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loo
Engineer:
HARLE ENGINEERING COMPANY
P.O. Box 11587
College Station, TX 77842
3002 Texas Avenue South
-r College Station, Texas 77845
(979) 693 -7191
Drainage Report
for
Castle Rock Subdivision
Phase 5
College Station, Texas
February, 2010
Developer.
- Greens Prairie Investors, Ltd.
4490 Castlegate Drive
College Station, Texas 77845
(979) 690 -7250
Drainage Report
for
Castle Rock Subdivision
Phase 5
College Station, Texas
February, 2010
Engineer:
HARLE ENGINEERING COMPANY
P.O. Box 11587
College Station, TX 77842
3002 Texas Avenue South
College Station, Texas 77845
(979) 693 -7191
Developer:
Greens Prairie Investors, Ltd.
4490 Castlegate Drive
College Station, Texas 77845
(979) 690 -7250
ENGINEER
HARLE ENGINEERING COMPANY
P.O. Box 11587
College Station, Texas 77842
Phone/Fax: (979) 693 -7191
OWNER/DEVELOPER
Greens Prairie Investors, LLC
4490 Castlegate Drive
College Station, Texas 77845
Phone: (979) 690 -7250
Description:
• Area:
• Proposed Land Use:
• # of Lots:
• Existing Land Use:
• Land Description:
Adjoining Land Use:
Primary Drainage Facility:
Flood Hazard Information:
FEMA FIRM..
Floodplain:
GENERAL STORMWATER PLAN
Castle Rock Subdivision, Phase 5
Drainage Report — Executive Summary
GENERAL DESCRIPTION AND LOCATION
Location: Castle Rock Subdivision, Phase 5, is located on the north side of SH 40, William
D. Fitch Parkway, near its intersection with Castle Rock Parkway.
6.513 acres
PDD- Single Family Residential
29 lots
Agricultural — consisting primarily of a wooded pasture used for cattle grazing
Rolling terrain that falls north toward Spring Creek. The site is heavily wooded.
The site is bounded on the south and west by developed sections of the Castle
Rock Subdivision, on the north by the future Phase 6 of the subdivision and on the
east by a greenbelt.
Spring Creek
# 48041CO205 D (February 9, 2000)
No portion of this Phase lies within the floodplain of Spring Creek or its
tributaries.
HYDROLOGIC CHARACTERISTICS
The existing site is predominately wooded. The elevations range from 281 to 287, sloping generally in a
northly direction where the runoff enters tributaries of Spring Creek, which ultimately flow into Spring
Creek on the adjacent tracts.
The drainage plan for this development will involve the installation of inlets, junction boxes and storm
sewer pipes for 2 separate systems, each of which will discharge into existing ditches which are located in
the future Phase 6 area of Castle Rock. These ditches are a tributaries of Spring Creek. The system on the
west end of the Phase connects to existing storm sewer pipes which are being constructed with Phase 4
which also collects the runoff from existing storm sewer systems constructed with Phases 1A, 2A, 2B and
3. The proposed storm sewer system on the east end of the Phase will connect to a storm sewer pipe
constructed with Phase 2A which currently discharges into a existing channel. The detention pond for this
proposed development is located downstream of this development, on Spring Creek, adjacent to SH 6, on
the Crowley Tract, which is being developed as the Tower Pointe development.
Page 1 of 3
COORDINATION & STORMWATER PERMITTING
The project will require that a Notice of Intent be submitted to the Texas Commission for Environmental
Quality. No other permits are anticipated for this project.
DRAINAGE DESIGN
General Information:
Street Design:
T Methodology:
71. Minimum
Design Storm Event:
Pipe Materials:
Manning's n Value:
Runoff Coefficients:
Design Constraints:
Stormwater runoff from Phase 5 of the subdivision will be collected by 2 separate
systems which discharge into existing ditches. The system on the west end of the
Phase primarily carries the runoff from previous Phases including some of Phase 4
while the system on the east end collects runoff from the east end of Phase 2A and
from future development areas of the Subdivision. The location of the drainage
areas for evaluation of the gutter depth check, inlet sizing and pipe evaluation are
shown on Exhibit A. Also shown are the location of the inlets, junction boxes and
storm sewer pipes.
In order to not have to construct open channels for the storm sewer pipes in Phase
4 to drain into and then fill these channels with the future development of Phases 5
and 6, storm sewer inlets, junction boxes and pipes are being constructed with
Phase 4 even though they are located in Phase 5 and Phase 6. The inlets and
storm sewer piping required for the street construction on the west end of this
Phase is now included with this construction. The system proposed for the east
end of this Phase collects the storm runoff from the proposed street and from the
existing street in Phase 2A as well as future development areas.
Standard cross - section (3% cross - slope, 27' B -B residential)
Lay down curb & gutter on residential streets
Asphalt pavement
Standard recessed curb inlets (5' and 10' in length)
TR 55
10 minutes
10 -year - residential street & storm sewer
Corrugated HDPE w /smooth interior, RCP, Profile Gasket in
accordance with ASTM C443, ASTM C78, Class III
0.013
0.60 for developed lots
Max. water depth in curb = 4.0 in. or 0.33 ft.
Min. flow velocity = 2.5 fps
Max. flow velocity = 15 fps
100 -yr storm runoff maintained within the ROW (4 inches above curb)
Design Software: Excel spreadsheets, DODSON HydraCalc Hydraulics
This software was used to compute pipe capacity, flowrate and velocity through
each pipe, and determine hydraulic grade line elevations at each inlet or junction
box. All of this information is shown in the summary tables in Appendix E.
Page 2 of 3
Applicable Exhibits:
DETENTION DESIGN
General:
CONCLUSION
CERTIFICATION
The College Station requirement for a 25% reduction in cross - sectional area of
pipes less than 27" diameter is achieved by using internal pipe diameters that are
less than the standard diameter. The 24" diameter pipe areas were reduced by 25%
and a 20.6" diameter pipe used in the analysis and the 18' diameter pipe areas were
reduced by 25% and a 15.6" diameter pipe was in the analysis.
Design Results The data presented in the Appendices indicates the gutter depth, inlet sizing and
pipe sizes are in accordance with the requirements of the design guidelines.
Exhibit A — Drainage Area Map
Appendix A — Technical Design Summary
Appendix B — Drainage Area Calculations
Appendix C — Depth of Flow in Gutter Summary
Appendix D — Inlet Design Summary
Appendix E - Pipe Design Summary
Stormwater runoff from Phase 5 and all previous and subsequent phases of the
Castle Rock Subdivision flow into Spring Creek upstream of the regional detention
facility constructed in 2001. This facility was designed to control stormwater
releases from the Castle Rock Subdivision and other adjoining properties. No
additional detention facilities are provided with the development of this project.
Based on the concurrence with the previous design calculations from Phases 1A,
2A, 2B, 3 and 4, the drainage system in Phase 5 of the Castle Rock Subdivision
will function within the requirements and restrictions of the College Station
Drainage Policy and Design Standards.
I, Joseph P. Schultz, Licensed Professional Engineer No. 65889, State of Texas, certify that this report for the
drainage design for Castle Rock Subdivision, Phase 5, was prepared by me in accordance with the provisions
of the Unified Stormwater Design Guidelines.
Jos ' • h P. r: chultz, P.E.
Page 3 of 3
d JOSEPH P. SCHULTZ
4-p% 65889 tl'UG ge
w� i? m / c r i'd
t�5 t 2 /C 4 1 0
APPENDIX A
Technical Design Summary
Part 2 — Protect Administration
Start (Page 2.1)
` " Engineering and Design Professionals Information
Engineering Firm Name and Address:
R vie r-4.1 h ee(4- Fjr'^^
do t (.58
C o l k 5`1 L - ;,,,„ I -r n
( 7 � 4 S
Jurisdiction
City: Bryan
✓ College Station
Date of Submittal:
re le r..<ey 2010
Lead Engineer's Name and Contact Info.(phone, e-mail, fax):
Joseet l P- 5 -E,PC 691.7) S/ .
# 6 79. 1/ fl jap5eArl+e kJ cr.zih.
Other:
f
Supporting Engineering / Consulting Firm(s):
Other contacts:
Developer / Owner / Applicant Information
Developer / Applicant Name and Address:
Grerrs Pro. rfe ►1vr5A - trS, L -
44 q Cost k 6�e e 1 C. f. 7 7�?3f5
Phone and e-mail:
�,9J -7ZS-
W 61 1��,�h'1f -�s� L
Property Owner(s) if iiot Developer / Applicant (& address):
50 Of /3 '
Phone and e-mail:
—
Project Identification
n
Development Name: C c f •f-) t k . 516 d• v f'e r I" k e,S e 5
Is subject property a site project, a single -phase subdivision, or part of a multi -phase subdivision?
14I w14-r — 1 11O5 e If multi - phase, subject property is phase 6 of '
.
Legal description of subject property (phase) or Project Area:
(see Section II, Paragraph B -3a)
. S�3 s 6 , k— o� -- -e 2e b-�/ - S ry st r, 5v /v-ci, A 41
If subject property (phase) is second or later phase of a project, describe general status of all
earlier phases. For most recent earlier phase Include submittal and review dates.
(" h of t 4 u tr.cl-a-r CtJh a/ 'e `.. .
General Location of Project Area, or subject property (phase):
14 : 1,.' per\ o. e�e- I-. PkO
ft L S (tit-L,..
In City Limits?
Bryan: acres.
Extraterritorial Jurisdiction (acreage):
Bryan: College Station:
College Station: ra • SI 3 acres.
Acreage Outside ETJ: —
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007
As Revised February 2009
Part 2 — Project Administration
Continued (page 2.2)
Project Identification (continued)
Roadways abutting or within Project Area or
subject property p�
W(�►�, � ` ;*� t a, w
ccfr rPAk -WI
Abutting tracts, platted land, or built
developments: 4
P `h o3e5 4 A--/ Z 4
Na Regulatory Watercourse(s) & Watershed(s):
A) ISM i: Oct; '4- 1"trefc
Tributary Basin(s):
5IV , 1 *-4 C r r -A
Plat Information For Project or Subject Property (or Phase)
Preliminary Plat File #: 5 D 0 b b 6
Final Plat
Status and
File #: — Date:
Name: C ci fi, ( .k Srbd:vf
VoI /Pg: Si4►n- Ile.) Z"/o -/a
If two plats, second name:
Status:
File #:
Date:
Zoning Information For Project or Subject Property (or Phase)
Zoning Type: J'el Ej
Case Date Status:
Proposed?
Case Code:
Zoning Type: Existing
Case Date Status:
or Proposed?
Case Code:
Stormwater Management Planning For Project or Subject Property (or Phase)
Planning Conference(s) & Date(s):
Participants:
Preliminary Report Required? N A Submittal
Date
Review Date
Review Comments Addressed? Yes r'% No In Writing? When?
Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation
explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any.
N ;Pr
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007
As Revised February 2009
Part 2 — Project Administration
Continued (page 2.3)
Coordination For Project or Subject Property (or Phase)
Note: For any Coordination of stormwater matters indicated below, attach documentation
describing and substantiating any agreements, understandings, contracts, or approvals.
Coordination
With Other
Departments of
Jurisdiction
City (Bryan or
College Station)
Dept.
Contact:
Date:
Subject:
N/�
Coordination With
Non jurisdiction
City Needed? /
Yes No �/
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
Brazos County
Needed?
Yes No
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
TxDOT Needed?
Yes No V
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
TAMUS Needed?/
Yes No V
Summarize need(s) & actions taken (include contacts & dates):
Permits For or Subject Property (or Phase)
As to stormwater management, are permits required for the proposed work from any of the entities
listed below? If so, summarize status of efforts toward that objective in spaces below.
Entity
Permitted or
?
Status of Actions include dates)
Actions ( include
US Army Crops of
Engineers ' /
No Yes �/
y �o v J
N F,,.4kr ffG'' ..
)
Pta i e r- �-"-1 f l e t oil I E/ rte : .
US Environmental
Protection Agency
No if Yes
Texas Commission on
Environmental Quali ..y
No Yes ay .y
G !
n r�`r'
«r.-4-
(Spoon
MIT-- cr 1 r7c 1C Li b,
/ J�
�� �qq (f- h fie i
C evi-r r/ a/
Brazos River
Authority
No .✓ Yes
et Psi f
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Start (Page 3.1)
Nature and Scope of Proposed Work
Existing: Land proposed for development currently used, including extent of impervious cover?
N Ere - li d t Gri- f
Site
Development
Project
(select all
applicable)
n/ / 4.
Redevelopment of one platted lot, or two or more adjoining platted, lots.
Building on a single platted lot of undeveloped land.
Building on two or more platted adjoining lots of undeveloped land.
Building on a single lot, or adjoining lots, where proposed plat will not form
a new street (but may include ROW dedication to existing streets).
Other (explain):
Subdivision
Development
Project
Construction of streets and utilities to serve one or more platted lots.
_Construction
of streets and utilities to serve one or more proposed Tots on
lands represented by pending plats.
Describe
Nature and
Size of
Pro s osed
Site proiects: building use(s), approximate floor space, impervious cover ratio.
Subdivisions: number of lots by general type of use, linear feet of streets and
drainage easements or ROW.
'L i 1 S
_. . I
a � (5 of S�/ c 5
Project
Is any work planned on land that is not platted
If yes, explain:
N
or on Ind for which platting is not pending?
No Yes
P EMA Floodplains
Is any part of subject property abutting a Named Regulatory Watercourse
(Section II, Paragraph B1) or a tributary thereof?
No t/ Yes
Is any part of subject property in floodplain
area of a FEMA - regulated watercourse?
No V Yes Rate Map ¢u o4ILeFoS r
Encroachment(s)
into Floodplain
areas plann ?
No
Encroachment purpose(s): Building site(s) Road crossing(s)
Utility crossing(s) Other (explain):
,J1 Pr
Yes
If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA-
approved Flood Study to define allowable encroachments in proposed areas? Explain.
/
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007
As Revised February 2009
Part 3 - Property Characteristics
Continued (Page 3.2)
Hydrologic Attributes of Subject Property (or Phase)
Has an earlier hydrologic analysis been done for larger area including subject property?
Yes
Reference the st (& date) here, and attach copy if not already in City files.
c 1.... b r'\g — 1-J 14__ ' �1'tQ.wtGi i.. - Zoa
L_0 rh t2 - w w P. o an J 4 Also c j Zoo ,
Is the stormwater
earlier study?
manage plan for the property in substantial
Yes V No If not, explain how
conformance with the
it differs.
No
If subject property
plan for the
is not part of multi -phase project, describe
stormwater management
property in Part 4.
If property is part of multi -phase project, provide overview of stormwater management plan
for Project Area here. In Part 4 describe how plan for subject property will comply
therewith.
4/
Do existing topographic features on subject property store or detain runoff?
Describe them (include approximate size, volume, outfall, model, etc).
1/ No Yes
Any known drainage or flooding problems in areas near subject property?
Identify:
No Yes
Based
(see Table
on location of
B -1 in Appendix
Detention is required.
study property in a watershed, is Type 1 Detention (flood c ntr9j) nee ed,?
B) Ir '1 e,o�p ( Y %�✓
Need must be evaluated. t" not required.
If the need for
Type 1 Detention
must be evaluated:
What decision has been reached? By whom?
How was determination made?
---
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Continued (Page 3.3)
Hydrologic Attributes of Subject Property (or P Ja se) (continued)
Does subject property straddle a Watershed or Basin divide? V No Yes If yes,
describe splits below. In Part 4 describe design concept for handling this.
Watershed or Basin
Larger acreage
Lesser acreage
Above - Project Areas(Section II, Paragraph B3 -a)
Does Project Area (project or phase) receive runoff from upland areas? V No Yes
Size(s) of area(s) in acres: 1) 2) 3) 4)
Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable
concentrated section(s), small creek (non-regulatory), regulatory Watercourse or tributary);
�. se 5- / _ -s •ue PL sJts Z 19 4 ��
� spec /w . c
c by -V ,,,.....0 +�j4' ', e k e e
Flow determination: Outline hydrologic methods and assumptions:
r y�.�
C -efi . , E t ek�h f J r.A, f ((V ;J -1 p 1 `Je ! I — we Ul
hJ'--t ("V`n_o`-
Does torm runoff drain from public easements or ROW onto or across subject property?
V No Yes If yes, describe facilities in easement or ROW:
Are changes in runoff characteristics subject to change in future? Explain
Ai O
Conveyance Pathways (Section II, Paragraph C2)
Must runoff from study property drain across lower➢roperties before reaching a Regulatory
Watercourse or tributary? No ii// Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies). , . + l
P w S a� 'I ,� �� . � jr-•:,..3t
of shr 4—r e O'c % s f 4C C - of C, -e e s `-``6 "' -
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007
As Revised February 2009
Part 3 — Property Characteristics
Continued (Page 3.4)
Hydrologic Attributes of Subject Property (or Phase)
(continued)
Conveyance Pathways (continued)
Do drainage
easements
exist for
part of
path
tr
any
(s)?
No
Yes
If yes, for what part of length? % Created by? plat, or
instrument. If instrument(s), describe their
provisions.
Pathway
Areas
Where runoff
property(ies).
G .'
,
_ �
�
must cross lower properties, describe characteristics
(Existing watercourses? Easement or Consent
1 owns p lee (7)
�� b e USA
:cf /Pavc1 111-
of abutting lower
aquired ?)
dA 74 Ccn ''`7
S evv\ ,Sew - "i
CRIr ‘ t 4. riser
Sher"∎ c `T re 6e-i. S ,j,I, C.rt.lc.
Nearby
Drainage
Facilities
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, lined channels, buried conduit, swales, detention ponds, etc).
(�% 7L , Vi) , .-1 5 <Fo r Se vv t/'
S C ry `,"∎ P <<v1oN$ C c•
Do any of
design?
these have hydrologic or hydraulic influence on
No (/Yes If yes, explain:
proposed stormwater
,,,;t1 c c��r.ds
/ -e l (-,,.,, se WV ,
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Start (Page 4.1)
Stormwater Management Concept
Discharge(s) From Upland Area(s)
If runoff
accommodate
flow section,
S o
,fe
5 4.1.
pnt ft
is to be received from upland areas, what design drainage features will be used to
it and insure it is not blocked by future development? Describe for each area,
discharge point
if or f ,. o n j c / i s $ 1/7 J-1 e sr 4) , .. a 4..0—
I _ q /J.• o u s..t, ..ph e...., Jr w.v
<r fi S.k...n - Co C •.. Orct /A -$ I' ./r r. � �t I_ ('
/ k f Pt(- e os'� e,.d o r/ 1 D 1 • ei c wt( be eth . . �- . /4 7" 7
S •
Discharge(s) To Lower Property(ies) (Section II, Paragraph El)
Does project inc a drainage features (existing or future) proposed to become public via
platting? V No Yes Separate Instrument? No Yes
Per Guidelines reference above, how will
runoff be discharged to neighboring
property(ies)?
Establishing Easements (Scenario 1)
Pre - development Release (Scenario 2)
Combination of the two Scenarios
Scenario 1: If easements are proposed, describe where needed, and provide status of actions
on each. (Attached Exhibit # )
� si c n er/ rl re .tits '� C . ` / "I r‘ p fOrot
Scenario 2: Provide general description of how release(s) will be managed to pre - development
conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit # )
Combination: If combination is proposed, explain how discharge will differ from pre -
development conditions at the property line for each area (or point) of release.
If Scenario 2, or Combination are to be used, has proposed design been coordinated with
owner(s) of receiving property(ies)? No Yes Explain and provide
documentation.
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept (continued)
Within Project Area Of Multi -Phase Project
Will project result
in shifting runoff
between Basins or
between
Water eds?
No
Identify gaining Basins or Watersheds and acres shifting:
What design and mitigation is used to compensate for increased runoff
from gaining basin or watershed?
Yes
How will runoff from Project
Area be mitigated to pre-
development conditions?
Select any or all of 1, 2,
and /or 3, and explain below.
1. With facility(ies) involving other development projects.
2 Establishing features to serve overall Project Area.
3. On phase (or site) project basis within Project Area.
1. Shared facility (type & locafon of facility; design drainage area served; relationship to size
of
Project Area): Exhibit # )
�/ n,
I /� L
Q� (Attac ��OJ� hed
0'CY��:o.n 1 � ± f cocci-cc) �Oe �( O wl 1'D�r
r r r� 1 or ,wl
�OWr54 ( - Ccw. aT i ' D�o�Ce.� G�jlGc. s
.1
2. For Overall Project Area (type & location of facilities): (Attached Exhibit # )
C to w-1 e1 l /ti C - rb uv-Ci- / �l e \ 1 /.r"�i,.� to/� ., o e/ y/
3. By phase (or site) project: Describe planned mitigation measures for (or sites) in
phases
subsequent questions of this Part.
0-
m N
V-
No aquatic echosystems proposed? V No Yes In which phase(s) or
project(s)?
CU
o-
co
c
rn
N O
0
Are other Best Management Practices for reducing stormwater pollutants proposed?
No V Yes Summarize type of BMP and extent of use:
y . //� /[ 1 / _r �j
sr 1-1- / � p' c e / Cf) -t l v v d- y � 7 /e e a rh
.�/
co I
2
Q
If design of any runoff - handling facilities deviate from provisions of B -CS Technical
Specifications, check type facility(ies) and explain in later questions.
Detention elements Conduit elements Channel features
Swales Ditches Inlets Valley gutters Ouffalls
Culvert features Bridges Other
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.3)
Stormviwater Management Concept (continued
Within Project Area Of Multi -Phase Project (continued)
Will Project Area include bridge(s) or culvert(s)? ✓ No Yes Identify type and
general size and In which phase(s).
If detention /retention serves (will serve) overall Project Area, describe how it relates to subject
phase or site proje h ical location, conveyance a pathway(s), construction sequence l:
-0,, r„„,' ri lOw. e LlsH de- e- r-,.-- <sfill • elf d/
C 6 rK n I l 4.- /0 2 CLW"'"1 �y c , l /y •
Within Or Serving Subject Property (Phase, or Site)
If property part of larger Project Area, is design in substantial conformance with earlier analysis
and report for larger area? ✓Yes No, then summarize the difference(s):
Identify whether each of the types of drainage features listed below are included, extent of use,
and general characteristics.
Typical shape?
Surfaces?
ditches use
Yes
Steepest side slopes:
Usual front s opes:
Usual back slopes:
Flow line slopes: least
Typica distance from travelway:
(Attached Exhibit # )
typical greatest
Are longitudinal culvert ends in compliance with B -CS Standard Specifications?
Yes No, then explain:
At intersections or otherwise, do valley gutters cross arterial or collector streets?
V No Yes If yes explain:
eets with c.
3utterused'
Jo �'
Are/alley gutters proposed to cross any street away from an intersection?
No Yes Explain: (number of locations ?)
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 – Drainage Concept and Design Parameters
Continued (Page 4.4)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
�.
a)
=
D
0
Q c
E
t g
ED.
IA
iu
Gutter line slopes: Least O. & '7 Usual ( . O Vo Greatest 1 •9 ?
Are inlets recessed on arterial and collector streets? Yes No If "no ",
identify where and why.
N //4
Will inlets capture 10 -year designstormflow to prevent
with arterial or collector)? V Yes No If
flooding of intersections (arterial
no, explain where and why not.
Will inlet size and placement
design storm throughout site
c c yi p er d
prevent exceeding allowable water
(or phase)? V Yes
spread for 10 -year
No If no, explain.
,C G
Saq curves: Are inlets placed at low points? Yes No Are inlets and
co t sized to prevent 100
Yes No Explain
-year stormflow from ponding at greater than 24 inches?
"no" answers.
Will 100 -yr stormflow be containepin
whole length of all streets?
"11 4k Svr-�1.�,� g
's r< e1 c G tiff_ le
combination of ROW
V Yes No If
and buried conduit on
no, des ribe were and why.
1 .-4- . F loe G
1 (kr -rit -0
( — dc^-.
o + s . - e4 S444
, icy t
s w" -'1
Do designs for curb, gutter, and
V Yes No If
1k et re,., ∎, - �:k : Lt - 4...
inlets comply with B -CS Technical Specifications?
not, describe difference(s) and attach justification.
a
}
aa)
N and
`L°z
E
°
co
Are any 12 -inch laterals used?
used.
No Yes
Identify length(s) and where
Pipe runs between system
access points (feet):
t
Typical so Longest Z S
I
Are junction boxes used at each
why.
bend? V Yes No
If not, explain where
Are down9('ream soffits at or below
Yes V No If not,
upstream soffits?
explain where and why:
Least amount that hydraulic
grade line is below gutter line
(system- wide):
11 1
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
a
u
v
. c
X 00
c E
c O
c c
Ea)
>,
c_
2 o
a a
E 15
i n N
III
0
to
c
0
.s1
3
O
Describe watercourse(s), or system(s) receiving system discharge(s) below
(include design discharge velocity, and angle between converging flow lines).
1) Watercourse (or system), velocity, and angle?
f ( Ye ..er I SI..... 0a weJF el — e+. „o eec If p-' re 141)•1?.(..
fa ,r
r-s tlrr. pf,6 4., e , e,c(f a1/.cL‘ - eet /0661fe%e %�; le
2) Watercourse (or system), velocity, and angle?
5 t ,-,_ ,f l ,,,,m,_ ,C7 fie - 0 'l w"/ 4- 1" — - vAll e,c- 's f i,� 41:1-tie‘
3) Watercourse (or system), velocity, and angle?
For each outfall above, what measures are taken to prevent erosion or scour of
re and all facilities at juncture?
1) jbk. , "l o P.” Lir•'rf Or ://-4-) �4.1
r � 1 J a v 2 r e of. .e£ ^ill.?( p' '�c
2 ) / �` / 4)
it. ��
•- Z • ,-, (04 e S t d (ry --.5 j 1 c," .� • 1/ e l oc :Li : -"N
rr /k 4 •41 ( 5 L G ' Cr s.
cs-
a)
m u)
an }
c
m
00 4
)
y I
N
¢`
I 0
Are swale(s)
Number
situated along property lines between properties? No Yes
of instances: For each instance answer the following questions.
Surface treatments (including low -flow flumes if any):
Flow line slopes (minimum and maximum):
Outfall characteristics for each (velocity, convergent angle, & end treatment).
Will 100
ROW
-year design storm runoff be contained within easement(s) or platted drainage
in all instances? Yes No If "no" explain:
SECTION IX
Part 4 — Drainage Concept and Design Parameters
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Continued (Page 4.5)
Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 - Drainage Concept and Design Parameters
Continued (Page 4.6)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, r Site) (continued)
Roadside Ditches
Are roadside ditches used? V No Yes If so, provide
the following:
? Yes No
Is 25 -year flow contained with 6 inches of freeboard throughout
Are top of banks separated from road shoulders 2 feet or more?
Are all ditch sections trapezoidal and at least 1.5 feet deep?
Yes No
Yes No
For any "no" answers provide location(s) and explain:
(on separate sheet provide same information for any additional instances)
If conduit is beneath a swale, provide the following information (each instance).
Instance 1 Describe general location,
approximate length:
Is 100 -year design flow contained in conduit/swale combination?
If "no" explain:
Yes No
Space for 100 -year storm flow? ROW Easement Width
Swale Surface type, minimum
Conduit Type and size, minimum
and maximum
and maximum slopes:
slopes, design storm:
Inlets Describe how conduit is loaded
(from streets /storm drains, inlets by type):
Access Describe how maintenance
access is provided (to swale, into conduit):
Instance 2 Describe general location,
approximate length:
Is 100 -year design flow contained in conduit/swale combination?
If "no" explain:
Yes No
Space for 100 -year storm flow? ROW Easement Width
Swale Surface type, minimum
Conduit Type and size, minimum
and maximum
and maximum slopes:
slopes, design storm:
Inlets Describe how conduit is loaded
(from streets /storm drains, inlets by type):
Access Describe how maintenance
access is provided (to swale, into conduit):
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.7)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
WiII swales without buried conduit receive runoff from
public ROW or easements? No Yes. Explain
If "yes" provide the following information for each instance:
Instance 1 Describe general location, approximate length, surfacing:
Is 100 -year design flow contained in swale? Yes No Is swale wholly
within drainage ROW? Yes No Explain "no" answers:
Access Describe how maintenance access is provide:
Instance 2 Describe general location, approximate length, surfacing:
Is 100 -year design flow contained in swale? Yes No Is swale wholly
within drainage ROW? Yes No Explain "no" answers:
Access Describe how maintenance access is provided:
Instance 3. 4, etc. If swales are used in more than two instances, attach sheet
providing all above information for each instance.
Chanr,irrrprovements proposed?
No Yes Explain
"New" channels: Will any area(s) of concentrated flow be channelized (deepened,
widened, or straightened) or otherwise altered? No Yes If only slightly
shaped, see "Swales" in this Part. If creating side banks, provide information below.
Will design replicate natural channel? Yes No If "no ", for each instance
describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year
design flow, and amount of freeboard:
Instance 1:
Instance 2:
Instance 3:
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.8)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Channel Improvements (continued)
Existing channels (small creeks): Are these used? No Yes
If "yes" provide the information below.
Will small creeks and their floodplains remain undisturbed? Yes No How
many disturbance instances? Identify each planned
location:
For each location, describe length and general type of proposed improvement
(including floodplain changes):
For each location, describe section shape & area, flow line slope (min. & max.),
surfaces, and 100 -year design flow.
Watercourses (and tributaries): Aside fr /m fringe changes,
are Regulatory
Explain below.
Watercourses proposed to be altered? J No Yes
Submit full report describing proposed changes to Regulatory
existing and proposed section size and shape, surfaces, alignment,
length affected, and capacity, and provide full documentation
and data. Is full report submitted? Yes No
Watercourses. Address
flow line changes,
of analysis procedures
If "no" explain:
All Proposed Channel Work: For all proposed channel work,
provide information
requested in next three boxes.
If design is to replicate natural channel, identify location and length here, and describe
design in Special Design section of this Part of Report.
r \P
Will 100 -year flow be contained with one foot of freeboard? Yes No If
not, identify location and explain:
N \0 '
Are ROW / easements sized to contain channel and required
Yes No If not, identify location(s) and explain:
maintenance space?
0rl'e
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.9)
Stormwater Management Concept (continued) ?
C trb..1"
ow (-_
Within Or Serving Subject Property (Phase, or Site) (continued) ` s �
,d -4, r r e , j
1
How many facilities for subject property project? For each provide info. below.
For each dry-type facilitiy:
Faci
ity 1
Faci
ity 2
Acres served & design volume + 10%
100 -yr volume: free flow & plugged
Design discharge (10 yr & 25 yr)
Spillway crest at 100 -yr WSE?
yes no
yes no
Berms 6 inches above plugged WSE?
yes no
yes no
Explain any "no" answers:
For each facility what is 25 -yr design Q, and design of outlet structure?
Facility 1:
Facility 2:
Do outlets and spillways discharge into
Facility 1: Yes No
a public facility
Facility 2:
in easement
Yes
or ROW?
No
If "no" explain:
For each, what is velocity of 25 -yr design discharge
Facility 1: & Facility
at outlet?
&
at spillway?
2:
&
Are energy dissipation measures used?
location:
No Yes
Describe type and
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
Facility 1:
Facility 2:
For each, what measures are taken to prevent erosion or scour at receiving facility?
Facility 1:
Facility 2:
If berms are used give heights, slopes and surface treatments of sides.
Facility 1:
Facility 2:
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.10)
S tormwater M anagement Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Detention Facilities
(continued)
Do structures comply with B -CS Specifications? Yes or no, and explain if "no ":
Facility 1;
N1
Facility 2:
For additional facilities provide all same information on a separate sheet.
Are parking areas to be used for detention? No Yes What is
maximum depth due to required design storm?
Are culverts used at private crossings?
■o Yes
Roadside Ditches: Will culverts serve access driveways at roadside ditches?
V No Yes If "yes ", provide information in next two boxes.
Will 25 -yr. flow pass without flowing over driveway in all cases? Yes No
Without causing flowing or standing water on public roadway? Yes No
Designs & materials comply with B -CS Technical Specifications? Yes No
Explain any "no" answers:
Are culverts parallel to public roadway alignment? Yes No Explain:
Creeks at Private Drives: Do private driveways, drives, or streets cross drainage
ways that serve Above - Project areas or are in public easements/ ROW?
No Yes If "yes" provide information below.
How many instances? Describe location and provide information below.
Location 1:
Location 2:
Location 3:
For each location enter value for:
1
2
3
Design year passing without toping travelway?
Water depth on travelway at 25 -year flow?
Water depth on travelway at 100 -year flow?
For more instances describe location and same information on separate sheet.
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.11)
Stormwater Management Concept, (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
il
c
Named Regulatory Watercourses (& Tributaries): Are culverts proposed on these
facilities? No Yes, then provide full report documenting assumptions,
criteria, analysis, computer programs, and study findings that support proposed
design(s). Is report provided? Yes No If "no ", explain:
Arterial or Major Collector Streets: Will culverts serve these types of roadways?
No Yes How many instances? For each identify the
0 n
>-
a>
.r
N
c
c
location and provide the information below.
Instance 1:
Instance 2:
Instance 3:
0
0 m
Yes or No for the 100 -year design flow:
1
2
3
E
o
.
Headwater WSE 1 foot below lowest curb top?
Spread of headwater within ROW or easement?
cm °
•N c
0 ca
o c
U 0
>,15
(0 0
O
o :
.0 y
m -0
a a)
m a
N c
as
y o
w
0
m c
< �,
L
E
2
Is velocity limited per conditions (Table C -11)?
E any "no" answer(s):
Minor Collector or Local Streets: Will culverts serve these types of streets?
No Yes How many instances? for each identify the
locat and provide the information below:
Instance 1:
Instance 2:
Instance 3:
For each instance enter value, or "yes" / "no" for:
1
2
3
Design yr. headwater WSE 1 ft. below curb top?
100 -yr. max. depth at street crown 2 feet or less?
Product of velocity (fps) & depth at crown (ft) = ?
Is velocity limited per conditions (Table C -11)?
Limit of down stream analysis (feet)?
Explain any "no" answers:
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
a-Ci
c
c
0
0
CO
t
d
All Proposed Culverts: For all proposed culvert facilities (except
driveway /roadside
boxes.
ditch intersects) provide information requested in next eight
Do culverts and travelways intersect at 90 degrees? Yes No If not,
identify location(s) and intersect angle(s), and justify the design(s):
Does drainage way alignment change within or near limits of
approaches thereto? No Yes If "yes" identify location(s),
culvert and surfaced
describe
change(s), and justification:
Are flumes or conduit to discharge into culvert barrel(s)? No Yes If yes,
identify location(s) and provide justification:
Are flumes or conduit to discharge into or near surfaced approaches
No Yes If "yes" identify location(s), describe
to culvert ends?
outfall design treatment(s):
Is scour /erosion protection provided to ensure long term stability of culvert structural
components, and surfacing at culvert ends? Yes No If "no" Identify
locations and provide justification(s):
Will 100 -yr flow and spread of backwater be fully contained
drainage easements/ ROW? Yes No if not, why
in street ROW, and /or
not?
Do appreciable hydraulic effects of any culvert extend downstream
neighboring land(s) not encompassed in subject property?
"yes" describe location(s) and mitigation measures:
or upstream to
No Yes If
Are all culvert designs and materials in compliance with B -CS
Yes No If not, explain in Special Design Section
Tech. Specifications?
of this Part.
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.13)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
a)
rn
v
m
Is a bridge included in plans
If "yes" provide the following
for subject property project? V No Yes
information.
Name(s) and functional classification of the roadway(s)?
What drainage way(s) is to be crossed?
A full report supporting all aspects of the proposed bridge(s)
hydrologic, and hydraulic factors) must accompany this summary
provided? Yes No If "no" explain:
(structural, geotechnical,
report. Is the report
.
Q
i
Is a Stormwater
Pollution Prevention
P (SW3P)
established for
project constr io
No Yes
Provide a general description of planned techniques:
/ f reti I re"- CortSf/ti .- el-- 1 /-
: � 1 e. JJ et. 4_41". i e If -0,C kJ/NA- ;FS"'
1
Special Designs — Non - Traditional Methods
Are a non - traditional methods
repli ation, BMPs for water quality,
No Yes If "yes" list
(aquatic echosystems, wetland -type detention, natural stream
etc.) proposed for any aspect of subject property project?
general type and location below.
Provide full report about the proposed
expected benefits. Report must
be compromised, and that maintenance
solution(s). Is report provided?
special design(s) including rationale
substantiate that stormwater management
cost will not exceed those
Yes No If "no" explain:
for use and
objectives will not
of traditional design
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.14)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Special Designs - Deviation From B -CS Technical Specifications
If any design(s) or material(s) of traditional runoff - handling facilities deviate from provisions of
B -CS Technical Specifications, check type facility(ies) and explain by specific detail element.
Detention elements Drain system elements Channel features
Culvert features Swales Ditches Inlets Outfalls
Valley gutters Bridges (explain in bridge report)
In table below briefly identify specific element, justification for deviation(s).
Specific Detail Element
Justification for Deviation (attach additional sheets if needed)
1)
2)
3)
4)
5)
Have elements been coordinated with the City Engineer or her /his designee? For each item
above provide "yes" or "no ", action date, and staff name:
1)
2)
3)
4)
5)
Design Parameters
Hydrology s
t
Is a map(s) showing all Design Drainage Areas provided ? Yes No
Briefly summarize the ran a of appl' tions male of the Rational F�ormuI : 1
// /� � L M A � K l n top 5 1. dip 0 C � ^ ` / r r1 L J
I / C
�` // N � / / few f ( d -'
What is the size and location of largest Design Drainage Area to which the Rational Formula
has been applied? 2.2 '1 acres Location (or identifier): 0 l4 70
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
C Gt-4 EGT' u-t 4reaL
STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Effective February 2007
e 406 - 20,76 Lref
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.15)
Design Parameters (continued)
Hydrology (continued)
In making deterpinations for time of concentration, was segment analysis used?
No t/ Yes In approximately what percent of Design Drainage Areas? 6 0 %
As to intensity- duration - frequency and rain depth criteria for
criteria other than those provided in these Guidelines used?
identify type of data, source(s), and where applied:
deter 'ning
V
No
runoff flows,
Yes
were any
If "yes"
For each of the stormwater management features listed below identify the storm return
frequencies (year) analyzed (or checked), and that used as the basis for design.
Feature
Analysis Year(s)
Design Year
Storm drain system for arterial and collector streets
i-lip_
"44
Storm drain system for local streets
Id 4' (6 o
10
Open channels
/kl/ -
NM
Swale /buried conduit combination in lieu of channel
rr
`(
Swales
le
r'
Roadside ditches and culverts serving them
v
if
Detention facilities: spillway crest and its outfall
',
e
Detention facilities: outlet and conveyance structure(s)
v
r'
Detention facilities: volume when outlet plugged
t
;
Culverts serving private drives or streets
r ,
`,
Culverts serving public roadways
ri
i'
Bridges: provide in bridge report.
r '
1
Hydraulics
What is the range of design flow velocities as outlined below?
Design flow velocities;
Gutters
Conduit
Culverts
Swales
Channels
Highest (feet per second)
—
'-
''
Lowest (feet per second)
Streets and Storm Drain Systems Provide the summary information outlined below:
Roughness coefficients used: For street gutters:
For conduit type(s) HO PC (C
0,01 b
0.014 0,013
I_ tt Coefficients:
SECTION IX
STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
APPENDIX D - TECHNICAL DESIGN SUMMARY
Effective February 2007
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.16)
Design Parameters (continued)
Hydraulics (continued)
Street and Storm Drain Systems (continued)
% 1( -Open
For the following, are asSGmptions other than allowable per Guidelines?
Inlet coefficients? ��// No Yes Head and friction losses No Yes
Explain any "yes" answer:
In conduit is velocity generally increased in the downstream direction?
Are elevation drops provided at inlets, manholes, and junction boxes?
Explain any "no" answers:
`/ Yes No
-— Yes No
Are hydraulic grade lines calculated3nd shown for design storm?
For 100 -year flow conditions? V Yes No Explain any
/Yes No
"no" answers:
What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify
each location and explain:
bf o lSct 0T I , p'19e
— ras(W e_ ATP_ l' µ
Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a?
Yes No
Outside of straight sections, is flow regime within limits of sub - critical
If "no" list locations and explain: rliA-
flow? Yes No
Culverts If plan sheets do not provide the following for each culvert, describe it here.
For each design discharge, will operation be outlet (barrel) control or inlet control?
Ni
Entrance, friction and exit losses:
N14
Bridges Provide all in bridge repo,
NJ
SECTION IX
STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
APPENDIX D — TECHNICAL DESIGN SUMMARY
Effective February 2007
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.17)
Design Parameters (continued)
Computer Software
What computer software has been used in the analysis and assessment of stormwater
management needs and /or the development of facility designs proposed for subject property
project? List them below, being sure to identify the software name and version, the date of the
version, ,a any applicable patches and the publisher '
l� � C c p l 5 c oof f o >L �,r 6- 6- na / �`
�ra ���C
t V "( 3 0 — /47 oilr, Fl `� I s f
Part 5 — Plans and Specifications
Requirements for submittal of construction drawings and specifications do not differ due to use of a
Technical Design Summary Report. See Section III, Paragraph C3.
Part 6 — Conclusions and Attestation
Conclusions
Add any concluding information here: ,
n„eS� S � C,49 oip (le J Gt, ter' /� e y rs ► S cif/'rf
v
G '1
�� N
Attestation
Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical
Design Summary Drainage Report by signing and sealing below.
"This report (plan) for the drainage design of the development named in
by me (or under my supervision) in accordance with provisions of the
Unified Drainage Design Guidelines for the owners of the property. All
required by any and all state and federal regulatory agencies for the
improvements have been iss ed or fall under applicable general permits."
i 1
Part B was prepared
Bryan /College Station
licenses and permits
proposed drainage
AC -\ (..., � 1
0 *: x Oh
.. JOSEPH P. SCHULTZ 0
3 . A ie 8 ` i + •
t"1. °fir: : •
it 1
(Affix Seal)
Licens d Professional Engineer
State of Texas PE No sB
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
H a,'4 6 --5.
53
' �
AL 11r
2 i'o - / o
Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
APPENDIX B
Drainage Area Calculations
Area #
Area, A
(acres)
C
10 year storm
100 year storm
t
(min)
1
(in /hr)
Q10
(cfs)
1 100
(in /hr)
Q1oo
(cfs)
501
1.220
0.60
10.0
8.635
6.32
11.639
8.52
502
0.960
0.60
26.0
5.367
3.09
7.316
4.21
502A
0.520
0.60
10.0
8.635
2.69
11.639
3.63
503
0.350
0.60
10.0
8.635
1.81
11.639
2.44
503A
0.340
0.60
10.0
8.635
1.76
11.639
2.37
504
0.520
0.60
11.5
8.136
2.54
10.979
3.43
505
0.160
0.60
10.0
8.635
0.83
11.639
1.12
505A
0.140
0.60
10.0
8.635
0.73
11.639
0.98
506
0.410
0.60
10.0
8.635
2.12
11.639
2.86
507
1.100
0.60
27.8
5.163
3.41
7.046
4.65
508
1.760
0.60
33.3
4.636
4.90
6.348
6.70
509
0.240
0.60
10.0
8.635
1.24
11.639
1.68
510
0.800
0.60
10.0
8.635
4.14
11.639
5.59
511
0.100
0.60
10.0
8.635
0.52
11.639
0.70
601
0.050
0.60
10.0
8.635
0.26
11.639
0.35
602
0.940
0.60
10.0
8.635
4.87
11.639
6.56
701
2.290
0.60
10.0
8.635
11.86
11.639
15.99
702
0.930
0.60
10.0
8.635
4.82
11.639
6.49
703
0.990
0.60
10.0
8.635
5.13
11.639
6.91
704
0.520
0.60
10.0
8.635
2.69
11.639
3.63
801
1.880
0.60
10.0
8.635
9.74
11.639
13.13
802
1.570
0.60
23.1
5.739
5.41
7.808
7.36
803
1.860
0.60
10.0
8.635
9.64
11.639
12.99
Castle Rock Subdivision - Phase 5
Drainage Area Summary
The Rational Method:
Q = CIA
Q = Flow (cfs)
A = Area (acres)
C = Runoff Coeff.
I = Rainfall Intensity (in /hr)
Brazos County:
I = b / (t +d)
t = Time of concentration (min)
10 year storm
b = 80
d = 8.5
e = 0.763
100 year storm
b = 96
d = 8.0
e = 0.730
t, = L /(V *60)
L = Length (ft
V = Velocity (ft/sec)
APPENDIX C
Depth of Flow in Gutter Calculations
100 -year storm
Freeboard I
ft.
I L4'0
I 8£'0
I 84'0
1 E9'0
I 64 0
1 44 0
I 0£'0
I 6 Z' 0
1 Z£'
1 o£o
I £90
1 4Z0 I
' 11 8 13
MOLT
I £0'LBZ
£0'L8Z
CO' L8Z
CO' LBZ
19£'
282.35 J
19£'ZBZ
9£ZSZ
9Z L9Z
9Z 19Z I
9Z'L9Z
9Z 1.8Z
Gutter
Runoff, Elev.
280.62 I
280.65 I
1
09'09Z
99'09Z
r 99 L9
L61BZ
90Z9Z
90Z8Z
46'09Z
96'093
CL 08Z
ZO'L93
ld
Jeun5
L£'093
280.37
L£'09Z
L£' 093
169' L83
69' L93
69'L83
69' 1.93
280.60
280.60
09'08Z
280.60
Top of
Curb
OL'09Z I
280.70 I
OL'09Z I
OL' 08Z
I ZO'Z8Z I
I Z0 'Z93 I
30393
ZO'Z83 I
£6'093 I
1 280.93
£6'08Z I
1 280.93
N
0
0)
0
0
-J
✓ w
c
▪ W
in O o
tn
to 15. 4
.c d N
CL. o
> a
S N
a
g t
> O
a
.
s 2
. E
0
0
A
m o
L' jp
1
N
rn
N
V
N
O
N
(V
co
0
N
N
co
co
N
0
N
O
0
0)
N
0
0
co
V
0
0
M
Cl
0))
N
O
0)
N
W
((0
N
N
O)
O
o
(V
0
0
0
0
0)
0 sr
co
0
W
O
N
co
O
0
O
O
m
C)
m
0
O
r
O
O
0
0
0
co
0
0
V
C
40
CO
O
C
O
m
C--
CO
sr
O
N
O
m
co
0
0
O
0
m
co
0
CO
O
rn
8
0
O
O
N
O
r
0)
O
co
O
ai
0
0
0 0
O
co
0
O
O
0
N
N
N
m
N
N
O
(0
0)
N-
6
N
n
m
O
N
co
0)
O
0
0
0
0
O V
N
0
0
co
O
Y7
OD
N
M
0)
O
CO
N
C)
O
0)
co
co
0
co
0
0
W
0
0
N
N
O
4-
O
0
N
01
CO
m
0
0
0
co
n
o
co
0
tV
N
O
0-
M
O
co
co
O
r
N
N
O
0
Ci
O
l
O
N
co
0
O
O
0
N
N
CO
O
co
O
N
LO
ui
O
CA
O
C
O
0
0
0
a,
O
0) m
0 0
C)
LO
N
CA
O
C)
O
O
0-
M
co
O
0
co
0
O
0
N
O
O
C)
C
O
N
N
0
0
0 0
0
N
N
m
c
U
N
Laydown Curb - 10-yr storm max design depth - 4"
Castle Rock Subdivision
Solved to find actual de
7' street = 0.0330
506, 505A, 503A
ht Crown Flow
100-year storm
10-year storm
th of flow In
APPENDIX D
Storm Sewer Inlet Design Summary
Castle Rock Subdivision - Phase 5
Storm Sewer Inlets in Sump - Design Analysis
Inlet Length Q10 D10 D10 Q100 D100 D100
No. ft. cfs ft. in. cfs ft. in.
407* 5 4.57 0.486 5.83 6.35 0.605 7.26
408 5 0.98 0.174 2.09 1.33 0.213 2.56
501 5 1.76 0.257 3.09 2.37 0.314 3.77
502 10 9.04 0.482 5.79 12.29 0.592 7.10
503 10 7.49 0.425 5.10 10.17 0.521 6.26
504 10 6.58 0.390 4.68 8.87 0.476 5.71
* Includes bypass flow from upstream inlets on grade
Assume 10% clogging for design
APPENDIX E
Storm Sewer Pipe Design Summary
!Time
(min)
•
Z9'0
I 9Z'0
OL'0
I 14'0
I 0 1'0
I 140
I 91'0
1 900
1 CVO
1 Lz
1 410
I 900 I
L£
9l
op
ISM
I Sz
co
ZL I
op
c•P
V
(fps)
I 6'L
I 0'9
I 0 '9
I 0' 9
I 0
0'OL
I (OL 1
1 £ OL 1
L8
L9
L9
8'9
(no)
OLo
90'99
16'4
84'6
00'91
00'£1
90'94
49 Z4 1
1 91'64
49'99
L VE9 I
Z6'Z9
L8'44
taus!)
0LI
I 691'9
I 9E9'9
I 9E9'9
I 9£9'8
I 9E9'9
I 559'5
I 009'9
I 0959
£L9'9
999'4 I
OE9'9
£L9'9
(uPu)
3 .1.
1 OL'Ez
01:10
0'0 L
I oo'ot
1 00'01
I UTZ
I £L'4Z
I 6Z•4Z
4E'4Z
L4'4Z
89'42
L9'4Z I
0
1 09'0
1 09'0
1 09'0
1 09'0
I 09'0
I 09'0
I 0 9 ' 0
09'0
090
090
09'0
09'0
Contributing Pipes
8 - Zd
I 8 'L
Existing P2 -6, Existing P2 -7, I
Existing P -8
P503, P504, P2 -6, P2 -7, P2 -8
P505, P503, P504, P2 -6, P2 -7, P2-
8
IP506, P505, P503, P504, P2 -6, P2
7, P2 -8
I P507, P506, P505, P503, P504,
P2 -6, P2 -7, P2 -8
P508, P507, P506, P505, P503,
P504, P2 -6, P2 -7, P2 -8
I P609, P508, P507, P506, P505,
P503, P504, P2-6, P2 -7, P2-8
1 P610, P609, P508, P507, P506,
P505, P503, P504, P2 -6, P2 -7, P2
8
Contributing
Area
(Acres)
I 08L'OL
I 096'0
I 0£8' L
I OLSZ
I OLSZ
I 069'ZL
I 069'ZL
099'41
096'9L
096'91
096'91 I
068'91
Contributing
Drainage Areas
Future Phases
ZO9
503, 502A, 502
505, 504, 503, 502A, 502
505, 504, 503, 502A, 502
Future Phases, 505, 504, 503,
502A, 502
Future Phases, 505, 504, 503,
502A, 502
507, 506, 505A, 503A, Future
Phases, 505, 504, 503, 502A,
502
I 501, 601, 507, 506, 505A,
503A, Future Phases, 505,
504, 503, 502A, 502
I 501, 601, 507, 506, 505A,
503A, Future Phases, 505,
504, 503, 502A, 502
I 501, 601, 507, 506, 505A,
503A, Future Phases, 505,
504, 503, 502A, 502
602, 501, 601, 507, 506,
505A, 503A, Future Phases,
505, 504, 503, 502A, 502
a. N
0 0 e l '
09,0
I L9'0
I 04'0
1 04'
I 09'0
1 00'1
100 1
00'l
09'0 1
09'0 I
09'0 I
09'0 I
L
0
-J
06'L6Z
0£'61
00'19
100'4Z L
109'8Z
1 06'94Z
1 09'£6
1 00'19
1 0449 1
09'101 I
OL'OL I
00'9Z I
0 N C
G.
a'vo '--
I 9E
I 4Z
I 4Z
1 9£
I 9£
9£
Z4
Z4
Z4 1
Z4 I
a s z °
OD
a
r-
a
f0
a
1 409
1 909
1 909
1 L09
809
609
OL9 I
149 I
Storm Sewer Pipe Summary (10-yr Storm)
Castle Rock-Phase 5
31 Time
I (min)
I L6'0
1 9Z0 1
I 01.'0
I 1.4'0
I 01.'0
I £8'0
I 9E 0
I L 1.'0
I 91 0
I 90'0
ZZ'0
80'0
1 as 1
91. 1
to
9Z
m
09
CZ
n
1.1.
ZZ
1 E1
a
(sd;)
A
00'S
00'9
00'S
00'9
00'9
009
01.'4
09'4
00'9
00'S
04'9
OZ'S
(sly)
001.0
1 69'14
OL9
8C71.
£51.1.
09'11
09'89
S0'99
Z6'99
Z9'ZL
L4'ZL
L0'ZL 1
01'91
(i4/ui)
0011
1 8081
6£9'1.1
6E9'1.1.
609'14
6E9'1.1.
L69'L
909 L
L69'L
689'1
999'1
LESL
6091
(uiw)
of
1 oyez
00'01.
00'01
00'01.
00'01
ZL'£Z
£1.
6Z'4Z
4E'4Z
L4'4Z
99'4Z
1.9
0
090
09'0
09'0
09'0
09'0
09'0
09'0
09'0
09'0
09'0
09'0
09'0
Contributing Pipes
9 - Zd
P2 -7, P2 -8
Existing P2-6, Existing P2 -7,
Existing P -8
P503, P504, P2 -6, P2 -7, P2 -8
P505, P503, P504, P2 -6, P2 -7, P21
8
P506, P505, P503, P504, P2 -6, P2
7, P2 -8
P507, P506, P505, P503, P504,
P2 -6, P2 -7, P2 -8
P508, P507, P506, P505, P503,
P504, P2 -6, P2 -7, P2 -8
P609, P508, P507, P506, P505,
P503, P504, P2 -6, P2 -7, P2 -8
P610, P609, P508, P507, P506,
P505, P503, P504, P2 -6, P2 -7, P2
Contributing
Area
(Acres)
10.180
096'0
OE8'1.
01,52
1 01.52
I 069'21
069 Z1.
099'41. -1
046'41.
0S6'91.
OS6'91.
069'91.
Contributing
Drainage Areas
Future Phases
ZOS
503, 502A, 502
I Z0S 'VZO9 '009 '409 'SOS
505, 504, 503, 502A, 502
Future Phases, 505, 504, 503,
502A, 502
Future Phases, 505, 504, 503,
502A, 502
507, 506, 505A, 503A, Future
Phases, 505, 504, 503, 502A,
5n2
501, 601, 507, 506, 505A,
503A, Future Phases, 505,
504 5n3 502A 5n2 .___.
501, 601, 507, 506, 505A,
503A, Future Phases, 505,
504 5n3 502A 51
501, 601, 507, 506, 505A,
503A, Future Phases, 505,
602, 501, 601, 507, 506,
505A, 503A, Future Phases,
o
6
O V
N
0901
190 1
1 040 1
1 040 1
0901
001 1
°°1. I
° °t
050 1
1
0
t
c r
J
1.06' 1.62 1
00'61 1
0010 1
00'421. 1
o9 9Z 1
06'84Z
09'06
00 LE 1
01.'49 1
107.60 I
01'01
S. P, v
!L N
9E
1 81. 1
4Z 1
4Z I
4Z 1
9C 1
1 9E 1
I Z4
1 Z4 1
1 Z4 1
1 Z4 1
a Z
E
COS
8
L
9 - Zd
409
909
909
LOS
909
609
1 01.9
0
co
0 °.
0) CO
11 11 11
d V N
CO
0 In n
m co 0
11 11 11
.0 0 d
Storm Sewer Pipe Summary (100-yr Storm)
Note: 100-Yr TCs set to same values as 10-Yr TCs.
The Rational Method:
Brazos County:
100 year storm
10year storm
e g!!«
0� l;«
m
m
m
m
E)
e g!!«
0� l;«
m
QZ
e g!!«
0� l;«
VIM
)/
k
00
��
kk
CISM
)/
k
00
��
kk
CISM
EXHIBIT A
Drainage Area Map