required bedding will be determined from the soil boring.
E. Plan sets shall include the five (5) rear Hydraulic Grade Line for storm sewers and
roadside ditches on the plan and profile sheets.
F All projects located in the floodwav 100-year floodplain, or 500-year floodplain
require fill calculations and Fill Exhibit indicating areas of fill and cut.
Revised ol'11''o2l Section \ Page 34 of 34
City of Friendswood
Engineering Department
SECTION VI
SITE DEVELOPMENT
1.0 GENERAL
Design Criteria Manual
SITE DEVELOPMENT
A. Should anv portion of this Section conflict with the Subdivision Ordinance or the
Zoning Ordinance, the more stringent of the latter two (2) shall govern.
B. The Citv Engineer shall have the final interpretation of anv provisions in this
Design Criteria Manual.
C The Citv Engineer has the right to issue administrative orders or design criteria
modifications for just cause related to anv provisions or conditions in this Design
Criteria Manual.
101 CHAPTER INCLUDES
Criteria for the design of site development plans.
102 REFERENCES
A. City of Friendswood Zoning Ordinance.
B. City of Friendswood Subdivision Ordinance.
C City of Friendswood Standard Details and Technical Specifications, latest
version. These details can be downloaded from.
www.ci.friendswood.tx.us,'350/Publications-Foniis
D Texas Department of Transportation — Traffic Control Plan
E. Architectural Barriers Texas _accessibility Standards (TAS)
103 DEFINITIONS
Commission — Planning and Zoning Commission.
104 DESIGN REQtTIREMENTS
A. Site Development Requirements.
1 General Requirements.
Revised ol'11 2o2l Section VI Page 1 of 1s
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
a. Site development plans for all site developments shall be approved
by the Citv Engineer prior to construction.
b Site developments, not including single familv residential, shall
include anv project that affects public water, wastewater, stone
drainage, sidewalks, or paving facilities.
C. All sidewalks in new developments shall be a minimum of five (5)
feet from the back of curb, two (2) feet from the edge of the public
rights-of-wav and shall not be in anv utilitv easements.
d. All site developments shall eonforn to the requirements of these
Standards, the latest version of the International Code Series, as
amended, and all applicable rules and regulations of the Citv of
Friendswood.
e. All wastewater, drainage, and paving site development
improvements, up to and including the connection to the public
system, shall be privatelv owned, operated, and maintained. All
water site development improvements up to but not including the
meter and meter vault, shall be privatelv owned, operated, and
maintained
f. Restore the Citv of Friendswood rights-of-wav or easements to
existing or better condition than that prior to start of work.
g. Private utilities and service lines shall be placed in an easement on
the propertv being served.
h. Streets that change direction a minimum of ninety (90) degrees
will require a different name.
2. Design Review Requirements for Site Development Plans
a. All site development plans for proposed developments shall be
submitted to the Communitv Development Department for
approval prior to construction. Site development plans shall show
all proposed water, wastewater, paving, parking, drainage, street
signage, streetlight locations, flood protection facilities, and
sidewalks with approved _FDA ramps locations, and a traffic
control plan.
Revised ol'11 2o2l Section AT Page 2 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
b A traffic impact study shall be required for any development
proposal expected to generate traffic volumes that will
significantly impact the capacity and, or safetv of the street system.
All proposed developments generating volumes of five thousand
(5,000) trips per day or greater shall abide by this criterion. The
trip estimate shall be based on the latest version of the histitute of
Transportation Engineers Trip Generation Manual.
C. The developer should first schedule a Development Review
Committee (DRC) meeting with Communitv Development
Department staff. At this meeting, infrastructure issues and the
feasibilitv of developing the site will be discussed.
d. The developer shall prepare a site plan for submittal to be reviewed
by staff. The developer shall consult with staff until all significant
issues surrounding the proposed site plan and development are
resolved, prior to proceeding to the Planning and Zoning
Commission.
1) The submittal for the site plan requires five (5) copies of
the following:
a) Cover Sheet
b) Site Plan
c) Landscaping Plan
d) Building Elevation Plan
e) Photometric Plan
2) and two (2) copies of:
a) Drainage Plan
b) Utility Plan
c) Grading Plan
d) Stomi Water Pollution Prevention Plan
Revised ol'11 2o2l Section AT Page 3 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
e. The final site plan will be presented to the Planning and Zoning
Commission by City Staff for consideration. The Planning and
Zoning Commission reviews the final document for completeness
and public awareness.
f. The final site plan submittal to be provided to Communitv
Development Department staff at least ten (10) days prior to the
nest regularly scheduled Planning and Zoning Commission
meeting.
g. Once the site plan is approved, the developer may begin the
building pennitting process. _approval from the appropriate
drainage entity is required prior to the issuance of building pennits.
h. Three (3) copies of the site development plans shall be submitted
to the Building Official for review The Citv will typically respond
within two (2) to four (4) weeks of the initial submittal.
i. When plan changes are requested, two (2) copies of the revised site
development plans shall be submitted to the Citv for review which
will ultimately result in the reissuance of anv applicable pennit(s).
3 Building Slab Elevations — Minimum building slab elevations shall
eonfonn to the requirements of the Citv of Friendswood Flood Damage
Prevention Ordinance and latest adopted flood zone maps.
4 Water Service — Water service lines and meters shall be sized in
accordance with requirements set out in Section III —Waterline
Distribution Svstem Design Requirements.
5 Sanitary Sewer Service — Sanitary sewer service leads are nonnally
installed during construction of the public sanitary sewer When a sanitary
sewer service lead is to be installed for a site development, refer to Section
II — Wastewater Collection Svstem Design Requirements. All lots, tracts,
or reserves shall be connected directly to a public sanitary sewer by a
single lead, except as specifically approved by the Citv Engineer The
Citv Department of Public Works shall be contacted for all sanitary sewer
connections for commercial projects.
6 Site Drainage Requirements — All commercial, industrial, office,
recreational, and multi -family tracts shall have an internal drainage
system. The internal drainage system shall collect all site runoff and
direct it into a private store sewer system that shall connect to the public
Revised ol'11 2o2l Section AT Page 4 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
7
drainage facilities in the area. Refer to Section N — Storm Drainage
Design Requirements for more details. _illy exceptions require specific
approval from the Citv
a. The internal site stone sewer shall be connected to a public stone
sewer at a manhole or at an inlet adjoining the site. The site
drainage outfall shall be connected to the nearest existing drainage
system with adequate capacity to serve the drainage area. Where
extension of the existing drainage system is required, all costs for
extension shall be the responsibility of the developer
b All internal facilities shall be designed by a Professional Engineer
licensed to practice engineering in the State of Texas, and shall be
sized to drain the site in accordance with these standards.
C. Drainage calculations shall be submitted with all site development
plans. _additional supporting data may be required by the Citv
d. When the site drains directly into a Galveston Countv or Harris
Countv facility and, or into a TxDOT or county rights-of-wav the
appropriate governmental entitv(s) shall approve the site
development connection to the public facilities.
Driveways
a. It is desirable to minimize the number of non-residential driveways
on all streets in order to reduce the number of conflict points and
facilitate traffic flow It is recognized, however, that certain
existing tracts may not be able to fully comply with the following
standards due to limited frontage or other constraints.
b When compliance with these criteria is precluded for any reasons,
attempts should be made to obtain alternative access where
feasible, including joint access driveways, access easements to
adjoining properties, or access to intersecting streets.
C. If it can be demonstrated to the Citv Engineer that sufficient
attempts to secure alternative access have been made, and that such
access is still not possible, the Citv Engineer may accept a Traffic
Impact Atnalvsis performed by a Professional Engineer licensed to
practice engineering in the State of Texas. If approved, the
analysis will be used to allow a deviation to the drivewav spacing
requirements indicated herein.
Revised ol'11 2o2l Section AT Page 5 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
d. Residential driveways shall be a minimum of twelve (12) feet wide
and a maximum of twenty-five (25) feet wide at the rights-of-wav
line, unless otherwise approved by the Citv Engineer, and should
be placed at least twenty-five (25) feet away from the propertv line
at the intersection of two (2) streets and at least five (5) feet from a
propertv line between two (2) properties.
e. Residential lots must have a minimum of one hundred (100) feet of
frontage in order to be eligible for a circular drivewav on the lot,
and the two (2) driveways shall have at least fortv-five (45) feet of
separation between them from the inside edges of driveways.
f. Non-residential driveways shall be a minimum of twenty-five (25)
feet wide and a maximum of thirtv-five (35) feet wide. Non-
residential driveways shall be spaced with a minimum of fifty (50)
foot separation.
g. Non-residential driveways on major thoroughfares boulevard
streets shall be placed no closer than one hundred (125) feet from
the ultimate curb line of the intersecting major thoroughfare or
boulevard street. Non-residential driveways on collector minor
streets are to be placed no closer than seventy-five (75) feet from
the ultimate curb line of the intersecting major
thoroughfare boulevard street. Non-residential driveways on
major thoroughfares boulevard streets are to be placed no closer
than seventy-five (75) feet from the ultimate curb line of the
intersecting collector commercial, minor street.
h. For purposes of determining the separation distance, the back of
curb or edge of street shall be used in conjunction with the edge of
drivewav which is closest and parallel to the street from which the
measurement is to be taken.
i. Non-residential tracts with less than one hundred fifty (150) feet of
frontage on a public street shall have no more than one (1)
drivewav Non-residential tracts between one hundred (150) feet
and three hundred twenty (320) feet of frontage on a public street
shall have no more than two (2) driveways. Non-residential tracts
between three hundred twenty-one (321) feet and six hundred
(600) feet of frontage on a public street shall have no more than
three (3) driveways. Non-residential tracts with over six hundred
(600) feet of frontage on a public street shall have the number of
Revised ol'11 2o2l Section AT Page 6 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
driveways specially designated and specifically approved by the
Citv
j. Non-residential drivewav connections to the public street shall be
approved and inspected by the Citv TxDOT county
representative, or appropriate entity
k. Drivewav radii shall not extend beyond the projection of a propertv
line perpendicular to the back of the curb
1. Driveways shall be installed according to the latest version of the
Citv of Friendswood Standard Details and Technical
Specifications.
M. Driveways shall be evaluated with respect to location of existing or
proposed signage, landscaping, and structures for adequate sight
distance.
n. A note stating. _access to adjacent propertv and common
driveways may be required' shall be placed on the site plan.
o Curb returns for driveways shall be, at a minimum.
1) For residential driveways.
a) Five (5) feet on local streets less than twenty-eight
(28) feet in width.
b) Ten (10) feet on collector streets, major
thoroughfares and boulevards, and local streets
greater than twenty-eight (28) feet in width.
2) For non-residential driveways.
a) Twenty-five (25) feet on local streets less that
twenty-eight (28) feet in width
b) Thirtv-five (35) feet on collector streets, major
thoroughfares, boulevards, and local streets greater
than twenty-eight (28) feet in width
Revised ol'11 2o2l Section AT Page 7 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
8. Fire Lanes
a. Fire lanes shall be required on all multi -family and non-residential
tracts if anv part of a building is greater than one hundred fifty
(150) feet from either a fire lane, private street, or public street
rights-of-wav
b Fire lanes shall be either twenty (20) feet wide with a twenty-five
(25) foot radius or twenty-five (25) feet wide with a twenty (20)
foot radius.
C. Fire lanes shall be constructed using the same pavement structural
requirements as a public pavement. _alternate materials may be
used with specific approval from the Citv Engineer
d. Fire lanes shall be designed to drain in compliance with the Site
Development Requirement.
e. Fire lane markings shall be provided as specified in the
Friendswood Code of Ordinances.
f. An emergency vehicle turn -around, whether a cul-de-sac of a
radius required by the Fire Marshal or a T-bead at least one
hundred twenty (120) feet in length, shall be required under certain
conditions.
9 Controlled _access Gate Requirements
a. Plans for access control systems shall be submitted to the Fire
Marshal s Office and approved prior to construction.
b All access control gates shall have emergency means of operation
in the event of power loss.
C. _access control gates shall provide a clear, passable width of at
least twenty (20) feet.
d. A linos kev switch shall be provided for all controlled access
gates. The kev switch shall operate all gates.
e. A Knoxx pad lock shall be provided for all non -motorized gates.
Revised ol'11 2o2l Section AT Page 8 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
f. The location of the kev switch shall be approved by the Fire
Marshal s Office.
g. The owner or homeowners association shall maintain all parts of
the access system and keep them in good working order
h. The Fire Marshal s Office and Police Dispatch shall be notified
immediately of anv damage to the access system that binders
access including but not limited to, damage to the kev box, lock,
and gates.
i. _access gates shall be far enough back to provide at least fortv (40)
feet of stacking space.
10. Storm Water Pollution Prevention Plan
a. A storm water pollution prevention plan shall be provided for all
site development projects.
b Filter fabric fence shall be installed at the perimeter of the site
before construction begins.
C. Once construction is complete, the filter fabric fence may be
removed: provided a minimum of five (5) feet of livdro-mulch or
sod shall be installed at the back of all curbs, or other Best
Management Practices, shall be implemented and, or installed.
d. Refer to the Storm Water Ordinance for additional requirements.
11. Parking Lot Guidelines
A parking lot layout is required to ensure that adequate off-street parking
is provided with the construction, alteration, or remodeling of anv
building.
a. Minimum concrete slab thickness shall be five (5) inches with an
fc equal to four thousand (4,000) psi. Reinforcement shall be
Grade 60, fv = 60,000 psi. 44 deformed reinforcing bars, spaced at
sixteen (16) inches center to center, both ways with a minimum lap
length of twenty -for (24) inches. Minimum stabilized subgrade
thickness shall be eight (8) inches.
Revised ol'11 2o2l Section AT Page 9 of 15
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
b Hot Mix _asphalt Concrete pavement thickness shall be a minimum
of two (2) inches with eight (8) inches of stabilized crushed
concrete or limestone and six (6) inches of lime -stabilized
subgrade.
C. Off-street parking spaces shall be located on the same lot, tract,
parcel, or premises as the use being served, or on other propertv of
the sauce or less restrictive zoning classification that the owner of
the premises being served has a continuing right to use for parking.
When the off-street parking spaces are not located on the same lot,
tract, parcel, or premises being served, the distance from the center
of the parking lot to an entrance to the building, shall not exceed
five hundred (500) feet in distance measured along the shortest
available pedestrian route with public access.
d. _illy existing building that is enlarged, stnteturally altered, or
remodeled by more than fiftv (50) percent as it existed shall be
accompanied by off-street parking for the entire building. When
the enlargement, structural alteration, or remodel is not increased
or changed by more than fiftv (50) percent, additional off-street
parking shall only be required for the increased or changed floor
area.
e. Existing parking spaces may not be used to satisfy additional off
street parking requirements unless, the existing spaces exceed the
number recommended for the building or use for which the
existing spaces are associated.
f. The number of off-street parking spaces required for each building
or use shall be determined by reference to the Parking Group Table
in _appendix C of this Design Criteria Manual. Where several
different propertv uses will share a joint parking area, the parking
should be computed based upon the overall development.
g. The design and dimensions of off-street parking areas shall be in
accordance with the following table of minimum dimensions.
Minimum stall width shall be nine feet, except for residential and
all-dav office parking which may utilize stalls eight and one-half
(8.5) feet in width, provided that minimum aisle widths are
increased by one (1) foot. In addition, the dimensions of up to
twenty (20) percent of the total number of off-street parking spaces
may be reduced to eight (8) feet in width and sixteen (16) feet in
Revised ol'11 2o2l Section AT Page 10 of Is
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
depth to accommodate compact automobiles (such spaces must be
so marked). All dimensions below are in feet:
.-Ingle
ce reed
0
'.5
45
60
90
Stall, parallel to aisle
23 0
18.0
12.7
10.4
90
Stall, perpendicular to aisle
90
16.5
190
20.0
18.0
Aisle width, one-way
12.0
12.0
12.0
16.0
24.0
Aisle width, one-way
22.0
22.0
22.0
24.0
24.0
Cross aisle, one-way
11.0
11.0
11.0
11.0
11.0
Cross aisle, two-way
22.0
22.0
22.0
1 22.0
22.0
Refer to Appendix B — Figure 8 of this Design Criteria Manual
for Off-street Parking Diagrams
h. Off-street parking spaces shall be clearly marked. Parking spaces
abutting an adjoining propertv line or street rights-of-wav shall be
provided with wheel guards or bumper guards located such that no
part of a nornially parked vehicle will extend beyond the propertv
line. When wheel guards are used, they shall be centered two and
one-half (2.5) feet from the propertv line for ninety (90) degree
parking, two and one-third (2.3) feet for sixty (60) degree parking,
and two (2.0) feet for fortv-five (45) degree and thirtv (30) degree
parking.
i. The parking lavout and design of all off-street parking areas shall
be approved by the Citv Engineer The Citv Engineer shall
determine that spaces provided are usable, and that the circulation
patter within the area is adequate.
j. The number of accessible parking spaces shall comply with the
latest edition of the Architectural Barriers Texas Accessibilitv
Standards (TAS).
k. Accessible parking spaces must be paved and must include
a. The international svmibol of access painted conspicuously
on the surface in a color that contrasts the pavement:
b The words 'NO PARKING painted on anv access aisle
adjacent to the parking space. The words must be painted.
i. In all capital letters.
ii. With a letter height of at least one (1) foot, and a
stroke width of at least two (2) inches, and
Revised ol'11 2o2l Section AT Page 11 of 1s
City of Friendswood
Engineering Department
12.
13
Design Criteria Manual
SITE DEVELOPMENT
iii. Centered within each access aisle adjacent to the
parking space: and
c. A sign identifving the consequences of parking illegallv in
a paved accessible space. The sign must:
i. At a minimum state 'N iolators Subject to Fine and
Towing in a letter height of at least one inch:
ii. Be mounted on a pole, post, wall, or freestanding
board:
iii. Be no more than eight (8) inches below a sign
required by Texas _accessibility Standards. 502.6
and
iv Be installed so the bottom edge of the sign is no
lower than four (4) feet and no higher than six (6)
feet above ground level.
d. A sign that meets the requirements set in Texas
_accessibility Standards. 502.6, that includes the required
language in subsection (c)(i) satisfies these requirements.
Pipelines
All new Pipelines shall be a minimum depth of ten (10) foot in depth to
the top of the pipe in all new or existing road rights-of-wav
Utilitv and Cable Installation
a. Utilitv infrastructure shall be mounted on pads at ground level: if
within the rights-of-wav utilitv infrastructure shall not block
sidewalks or visibilitv at intersections.
b For future individual utilitv service, lines which originate in a
public road right-of-wav and extended to any building or structure
shall be installed underground.
C. On side streets with above -ground utilitv services which intersect a
roadway with underground utility lines, the first pole supporting
the above ground service shall be placed on such a side street at
least one hundred (100) feet from the center of the roadway with
the underground utilities.
2.0 EXECUTION
2.01 RESEARCH REQtTIREDIENTS
Revised ol'11 2o2l Section AT Page 12 of 1s
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
A. Discuss project concepts outlining proposed features and usage with the Citv
B. Research existing utilitv and rights-of-wav information.
C N erifv that no restrictions exist that could result in denial of the project concept.
2.02 DESIGN ANALYSIS — Reserved
2.03 DRAWINGS
A. The site development plan shall include layout sheet(s) providing a photometric
lavout of the site complete with location of proposed lights, information on light
heights, and tvpe of light standard proposed.
B. The site development plan shall include an overall drainage layout showing:
1 Total area (in acres) of site to be drained.
2. Area (in acres) drained to each inlet.
3 Contours or an adequate number of spot elevations to indicate area drained
to each inlet.
4 Top elevation and flowline elevation at each inlet.
5 Gradient and size on each private storm sewer
6 Computations to support pipe sizes and grades shown [minimum private
storm size shall be ten (10) inches].
7 Design velocity for storm sewers shall be three (3) feet per second.
8. A TxDOT or a county pennit shall be required for drainage affecting a
state or county owned; maintained facility Submit pennit with site plan.
9 The drawings shall be prepared and sealed by a Professional Engineer
licensed to practice engineering in the State of Texas.
10. The size and location of any required detention facility shall be indicated
on the plans, along with the size and location of the outfall structure.
C All site development plans shall be approved by the appropriate drainage entity
prior to Citv approval being granted.
Revised ol'11 2o2l Section VI Page 13 of 1s
City of Friendswood Design Criteria Manual
Engineering Department SITE DEVELOPMENT
D The site plan shall show all water and sewer service lines with sizes, grades and
alignments, and illustrate anv proposed ties into the existing public lines.
E. The site development plan shall show all parking areas.
F The site development plan shall indicate the types and location of all existing and
proposed landscaping. Landscaping shall meet the minimum requirements as set
forth in the Zoning Ordinance. If no trees exist, a note to that effect shall be
placed on the site development plan. The Qualified Tree List can be found in
_appendix D of this Design Criteria manual.
G. The site development plan shall show the location, height, and area of all
proposed buildings. All setback lines as required by the Zoning Ordinance shall
also be shown with a dimension called out on the site plan between the building
and the site boundary
H. The land use for all adjacent propertv shall be shown on the site development
plan.
I. All parking lot pavements for site development plans shall be engineered to
provide for operation by vehicles normally expected to utilize the parking area,
and the thickness of paving shall be based upon the soil conditions underlving the
parking area. A Professional Engineer licensed to practice engineering in the
State of Texas shall eertifv the design submitted for approval.
J Sidewalks are required as set out in Section III of the Subdivision Ordinance and
Section 70-64 of the Code of Ordinances. Where sidewalks are required, they
shall have a minimum width of four (4) feet, except on TxDOT rights-of-wav
where the minimum width shall be five (5) feet. The design and installation of
such sidewalks shall comply with Texas _accessibility Standards Architectural
Barriers requirements and the Citv of Friendswood Standard Details and
Technical Specifications. The location of all proposed and existing sidewalks
shall be shown on the site development plan.
K. Show location of signs, screening walls or fences [indicate height, material, and
appurtenances], and dumpsters (with appropriate screening).
L. If the site is located within the Community Overlav District, a plan note shall be
made on the site development plan indicating such: and that the site development
will conform to the Zoning Ordinance requirements.
Revised of '11 2o2l Section VI Page 14 of Is
City of Friendswood
Engineering Department
Design Criteria Manual
SITE DEVELOPMENT
M. No improvements in or to public rights-of-wav shall be made without prior
approval from the CAN, Engineer This includes planting trees in public rights -of
wav within residential and non-residential areas, or in anv utility or drainage
easement. Only Class 2 and Class 3 trees listed in _appendix D of this Design
Criteria Manual may be planted in public rights -of wav if such planting is
approved by the CAN, Engineer No trees of anv class may be planted in utilitv or
drainage easements.
Revised ol'11 2o2l Section AT Page 15 of 15
City of Friendswood
Engineering Department
APPENDIX A
Attachments
ATTACHMENTS
1. Lift Station Start-up Log
2. Design Criteria Modification Form
GCCDD Fonn DR-001
Design Criteria Manual
APPENDIN A
Attachments
Revised o2,'18,'2o2o Appendix Page 1 of
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIX A
Attachments
City of Friendswood Lift Station Start -Up Log
Date
Isite
Pum Number
Address.
Pum Desi nation.
Name Plate Data
Pump Data
Pump Make.
Size.
Pump Model.
TOR
Serial Number.
Impeller Number or Size
Flow in GPM.
P
mp Motor Data
Make(if applicable)
Phase
Serial Number(if applicable)
Name Plate Votla es
RPM
Name Plate Full Load Amps
Service Factor
Pump is wired for
Start -Up Trial Data
Insulation Test
Pre -Start Volta a Test
L1 to CND
L2 to CND
L3 to CND
L1 L2
L2 L3
L3 L1
L1 GND
L2 Gt�D
L3 Gt�D
M
M
M
V
V
V
V
V
V
Run Votla a Test
Run Amperage Tesl
Phase Rotation
L1 L2
L2 L3 L3 L1
L1
L2
L3
ABC
CBA
Operator
Revised 02/18/2020 Appendix A Page 2 of 6
City of Friendswood Design Criteria Manual
Engineering Department APPENDIX A
Attachments
CITY OF FRIENDSWOOD
DESIGN CRITERIA MODIFICATION FORM
Modifications to standards identified in the Design Criteria Manual may be permitted by
the City of Friendswood's City Engineer The modification proposal must be submitted
by a Professional Engineer licensed by the State of Texas and shall follow generally
accepted engineering standards for traffic sidewalk and other infrastructure as applicable
and such proposal contains the following information and substantiates the findings in
Paragraph 4 below If an appeal to the City of Friendswood City Engineer decision is
requested the Construction Board of Adjustment (hereinafter referred to as `the City")
will review that appeal
This entire form must be completed in its entirety If form is
submitted incomplete, it will be administratively rejected
PROJECT NAME
PROJECT ENGINEER
SUBMITTAL DATE
SUBDIVISION NAME
MODIFICATION LOCATION
1 Set forth the proposed deviation to the technical standard
SPECIFIC PROPOSED DEVIATION FROM TECHNICAL STANDARD
Revised 02/18/2020 Appendix A Page 3 of 6
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIN A
Attachments
2. Set forth the impact such deviation has on speed differential and street capacity
the likelihood of accidents, the long teen maintenance and operation effect, the
degree of functionality and efficiency the technological advancements involved,
and other relevant matters.
IMPACT OF DEVIATION
Show a comparison of the technical standard to the proposed deviation with
respect to overall safetv and qualitv speed differential, street capacity existing
and projected accidents, long -teen maintenance and operation, degree of
functionality degree of efficiency technological advancements, and other
relevant matters.
COMPARISON OF TECHNICAL STANDARD TO PROPOSED DEVIATION
4 Describe all mitigating improvements that reduce the negative impact of the
proposed deviation on overall safetv and qualitv speed differential, street
capacity accident occurrences, long -teen maintenance and operation, degree of
functionality degree of efficiency and demonstrating the degree to which the
proposed deviation detrimentally affects the foregoing. Other relevant factors,
including technological advances, should be explained by describing how they
will affect the proposed development. Mitigating improvements can include but
are not limited to, traffic control devices, pavement improvements, added
acceleration or deceleration lanes, or reservoirs, and other on -site improvements.
MITIGATING IMPROVEMENTS THAT REDUCE NEGATIVE IMPACT
SUI%11%LXRY & C'ONC'LUSION/REC'01%11%IENDATION FOR MODIFICATION
Revised o2,'1 8,'2o2o Appendix A Page 4 of 6
City of Friendswood
Engineering Department
List of Supporting Documentation Attached9
Engineer's Name
Engineering Firm
Address
City ST Zip
Design Criteria Manual
APPENDIX A
Attachments
Yes No
Telephone Seal of Professional Engineer
Department of Engineering & Projects Use ONLY
Reviewed By
Date
Modification Request Approved / Denied By
Copies of Backup Information/Notes Attached
City Engineer Date
Revised 02/18/2020 Appendix A Page 5 of 6
City of Friendswood
Engineering Department
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APPENDIN A
Attachments
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Revised n2,'1 8,'2o2o Appendix A Page 6 of 6
City of Friendswood
Engineering Department
APPENDIX B
Figures
Figure
1. Geometric Street Design Standards
2. Divided Roadwav Cross Sections — Urban
3 Roadwav Tapers For Subdivision Streets
4. Undivided Roadwav Cross Sections — Urban
5 Tvpical Length of Median and Median Opening
6. Median Nose and Left Tuna Bav Design
7 Cul-de Sac
8. Drivewav spacing and other measurements
9 Off -Street Parking
Design Criteria Manual
APPENDLK B
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Engineering Department
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Engineering Department
Design Criteria Manual
APPENDIX B
Figures
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Engineering Department
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Design Criteria Manual
APPENDIX B
Figures
Revised 07/01/2017 APPENDIX B Page of 10
City of Fr endswood
Engineering Department
FIGURE 9
OFFSTREET PARKING
NOTES:
1 MINIMUM STALL WIDTHS SHALL BE NINE
z
(9)FEET EXCEPT FOR RESIDENTIAL w
ALL -DAY OFFICE PARKING WHICH MAY o
a
��
UTILIZE EIGHT AND ONE-HALF(81i)
FEET IN WIDTH, PROVIDED THAT
MINIMUM AISLE WIDTHS ARE INCREASED
BY ONE(1)FOOT IN ADDITION THE
DIMENSIONS OF UP TO TWENTY(20) wheel
PERCENT OF THE TOTAL NUMBER OF 0a23
00 24
PARKING SPACES MAYBE REDUCED TO
i—
EIGHT (8)FEET INWIDTH AND SIXTEEN
(16) IN DEPTH TO ACCOMMODATE
COMPACT AUTOMOBILES.
2 PARKING SPACES ABUTTING AN
ADJOINING PROPERTY LINE OR STREET
RIGHTS -OF -WAY SHALL BE PROVIDED
F
WITH WHEEL GUARDS $0 LOCATED THAT
NO PART OF A NORMALLY PARKED
VEHICLE WILL EXTEND BEYOND THE
PROPERTY LINE
d
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900 ANGLE
600 ANGLE
450 ANGLE
I
Design Criteria Manual
APPENDIX B
Figures
Page 10 of 10
City of Fnendswood
Engineering Department
APPENDIX C
Parking Group Table
Design Criteria Manual
APPENDIX C
Parking Group Table
Parking Use Category
Parking Spaces*
Accommodation
Accommodations
1 25 spaces per sleeping room or unit plus the following meeting per
banquet space
less than 10 sq It per sleeping room = none
10 to 20 sq It per sleeping room = 30 spaces per 1 000 sq It GFA,
21 to 50 sq It per sleeping room and over 50 sq It per sleeping
room = 20 spaces per 1 000 sq It GFA
1 25 spaces per sleeping room or unit plus 10 spaces per 1000 sq It GFA
Accommodations with food
restaurant lounge plus the following for meeting/banquet space
less than 10 sq It per sleeping room = none
10 to 20 sq It per sleeping room = 30 spaces per 1 000 sq It GFA,
21 to 50 sq It per sleeping room and over 50 sq It per sleeping
room = 20 spaces per 1 000 sq It GFA
Adult Establishment
1 space for every 4 seats or 1 space for every 50 sq It of customer service
area wluchever is greater
Agricultural, Forestry, Fishing, and
2 per site plus 1 per 1 000 sq It enclosed floor area
Hunting Uses
Amusement and Recreation
Industries
Arcade
1 space per 200 sq It GFA
Driving/Archery/Shooting Range
1 space per 200 sq It GFA of indoor facilities plus 1 space per tee or target
1 space per 500 sq It of outdoor site area plus 1 space per 4 fixed spectator
Fairground Exhibition Carnival
seats
Fitness and Recreational Sports
7 spaces per 1 000 sq It GFA
Golf Course
1 space per 150 sq It GFA of indoor facilities plus 5 spaces per green
Miniature Golf
1 space per 200 sq It GFA of indoor facilities plus 1 5 spaces per hole
Rodeo Circus Auto/Motorcycle
1 space per 3 spectator seats
Racing
1 space per 200 sq It GFA of indoor facilities plus 1 space per 2 persons
Skateboarding Water Slide
design capacity of outdoor facilities
Sports fields Swimming Pools
1 space per 100 sq It GFA of indoor facilities plus 1 space per 4 persons
Private Parks and Playgrounds
design capacity of outdoor facilities including both participants and
spectators as applicable
Tennis Courts and Other Sports
2 spaces per court
Courts
Arts Entertainment and
Recreations
Arena
33 spaces per seat
Baseball Stadium
35 spaces per seat
Football Stadium
31 spaces per seat
Revised O1/29/2019 Appendix C Page 1 of 4
City of Fnendswood
Engineering Department
Design Criteria Manual
APPENDIX C
Parking Group Table
Parking Use Category
Parking Spaces*
Arts Entertainment and
Recreations (cont)
Theater (live performances)
40 spaces per seat
All Other Pub lic Assemb ly
25 spaces perpeison in permitted capacity
Convention Centers
Meeting/Banquet Facilities not
up to 25,000 sq ft =30 spaces per 1,000 sq ft GFA plus
within a hotel or in a hotel but
25,000 to 50,000 sq ft = 20 spaces per 1,000 sq ft GFA plus
exceeding 100 sq ft per sleeping
50,000 and 100,000 sq ft = 10 spaces per 1,000 sq ft GFA plus
room
100000 ormore sq ft = 6 spaces per 1000 sq ft GFA
Automotive Repair
3 spaces per service bay (service bays not included as parking)
Broadcast and Telecommunicatio
1 space for each 300 sq ft GFA
Car Wash
2 per wash bay plus 3 stacking spaces per bay
Civic, Social, and Fraternal
1 space for each 300 sq ft GFA
Associations
Educational Services (based on
maximum design capacity)
Daycare Center or Pre
3 spaces per person licensed capacity enrollment
Elementary
Elementary Middle Schools
Fhgherof 2 spaces perseat in auditonum/gymor 25 spaces perstudent
Secondary Schools
Fhgher of 3 spaces per seat in auditonum/gym or 3 spaces per student
College or University
To be established based on a study of parking needs prepared specifically
for the subject institution
Other Classroom b ased
6 spaces per 1,000 s q ft GFA
Other Not Classroom based
10 spaces per 1,000 sq ft GFA
Finance and Insurance
up to 25 000 sq ft = 3.8 spaces per 1 000 sq ft GFA plus
General Business Offices
25,000 to 100,000 sq ft = 3 4 spaces per 1,000 sq ft GFA plus
100,000 ormore sq ft = 2.8 spaces per 1,000 sq ft GFA
Consumer Service Offices
4.6 spaces per 1,000 sq ft GFA
Data Processing Telemarketing
6 spaces per 1,000 sq ft GFA
Operations
Food Service
Restaurant
10 spaces per 1 000 sq ft GFA
Restaurant bar area
15 spaces per 1 000 sq ft GFA
Fast Food
8 spaces per 1,000 sq ft GFA
Take Out and Delivery Only
3 spaces per 1,000 sq ft GFA
Night Clubs
15 spaces per 1,000 sq ft GFA
Gas Station 1 space for each side of a gasoline pump unit
Health Care and Social Assistance
Medical Offices (not on hospital
4.5 spaces per 1 000 sq ft GFA
campus)
Medical Offices (on hospital 4 spaces per 1,000 sq ft GFA
campus)
Revised O1/29/2019 Appendix C Page 2 of 4
City of Fnendswood
Engineering Department
Design Criteria Manual
APPENDIX C
Parking Group Table
Parking Use Category
Parking Spaces*
Hospitals Nursing and
Residential Care Facilities
HospitallMedical Center
To be established based on a study of parking needs prepared specifically
for the subject institution
Elderly Housing
l space per dwelling unit
Congregate Care/Assisted Living
35 spaces per dwelling unit
Group Convalescent and Nursing
5 spaces per bed
Home
Information Services
3 spaces for each 5 employees on largest shift. or 1 space per 600 sq ft
GFA
Cinemas
Single screen
2to 5 screens
5 to 10 screens
Over 10 screens
Mining, Utilities, Construction,
3 spaces for each 5 employees on largest shift. or 1 space per 600 sq ft
Manufacturing Transportation
GFA
and Warehousing
IndustriaUManufacturing
1.85 spaces per 1,000 sq ft GFA plus required parking spaces for office
sales orsinularuse where those uses exceed 10%GFA
Mobile Home
2.5 spaces pertrailerunil
Non Store Retailers
l space for each 2,000 sq ft GFA
Other Services
1 space for each 250 sq ft GFA
Professional, Scientific, and
Technical Services Management
of Companies and Enterprises,
Administration/Support Services
General Business Offices
up to 25,000 sq ft = 3.8 spaces per 1 000 sq ft GFA plus
25,000 to 100,000 sq ft = 3 4 spaces per 1,000 sq ft GFA plus
100,000 ormore sq ft =2.8 spaces per 1,000 sq ft GFA
Public Administration
1 space for each 300 sq ft GFA
Real Estate, Rental, and Leasing
1 space for each 300 sq ft GFA
Religious Oranizations
4spacesperseat
Residential Uses
Single Family Dw ellings
less than 3 000 sq ft = 2 spaces per dwelling unit
more than 3,000 sq ft =3 spaces per dwelling unit
Multi Family Dwellings Rental
1 space per dwelling unit for efficiency units
1.5 spaces per dwelling unit for 1st bedroom in units with 1 or more
bedrooms plus 25 spaces for each additional bedroom
Multi Family Dwellings Owned
1.0 spaces per dwelling unit for efficiency units
175 spaces per dwelling unit forthe lst bedroomm units with 1 or
more bedrooms plus 25 spaces for each additional bedroom
1 space per dwelling unit for efficiency and 1 bedroomunits plus 5 spaces
Rental in University District
for each additional bedroom
Revised 01/29/2019 Appendix C Page 3 of 4
City of Fnendswood
Engineering Department
Design Criteria Manual
APPENDIX C
Parking Group Table
Parking Use Category
Parking Spaces
Retail Trade
4 spaces per 1 000 sq ft GFA
Shopping Centers
6 spaces per 1 000 sq ft GFA up to 200,000 sq ft.
5.5 spaces per 1 000 sq ft GFA over 200 000 sq ft
Transit and Ground Passenger
Transportation, Scenic &Sihtseeni
1 space per 100 sq ft GFA
Truck Transportation, Warehousing
& Storage
1 space for each 1 000 sq ft non office floor area, plus 1 space for each
300 sq ft office area
Vehicle Dealers
1 space for each 5,000 sq ft of lot area
Wholesale Trade
1 space per 2,000 sq ft gross floor storage per sales area
*Staff may approve a 5% deviation from the recommended parking requirements, unless an alternative
plan is approved by the Planning and Zoning Commission
Revised 01/29/2019 Appendix C Page 4 of 4
City of Friendswood
Design Criteria Manual
Engineering Department
APPENDIX D
Qualified
Tree List
APPENDIX D
Qualified
Tree List
Common name
Botanical name
Class
N/1
Site
L1Eht
Size
Foilage
Bald Cypress
Taxodium distichum
1
N
2 3
2
1
D
Bur Oak
Quercus macrocarpa
1
N
2
1
1
D
Cedar Elm
Ulmus crassifolia
1
N
2
1
2
D
Drummond Red Maple
Acer rubrum var drummondii
1
N
2
1
2
D
Eastern Redbud
Cercis canadensis
1
N
2
2
2
D
Live Oak
Quercus virgimana
1
N
2
1
1
SE
Overcup Oak
Quercus lyrata
1
N
2 3
1
1
D
Pecan
Carya illmoensis
1
N
2
1
1
D
Possumhaw Holly
Ilex decidua
1
N
2
1 2
3
D
Shumard Red Oak
Quercus shumardii
1
N
2
1
1
D
Southern Magnolia
Magnolia grandiflora
1
N
2
1
1
E
Swamp Chestnut Oak
Quercus michhauxn
1
N
2 3
1
1
D
Sweet Bay Magnolia
Magnolia virgimana
1
N
2
2
2
E
Wax Myrtle
Myricacenfera
1
N
2 3
1
3
E
American Elm
Ulmus americana
2
N
2
1
1
D
American Sycamore
Platanus occidentalis
2
N
2
1
1
D
Anacua/Sandpaper Tree
Ehretiaanacua
2
N
2
1
2
E
Arrow wood Viburnum
Viburnum dentatum
2
N
2
2
3
D
Black Hickory
Caryatexana
2
N
2
1 2
2
D
Black Walnut
Juglans mgra
2
N
2
1 2
1
D
Blackgum
Nyssasylvatica
2
N
2 3
1 2
3
D
Callery PearBraford
Pyres calleryana
2
I
2
1
3
D
Carolina buckthorn
Rhamnus carolimana
2
N
2
1 2
3
D
Chalk Maple
Acer leucoderme
2
N
2
2
2
D
Cherry Laurel
Prunes carohmana
2
N
2
2
2
E
Chinese Elm
Ulmus parvifolia
2
I
2
1
2
D
Chinquapin Oak
Quercus muhlenbergr
2
N
2
1
1
D
Common Crapemyrtle
Lagerstroemiamdica
2
I
2
1
3
D
Common Fig
Ficus car ica
2
I
2
1
3
D
Common Persimmon
Diospyros virgimana
2
N
2
1
2
D
Eastern Red Cedar
Juruperus virginiana
2
N
2
1 2
2
E
Eve's Necklace
Sophora affirms
2
N
1
1
3
D
Green Ash
Fraxinus pennsylvanica
2
N
2 3
1 2
1
D
Huisache
Acacia farnesiana
2
N
1
1
3
D
Loblolly Pine
Pinus taeda
2
N
2
1
1
E
Mexican Plum
Prunes mexicana
2
N
1
1
3
D
Nuttail Oak
Quercus nuttalln
2
N
2 3
1
1
D
Ornamental Holly
Ilex spp
2
I
2
1 2
3
E
Paloverde
Parkinsonmaaculeata
2
N
1
1
2
D
Revised 07/O1/2017 Appendix D Page 1 of 4
City of Friendswood
Engineering Department
Common name
Parsley Hawthorn
Post Oak
Red Bay
River Birch
Rough leaf Dogwood
Rusty Blackhaw Viburnum
Sassafras
Scarlet (Red) Buckeye
Shagbark Hickory
Slash Pme
Snowbell
Southern Red Oak
Sweetgum
Texas Mountain Laurel
Texas Persimmon
Texas Pvstache
Texas Redbud
Water Hickory
Water Oak
Western Soapberry
White Ash
White Oak
Willow Oak
Winged Elm
Woollybucket Bumeha
Wright Acacia
Yaupon Holly
American Elderberry
American Holly
American Hombean
Black Locust
Black Willow
Box -Elder Maple
Camphor Tree
Catalpa
Common Pear
Eastern Cottonwood
Flowering Crabapple
Hercules Club Prickly Ash
Honey Locust
Japanese Yew
Japanese Maple
Loquat
Mesquite
Botanical name
Class
N/1
Crataegus marshalln
2
N
Quercus stellate
2
N
Perseaborbonta
2
N
Betula rugra
2
N
Corns drummondii
2
N
Viburnum rufidulum
2
N
Sassafras albidum
2
N
Aesculus pavia
2
N
Carya ovate
2
N
Pins elloittn
2
I
Styrax americana
2
N
Qurcus falcata var pagoda
2
N
Ligmdambar styraciflua
2
N
Sophorasecundiflora
2
N
Diospyros vugimana(male)
2
N
Pistaciatexana
2
N
Cercis canadensis texensis
2
N
Carya aquatica
2
N
Quercus mgra
2
N
Sapmdus drummondii
2
N
Fraxinus amencana
2
N
Quercus alba
2
N
Quercus phellos
2
N
Ulmus alata
2
N
Bumehalanugmosa
2
N
Acacuawnghtn
2
N
Ilex vomitona
2
N
Sambucus canadensis
3
N
Ilex opaca
3
N
Carpmus carolimana
3
N
Robimapseudoacacia
3
N
Salixrugra
3
N
Acernegundo
3
N
Cmnamomum camphora
3
I
Catalpa bignomoides
3
N
Pyrus commums
3
N
Populus deltoides (male)
3
N
Malus spp
3
I
Zanthoxylum clava herculis
3
N
Gleditsiatriacanthos
3
N
Podocarpus macrophyllus
3
I
Acerpalmatum
3
I
Enobotryalapomca
3
I
Prosopis glandalosa
3
N
Design Criteria Manual
APPENDIX D
Qualified
Tree List
Site
Light
Size Foilage
2
2
3 D
2
2
1 D
2
2
2 E
2 3
2
2 D
1 2
3
3 D
2
2
3 D
2
2
2 D
2
2
3 D
2
1
1 D
2
1
1 E
2
1 2
3 D
2
1
1 D
2
1
1 D
1
1
3 E
1
1
3 D
1
1
3 D
1 2
2
3 D
2 3
1
2 D
2 3
1
1 D
2
1
2 D
2
1
1 D
2
1
1 D
2 3
1
1 D
2
1
2 D
2
2
2 D
1
1
3 D
2
1 2
3 E
2
2
3 D
2
2
2 E
2
2
2 D
2 3
1
2 D
3
1
2 D
2
2
2 D
2
1
2 E
2
1
2 D
2
1
2 D
2
1
1 D
2
1
3 D
1
1
3 D
2 3
1
2 D
2
1
2 E
2
2
3 D
2
2
3 E
1
1
2 D
Revised 07/01/2017 Appendix D Page 2 of 4
City of Friendswood
Design Criteria Manual
Engineering Department
APPENDIX D
Qualified
Tree List
Common name
Botanical name
Class
N/1
Site
Light
Size
Foilage
Mexican Buckeye
Ungnadia speciosa
3
N
1
1
3
D
Red Mulberry
Mores rubra
3
N
2
1
2
D
Sugar Hackberry
Celtis laevigata
3
N
2
1 2
2
D
Vitex
Vitex agnus castus
3
I
1
1
3
D
Water Tupelo
Nyssaaquatica
3
N
3
2
1
D
Weeping Willow
Sahxbabylomca
3
I
3
1
2
D
Arborvitae
Thula spp
4
I
Arizona Ash
Fra mus velutina
4
I
Berlandier Ash
Fra mus berlandieriana
4
I
Chmaberry
Mehaazedarach
4
I
ChmesePvstache
Pistaciachmensis
4
I
2
1
2
D
Chinese Tallow
Sapmm sebiferum
4
I
Eucalyptus
Eucalyptus spp
4
1
1 2
1
3
E
Golden Ramtree
Koelreutenapamculata
4
I
2
1
2
D
Japanese Black Pme
Pinus thunbergi
4
I
2
1
2
E
Mnnosa(Silktree)
Albimaluhbrissm
4
I
Mulberry
Mores alba
4
I
2
1
2
D
Siberian Elm
Ulmus pumila
4
I
Silver Maple
Acer saccl a mum
4
I
Tuhp Tree
Linodendrontulipifera
4
I
2
1
1
D
Trees are divided into four classes Class 1 and 2 trees are considered the most valuable in
enhancing the environment and are the most likely to prosper in the Friendswood area
Therefore, only Class 1 and 2 trees shall be approved as new plantings for a) city parks and
property and parking lots and b) for streets or other public right of ways respectively unless
otherwise approved by the City Engineer on the advice of an Urban Forester Species that are
classified as shade trees will reach a height and size that will conflict with overhead powerlines,
permanent structures or the canopy will exceed the limits of a confined space Species that are
classified as small trees will not provide the protection or aesthetic impact of a large shade tree,
yet they are suitable for planting beneath powerlines and are good alternatives for areas of
limited space
Class 1 For the most part this class is for trees that are native will do relatively well in the
Friendswood area, have few diseases or pest problems, are easy to find in local
nurseries and with few exceptions (redbud possomhaw and waxmyrtle) are larger in
size
Class 2 This class is for trees that are mostly native will still do well in the Friendswood area,
have little disease or pest problems, sometimes not quite as easy to find in nurseries, are
more varied in size and in many cases are more suitable for wildlife These trees tend
to have larger and messier fruit and/or are thornier than trees in Class 1 Some of these
trees are also more prone to some decay at maturity and might not do as well in
urbanized areas
Class 3 This class starts to pick up more introduced species the trees might or might not do as
well in the Friendswood area, require a little more maintenance and care, the natives
Revised 07/01/2017 Appendix D Page 3 of 4
City of Friendswood Design Criteria Manual
Engineering Department APPENDIN D
(Qualified Tree List
might be harder to find in a nurser, while the introduced species may be more readily
available and in some cases these trees are more prone to decay disease and pest
problems.
Class 4 this class is exclusively introduced species. Thev may or may not do well in
Friendswood. If they do grow well they have the potential to become invasive species
and cause problems for local ecosystems and are more prone to decay disease and pest
problems. NOT RECOMMENDED FOR PLANTINGS.
Classifications:
N — Native
I — Introduced
Site-
1 — %erophNlie (requires little water)
2 — Xlesie (requires moderate water with good drainage)
3 — Aquatic (tolerates poor drainage once established 3 vears)
Light:
1 — Full Sun (requires a minimum of 6 hours of direct sunlight)
2 — Partial Sun (requires a minimum of 3 to 6 hours of direct sunlight)
3 — Shade (requires less than 3 hours of direct sunlight)
NOTE Lower rating number on this scale is the minimum, but can use the nest higher
rating (i.e. a rating of 2 can also use the rating of 1, a rating of 3 can also use the ratings
of 1 and 2)
Size:
1 — 60 feet and greater ultimate height (large shade tree)
2 — 30 to 60 feet in ultimate height (medium tree)
3 — 30 feet and less in ultimate height (small tree)
Foliage•
D — Deciduous (sheds leaves annually) If placed on the south and west walls will reduce
indoor temperatures in summer by shading the roof and walls. In winter, these trees
allow sunlight through to help beat the building.
E — Evergreen (having green leaves needles throughout the vear) can create a wind break if
placed on the northwest side of a building.
SE — Semi evergreen
For example, the code for Live Oak is 1 N,'2, 1 1, which indicates that the Live Oak is a Class 1
species that is native to Texas, requires moderate water with good drainage, demands or tolerates
full sun, and will exceed 60 feet in ultimate height. As a shade tree, the Live Oak will provide
protection and has aesthetic impact but the tree is not suitable for planting beneath powerlines or
within confined spaces, or in streets or other public rights-of-wav
Revised o7m1 '2ol7 Appendix D Page 4 of 4
City of Pevvdsvootl Deago Crtt,,,Xq,mel
Pv®�eewgOepertmeN APPENDIX
Doweitow DielnetA emc,
APPENDIX E
Downtown District Amenities
Sttee6ap furnishing equ edbyCity fF endswood Cod fach ance Appench C
Zoning CrE me To in Downtown D mct ar mpo an tune oval lenient and amein e
They houldb fhighquality de gnedfo utdoor s and equir minimalm menam All
provided amenities shall be permanently maintained by the property owner including paved
walkway
SEATING
Seating hould It duabl and omfortzbl Shape dge and poorly de fined fab aced
furniture should be avoided Metal is the required material The seating design should
omplement the turn hing All eating houldb ecuredpermanently t paved uface To
afetyzndt avoid andal in Th benchbelow E prefenedmodel howeve the be the
f mtlar z andfeamre mayb approvedbyth Planning and Zoning Comm on
Manufacturer Webcoat Products
Product Metal be the
Model B5WBCLASSIC
Sa 5
Color/fin h Blackfinish
Aluminum famew/contoured backs
TEES WELLS
Tree wells are an attractive way to protect trees planted in paved areas Appropriate tree gates
mdtre well houldb milart E following
TEES GRATES TEES WELLS
Manufactur Neenah Foundry Company
Product Pre gat
Model ASTM A48 Me opol an Se e
Rex d 09AID019 APPENDIX Pegel f5
City of Pevvdsvootl D,,MCrttm,XN,mel
Ev®umwgD,p,t,,,t APPENDIX
Doweitow DielndA emc,
LIGHT POLES
Lighting plays an important part in the character function and security of a streetscape It
hould b on stent with the treetsnp lenient and megat in histo amr f in
Downtown District Light poles shall be the Bishop Crook style The light pole below is the
prefenedm del, however the light pole f milar z and feature may approved by in
Planning and Zoning Comm on
Manufacture
Produc
m Pol w/Teardrop Bixmr
Color/finish
wde oat
!ack
mustb metalhalid
full utoff utoffhat
emits 7,000 to 8,000tlh
qui aleut thereoft
6,OOOK(Kelvi
amre
Lamp h ght maximum hall b 12 Lamp h ght minimum hall b 10 Lamp hall b
To tined towards in gh ofayt illumi at in Turn walkway
Lamp height is the actual lamp height above ground measured at the bottom of the Iamp fixture
wher E gl b bulb begi
TRASH RECEPTACLES
Trash eceptade houldb a ly cces bl To pedest an and trash ollechon They must b
placed to be unobtrusive yet effective and their design should relate to other site furnishings
Trash eceptade houldb firmly attached paving avoid andal in They hould met d
veredtop and ealedbottom t keep ontent dry and ut f ght at all time Approp at
ash eceptade houldb milart E following
Manufacturer
Yc[or Stanley Inc
Product
Trash eceptad
Model
Steel to RB e
Color/finish
Blackfiv h
TGIC of esre powde oat
Rex d 09Aln0l7 APPENDIX Peg,2 f5
City of Pevvdsvootl Oeago CrtterteMeemel
Pv®�eewgOepertmeN APPENDIX
Ooweitow OielnetA emc,
PAVERS
Brick pavers must be used to construct the required brick paved sidewalk in accordance AND the
pe Crcetlon below Ph pave olo andpatern below in prefenedde gn,however the
pavers of similar colors and patterns maybe approved by the Planning and Zoning Commission
Manufacture
lPin HaRB ck Company,Ln
Procne
Paver
Model
Patlhway Se es, Full Rang
Size
4"Wx8"Lx 2 Ya"thick
Colo
Red
Pattern
Sttetche Bond
B ckpaver mustb
et
andbas
with
oncret
borde
tatedbelow andshow
in
attached onstric o
del
1 dramng
N
onaet
amped
onaet allowed to
h
dewalksurfac
Paver allaeo pen 5 f2.0 ack emen abilized and bas
Nonwovefab weed block
1 fASTMC331bedrLng and
2Ya thickb.IN nitpave
Polymeric joint said
Masonryhandtroweled dg estr nt nfomedwitlhb3 Nar
If in paver ar part f an ukac for ehmulartabI 2.0 tabihzedbas an
urface, ompaded95%must It i stalledbelowth 5 f2.0 ack ement tabilized andbas
Rex d 09AIA019 APPENDIX Pege3 f5
City of Fnendswood
Engineering Department
MT W EMI
VONWOVEN FM
VD.1'.ED USE
DRIVE S..
.DRI II
Design Criteria Manual
APPENDIX E
Downtown District Amenities
OLYMERICII INi LLER M ONERV WMDIPoNFLLED
EDGE...'sD .
Revised 07/01/2017 APPENDIX Page 4of5
City of Friendswood
Engineering Department
APPENDIX F
Culverts and Driveways Policy
Design Criteria Nlanual
APPENDLK F
Culvert and Driveways
The purpose of this policy is to establish guidelines, proceditres, and standard practices
regarding installation, maintenance, and repair of culverts and driveways in new and old
subdivisions irith open ditches.
L REPLACEMENT OF DRIVEWAI/CULVERTS DUE TO REPAIRS
A. If a failure occurs on an existing paved drivewav located within the Citv rights -of
wav due to a defect in the existing public infrastructure (i.e. leaking or broken
water or sanitary sewer line, failure in stone sewer, culvert failure, etc.) the Citv
will remove the damaged pavement, repair or replace the damaged infrastructure,
and replace the pavement up to the rights-of-wav line at no cost to the propertv
owner
B. If a failure occurs on an existing paved drivewav located within the Citv rights -of
wav due to age, wear, or subsidence, and the public infrastructure is found to be in
good condition, the propertv owner shall be responsible for the removal and
replacement of the drivewav such replacement being accomplished according to
the Ordinances. Design Criteria, Standard Details, and Technical Specifications of
the Citv hi addition, the propertv owner shall be responsible for anv damages
that may occur to existing public infrastructure, including the culverts, during the
construction process. The propertv owner shall obtain a building pennit from the
Citv for the drivewav replacement and shall call in for inspections as needed.
C If the drivewav to be replaced is on an open ditch street, the culverts may be
replaced with the same size as existing with no drainage calculations required,
unless.
i. Thev are smaller than the 18' minimum requirements, or
ii. The whole drainage ditch is being enclosed (see paragraph III).
D When new culverts are installed and concrete paving is being replaced,
constructionjoints shall be installed as shown in Detail A.
IL PROPOSED DRIVEWAI C'ONSTRUC'TION/CULVERT INSTALLATION
A. When a propertv owner chooses to make improvements to an existing driveway
the propertv owner is responsible for removing and replacing the culverts as well
as the existing paving.
Revised: 01'11'2021 APPENDIX F Page 1 of 7
City of Friendswood
Engineering Department
Design Criteria Nlanual
APPENDLK F
Culvert and Driveways
B. When a propertv owner chooses to construct a new driveway the propertv owner
shall install the prove r driveway culverts and new pavement.
C All work shall be completed in accordance with the Citv of Friendswood
Technical Specifications and Standard Details, latest edition.
D When new culverts are installed and concrete paving is being installed,
constructionjoints shall be installed as shown in Detail A.
III. PROPOSED CULVERT INSTALLATION FOR THE PURPOSE OF
ENCLOSING OPEN DITCHES FRONTING RESIDENTIAL PROPERTY
A. Development Pennit:
i. An approved Citv of Friendswood Development Pennit shall be required
prior to installation of residential stone sewer (unless the stone sewer is
being installed as part of a new residential building, in which case it shall
fall underneath the building pennit). Development pennits shall only be
valid for 1 vear
ii. A plan drawing shall be submitted with the Development Pennit
Application. The plan shall be drawn to a 1 = 20 scale.
iii. Pipe diameters, pipe flow lines, inlet flow lines, and inlet rim elevations
shall be shown on the drawings.
iv All residential stone sewer projects shall extend from propertv line to
propertv line.
v A Traffic Control Plan shall be provided if anv of the proposed work -
involves obstruction of traffic or lane closures of Citv streets.
vi. All residential stone sewers shall be made of Reinforced Concrete Pipe
(RCP) Class III, with a minimum 18' diameter, and shall be designed for
the purpose intended.
vii. Alternate sizes and stvles may be used as long as thev meter the same
square inch area of the required pipe size, and is approved by the Citv
Engineer
B. Installation.
i. Stone sewer inlets shall be located no farther than 15 feet from the
propertv line.
ii. Stone sewer inlets shall be no farther than 30 feet from center to center
Revised: 01'11'2021 APPENDIX F Page 2 of 7
City of Friendswood
Engineering Department
Design Criteria Nlanual
APPENDLK F
Culvert and Driveways
iii. Only Tvpe A Inlet (Detail B) or Tvpe 'S Inlet (Detail C) shall be used.
iv Inlet and junction box size and design shall be approved by the Citv
Engineer
v High points shall be located halfWav between inlets with mild swales (see
Detail D).
vi. Elevations on inlet rims shall be a minimum of 3 inches lower that the
surrounding high points (see Detail D).
vii. All storm sewer projects are subject to inspections by City of Friendswood
personnel before thev are covered up Such inspections may require
changes or corrections to all or part of the culvert installations during anv
phase of the work. All inspections shall be called into the Building
Division at (281) 996-3201 a minimum of 24 hours prior to inspections.
viii. Contractor shall have a means to determine flows on site (i.e. laser level,
level, etc.).
ix. All storm sewers shall receive a final inspection and approval by City of
Friendswood personnel upon completion. Am, deficiencies noted shall be
completed within 30 days of such notice.
x. The Citv of Friendswood reserves the right to adjust or remove all or part
of the store sewer at anv time for anv reason.
xi. All work shall be completed in accordance with the latest revisions of this
Design Criteria Manual. Citv of Friendswood Technical Specifications.
and Citv of Friendswood Standard Detail, which can be found online at:
www.ci.friendswood.tx.us,'350/Publications-Foniis
IV ACKNOWLEDGEMENT
By signing the pennit application, the applicant acknowledges thev have received and
fully understand the requirements pertaining to the installation of residential storm
sewers.
Revised: 01'11'2021 APPENDIX F Page 3 of 7
City of Frlendswood Design Criteria Manual
Engineering Department APPENDIX F
Culvert and Driveways
6 % 6 6 W. V.V.M, QHAQ
VIIHIN PRIVATE R➢PERT.
12' MIN.
NOTE.
PROPERTY LINE
AT PROPERTY LINE
pa REBAR B t6 CC E.V
L
EXPANSION JOINT ON
SEALE➢ EXPANSION
WITHIN CRY RJON
CONCRETE STREETS SHALL
JOINT (REQUIRED)
BE NOMINAL REDWOOD OR
SPHALTIC EXPANSION
2
2'
JUINT MATERIAL WITH 1
NIN. lo' 0 RCP MIN
PULL-DF STRIP TO BE
ILLS➢ VIT PPROVED
MINIMUM 5 (TTP)
MINIMJM 5 QTPJ
JOINT SEALANT
2
Ti. LIP (CONCRETE
STREETS ONLY) SHALL NOT
BE RERUIR E➢ DN STREETS
12' MI N
12' MIN.
WIT. 4' X 12' MOUNTABLE
CURB.
3
CONCRETE PAVEMENT
SEALED E%PANSION
EXTEN➢ E%[STING EXPAN S[ON JO MTS
HEADERS SHALL BE BUILT
JOINT (REQUIRE➢)
INTO PROPOSED DRIVEWAY
IN ACCOR➢ARSE WITH CITY
0 FRIENDSWOOD AVIAN
PLAN
— ALL STREETS
DETAILS.
a.
CONNECTION TO EXISTING
ASPHALT STREETS SHALL
BE MADE BY BLOCKING NEW
CONCRETE WITH EDGE OF
l LIP
X1 REMR 16' D.L. EV
PAVEMENT A .' DEEP BY
SEALED EXPONSION JO[NT
VRH IS LAP$ (i YPO
12' VIBE BEAM SHALL BE
B., % $' ➢OVEL
PROPOSE➢ ➢RIVEVAY
PLACED ALONG THE EDGE
OF SHE ASPHALT
PAVEMENT NO EXPANSION
JOINT MATERIAL REQUIRED
PIPE ^. 8 MIN
BETWEEN EXISTING
DISALT STREET NO NEW
EXISTING
➢I A'
CONCRETE DRIVEWAY.
CONCRETE
SEE NOTE 3 -
5.
DAMAGE TO EXISTING
PAVEMENT SEE
NOTE ]TRENCH
LIMB$
STREETS, WHETHER
ASPHALT OR CONCRETE
SHALL BE REPAIRED AT
ALL EXPENSE
PROFILE —
CONCRETE STREETS
6.
GDOGFESEE
CLASS 'A', 3,000 PSI AT
TWENTY-EIGHT DAYS
USE MATERIAL AND
EXISTPNG
➢IMENSIDN AS SPECIFIED
ASPHALT
IN STORM SEWER ➢ETAILS
STREET
PROPOSED DRIVEWAY
FOR TRENCH WIDTHS AND
2 EACH .5 REHAB MO REBAR, 16 6C. EDW
D.
BACK FILL .
NO MORE THAN ONE
TDP
6 BOTTOM WITH 15' LAPB (TTPJ
(0
DRIVEWAY ON LOTS WITH
LESS THAN 120 OF
FRONTAGE
9
21 % %' DOWELS SHALL
B
BE EMBEDDED A MINIMUM
PIPE 1 8' NIN.
OF 12 INTO EXISTING
D.
12' -u.
CONCRETE ROADWAY.
DDVELS TO BE INSTALLED
SEE NOTE
_'
TRENCH
➢ LIMITS
AT 12' OLi
XS ST TRIPS
E 29' OL
PROFILE
— ASPHALT STREETS
RESIDENTIAL CONCRETE DRIVEWAY
(OPEN DITCH STREETS)
DEPARTMENT OF PUBLIC WORKS
DRAWN. 12/09 SCALE. N T S DRAWING. R.S #11
Rmsed 01/11/2021 APPENDIX Page 4of7
City of Fnendswood
Engineering Department
CE`�7
Design Criteria Manual
APPENDIX F
Culvertand Driveways
l A
IS
illml
PLAN
@Si WOX OPAI.
kNOCKICUTS
d
AS RE 110
z
MIRiPR
T-
L
SECTION A —A
TYPE A INLET
ROLES
* CCBN�TF SHALL BE WTH
PRE:s.
STRENTO OF PACO PS
TYPE "A"INLET
DEPARTMENT OF PUBLIC WORKS
DRAWN. 08/10 1 SCALE. NTS I DRAWING. R.S #14
ReIased 01/11/2021 APPENDIX Page 5of7
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIX F
Culvert and Driveways
6 OR 12 RISER SJ
PLAN
31 II
r 1. T ➢EPIH VAF
1 WITH SIZE
DE PIPE
PROFILE
ISOMETRIC
I USE GRADE 60 REINFURCEMENT
2 USE 4,500 PSI CONCRETE
3 RADIUS OF PIPE VARIES
TYPE "S"]INLET
DEPARTMENT OF PUBLIC WORKS
DRAWN- 10/14 1 SCALE N.T.S DRAWING ENO p19
Rmsed 01/11/2021 APPENDIX Page 6of7
City of Frlendswood
Engineering Department
Design Criteria Manual
APPENDIX F
Culvert and Driveways
PRGPER LINE
PROPER..
LME
L
J
" MIN.
.�
3➢ MAX,PRO
POSED GRADE BREAK ITYP.)
SEE SECTION BELOW
15
IMIN.
f_�
DIREC am OF FLOW PROPOSED CULVERT
MATCH
EXISTING
I (STING CULVER' E:ISTING ROAD PAVEET
CULVERT
PLAN
VIEW FOR SINGLE DRIVEWAY
PROPERTY LINE PROPERTY LINE
LIN.I ➢ NA I �� PFOPOSEO GRA➢E Bft�iYPJ + 115 MINI
➢IREC'ION OF FLOW
EXISTING CULVERT � EXISTING MAD PAVEMENT
CULVERT
PLAN VIEW FOR DOUBLE DRIVEWA"
INSTALL HIGH POINT (TYPJPOINT RYP)
Fr 3' MIN.,
1 I JI I I + I
➢IRECTION OF FLOW
PLAN PLAN
DRAINAGE GRADING
REQUIREMENTS FOR FILLING IN ROADSIDE
DITCHES IN RESIDENTIAL AREAS
DEPARTMENT OF PUBLIC WORKS
DRAWN 10/16 SCALE N T S DRAWING ENG #21
Revised 01/11/2021 APPENDIX Page 7of7
City of Friendswood
Engineering Department
APPENDIX G
Traffic Control Sign Policy
TABLE OF CONTENTS
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Attachments List
.2
Purpose
3
Scope
3
Terms
4
Procedures
5
Traffic Concern Request Flow Chart
6
Specific Neighborhood Traffic Issues
7
No Parking,' Parking Zone Implementation Requests
7
No Parking,' Parking Zone Removal Requests.
8
Commercial Truck Cut Through Traffic Mitigation Requests.
.9
Pedestrian Facility Requests
10
School Zone Safetv Requests.
11
Speed Control Requests
12
Intersection Control Requests (Multi-Wav Stops. Traffic Signals, and Roundabouts)
13
'Children at Plav and 'Deaf Child Area Sign Requests
14
Other Advisor, or Advanced Wanting Sign Requests
14
Other Public Safetv and Traffic Issue Requests
14
Revised ol'11'_'o2l Appendix Pagel of38
City of Friendswood
Engineering Department
ATTACHMENTS:
A. No Parking and Parking Zones
B. Commercial Truck Cut Through
C Pedestrian Facilities
1. Pedestrian Safetv
IL Pedestrian Crosswalks
III. Pedestrian Signals.
D School Traffic Safetv
1. Around Schools
IL Around School Buses
E. Speed Limits
F Intersection Controls
I. STOP signs
IL YIELD signs
III. Traffic Signal Installation.
G. Children at Plav Signs
H. Speed Humps. Bumps, and Lumps
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
15
18
20
20
21
23
25
25
26
30
33
33
34
34
36
37
Revised ol'11'_o2l Appendix G Page 2 of 38
City of Friendswood
Engineering Department
PURPOSE
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
This policy establishes consistent procedures for addressing traffic -related concerns that may
occasionally arise along roadways within or nearby residential areas in the city Traffic
concerns specifically addressed in this policy include the following:
• No Parking,' Parking Zone Requests
• Cut Through Traffic Mitigation Requests
• Pedestrian Treatment Requests
• School Zone Safetv Requests
• Speed Control Requests
• Intersection Control Requests (Multi-wav Stops. Traffic Signals, and Roundabouts)
• 'Children at Plav Sign Requests
• Other Advisory or Advanced Warning Sign Requests
• Other Public Safetv and Traffic Issue Requests
Other traffic concerns not specifically addressed in this policy may be presented to staff for
review by anv citizen. Homeowners _Association (HOA) business, or group The Engineering
staff will work with those parties to review their situation and formulate an appropriate
response as neeessary
In accordance with the Citv of Friendswood Code of Ordinances Chapter 82 — Traffic and
N ehicles and further stated in Ordinance 300, the Traffic Engineer or their designee, will be
responsible for all traffic investigations in the Citv of Friendswood.
SCOPE
The Citv of Friendswood is committed to improving the quality of life within its Citv When
a request is made to review a traffic concern, the Citv s direct efforts are to work and
coordinate with the requesting partv in understanding and addressing concerns in a defined
area. The Engineering Department (hereafter called 'Engineering') will inforn the affected
residents of anv significant changes. This policy is applicable only to non -state routes.
The adoption of this policy is not intended and should not be construed to affect or waive the
Citv s immunity from damages under the Texas Tort Claims Act (CPRC Chapter 101) or anv
other law or ordinance. This policy does not require the Citv to install, remove, or modifv anv
traffic control device, sign, signal, or warning device if the Citv has, in the absence of this
policy the discretion under State law to install, remove, or modifv the traffic control device,
sign, signal, or warning device. All investigations for traffic concerns and signage shall be
investigated and warranted in compliance as outlined in the Texas Manual on Uniform Traffic
Control Devices (TMUTCD), latest edition.
Revised ol'11'_o2l Appendix G Page 3 of 38
City of Friendswood
Engineering Department
TERMS
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Citv Traffic Director — The Duties of the Citv Traffic Director will be encompassed by the Citv
Engineer The Citv Manager will retain the final approval,disapproval authority over all
decisions of the Citv Traffic Director
Engineering Judgment — The evaluation of available pertinent information, and application of
appropriate principles, provisions, and practices as contained in the TMUTCD (see below) and
other sources, for the purpose of deciding upon the applicability design, operation, or
installation of a traffic control device. Engineering judgment shall be exercised by an engineer,
licensed to practice engineering in the State of Texas, or by an individual working under the
supervision of an engineer, through the application of procedures and criteria established by the
engineer Documentation of engineering judgement is not required.
HOA — Homeowners Association approved, recognized, and incorporated by law
Ordinance 300 — The Citv of Friendswood Ordinance 300 grants the power to the Citv Traffic
Director the authority to determine installation and proper timing and maintenance of traffic
control devices, to conduct engineering analyses of traffic accidents to devise remedial
measures, to conduct engineering investigations of traffic conditions, to plan the operation of
traffic on the streets and highways of the Citv of Friendswood, and to cooperate with other
officials in the development of ways and means to improve traffic conditions, and to cam, out
the additional powers and duties imposed by the ordinances of this Citv
ROW — Right(s)-of-wav the area between propertv lines given the legal right by usage or grant,
for traffic or pedestrian travel.
TMUTCD — Texas Manual on Unifonm Traffic Control Devices. The TMUTCD is the
authoritative manual on installation, implementation, and maintenance of all tvpes of traffic
control devices, both permanent and temporary for the State of Texas.
Traffic Committee — The Traffic Committee is composed of emplovees of the Citv of
Friendswood representing the Police Department, the Fire Marshal s Office, the Public Works
Department and Engineering Department.
Traffic Studv — A traffic study is the procedures and other investigations as described in the
TMUTCD to determine if a warrant is necessary for a traffic concern.
Warrant — a warrant describes the threshold condition based upon average or normal conditions
that, if found to be satisfied as part of an engineering study shall result in analysis of other
traffic conditions or factors to determine whether a traffic control device or improvement is
justified. Warrants are not a substitute for engineering judgement. The fact that a warrant for a
particular traffic control devices is met is not conclusive justification for the installation of the
device.
Revised ol'11'_'o2l Appendix G Page 4 of 38
City of Friendswood Design Criteria Manual
Engineering Department APPENDIN G
Traffic Control Sign Policy
PROCEDURES
1 Residents, homeowners associations, or similar type groups may make a written
request to Engineering requesting that a traffic concern be addressed. Traffic
concerns may be submitted directly to Engineering via a Tillable forn at
www.ci.friendswood.ts.us,'350iPublications-Forms under Traffic.
2. The requesting partv s issue will be entered in the Engineering Traffic
database to search for similar requests in the subject area.
3 Staff will communicate with the requesting partv to fully understand their
request and thoroughly define the area of concern.
4 Engineering will identify the area of concern and define the area affected.
5 Engineering staff will evaluate the request, collect data if necessary to confine
the magnitude of the problem, and determine if further study is necessary
6 If the Engineering staff determines that further study is necessary procedures
to address the specific traffic issue will be implemented. These procedures
are detailed in the following portion of this policy 'Specific Traffic
Concerns.
7 Should changes be warranted. Engineering shall attempt to convev the
proposed changes with the impacted residents before any improvements are
implemented.
A flow chart that graphically illustrates the above listed procedures is illustrated on the
following page.
Revised ol'11'_o2l Appendix G Page 5 of 38
City of Friendswood
Engineering Department
Traffic Concern Request Flow Chart
Design Criteria Manual
APPENDIX G
Traffic Control Sign Policy
Is'trarec
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Revised O1/11/2021 Appendix Page 6of38
City of Friendswood
Engineering Department
SPECIFIC TRAFFIC CONCERNS
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Specific types of traffic requests in the Citv of Friendswood are addressed in this section of the
policy
No Parking/Parking Zone Implementation Reauests
As with all requests to review traffic concerns in the Citv of Friendswood, requests for 'No
Parking 'Parking zone implementation will be addressed with the same measures outlined in
the Procedures section of this policy
• Engineering and the originator of the request will define a study area for propertv
owners that may be impacted by a proposed 'No Parking 'Parking zone.
• An engineering study will determine if a 'No Parking 'Parking zone is
appropriate for the requested area for twenty-four (24) hours per day or for specific
days and, or time periods.
• In order to implement a 'No Parking 'Parking zone, 1000 0 of the propertv owners
that are projected to be affected adjacent to their propertv must agree in writing to the
'No Parking 'Parking zone implementation. The requestor will be required to
obtain signatures from the owners.
• If deemed appropriate by an engineering study and agreed to by the propertv owners
that will be affected adjacent to their propertv 'No Parking 'Parking signs will be
posted by the entire street, block, or logical termination point as determined by
Engineering. Other advisor, or advanced warning signs will be placed as dictated by
sound common engineering practices or the Texas Manual on Uniform Traffic Control
devices, latest edition.
• All 'No -Parking 'Parking zone applications shall be thoroughly reviewed by
Engineering after a period of two (2) frill vears from the date of implementation.
The 'No -Parking 'Parking zone shall remain in effect unless a compelling safety
reason is discovered.
As with all requests to review traffic concerns in the Citv of Friendswood, should the
implementation of a 'No Parking 'Parking zone in the study area be warranted. Traffic
Engineering and Operations shall attempt to convey the proposed changes with the impacted
residents before anv modifications or improvements are implemented.
Additional information concerning no parking,parking zones is included in the Attachment A
under the title 'v o Parking and Parking Zones.
Revised ol'11'_o2l Appendix G Page 7 of 38
City of Friendswood Design Criteria Manual
Engineering Department APPENDIN G
Traffic Control Sign Policy
No Parking/"Parking' Zone Removal Reauests
As with all requests to review traffic concerns in the Citv of Friendswood, requests for 'No
Parking 'Parking zone removal will be addressed with the same measures outlined in the
Procedures section of this policy
• An engineering study will determine if the removal of a 'No Parking 'Parking
zone is appropriate for the requested area. If appropriate. 'No Parking 'Parking
signs will be removed by the entire street, block, or logical termination point as
determined by Engineering and the requesting partv Other advisor, or advanced
warning signs will be placed, or removed, as dictated by sound common engineering
practice or the Texas Manual on Uniform Traffic Control devices, latest edition.
As with all requests to review traffic concerns in the Citv of Friendswood, should the
removal of a 'No Parking 'Parking zone in the study area be warranted. Engineering shall
attempt to convev the proposed changes with the impacted residents before anv
modifications or improvements are implemented.
Additional information concerning no parking parking zones is included in the Attachment
A under the title Iv Parking and Parking Zones.
Revised ol'11'_'o2l Appendix G Page 8 of 38
City of Friendswood Design Criteria Manual
Engineering Department APPENDIN G
Traffic Control Sign Policy
Commercial Truck Cut -Through Traffic 1\litiQation Reauests:
As with all requests to review traffic concerns in the Citv of Friendswood, requests for
commercial truck cut -through traffic mitigation control will be addressed with the sauce
measures outlined in the Procedures section of this policy
• An engineering study will detennine the measures that are appropriate to address the
specific commercial truck cut -through traffic mitigation concerns that may exist for
the given the study area. In order to be considered a candidate for measures to reduce
commercial truck cut -through traffic, a roadway must be a local roadway or a minor
collector roadway with residential characteristics with a peak hour volume of over 375
vehicles in one direction with over 400 o cut -through vehicles.
• To implement a plan which limits commercial truck cut -through traffic. 1000 o of the
affected propertv owners must sign a petition as implemented through these policy
guidelines.
As with all requests to review traffic concerns in the Citv of Friendswood, should changes
to the study area to control commercial truck cut -through traffic in the study area be
warranted. Engineering shall attempt to convey the proposed changes with the impacted
residents before any modifications or improvements are implemented.
Additional information concerning commercial truck cut -through traffic is included in the
Attachment B under the title Commercial Truck Cut Through Traffic Ahtigation.
Revised ol'11'_'o2l Appendix G Page 9 of 38
City of Friendswood
Engineering Department
Pedestrian Facility Reauests:
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
As with all other requests to review traffic issues in the Citv of Friendswood, requests for
pedestrian improvements will be addressed with the sauce measures outlined in the
Procedures section of this policy
• Engineering will studv the requested location and perform a crosswalk analysis which
includes volume of pedestrian traffic, proximity of the subject location to schools,
parks, swimming pools, retail centers, hike and bike facilities, vehicular traffic
volume, etc.
• The placement of a crosswalk at an uncontrolled intersection or in the middle of a block
shall be considered only in rare cases. In general, the placement of a crosswalk at an
uncontrolled intersection may create a false sense of security for pedestrians that could
increase the likelihood of a vehicle -pedestrian incident.
As with all other requests to review traffic issues in the Citv of Friendswood, should
pedestrian improvements be warranted. Engineering shall attempt to eonvev the proposed
changes with the impacted residents before anv modifications or improvements are
implemented.
Additional information concerning pedestrian facilities is included in the Attachment C
under the titles Pedestrian Safeh Pedestrian Signals, and Installation of Alarked
Crosswalks.
Revised ol'11'_'o2l Appendix G Page 10 of 38
City of Friendswood
Engineering Department
School Zone Safety Reauests.
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
As with all other requests to review traffic issues in the Citv of Friendswood, requests for
school zone safetv will be addressed with the same measures outlined in the Procedures
section of this policy School zone safetv requests encompass a broad range of requests in
the vicinity of a school. Common requests in the Citv of Friendswood are addressed
specifically below Other requests will be addressed on a case per case basis.
• The traffic policy is not intended to replace or alter the existing provisions and
ordinances established by the Citv of Friendswood.
• Reduced speed school zones are areas in which the speed limit is reduced for certain
periods of the day that may be requested by individual citizens, communities, or
schools. A traffic engineering study will determine if a reduced speed school zone is
warranted based on the proximity of the roadway to the school, the tvpe of school
(elementary junior high, senior high, etc.), vehicular volumes, pedestrian volumes,
vehicular speeds, availability of sidewalks, alternative routes between the school
residential areas served by the school, and other factors.
• Requests for a crosswalk in the vicinity of a school will be treated with the same
procedures as outlined in the 'Pedestrian Facilitv Requests section of this policy
Proximity to schools and tvpe of vehicular control are major factors in the
consideration of crosswalks.
• Parking restrictions in the vicinity of a school will be treated with the same
procedures as outlined in the 'No Parking Zone Implementation section of this
policy Proximity of schools is a major factor in the consideration of parking
restrictions.
• No right -turn on red at signalized intersections in a school zone is a means to reduce
the likelihood of conflicts between right -turn vehicles and school aged children in
crosswalks. If appropriate, a traffic engineering study will determine the need for no
right -turn on red restrictions based on vehicular volumes, pedestrian volumes, traffic
signal timing, and other factors.
• The Texas Manual of Uniform Traffic Control Devices (latest edition) does not
require the installation of flashing beacons to alert motorists to school zones. The
Citv of Friendswood will consider the installation of school flashing beacons on
arterial and collector roadways, but not on local streets.
As with all other requests to review traffic issues in the Citv of Friendswood, should
changes to the conditions within a school zone be warranted. Engineering shall attempt to
convev the proposed changes with the impacted residents before anv modifications or
improvements are implemented.
Additional information concerning school zone safetv is included in the Attachment D under
the titles School Zones and School Traffic Safeh
Revised ol'll'_'o2l Appendix Page II of38
City of Friendswood
Engineering Department
Sneed Control Reauests.
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
As with all other requests to review traffic issues in the Citv of Friendswood, requests for
speed control will be addressed with the same measures outlined in the Procedures section
of this policy
• Engineering will maintain a database of locations at which excessive vehicular
speeds have been reported that will be shared with the Police Department for
enforcement purposes.
• The Texas Manual of Uniform Traffic Control Devices (latest edition) states that a
speed limit should be posted within 5 mph of the 85th percentile speed of the free
flowing traffic. Engineering Judgement is the overriding determination for all speed
limit postings.
• The following alternatives are available to address speed control requests.
The Neighborhood Speed Watch Program is a public awareness program
through which concerned citizens can take an active role in making
neighborhood streets safer by observing and recording traffic speeds in their
neighborhood. Additional information and application forms to participate in
the Neighborhood Speed Watch Program may be obtained from Traffic
Engineering and Operations, the Appendix of this poliev or downloaded at
www.ci.friendswood.tx.us.
A speed feedback sign may be installed to alert motorists to their actual speed
and the posted speed limit on a roadway Additional information concerning the
speed feedback sign is included in the Appendix of this policy
A speed study may be conducted at the site. The speed study will determine the
85th percentile speed and consider other issues in the site vicinity including
pedestrian traffic volunne, roadway curvature, the frequency of traffic accidents,
sight distance restrictions, and other issues specific to the study site. The speed
study may determine that the posted speed limit at the study site is too low'higjn
and may recommend that the posted speed be adjusted to within 5 mph of the 85 n
percentile speed.
As with all other requests to review traffic issues in the Citv of Friendswood, should
changes to the speed control in the study area be warranted. Engineering shall attempt to
convev the proposed changes with the impacted residents before any modifications or
improvements are implemented.
Additional information concerning speed control is included in the Attachment E under the
title SpeedLimits.
Revised ol'l 1'2o2l Appendix G Page 12 of 38
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Intersection Control Reauests (Multi -way Stops. Traffic Signals, and Roundabouts):
As with all other requests to review traffic issues in the Citv of Friendswood, requests for
intersection control will be addressed with the same measures outlined in the Procedures
section of this policy
• Multi-wav stop signs or traffic signals shall not be installed within the corporate Citv
limits of the Citv of Friendswood unless approved by an authorized warrant analysis
and by the Citv Traffic Director
• Multi-wav stops and traffic signals are warranted based on vehicular traffic volumes,
pedestrian traffic volumes, vehicular speeds, traffic accident data, and other traffic data
in accordance with guidelines defined in the Texas Manual of Uniform Traffic Control
Devices (TMUTCD).
• According to the TMUTCD 'regulator, and warning signs should be used
conservatively because these signs, if used to excess, tend to lose their effectiveness. If
confinned by a traffic engineering study existing multi-wav stop locations that are not
warranted will be removed by the Citv of Friendswood.
• According to the TMUTCD stop signs or traffic signals shall not be installed for the
purpose of controlling the speed of a roadway as thev have been shown to become a
hazard at times when installed without warrant.
• Implementation of multi-wav stop signs, traffic signal, and roundabouts will be in
accordance with necessary budget considerations.
As with all other requests to review traffic issues in the Citv of Friendswood, should
changes to the intersection control in the study area be warranted. Engineering shall attempt
to convev the proposed changes with the impacted residents before any modifications or
improvements are implemented.
Additional information concerning intersection control is included in the Attachment F under
the titles Stop Signs, Signal Installation, and Roundabouts.
Revised ol'11'_'o2l Appendix G Page 13 of 38
City of Friendswood Design Criteria Manual
Engineering Department APPENDIN G
Traffic Control Sign Policy
`Children at Play and `Deaf Child Area' Sign Reauests:
'Children at Plav and 'Deaf Child Area signs are not recognized by the State of Texas or by
the Federal Highwav Administration as official traffic control devices. These signs may
create a false sense of security for parents of children and typically do not achieve the desired
safetv benefits.
The city does not recommend installing 'Children at Plav signs within its boundaries.
Existing 'Children at Plav signs will be removed by the city that have previously been placed
without proper authorization and are not in compliance with this sign policy
'Deaf Child Area signs may only be installed in school zones if deaf children attend the
school. If installed, these signs will be removed when the deaf child no longer attends the
school.
Additional information concerning children at plav signs and deaf child area signs is
included in the Attachment G under the title Children at Plaj Signs.
Other Advisory or Advanced Warning Sign Reauests:
As with all other requests to review traffic issues in the Citv of Friendswood, requests for
advisor, or advanced warning signs will be addressed with the same measures outlined in the
Procedures section of this polio,
• Traffic Engineering and Operations will study the requested location and perforn an
advisor, advanced warning sign analysis which includes volunne of pedestrian traffic,
proximity of the subject location to schools, parks, swimming pools, retail centers, bike
and bike facilities, vehicular traffic volume, etc.
• The requesting partv will be inforned that it is Citv poliev to only install advisor, or
advanced warning signs that are in accordance with the Texas Manual on Uniform
Traffic Control devices, latest edition.
Other Public Safety and Traffic Issue Reauests:
Other requests to review traffic issues in the Citv of Friendswood will be addressed with the
same measures outlined in the Procedures section of this poliev
Engineering shall attempt to convev the proposed changes with the impacted residents
before anv modifications or improvements are implemented.
Revised ol'l 1'2o2l Appendix G Page 14 of 38
City of Fnendswood
Engineering Department
ATTACHMENT A
No Parking and Parking Zones
Parking Zones
Design Cntena Manual
APPENDIX G
Traffic Control Sign Policy
Commercial Zones are designated for commercial vehicles to load and unload merchandise for
up to 20 minutes Yellow zones are usually found in commercial areas for the use of adjacent
commercial areas
NO LOADING
AND
PARKING LDADING & UNLOADING
LOADING UNLOADING ONLY
ZONE ONLY ]U MINUTE LIMIT
Green Zones are used for limited term parking usually 20 minutes as indicated on a sign In
any limited parking you can receive a citation if you exceed the maximum limit by I minute or
more To avoid a citation you must vacate the parking space within the time limit specified
and let other members of the public use these high demand spaces
HOUR COMPACT
TWO PARKING CAR A
HOUR 8^RESERVED
m - 6PM PARKING
PARKING) FOR
ONLY FOR
MOTHERS
Red Zones indicate no parking at any time and are reserved for fire and emergency vehicles
Any other vehicle parked or encroaching on or in the red zone is considered a violation of the
parking restriction and may receive a ticket and/or be towed
NO NO ® E FIRE
PARKING PARKING LANE
FIRE LANE No
ANY Ro � o PARKING
N ® CwMD/Tiuo
TIME TOW AWAY rcwCTSMLL'c
�► ZONE PARKING „"ME OMNSE
Blue Zones are reserved parking spaces for vehicles used by disabled persons and displaying
the appropriate disabled parking placard or license plate
Revised 01/11/2021 Appendix G Page 15 of 38
City of Fnendswood Design Cntena Manual
Engineering Department APPENDIX G
Traffic Control Sign Policy
RESERVED
PARKING
® PARKING
ONLY
RESERVED
PARKING
VAN
ACCESSIBLE
Where is it illegal to park9
• No Parking Zones marked by No Parking, No Stopping, or No Standing signs
• In front of a private or public driveway
• In front of or within 15 feet of a Fire Hydrant
• Within marked or unmarked crosswalks An unmarked crosswalk is considered to be an
extension of sidewalk boundary lines across a street or driveway
• On sidewalks
• In public rights of way for the purpose of advertising or selling without proper
authorization
• In handicapped parking spaces without a legally obtained handicap placard or license
plate
• Where a vehicle will obstruct or block a handicapped parking space
• Within 30 on the approach to a flashing signal, stop sign, yield sign, or traffic control
signal located at the side of the roadway
• Within 3' of a handicap access ramp
• In stripped loading zones next to handicapped parking spaces
• Straddling the markings or lines designating a parking stall
• Along the curb return within 10' of an intersection
• Within marked hatched no parking areas
• Within 15' of the entrance to a fire or ambulance station
• Within 500' of fire trucks or emergency equipment when these are stopped answering a
fire alarm or emergency call
• Other areas as designated in the Texas State Transportation Code section 545 302 which
restricts parking even if no signs are posted
Parking areas for persons with disabilities
Parking areas for persons with disabilities, also known as handicapped parking spaces are
established for the exclusive use of vehicles transporting persons with disabilities Any vehicle
parked in a marked handicapped space or tow away zone parking space that does not display a
placard or license plate with the international symbol of access can be given a ticket, towed, and
impounded Handicap spaces can be established on public or private property if the property
owner and the City Engineer determine the need for such space/spaces
Revised O1/11/2021 Appendix G Page 16 of 38
City of Fnendswood
Engineering Department
4VC & KH
Design Criteria Manual
APPENDIX G
Traffic Control Sign Policy
TEXAS
0Vi3433
_ oisne�eo ver _
A citizen with a valid handicap placard or license plate is allowed to park in a regular metered
space without paying provided there are no other restrictions by signage For example No
Parking 7 — 9 AM or 4 — 6 PM However no one can park at meters in commercial
loading/unloading zones unless they possess and have visibly displayed in the vehicle a
commercial loading/unloading parking permit
How close to the curb must I park9
All vehicles parking parallel to the curb must park within 18 inches All vehicles parking at an
angle must have 1 front tire within 6 inches of the curb All parallel parking must have
passenger side to curb unless parked on a one way street
What is the maximum length of time I can park my vehicle on the street without moving it?
• Passenger vehicles cannot be parked on public streets for more than 48 hours
• Trailer/Semi Trailer cannot be parked on a public street for more than 2 hours
Revised 01/11/2021 Appendix G Page 17 of 38
City of Friendswood
Engineering Department
ATTACHMENT B
Commercial Truck Cut -Through
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Truck cut -through traffic trving to avoid congestion on major streets is a growing concern to
city residents. Local and residential streets were not typically designed to cam, high volume or
heavy loaded through traffic. This unnecessary through traffic generates noise, air pollution,
and creates other issues, including safetv for residents. Some trucks also try to park on narrow
residential streets, which also causes concerns for the residents and emergency vehicles.
Residents concerned with high volunnes of truck traffic traveling through, or parking in, their
neighborhood have several remedies available. The CAN, will evaluate the specific problems of
vour street and implement the most effective solution if the conditions warrant action.
Definitions of 'Commercial Vehicle' and 'Commercial Truck
A commercial vehicle can be defined as any vehicle that is used and maintained for commercial
purposes. A commercial trek is a commercial vehicle with more than 2 axles.
Cut -Through Traffic
Cut -through traffic can be defined as commercial vehicles passing through a neighborhood
without at least 1 trip end (origin or destination) in that neighborhood. Cut -through traffic
causes unwanted noise, dust, pollution, and safetv issues for residents. Cut -traffic can be
passenger vehicles, commercial vehicles, and, or commercial trucks. A cut -through commercial
vehicle or truck is one that passes through a street neighborhood without a scheduled stop in
that neighborhood.
hi additions to pollution and safetv issues, cut -through commercial traffic cause pavement
deterioration of the neighborhood roads since most neighborhood roads are not designed for
heavy commercial traffic.
Cut -through traffic is also defined as motorized vehicles cutting through a parking lot and, or
business to avoid heavv traffic or traffic control devices such as Stop,' ield Signs or traffic
signals.
Possible Solutions
If vour neighborhood has a high volunne of cut -through traffic, you can request a traffic study
by filling out the Traffic Concern form at www.ci.friendswood.tx.us,'350,'Publications-Fonns.
Upon receiving a completed request form, the Engineering will make an initial detennination of
the need for a study as in outlined in the procedures of this policy Counteractive measures such
as signage and enforcement, or traffic calming measures may be instituted.
Revised ol'll'_'o2l Appendix Page IS of38
City of Friendswood Design Cntena Manual
Engineering Department APPENDIX G
Traffic Control Sign Policy
Parking in Residential Neighborhoods
Residential neighborhoods which are in close proximity to busy commercial areas with limited
parking facilities or near a truck parking facility/compound, may find unwanted vehicles parked
in the neighborhood Commercial Vehicles cannot be parked on a public street overnight and
trailer/semi trailer cannot be parked on a public street for more than 2 hours
COMMERCIAL NO
VEHICLES COMMERCIAL COMMERCIAL
EXCLUDED VEHICLES VEHICLES
PROHIBITED
Revised 01/11/2021 Appendix G Page 19 of38
City of Friendswood
Engineering Department
ATTACHMENT C
Pedestrian Facilities
I. PEDESTRIAN SAFETY
The need for Pedestrian Safety
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Whether for school, work, or recreation, most of us walk ever, day However, some people have
to walk as their primary means of transportation or choose to walk to improve their health.
Whatever our reasons may be for walking, pedestrians have a legitimate right to walk without
feeling unsafe or uncomfortable. Since most of our roads were designed for vehicular traffic, we
need to improve walkability in our communities and make them safer for walking.
Typical Issues with Pedestrian Safety
The first step in improving pedestrian safety involves identifving the problem. Residents can
help identify the pedestrian safetv concerns in their neighborhoods. The following lists some of
the typical problems associated with pedestrian safetv and can be used as a guide in identifving
problems in a neighborhood.
Poor or Inadequate [FalkznQ Facilities
• Existing sidewalks and trails are insufficient and do not connect to schools, parks,
churches, etc. Dirt paths or desire lines show that more sidewalks or paths are needed.
• Existing sidewalks are not wide enough for people to walk comfortably or pass each
other
• Sidewalk surfaces are uneven, broken, or covered with debris.
• Sidewalks and paths are blocked by barriers such as vehicles, trash cans, vegetation,
utilitv poles, mail boxes, benches, or other obstructions.
• There is not enough space between the sidewalk and the roadway to make pedestrians
feel comfortable.
• The intersections are wide and crossing distances are long. Turning radii at the
intersections allow cars to turn at higher speeds.
• Bicyclists riding on the sidewalk (possiblv because thev do not feel safe in the street)
cause conflicts with people walking.
Unsafe Driver Behaviors or Traffic Characteristics
• Drivers do not stop or vield to pedestrians crossing the roadway
• Drivers drive too fast through neighborhoods, around schools, or near other places where
people are walking.
• Drivers take short cuts through neighborhoods to avoid traffic on major roads.
• Red light or stop sign runners endanger pedestrians and bicyclists.
• Drivers pass other vehicles stopped at crosswalks for pedestrians or pass stopped school
Revised ol'11'_'o2l Appendix G Page 20 of 38
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
buses.
• Drivers are more distracted than ever by cell phones, electronic media, passengers, and
other activities.
Unsafe Pedestrian Behaviors
• Pedestrians do not look both ways before crossing the street.
• Pedestrians attempt to cross the street when traffic is approaching.
• Pedestrians cross against pedestrian signals.
• Pedestrians crossing midblock where there are no crosswalks.
• Pedestrians, like drivers, can be distracted by cell phones and other electronic devices.
Typical Solutions
Once the problem or problems have been identified, the nest step is developing an appropriate
solution. Pedestrian transportation improvements or potential solutions for pedestrian safetv are
described in terms of the 'Four E s
1 Engineering — Phvsical changes to infrastructure (i.e. sidewalks, traffic signals,
signs, etc.) that affect the operation and movement of traffic and pedestrians.
2. Education — Includes strategies that aim to educate pedestrians, drivers, or other
groups in order to motivate a change in behavior
3 Enforcement — Community -based or law agency -based measures to enforce laws
and regulations related to pedestrians.
4 Encouragement — Efforts to promote walking and increase the level of walking
in a community
II. Pedestrian Crosswalks
Crosswalks
A crosswalk is typically defined as a designated portion of the roadway that pedestrians use to
cross the street. A crosswalk may be marked or unmarked. There is no legal difference between
marked and unmarked crosswalks at controlled intersections (those with stop signs or traffic
signals). However, marked crosswalks at mid -block locations provide a designated and legal
crossing zone for pedestrians.
1 Unmarked Crossiralks — most ever, intersection is considered to represent a
crosswalk, even if it is not marked as such. An unmarked crosswalk is basicall,
the extension of a sidewalk that extends across intersecting roads.
2. Harked Crossiralks — are those crosswalks marked with pavement markings.
Revised ol'l 1'2o2l Appendix G Page 21 of 38
City of Fnendswood
Engineering Departrnent
Design Cntena Manual
APPENDIX G
Traffic Control Sign Policy
usually 12 wide white pavement markings on 6 centers either plain
perpendicular crosshatched or 45 degree crosshatched
3 Enhancements — are traffic control devices or signals that enhance and aids the
safe movement of pedestrian traffic in the roadways
DO -
Benefits
Marked crosswalks guide pedestrians to a proper crossing location and alert motorists of a
pedestrian crossing point However at uncontrolled locations marked crosswalks may create a
false sense of security for pedestrians resulting in a greater number of pedestrian crashes (if
additional safety treatments are not provided)
City Policy on Marked Crosswalks
The City s current policy is to install marked crosswalks at controlled intersections where there
is a demonstrated need Crosswalks are also marked at established school crossings At other
locations an engineering study must be conducted to ensure that marked crosswalks are installed
only where there is significant pedestrian activity and/or based on engineering judgment The
need for and potential use of a proposed crossing varies with each location each should be
considered individually and with an effort to maintain consistency in the decision making
process Approval of marked intersection on state highways or an intersection of a state
highway and city road within the City Limits shall be coordinated with TxDOT
Categories of Marked Crosswalks
Marked crosswalk locations fit into 1 of 3 categories
1 Marked crosswalks are Standard on signalized approaches at intersections
2 Marked crosswalks alone (without other enhancements or treatments) are
Permitted on roadways with posted or 85th percentile speeds less than or equal to
35 mph if recommended as part of an engineering study and approved by the City
Engineer
3 Marked crosswalks with enhancements or active devices are installed on
roadways with posted or 85' percentile speeds greater than 35 mph if
recommended as part of an engineering study and approved by the City Engineer
Such enhancements might include traffic calming features (i e median refuge
Revised O1/11/2021 Appendix G Page 22 of 38
City of Friendswood
Engineering Department
islands, curb extensions, narrowed
illumination, or enhanced devices (i.e
pedestrian -activated signals).
III. Pedestrian Signals
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
travel lanes, traffic diverters, chicanes).
. advance signage), or active devices (i.e.
Why do some traffic signals have push button and signal indications for pedestrians and
others do not?
Pedestrian signals are primarilv installed for 2 reasons.
1 A high volume of pedestrian traffic present: or
2. The green time given for vehicles in a particular direction is not sufficient for
pedestrians to cross the roadway in that direction.
When signal indications for vehicles are easv to see and provide plenty of green time for
pedestrians to cross safelv push buttons and pedestrian signal indications are often not needed.
Push buttons are sometimes provided at intersections where the signal timing is typically
controlled by the volume of vehicular traffic. If traffic volumes are low at these intersections,
pedestrians will not have enough time to cross the street without push buttons. If pedestrian
crossing times were factored into ever, signal cycle, mativ intersections would become
inefficient and delav vehicles more than necessary The use of pedestrian push button allows
extra time to be provided onl, when a pedestrian is present.
What do pedestrian signals mean, and why isn't there enough time to cross the street
during the walk indication on a pedestrian signal?
The CAN, has in use the pedestrian signals that indicate illuminated svmbols of a walking person
and an upraised hand, along with a countdown timer of how manv seconds of time until the
pedestrian signal indicates 'Do Not Cross The signals are timed for an average walking
distance of 4 feet per second.
• The steadilv illuminated upraised hand indication means that a person should not enter
the roadway in the direction of the signal.
• The walk svmbol (the white colored walking person) means that a pedestrian may start
crossing the road toward the signal.
• The flashing orange upraised band means you can continue to cross, but there is not
adequate time to begin crossing. The purpose of the flashing indication is to keep
pedestrians from entering and intersection too late and to let pedestrians alreadv in an
intersection know that their time to finish crossing is becoming shorter, which is now
indicated by the countdown timer
Revised ol'11'_'o2l Appendix G Page 23 of 38
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDI K G
Traffic Control Sign Policy
Will pushing the pedestrian walk button several times make the signal change faster?
No, the walk button will send a message to the controller requesting a walk indication be granted
to the requested direction in the nest available signal cycle. Continuously pressing the
pedestrian button does not send additional messages to the controller since the controller has
alreadv acknowledged the pressing of the walk button with the first push.
Why do vehicles keep turning even when the pedestrian signal indicates that pedestrians
have the right to cross?
Pedestrian signals assign the right-of-wav for pedestrians to cross the street. However, since
right turns on red are allowed, some drivers may make right tunas without yielding to pedestrians
or do not see the pedestrian signals. This is why it is important to always be cautious when
crossing busy intersections. The following suggestions are offered in the interest of safetv
• Always cross intersections defensively
• When crossing the street, regardless of the availabilitv of signals, cross as quickly as
possible. Minimize vour time in the roadway
• Always watch for turning vehicles. I ou have the legal right to be there, but that does not
protect you from the carelessness of some motorists.
• Whether marked or unmarked, or signalized _-1LTV-1IS look both ways before crossing
the roadway
Revised ol'11'_'o2l Appendix G Page 24 of 38
City of Friendswood
Engineering Department
ATTACHMENT D
School Traffic Safety
School Traffic Safety Statistics
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
On average, each year 23 school -age children die in school related traffic accidents in the United
States. Out of these. 6 are occupants of school transportation and 17 are pedestrians. Based on
these statistics, the CAN, would like to stress the importance of pedestrian safetv around schools
and school buses. However, pedestrian safetv is not solely dependent upon the pedestrians
themselves but is ven, much dependent upon the driving practices of motorists near and around
schools and school buses.
I. AROUND SCHOOLS
Pedestrian Safety Tips for Children
Most people, and especially young children, cannot judge the speed, distance, and size of
oncoming vehicles. Parents should walk the route to school (or other destinations) with children
and point out safe and unsafe practices. This includes locations where children may go to catch a
bus.
• At a traffic signal, the green light or walk signal (the white walking person) means that
children should stop at the curb or edge of the road, look both ways for oncoming traffic,
and then if it is safe, cross the street. Having the walk indication or green light does not
guarantee that cars will stop Pedestrians must always look for oncoming and turning
traffic even when they have the right of wav
• Before crossing the street, children may want to wait for a 'fresh green light. This
means that they wait for the nest new walk indication if the don t walk indication
(upright orange hand) is flashing and the countdown timer is nearing zero Doing this
gives them the most time to cross.
• If children are in the middle of the street and the don t walk indication begins flashing,
they should not stop or return to the curb or edge, but continue on to walk at their
maximum comfortable pace until they reach the other side. Thev should not nun as they
might fall.
• And Remember
Children crossing the street should be accompanied by an adult whenever
possible.
Avoid crossing streets at mid -block, especially when parked vehicles may
obstruct vision. Use stops signs, traffic signals, and crossing guards when
available.
Children should not follow others or nun to others when the call until a safe
crossing is available.
Revised ol'11'_'o2l Appendix G Page 25 of 38
City of Friendswood
Engineering Department
Vehicle Safety ground Schools
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Parents and other adults can do much to improve traffic safetv around schools by driving
cautiously teaching children safe practices, and limiting vehicle trips. Drivers should obev all
traffic laws and apply the following practices.
• Carpooling can reduce the number of vehicles near the school, especially during
inclement weather
• Avoid parking on the opposite side of the street from the school. When it is necessary
instruct children on bow to safelv reach the vehicle.
• Make sure that children are careful when opening vehicle doors and that they enter and
exit on the curbside of the vehicle. Children should not be allowed to cross in the middle
of the block to reach the vehicle.
• Drivers should not double park or block traffic. Waiting or parking in red zones is also
not allowed.
• Do not block buses or use areas designated for buses only If an emergency vehicle
requires access, the area should be cleared.
• Never leave a vehicle unattended in a loading zone.
• Do not park in a crosswalk or pass a stopped vehicle allowing pedestrians to cross.
• Do not violate the law by using the excuse 'I will just be here a minute when picking up
or dropping off children. N iolations still present a danger and cause congestion during
the time of day when it is most important to provide safetv for children and avoid
congestion.
• Leann the traffic patterns at and near a school to avoid being a disruption.
• Pav attention to children getting in and out of vehicles. Children sometimes forget to use
the curb side door and exit suddenly
Crossing Guards
The Citv is responsible for the assigimnent and designation of crossing guards for the schools
within the Citv Limits. Crossing Guards are emplovees under the Police Department and have
the force of law for traffic movements in school zones. Children and motorists should follow
their directions when directing traffic and helping children crossing the street.
II. AROUND SCHOOL BUSES
School Bus Safety — Children
When waiting for, riding, and exiting the school bus, children should follow these rules.
Getting on the School Bus
• When waiting for the school bus, stav away from traffic and avoid roughhousing or other
behavior that can lead to carelessness. Do not strav into streets, alleys, or private
propertv
Revised ol'11'_'o2l Appendix G Page 26 of 38
City fF e dsw d
Engi ee ng Department
Deg Cte Manal
APPENDIX G
Traffic Control Sign Policy
Lineup away from the street or road as the school bus approaches
Wait until the bus has stopped and the door opens before stepping into the roadway,
Use the handrail when stepping onto the bus
Behavior on the Bus
When on the bus find a seat and sit down Loud talking or other noise can distract the
bus driver and is not allowed
Never put head arms or hands out of the window nor throw anything out of the window
Keep aisles clear Books and bags are tripping hazards and can block the way in an
em rge cy
Befor y each y top get ready t 1 as, by geth g yo b k and b to gh g
together
At your stop wart for the bus to come to a complete stop before getting up from your
seat Then walk to the front door and exit using the hand rail
Getting RM Sch IBu
If you have to cross the street an front of the bus walk at least 10 feet ahead of the bus
along the side ofthe road until you can turn around and see the bus driver
Make sure the bus driver can see you
Went for a signal from the bus driver before beginning to cross
When the bus driver signals walk across the road keep an eye out for sudden traffic
changes
Stay away from the bus's rear wheels at all tines
School Bus Safety —Parents
If possible accompany children to school bus stop and help them get in and out
Teach children to follow common sense practices and ALWAYS STAY OUT OF THE
DANGER ZONE OF THE BUS
Sch IBu S fety Motorists
When backing out of a driveway or leaving a garage always watch out for children
walking or bicycling to school
Rev ed 01/11/2021 Appe d G Pag 27 f38
City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIX G
Traffic Control Sign Policy
• When driving in neighborhoods with school zones, watch out for young people who may
be thinking about getting to school but may not be thinking about getting there safely
• Slow Downl Watch for children walking in the street, especially if there are no
sidewalks in the neighborhood
• Slow down! Watch for children playing in and congregating near bus stops
• Be Alertl Children arriving late for the bus may dart into the street without looking for
traffic
• Learn to obey the school bus laws Learn the "flashing signal light system" that school
bus drivers use to alert motorists of pending actions
o Yellow Flashing Lights indicates that the bus is preparing to stop to load or
unload children Motorists should slow down and prepare to stop their vehicles
It also means that the motorist should NOT speed up to pass the bus before the red
flashing lights are on
o Red Flashing Lights and extended stop arms and stop signs indicate that the bus
has stopped, and that children are getting on or off Motorists must adhere to the
driving law below and only proceed when the red lights stop flashing and the
extended stop sign and bar is withdrawn, and the bus begins moving before they
can start driving again
■ Two Lane roadways, with traffic in both directions, both traffic lanes shall
stop
■ Multi -lane roadways with or without center turn lanes traffic shall stop in
both directions
■ Roadways divided by raised medians, the traffic traveling in the same
directions as the bus shall stop The traffic in oncoming direction on the
other side of the median shall slow and proceed with caution, but it is also
suggested that motorist stop for the ultimate safety
School Zone Signs and Operations
School zones may be installed on streets that border school property line and where students
cross a roadway The signs can be static or include flashers The flashers are usually installed
on roadways with more than 5,000 vehicles per day The signs conform to the standards and
specifications in the Texas Manual on Uniform Traffic Control Devices
SCHOOL
SPEED SPEED
LIMIT LIMIT
15 20
WHEN SCHOOL GAYS
FLASHING �pM SPM
School zone times shall be established and installed according to the following general
guidelines
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City of Friendswood Design Criteria Manual
Engineering Department APPENDIN G
Traffic Control Sign Policy
• Morning Times — 45 minutes before start to 15 minutes after the start of school.
• Midday — beginning to end of hunch period.
• Afternoon Times — 15 minutes before dismissal to 30 minutes after dismissal of school.
These times may be adjusted at each school based on individual campus requirements.
Parking Regulations
In order to promote safe and efficient traffic circulation around a school, it may be necessary to
regulate, restrict, or prohibit parking, stopping, or standing adjacent to the school grounds or at
an established school crossing. The Engineering Department will determine if the street needs
parking restrictions.
Crosswalk Location and Installation
Crosswalks are located to enhance the utilization of sidewalks, to serve school routes and to
define the appropriate crossing area in the street at high pedestrian volume intersections. When
reviewing an area for installation of a crosswalk, the proximity to a school is one factor Other
factors include volume of vehicular and pedestrian traffic, average vehicular speed, visibilitv
available to motorist and pedestrians, tvpe of traffic controls present, width of street to be
crossed, and location of adjacent crosswalks.
Revised ol'11'_o2l Appendix G Page 29 of 38
City of Friendswood
Engineering Department
ATTACHMENT E
Speed Limits
Authority
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Speed limits are set by statute by the Texas Transportation Code § 545 352. The statute specifies
the following speed limits.
• Streets in Urban Districts — 30 mph
• Allev in Urban Districts — 15 mph
• State or Federal numbered highways outside of Urban Districts — 70 mph. _Ativ other
highwav outside of the Urban District — 60 mph.
These are known as 'prima facie limits and do not require signs for enforcement. For example,
in the absence of anv other speed limits sign, the speed limit is 30 mph in residential districts
within the Citv Limits. The Citv Council may alter the maximum or prima facie speed limits
based on an engineering and traffic study on anv street or portion thereof within the Citv The
altered speed limits are posted regulator, speed limit signs (signs with black text on white
background) and are considered prima facie (or legal) for enforcement.
Speed Zoning
When an engineering study determines that statutory speed limits are not appropriate for the
existing road and traffic conditions, altered speed limits are established using speed zoning. The
tvpes of speed zones are
• Regulatory Speed Zones impose a restriction on a particular roadway and indicators of
the speed limitations imposed by plvsical and traffic conditions of the roadway
Regulator, speed limits are posted using regulator, speed limit signs which has black
lettering on white background as shown in the Texas Manual on Uniform Traffic Control
Devices for Streets and Highways (TXIUTCD).
• Construction Speed Zones may be regulator, or advisor, speed zones through a
construction project depending on the importance of speed control in the construction
zone. Construction advisor, signs are typically black lettering on an orange background.
• School Speed Zones are established in accordance with city policy on School Zone
Installation and Removal and in accordance with State Law Maximum speed reduction
allowed is 15 mph under the posted speed limit.
• 4dvisory or Warning Speeds are desirable speeds for curves, intersections, or other
locations where design standards or phvsical conditions of the roadway restrict safe
operating speeds to value less that the maximum legal speeds or posted regulator, speed
limit. Advisor, speed signs supplement other warning signs (such as for a curve) and
have a black message on a yellow background.
What is the Law?
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Engineering Department APPENDIN G
Traffic Control Sign Policy
All drivers are required to obev the posted speed limits. These limits are designed to provide for
the orderly flow of traffic under normal driving conditions. During periods of heavy traffic,
inclement weather, low visibilitv or other poor driving conditions, speed must be adjusted so
that accidents will be avoided. In the absence of posted speed limits, prima facie speed limits are
in effect. _illy speed in excess of the legal speed limit on that roadway will be considered prima
facie (or on the face of it") evidence that the speed is unreasonable, non -prudent, and unlawful.
How are Speed Limits Established?
Regulator, speed zones are established in accordance with the procedures described in the
TxDOT manual 'Procedures for Establishing Speed Zones Posted speed limits are set by the
85th percentile method, which represents the speed of the majoritv of drivers will be traveling at
or below Speed checks are conducted to determine the 85th percentile speed. The observed
free -flowing speed for vehicles is tallied and the 85th percentile speed is calculated using
collected data. To ensure a true reflection of normal traffic situation, speed checks are made on
average weekdays during off-peak hours, under favorable weather conditions.
The speed limit is nonmally set at the nearest value to the 85th percentile speed ending in 5 or 0.
The posted speed limit may be adjusted downwards of the 85th percentile speed based on the
following factors.
• Roadwav pavement width of 20 feet or less.
• Curves and bills.
• Hidden driveways and other developments.
• High number of driveways.
• Crash histom
• School crossings and characteristics of sites that generate traffic.
• Lack of striped, improved shoulders.
Once a speed limit is determined, the speed zone is added to the Ordinance 300 identifving the
limits and speed of the speed limit zone. _after approval by the Citv Manager, or their designee,
the sign shop is instructed to install the necessary signs at the locations approved and shown in
the Ordinance 300 memo
Speed Limit Misconceptions
Studies have shown that there is no significant change in speeds following the posting of a
revised speed limit. This is true whether the speed limit is increased or decreased. Safetv is also
not improved by establishing unreasonably low speeds limits. Some misconceptions about speed
limits include
• Reducing the speed limit will not slow the speed of traffic.
• Reducing speed limits will necessarily decrease the number of crashes and increase
safetv
• Having a posted speed limit is not necessarily safer than an umposted speed limit: and
• Drivers always go 5 to 10 mph over the posted speed limit.
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City of Friendswood
Engineering Department
Why Do We Need Speed Limits?
Speed limits which are realistic and reasonable:
• Encourage compliance from a majoritv of the drivers.
• Give a clear reminder of reasonable and prudent speeds.
• Provide an effective enforcement tool to the police: and
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
• Encourage drivers to travel at the speed where the risk of crash involvement is the lowest.
Studies have shown crash rates are lowest at around the 85th percentile speed. Drivers traveling
significantly faster OR slower than this speed are at greater risk for being in a crash. It is not
high speeds alone that relate to crash risk, it is variation of speed within the traffic stream. In
fact, on a per mile driven basis, high speed roadways, like interstates, have a lower speed -related
fatalitv rate than low speed roadways because large variations in speed within the traffic stream
create more conflicts and passing maneuvers (and opportunities for driver error and collisions).
However, unrealistic speed limits.
• Discourage voluntary compliance:
• Create perception of 'speed traps.
• Cause public antagonism toward the police:
• Create a bad image for a community in the eves of non-residents, and
• May increase the potential for crashes.
Revised ol'11'_'o2l Appendix G Page 32 of 38
City of Friendswood
Engineering Department
ATTACHMENT F
Intersection Controls
I. STOP SIGNS
Stop Signs
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
A STOP sign is a sign used to direct motorists to stop at the spot where the STOP sign is located.
STOP signs are a method for controlling traffic at intersections where the normal application of
the right-of-wav rule is insufficient to ensure safetv and provide reasonable compliance with the
law These signs are found on the right side of the roadway (and in some cases in the median to
increase visibilitv). When more than two directions are controlled by STOP signs, then a
supplemental ALL WAI plaque shall be used to inform motorists of the tvpe of traffic control
that exists at the intersection. If a STOP sign is in its correct location and it cannot be seen very
well due to hills or curves, a STOP AHEAD warning sign may be used in advance on the
approach to the STOP sign.
Installation Police
STOP sign installations will be addressed according to the Citv of Friendswood Sign Policv
current edition. STOP signs at an intersection are installed only upon the approval of the Citv
Engineer and reflected in the Ordinance 300, after a careful investigation has been made of
existing conditions. The investigation is conducted using the guidelines for installing STOP
signs provided in the Texas Manual on Uniforu Traffic Control Devices (TMUTCD).
Should STOP Signs Be Used to Control Speeding in Neighborhoods?
This is a question that is frequently asked or requested from citizens concerned about speeding in
their neighborhood. Although the Citv does share the concerns of the citizens about speeding
and safetv in residential neighborhoods, the installation of STOP signs is not the appropriate wav
to solve the problem of speeding. STOP signs are traffic control devices intended for assigning
rights-of-wav not controlling speed. Traffic calming devices (as stated in the Citv s Traffic
Calming Policv) and police enforcement have been found to be much more effective in
controlling speeding.
STOP signs result in speed reduction only near the sign, and drivers tend to speed up between
STOP sign controlled intersections to make up for perceived lost time. According to National
Engineering Transportation Studv when required to stop by cross street traffic. 50 o to 200 o of all
drivers come to a complete stop. 400o to 600o will come to a rolling stop below 5 mph, and 200o
to 400 o will pass through at higher speeds.
Often, unjustified STOP signs are ignored by motorists, which can be more dangerous than
speeding. Therefore, it is the Citv s policv not to install STOP signs to control speeding.
Adverse Impacts of Unjustified STOP Signs.
• Unjustified STOP signs cause motorists frustration when they are forced to stop for no
Revised ol'11'_'o2l Appendix G Page 33 of 38
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Engineering Department
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
apparent reason. Unwarranted STOP signs result in disrespect for all signs and reduce
the effectiveness of STOP signs at other intersections where they are essential for safetv
• N chicle emissions account for much pollution in the air These emissions increase when
vehicles are accelerated and decelerated. It is important to minimize unnecessary stops
since steadv speeds increase fuel economy and reduce vehicle emissions. Unwarranted
STOP signs increase the number of unnecessary stops and reduce the efficiency of our
transportation system which results in increased air pollution.
IL YIELD SIGNS
Y ield Signs
At intersections where a frill stop is not necessary at all times, consideration should be first given
to less restrictive measures such as a FIELD A FIELD sign is used to assign rights -of -ways on
certain approaches to an intersection. N chicle controlled by a YIELD sign need to slow down to
a speed that is reasonable for the existing conditions or stop when necessary to avoid interfering
with conflicting traffic.
Installation Police
YIELD sign installations will be addressed according to the Citv of Friendswood Sign Policv
current edition. YIELD signs at an intersection are installed only upon the approval of the Citv
Engineer and reflected in the Ordinance 300, after a careful investigation has been made of
existing conditions. The investigation is conducted using the guidelines for installing YIELD
signs provided in the Texas Manual on Uniform Traffic Control Devices (TMUTCD).
III. TRAFFICSIGNAL INSTALLATION
Purpose
When warranted, properly designed, located, and operated, traffic control signals can provide
orderly movement of vehicular and pedestrian traffic, can reduce the frequency and severitv of
certain tvpes of crashes, and can increase the traffic handling capacity of the intersection. These
benefits have perpetuated a common belief that traffic signals provide the solution to all traffic
problems at intersections.
However, when unwarranted and improperly designed, traffic signals cause excessive delays,
driver frustration, disobedience, overuse of less adequate routes, and increased collisions. This is
why the Citv of Friendswood looks at ever, intersection being considered for signalization very
eareftilly to determine that a signal is indeed needed.
Signal installation requests, like all other requests for signage, starts with a traffic concern report
to the Engineering Department at www ci.friendswood.tx.us,'350,'Publications-Fonms. There will
be an initial review and determination as stated in the procedures in the Citv of Friendswood s
Sign Policv As is true with all warrant justifications, the same is true of Traffic Signals having
Revised ol'11'_'o2l Appendix G Page 34 of 38
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Engineering Department
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
to meet the analysis and standards in the Texas Manual on Uniform Traffic Control Devices
(TMUTCD).
Construction, Operation, and Maintenance
Once the signal is approved for placement, plans are created for construction. Depending on the
conditions at the intersection, it may require up to two vears to recommend design, and construct
a traffic signal. Once constructed, the traffic signal is maintained by either Texas Department of
Transportation (TxDOT) for signals on highways and Farm -To -Market Roads, Harris Countv in
Harris Countv or the CAN, in Galveston Countv If a traffic signal is malfunctioning, please
notify the Police Department.
Revised ol'11'_'o2l Appendix G Page 35 of 38
City of Friendswood Design Cntena Manual
Engineering Department APPENDIX G
Traffic Control Sign Policy
ATTACHMENT G
Children At Play Signs
We Have a Lot of Small Children in Our Neighborhood, can we get a "Children at Play"
sign9
The City of Friendswood often receives a lot of requests to install signs warning drivers of the
possible presence of "Children at Play " However, these signs may give a false sense of security
and have been proven to be ineffective In residential areas within the City, drivers should
expect children to be present Studies have shown that signs attempting to warn motorists of
normal conditions do not achieve the desired safety benefits
The City of Friendswood does not want to endorse that children can or should be allowed to play
safely on or near streets These signs are not warranted or part of the Texas Manual on Uniform
Traffic Devices (TMUTCD) Current Children at Play signs exist in the city in residential areas
but will not be replaced if faded, stolen, or destroyed However, the City does have in place a
process wherein the HOA can petition for these types of signs to be put in their neighborhood in
the rights of way These will still need to follow the typical procedures for all other signage
with the addition of the following
• The HOA will have to submit minutes that this was approved at a general HOA meeting
with advanced notification relayed to residents of the proposal to install these signs
• There will need to be a plan establishing the locations of the signs to be installed
• If approved by the HOA and the Traffic Committee, the HOA would have to purchase the
signs, sign bases, and poles and bring them to the Engineering Department The City will
install the signs at the agreed upon locations that have been approved
• The signs would have to be added to the insurance policy of the HOA
• As stated previously, stolen, damaged, or faded sings will not be replaced by the City
SLOW SLOW CAUTION
CHILDREN Cpu �N /� CHILDREN
PLAYING AT PLAY
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City of Friendswood
Engineering Department
ATTACHMENT H
Speed Bumps, Humps, and Lumps
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
Speed Bumps. Humps, and Lumps are traffic calming devices that use vertical deflection to slow
vehicular traffic in order to improve safetv conditions. Although their uses are effective in
keeping vehicle speeds down, engineering studies have shown that drivers will increase their
speed in between vertical speed traffic calming devices to make up for perceived lost time due to
slowing down to negotiate the vertical device.
Speed Bumps
Speed Bumps are an abrupt raised area in the pavement surface, effective at controlling speeds
on low volume private driveways and parking lots and have the following characteristics.
• Tvpically thev are 3 to 6 inches in height with a travel lane width of 6 to 12 inches.
• Cause significant driver discomfort at typical residential speeds.
• Cause vehicles to slow at 5 mph or less at the bump
• Considered an increased liabilitv risk on public roads.
• Trek, Emergency Response, cargo, and bus passengers more likely to be affected.
• Maintenance headache.
Speed Humps
Speed Humps are a gradual raised area in the pavement surface and are tvpically for use in
residential and low speed roadways, and have the following characteristics.
• Thev are tvpically 3 1 inches in height with a travel length of 4 to 6 feet.
• Create a gentle rocking motion slowing most vehicles down to 15 to 20 mph, and 25 to
30 mph when properly spaced.
• Thev are tvpically painted to identify vertical change in the roadway
• Need to be properly designed, marked, and signed according to standards in the
TNIUTCD
• Effective at controlling speeds without creating accidents or imposing unreasonable or
unacceptable safety risks.
• Either permanent bituminous ones or portable ones can be installed: there are pros and
cons to each type.
• Can be utilized as a raised crosswalk as well.
Speed Lumps
Speed Lumps are relatively new and have the effect of slowing vehicles down as does a speed
bump, but the main problem is that speed humps still cause ALL traffic to slow down. Speed
lumps are a hybrid combination of speed bumps and bumps. Speed lumps are in a nominal size
and placed with a gap between them. This gap is spaced (normally 2 feet) so that emergency
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Engineering Department
Design Criteria Manual
APPENDIN G
Traffic Control Sign Policy
vehicles, such as fire trucks and ambulances, which have a wider wheel base width, can easilv
transverse the gaps where normal vehicles cannot. Added to the safetv issue is that the edges
near the gaps are either parabolic or flat.
Revised ol'11'_'o2l Appendix G Page 38 of 38
City of Fnendswood
Engineering Department
APPENDIX H
Streetlight Policy
I SUMMARY
Design Criteria Manual
APPENDIX H
Streetlight Policy
The goal of this policy is to provide for effective procedures for review approval and
installation of streetlighting throughout the City of Friendswood This Policy will
enforce requirements specifically targeting areas where existing lighting conditions are
deemed to be insufficient for public safety and areas of new residential, commercial, and
industrial development
II GENERAL
Streetlight installation is intended as the basis for fixed lighting on all roadways Careful
considerations shall be taken in making streets and roadways safe during hours of
darkness Certain criteria as shown in the Warranting section of this policy shall be a part
of the evaluation process for the need of streetlights Streetlights are to be installed on
City owned streets to illuminate the roadway They are not to be installed on private
streets, parking lots, or for security lighting A street segment shall be in the City Limits
in order to be eligible for streetlights All streetlights are installed owned and
maintained by Texas New Mexico Power Company (in Galveston County) or
CenterPoint Energy (in Harris County) Once a streetlight is installed the City shall pay
the monthly operating and maintenance cost of the streetlight
III WARRANTING
The Warranting Process that is used is based on the Transportation Association of
Canada (TAC) Guide for Roadway Lighting (27) which was based on the Roadway
Lighting Handbook published by the US Department of Transportation This Streetlight
Warrant system is conditional based and not observed based system Factors that are
taken into consideration are divided into four sections 1) Geometric, 2) Operational, 3)
Environmental and 4) Collision Each individual factor is rated from 1 to 5 in
accordance with the parameters listed in the warranting worksheet Each individual
factor is weighted as a percentage of the whole and on a point system of 0 to 100 the
warranting condition must achieve a minimum of 60 points to warrant the installation of a
streetlight, yet the City Engineer is the final authority of approval for a streetlight
a GEOMETRIC SECTION
There are eight factors that are considered under the Geometric Section of the
Streetlight Warranting Process
• Total number of lanes including center turn lanes
Revised O1/11/2021 Appendix H Page 1 of 5
City of Fnendswood
Engineering Department
• Width of the lanes
• Number of median openings per mile
• Number of driveways and entrances per mile
• Horizontal curve radius
• Vertical grade
• Sight distance
• Parking
b OPERATIONAL SECTION
Design Criteria Manual
APPENDIX H
Streetlight Policy
There are five factors that are considered under the Operational Section of the
Streetlight Warranting Process
• Signalized intersections
• Left turn lanes
• Median width
• Posted speed
• Pedestrian activity
c ENVIRONMENTAL SECTION
There are five factors that are considered under the Environmental Section of the
Streetlight Warranting Process
• Percentage of development adjacent to roadway
• Area classification
• Distance from development to roadway
• Ambient lighting
• Raised median curb
d COLLISON SECTION
There is only one factor in the Collision Section of the Streetlight Warranting
Process This is a Night to Day ration of accidents occurring on the street that is
being reviewed
Lighting is warranted where a total point score of 60 or more is achieved Lighting of
equal scores may be prioritized by also using the different sections in the Warranting
Worksheet
IV NEW SUBDIVISION INSTALLATION
As per the approved Streetlight Policy for New Development approved by Friendswood
City Council Action, the following shall apply
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City of Friendswood
Engineering Department
Design Criteria Manual
APPENDIX H
Streetlight Policy
a All subdivision plats shall include a provision for streetlighting using concrete
poles
b Streetlights shall be provided at all corners and intersections and in addition at
two hundred fifty (250) foot intervals along residential streets Additional lights
may be required at the option of the City Engineer
c Each streetlight shall be at least one hundred (100) watts on local and collector
streets and two hundred fifty (250) watts on major thoroughfares
d All necessary easements for streetlighting shall be shown on the final plat prior to
final approval by the City and the Planning and Zoning Commission
e The City shall authorize the installation of public streetlights after acceptance of
the subdivision by the City for the contractor's one year maintenance period
V PRIVATE SUBDIVION INSTALLATION
a The Developer/Owner may install a private streetlight system in accordance with
the standards outlined above, except that ornamental poles other than concrete
may be used Wood poles shall not be used in any new streetlighting system
b The Developer/Owner shall be required to provide for the installation of this
private streetlight system and also provide for its perpetual operation and
maintenance
c The final plat shall indicate that streetlighting is private and this shall also be
labeled on all construction plans
VI EXSISTING SUBDIVISION INSTALLATION
The City's franchise utilities Texas New Mexico Power (in Galveston County) and
CenterPoint Energy (in Harris County) have established programs for installing
streetlights in the City The City will evaluate all requests for streetlights within the
guidelines of this policy and the warranting system
a STREETLIGHT POLE TYPES
In all cases, any pole to be installed shall match any existing poles already
installed inside the subdivision
• Wooden Poles — lights shall only be installed on existing wooden utility
poles served by overhead distribution The light shall be installed on the
existing wooden pole An additional wooden pole may be installed to
serve a specific need Other than stated previously, no wooden shall be
used in areas where the power is distributed underground
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City of Fnendswood
Engineering Department
Design Criteria Manual
APPENDIX H
Streetlight Policy
• Concrete Poles — shall be installed on other areas such as
commercial/industrial/collector roads within the city limits
• Metal Poles — shall be used on all thoroughfare roads inside the City
Limits
• The exception to the aforementioned poles would be the streetlights
required in the Downtown District by the Design Criteria Manual
b STREETLIGHT SPACING AND PATTERN
• All intersections shall have a minimum of one (1) streetlight
• Undivided roadways less than sixty (60) foot width from back of curb to
back of curb shall stagger the streetlightmg along both sides of the
roadway
• Undivided roadways greater than sixty (60) foot width from back of curb
to back of curb shall pair the streetlightmg along both sides of the
roadway
• Divided roadways shall pair the streetlightmg along both sides of the
roadway or as an option approved by the City Engineer substitute one (1)
streetlight in the middle of the median/dividing device in lieu of two (2)
along both inside lanes of the divided roadway
• Spacing in rural areas that have large acreage lots may be extended to five
hundred (500) foot spacing and staggered along both sides of the roadway
c STREETLIGHT COST
The cost of installing new or additional streetlightmg would be absorbed by the
City of Friendswood, however in the event that there is not available power on the
roadway (either overhead or underground) the City would partner with the
Homeowners Association (HOA) or other responsible entity
• In either case, the City would need to have a letter from the HOA or other
entity approving the installation and location of the new streetlight
• The HOA or other entity approving the installation would be required, if
power is not available in the Right Of Way of the roadway, to purchase,
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City of Fnendswood Design Criteria Manual
Engineering Department APPENDIX H
Streetlight Policy
provide have surveyed and recorded all necessary easements for the
installation of said pole
VII STREETLIGHT REOUEST PROCEDURE
a Applicant completes a request form (Exhibit "A") and submits to the Engineering
Department at www ci.friendswood tx us/350/Publications Forms
b Engineering informs approving authority of the request and steps needed to
complete the process
c Engineering gathers information for Warranting Worksheet
d Engineering draws Exhibits and forwards information to the City Engineer for
review
e After City Engineer approves, Engineering requests the City Manager approve the
installation of the streetlight and gives authorization to the appropriate franchise
utility to install
f The appropriate franchise utility reviews the streetlight request and conducts the
installation (if approved) of the proposed streetlight within a designated time
period
g Engineering distributes confirmation letter to the applicant and approving
authority giving an approximate date of installation
VIII LIGHTING PROBLEMS
All streetlights poles and wiring remain the property of the franchise utility If the
streetlight is not working properly, or is damaged please contact the appropriate franchise
utility
a Galveston County would be Texas New Mexico Power at (281) 996 0453
b Harris County would be Center -Point Energy at (713) 207 2222
Please give the franchise utility the pole number (approximately six (6) feet above
ground) facing the roadway If one is not visible, get the address or distance from the
nearest intersection
If tree limbs are blocking the light please call the Public Works Department at (281) 996
3380
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