HomeMy WebLinkAboutDrainage Analaysis 3/15/2010J
DRAINAGE ANALYSIS
for
Valley Park Center
11.635 Total Acres
Lots 1 -4
Prepared by:
JONES &CARTE R, INC.
ENGINEERS• PLANNERS• SURVEYORS
700 University Dr. East, Suite 110 -C
College Station, Texas 77840 -1848
THIS DOCUMENT IS RELEASED
FOR THE PURPOSE OF:
REVIEW #2
03/15/2010
UNDER THE AUTHORITY OF
STEVE E. DUNCAN, P.E. 83252.
IT IS NOT TO BE USED FOR
CONSTRUCTION, BIDDING, OR
PERMITTING PURPOSES.
H Reach
Inlet 7 "" 1 Inlet 5
Inlet 10
Inlet9
Summary Results for Reservoir "Detention Pond
Project: Valley Park
Simulation Run: Philip Post 2 Reservoir: Detention Pond
Start of Run: 093u12009, 12:00
End of Run: 103u12009, 12 :30
Compute Time: 10Mar2010, 15:14:48
Computed Results
Peak Inflow : 38.8 (CFS)
Peak Outflow : 8.8 (CFS)
Total Inflow : 3.69 (IN)
Total Outflow 3.69 (IN)
Start of Run: 093u12009, 12 :00
End of Run: 103u12009, 12:30
Compute Time: 10Mar2010, 15:14:34
Computed Results
Peak Inflow : 68.3 (CFS)
Peak Outflow : 19.2 (CF5)
Total Inflow : 6.66 (IN)
Total Outflow : 6,67 (IN)
Vokime Units: Q IN 0 AC -FT
Volume Units: 0 IN 0 AC -FT
Inlet Pond
Basin Model: Philip Post
Meteorologic Model: Philip 24hr - 2 yr
Control Specifications: Control 1
Date /Time of Peak Inflow : 103u12009, 00:05
Date /Time of Peak Outflow : 103u12009, 00:35
Peak Storage . 1.1 (AC -FT)
Peak Elevation : 326.6 (FT)
S y Results for Reservoir Detention Pond
Project: Valley Park
Simulation Run: Philip Post 10 Reservoir: Detention Pond
Basin Model: Philip Post
Meteorologic Model: Philip 24hr - 10 yr
Control Specifications: Control 1
DateiTime of Peak Inflow : 10Jul2009, 00:05
Date /Time of Peak Outflow : 10Jut2009, 00:30
Peak Storage : 2.0 (AC -FT)
Peak Elevation : 329.2 (FT)
01
Inlet 3 Inlet 1
wro
Pond Junction
LOW
Detention Pond
Summary Results for Reservoir "Detention Pond"
Project: Valley Park
Simulation Run: Philip Post 25 Reservoir: Detention Pond
Start of Run: 091u12009, 12:00 Basin Model: Philip Post
End of Run: 103u12009, 12:30 Meteorologic Model: Philip 24hr 25 yr
Compute Time: 10Mar2010, 15 :14:00 Control Specifications: Control 1
Volume Units: 0 IN 0 AC -FT
Computed Results
Peak Inflow : 81.9 (CFS)
Peak Outflow : 22.1 (CFS)
Total Inflow : 8.05 (IN)
Total Outflow : 8.05 (IN)
x r � r
u1rMYta
Start of Run: 09JuI2009, 12:00
End of Run: 103u12009, 12:30
Compute Time: 10Mar2010, 15:07 :33
Computed Results
Peak Inflow : 106.1 (CFS)
Peak Outflow : 94.7 (CFS)
Total Inflow : 10.55 (IN)
Total Outflow : 10.54 (IN)
DatejTime of Peak Inflow : 10Jul2009, 00:05
Date /Time of Peak Outflow : 10Ju12009, 00:30
Peak Storage : 2.5 (AC -FT)
Peak Elevation : 330.4 (FT)
` Summary Results for Reservoir "Detention Pond"
s u s or ' eservoir: "Detention Pond"
Project: Valley Park
Simulation Run: Philip Post 100 Reservoir: Detention Pond
Volume Units: (;) IN c; AC -FT
t. LI
Project: Valley Park
Simulation Run: Philip Post 100 Reservoir: Detention Pond
Start of Run: 093u12009, 12 :00
End of Run: 101,12009, 12:30
Compute Time: 10Mar2010, 15:14:19
Computed Results
Peak Inflow : 106.1 (CFS)
Peak Outflow : 30.9 (CFS)
Total Inflow : 10.55 (IN)
Total Outflow : 10.54 (IN)
Volume Units: O IN 0 AC -FT
Basin Model: Phsp Post
Meteorologic Model: Philip 24hr 100 yr
Control Specifications: Control 1
Date /Time of Peak Inflow : 10Ju12009, 00:05
Date /Time of Peak Outflow : 103u12009, 00 :30
Peak storage : 3.3 (AC -FT)
Peak Elevation . 332.5 (FT)
Basin Model: Philip Post
Meteorologic Model: Philip 24hr 100 yr
Control Specifications: Control 1
Date /Time of Peak Inflow : 103u12009.. 00:05
Date /Time of Peak Outflow : 10Jul2009, 00:10
Peak Storage : 4.0 (AC -FT)
Peak Elevation : 334.0 (FT)
35
30
25
20
15
10
5
0
NRCS Postdevelopment Runoff
25 10
NRCS Predevelopment
25 -yr
Runoff
10
2 -yr runoff
35.0
2 Year
i
25 Year
100 -yr runoff
• Pre
runoff
-yr runoff
25.6
40.0
•
cc
Q 0.0
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35.0
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25 10
2 -yr runoff
100 -yr runoff -yr runoff
-yr runoff
35.0
2 Year
10 Year
25 Year
100 Year
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25.6
35.4
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10 Year
25 Year
100 Year
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2 Year
10 Year
25 Year
100 Year
Pre (cfs) Post (cfs)
8.8
20.1
25.6
35.4
8.8
19.2
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30.9
Water Surface
2 Year
10 Year
25 Year
100 Year
Clogged
Post
326.6
329.2
330.4
332.5
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Pipe Characteristics
Reach:
ft
ft
n
3ydr.'
tadin
ft
done .. Ve
ft/ft
ft/s
min
min
A
1
480 0.02 0.25 0.006 2.290 3.493 2.096
B 4.5 388.522 0.02 1.125 0.006 6.242 1.037 0.622
C 4 214.514 0.02 1 0.006 5.771 0.620 0.372
D 4 269.7145 0.02 1 0.006 5.771 0.779 0.467
E 3 234.5525 0.02 0.75 0.006 4.764 0.821 0.492
F 2 234.0686 0.02 0.5 0.006 3.635 1.073 0.644
G 2 58.66 0.02 0.5 0.006 3.635 0.269 0.161
H 2 479.5789 0.02 0.5 0.006 3.635 2.199 1.319
F: \VALLEY PARK 2\2010 -01 -27 Preliminary Drainage Report- VPILdoe
APPENDIX II
Page 5
■
IRK CENTER PHASE 2
aL1 11,635 ACRES
DEVELOPMENT
GE AREA MAP
IES &CA FIT' E R,iuc.
EERS•PLANNER$.SURVEYORS
sional Engineers Registration No. F-439
160, Bryan, Texas 77802 (979) 731 -8000
THIS DOCUNENr s RELEASED
FOR THE PURPOSE OF.
SITE PLAN REVIEW #2
03/15/2010
UNDER ME AUTHORITY of
WYE E. DUNCAN, PL I 2.
CALCULATED FLOW
Fire Flow at hydrant 0 -120:
With 20 -psi pressure at Static Hydrant 0 -107:
Q = 29.83c P
Q = (29 .83)(0.9)(2.5) 45 = 1,126 gpm
— 20 0.54
Qf = Q r (
Ps s — r
0 o
Q = (1126) 80 - 21 = 4,860 gpm
80 — 76
Where:
Q = residual flow at the pitot pressure (gpm)
Q = Fire Flow (gpm)
c = friction loss (usually 0.9 for smooth 2.5 -in opening)
D = diameter of opening in inches (2.5 in most cases)
P = pitot pressure (psig)
P = residual pressure (psig)
P = static pressure (psig)
REQUIRED FLOW
Building Type = IIB (Section 602 and 1505 of 2006 International Building Code)
Fire Area = 25,000 square feet (Section B104 of 2006 International Fire Code)
Required Fire Flow = 1,750 gpm (Table B105.1 of 2006 International Fire Code)
50% reduction allowed for sprinkler system = 875 gpm (Section B105.2 of 2000 International
Fire Code {75 %} /Fire Marshall {50 % })
Number of hydrants required = 1 (Table C105.1 of 2000 International Fire Code)
RESULTS
4,860 gpm available > 875 gpm required = OK
2 hydrants available = 1 hydrants required = OK
VALLEY PARK CENTER PHASE II
CITY OF COLLEGE STATION
JC JOB #C0009- 011 -00
FIRE FLOW CALCULATION
t
r ... of T Ex�S,'.l.
FIRE -FLOW CALCULATION AREA (square feet)
FIRE -FLOW
(gallons per minute)`
FLOW DURATION
(hours)
Type IA and IB
Type IIA and IllA
Type IV and V -A
Type IIB and IIIB
Type V -B
0- 22,700
0- 12,700
0- 8,200
0 -5,900
0 -3,600
1,500
2
22,701 - 30,200
12,701- 17,000
8,201 - 10,900
5,901 -7,900
3,601 -4,800
1,750
30,201- 38,700
17,001- 21,800
10,901- 12,900
7,901 -9,800
4,801 -6,200
2,000
38,701- 48,300
21,801- 24,200
12,901- 17,400
9,801 - 12,600
6,201 -7,700
2,250
48,301 - 59,000
24,201- 33,200
17,401- 21,300
12,601 - 15,400
7,701 -9,400
2,500
59,001- 70,900
33,201- 39,700
21,301- 25,500
15,401- 18,400
9,401- 11,300
2,750
70,901 - 83,700
39,701- 47,100
25,501- 30,100
18,401 - 21,800
11,301- 13,400
3,000
3
83,701- 97,700
47,101 - 54,900
30,101- 35,200
21,801- 25,900
13,401 - 15,600
3,250
97,701- 112,700
54,901- 63,400
35,201- 40,600
25,901- 29,300
15,601- 18,000
3,500
112,701 - 128,700
63,401- 72,400
40,601 - 46,400
29,301 - 33,500
18,001- 20,600
3,750
128,701- 145,900
72,401 - 82,100
46,401 - 52,500
33,501- 37,900
20,601- 23,300
4,000
4
145,901- 164,200
82,101- 92,400
52,501 - 59,100
37,901- 42,700
23,301 - 26,300
4,250
164,201- 183,400
92,401 - 103,100
59,101- 66,000
42,701- 47,700
26,301- 29,300
4,500
183,401- 203,700
103,101- 114,600
66,001 - 73,300
47,701 - 53,000
29,301- 32,600
4,750
203,701- 225,200
114,601- 126,700
73,301- 81,100
53,001 - 58,600
32,601- 36,000
5,000
225,201- 247,700
126,701- 139,400
81,101- 89,200
58,601- 65,400
36,001- 39,600
5,250
247,701- 271,200
139,401- 152,600
89,201- 97,700
65,401- 70,600
39,601- 43,400
5,500
271,201- 295,900
152,601- 166,500
97,701- 106,500
70,601 - 77,000
43,401- 47,400
5,750
295,901- Greater
166,501- Greater
106,501 - 115,800
77,001- 83,700
47,401 - 51,500
6,000
-
-
115,801 - 125,500
83,701 - 90,600
51,501 - 55,700
6,250
-
-
125,501- 135,500
90,601- 97,900
55,701- 60,200
6,500
-
-
135,501 - 145,800
97,901- 106,800
60,201- 64,800
6,750
-
-
145,801 - 156,700
106,801- 113,200
64,801- 69,600
7,000
-
-
156,701- 167,900
113,201- 121,300
69,601- 74,600
7,250
-
-
167,901- 179,400
121,301 - 129,600
74,601- 79,800
7,500
-
-
179,401 - 191,400
129,601 - 138,300
79,801- 85,100
7,750
-
-
191,401- Greater
138,301- Greater
85,101- Greater
8,000
APPENDIX B
For S1: 1 square foot = 0.0929 m 1 gallon per minute = 3.785 LJm, 1 pound per square inch = 6.895kPa.
a. The minimum required fire flow shall be allowed to be reduced by 25 percent for Group R.
b. Types of construction are based on the International Building Code.
c. Measured at 20 psi.
394
TABLE B105.1
MINIMUM REQUIRED FIRE -FLOW AND FLOW DURATION FOR BUILDINGS'
2006 INTERNATIONAL FIRE CODE®
FIRE -FLOW REQUIREMENT
(gpm)
MINIMUM NUMBER
OF HYDRANTS
AVERAGE SPACING
BETWEEN HYDRANTS °' `
(feet)
MAXIMUM DISTANCE FROM
ANY POINT ON STREET OR ROAD
FRONTAGE TO A HYDRANT'
1,750 or less
1
500
250
2,000 -2,250
2
450
225
2,500
3
450
225
3,000
3
400
225
3,500 -4,000
4
350
210
4,500 -5,000
5
300
180
5,500
6
300
180
6,000
6
250
150
6,500 -7,000
7
250
150
7,500 or more
8 or more`
200
120
FIRE HYDRANT LOCATIONS AND DISTRIBUTION
The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.
SECTION C101
GENERAL
C101.1 Scope. Fire hydrants shall be provided in accordance
with this appendix for the protection of buildings, or portions
of buildings, hereafter constructed.
SECTION C102
LOCATION
C102.1 Fire hydrant locations. Fire hydrants shall be pro-
vided along required fire apparatus access roads and adjacent
public streets.
SECTION C103
NUMBER OF FIRE HYDRANTS
C103.1 Fire hydrants available. The minimum number of fire
hydrants available to a building shall not be less than that listed
in Table C105.1. The number of fire hydrants available to a
complex or subdivision shall not be less than that determined
by spacing requirements listed in Table C105.1 when applied
to fire apparatus access roads and perimeter public streets from
which fire operations could be conducted.
2006 INTERNATIONAL FIRE CODE
APPENDIX C
TABLE C105.1
NUMBER AND DISTRIBUTION OF FIRE HYDRANTS
SECTION C104
CONSIDERATION OF EXISTING FIRE HYDRANTS
C104.1 Existing fire hydrants. Existing fire hydrants on pub-
lic streets are allowed to be considered as available. Existing
fire hydrants on adjacent properties shall not be considered
available unless fire apparatus access roads extend between
properties and easements are established to prevent obstruction
of such roads.
SECTION C105
DISTRIBUTION OF FIRE HYDRANTS
C105.1 Hydrant spacing. The average spacing between fire
hydrants shall not exceed that listed in Table C105.1.
Exception: The fire chief is authorized to accept a defi-
ciency of up to 10 percent where existing fire hydrants pro-
vide all or a portion of the required fire hydrant service.
Regardless of the average spacing, fire hydrants shall be
located such that all points on streets and access roads adjacent
to a building are within the distances listed in Table C105.1.
For SI: 1 foot = 304.8 mm, 1 gallon per minute = 3.785 Um.
a. Reduce by 100 feet for dead -end streets or roads.
b. Where streets are provided with median dividers which can be crossed by fire fighters pulling hose lines, or where arterial streets are provided with four or more
traffic lanes and have a traffic count of more than 30,000 vehicles per day, hydrant spacing shall average 500 feet on each side of the street and be arranged on an
alternating basis up to a fire -flow requirement of 7,000 gallons per minute and 400 feet for higher fire -flow requirements.
c. Where new water mains are extended along streets where hydrants are not needed for protection of structures or similar fire problems, fire hydrants shall be pro-
vided at spacing not to exceed 1,000 feet to provide for transportation hazards.
d. Reduce by 50 feet for dead -end streets or roads.
e. One hydrant for each 1,000 gallons per minute or fraction thereof.
395
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
The Cities of Bryan and College Station both require storm drainage design to follow these
Unified Stormwater Design Guidelines. Paragraph C2 of Section III (Administration) requires
submittal of a drainage report in support of the drainage plan (stormwater management plan)
proposed in connection with land development projects, both site projects and subdivisions.
That report may be submitted as a traditional prose report, complete with applicable maps,
graphs, tables and drawings, or it may take the form of a "Technical Design Summary". The
format and content for such a summary report shall be in substantial conformance with the
description in this Appendix to those Guidelines. In either format the report must answer the
questions (affirmative or negative) and provide, at minimum, the information prescribed in the
"Technical Design Summary" in this Appendix.
The Stormwater Management Technical Design Summary Report shall include several parts
as listed below. The information called for in each part must be provided as applicable. In
addition to the requirements for the Executive Summary, this Appendix includes several
pages detailing the requirements for a Technical Design Summary Report as forms to be
completed. These are provided so that they may be copied and completed or scanned and
digitized. In addition, electronic versions of the report forms may be obtained from the City.
Requirements for the means (medium) of submittal are the same as for a conventional report
as detailed in Section III of these Guidelines.
Note: Part 1 — Executive Summary must accompany any drainage report
required to be provided in connection with any land development project,
regardless of the format chosen for said report.
Note: Parts 2 through 6 are to be provided via the forms provided in this
Appendix. Brief statements should be included in the forms as requested,
but additional information should be attached as necessary.
Part 1 — Executive Summary Report
Part 2 — Project Administration
Part 3 — Project Characteristics
Part 4 — Drainage Concept and Design Parameters
Part 5 — Plans and Specifications
Part 6 — Conclusions and Attestation
STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT
Part 1 — Executive Summary
This is to be a brief prose report that must address each of the seven areas listed below.
Ideally it will include one or more paragraphs about each item.
1. Name, address, and contact information of the engineer submitting the report, and
of the land owner and developer (or applicant if not the owner or developer). The
date of submittal should also be included.
2. Identification of the size and general nature of the proposed project, including any
proposed project phases. This paragraph should also include reference to
applications that are in process with either City: plat(s), site plans, zoning requests,
STORMWATER DESIGN GUIDELINES Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
or clearing /grading permits, as well as reference to any application numbers or
codes assigned by the City to such request.
3. The location of the project should be described. This should identify the Named
Regulatory Watershed(s) in which it is located, how the entire project area is
situated therein, whether the property straddles a watershed or basin divide, the
approximate acreage in each basin, and whether its position in the Watershed
dictates use of detention design. The approximate proportion of the property in the
city limits and within the ETJ is to be identified, including whether the property
straddles city jurisdictional lines. If any portion of the property is in floodplains as
described in Flood Insurance Rate Maps published by FEMA that should be
disclosed.
4. The hydrologic characteristics of the property are to be described in broad terms:
existing land cover; how and where stormwater drains to and from neighboring
properties; ponds or wetland areas that tend to detain or store stormwater; existing
creeks, channels, and swales crossing or serving the property; all existing drainage
easements (or ROW) on the property, or on neighboring properties if they service
runoff to or from the property.
5. The general plan for managing stormwater in the entire project area must be
outlined to include the approximate size, and extent of use, of any of the following
features: storm drains coupled with streets; detention / retention facilities; buried
conveyance conduit independent of streets; swales or channels; bridges or culverts;
outfalls to principal watercourses or their tributaries; and treatment(s) of existing
watercourses. Also, any plans for reclaiming land within floodplain areas must be
outlined.
6. Coordination and permitting of stormwater matters must be addressed. This is to
include any specialized coordination that has occurred or is planned with other
entities (local, state, or federal). This may include agencies such as Brazos County
government, the Brazos River Authority, the Texas A &M University System, the
Texas Department of Transportation, the Texas Commission for Environmental
Quality, the US Army Corps of Engineers, the US Environmental Protection Agency,
et al. Mention must be made of any permits, agreements, or understandings that
pertain to the project.
7. Reference is to be made to the full drainage report (or the Technical Design
Summary Report) which the executive summary represents. The principal
elements of the main report (and its length), including any maps, drawings or
construction documents, should be itemized. An example statement might be:
"One -page drainage report dated , one set of
construction drawings ( sheets) dated , and a
-page specifications document dated comprise
the drainage report for this project."
STORMWATER DESIGN GUIDELINES Page 2 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
Part 2 — Project Administration
Start (Page 2.1)
Engineering and Design Professionals Information
Engineering Firm Name and Address:
Jones & Carter, Inc.
1716 Briarcrest Drive, Suite 160
Bryan, Texas 77802
Jurisdiction
City: Bryan
X College Station
Date of Submittal:
Lead Engineer's Name and Contact Info.(phone, e-mail, fax):
Steve E. Duncan, P.E. (979) 731 -8000
SDuncan@jonescarter.com Fax: (979) 846 -2893
Other:
Supporting Engineering / Consulting Firm(s):
Derek Walton
Jones & Carter, Inc.
DWalton@jonescarter.com
Other contacts:
Developer / Owner / Applicant information
Developer / Applicant Name and Address:
Titan Valley Park, Limited Partnership
C/O Southcorp Realty Advisors, Inc.
3401 Allen Parkway, Suite 200, Houston, Texas 77019
Phone and e-mail:
713- 960 -1880
DHillman@southcorprealty.com
Property Owner(s) if not Developer / Applicant (& address):
Phone and e-mail:
Project identification
Development Name: Valley Park Center 2
Is subject property a site project, a single -phase subdivision, or part of a multi -phase subdivision?
Valley Park Center If multi - phase, subject property is phase 2 of 3 .
Legal description of subject property (phase) or Project Area:
(see Section II, Paragraph B -3a)
Valley Park Center, Lot 2
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.
Phase I: Completely Developed
General Location of Protect Area, or subject property (phase):
Northwest Corner of Highway 60 and FM 2818
In City Limits?
Bryan: acres.
Extraterritorial Jurisdiction (acreage):
Bryan: College Station:
Acreage Outside ETJ:
College Station: 11.635 acres.
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 2 — Project Administration
Continued (page 2.2)
Project Identification (continued)
Roadways abutting or within Project Area or
subject property:
Hwy 60
FM 2818
Abutting tracts, platted land, or built
developments:
City Cemetary (West)
Named Regulatory Watercourse(s) & Watershed(s):
Tributary Basin(s):
Plat Information For Project or Subject Property (or Phase)
Preliminary Plat File #:
Final Plat File #: In Progress Date:
Status and VoI /Pg:
Name:
If two plats, second name: File #:
Status: N/A Date:
Zoning Information For Project or Subject Property (or Phase)
Zoning Type: CI (Phase II) Existing or Proposed? Exisiting Case Code:
Case Date Status:
Zoning Type: Existing or Proposed? Case Code:
Case Date Status:
Stormwater Management Planning For Project or Subject Property (or Phase)
Planning Conference(s) & Date(s):
N/A
Participants:
N/A
Preliminary Report Required? Yes Submittal Date 1/27/2010 Review Date
Review Comments Addressed? Yes 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/A
SECTION IX
STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
APPENDIX D - TECHNICAL DESIGN SUMMARY
Effective February 2007
Part 2 — Protect 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/A
Coordination With
Non jurisdiction
City Needed?
Yes No X
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
Brazos County
Needed?
Yes No X
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
TxDOT Needed?
Yes X No
Summarize need(s) & actions taken (include contacts & dates):
Storm Permit Approved
Coordination with
TAMUS Needed?
Yes No X
Summarize need(s) & actions taken (include contacts & dates):
Permits For Project 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
Approved ?
Status of Actions (include dates)
US Army Crops of
Engineers
No X Yes
US Environmental
Protection Agency
No X Yes
Texas Commission on
Environmental Quality
No X Yes
Brazos River
Authority
No X Yes
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
Existin ! : Land proposed for development currently used, including extent of impervious cover?
11.635 Acres Total. Phase I = 4.655 Acres / II = 2.240 / III = 3.740 / Pond = 1.00
Site
Development
Project
(select all
applicable)
Redevelopment of one platted lot, or two or more adjoining platted Tots.
X Building on a single platted lot of undeveloped land.
X 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 • 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.
Phase I = 5400 SF 88.40
Phase II = 2500 SF 83.40
Phase III = 4500 SF 76.60
Project
Is any work planned on land that is not platted
If yes, explain:
Land is platted, but we will be filing a replat
or on land for which platting is not pending?
No X Yes
FEMA Floodplains
Is any part of subject property abutting a Named Regulatory Watercourse
(Section II, Paragraph B1) or a tributary thereof?
No X Yes
Is any part of subject property in floodplain
area of a FEMA - regulated watercourse?
No X Yes Rate Map
Encroachment(s)
into Floodplain
areas planned?
No X
Encroachment purpose(s): Building site(s) Road crossing(s)
Utility crossing(s) Other (explain):
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
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
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 study (& date) here, and attach copy if not already in City files.
Is the stormwater
earlier study?
management plan for the property in substantial
Yes No If not, explain how
conformance with the
it differs.
No
X
If subject property
plan for the property
Is not part of multi -phase project, describe
stormwater management
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.
The design subject to approval, will ultimately control the release rate for
Valley Park Center at foil development.
Do existing topographic features on subject property store or detain
Describe them (include approximate size, volume, outfall, model, etc).
Temp. pond built on lot 3.
runoff? No X Yes
Any known drainage or flooding problems in areas near subject property?
Identify:
x No Yes
Based
(see Table
X
on location of
B -1 in Appendix
Detention is required.
study property in a watershed, is Type 1 Detention (flood control) needed?
B)
Need must be evaluated. Detention 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 Phase) (continued)
Does subject property straddle a Watershed or Basin divide?
describe splits below. In Part 4 describe design concept
X No Yes If yes,
for handling this.
Watershed or Basin
Larger acreage
Lesser acreage
Above - Protect Areas(Section II, Paragraph B3 -a)
Does Project Area (project or phase) receive runoff from upland areas?
Size(s) of area(s) in acres: 1) 2) 3)
X No Yes
4)
Flow Characteristics (each instance) (overland sheet, shallow
concentrated, recognizable
Watercourse or tributary);
concentrated section(s), small creek (non - regulatory), regulatory
Flow determination: Outline hydrologic methods and assumptions:
Does storm runoff drain from public easements or ROW
No Yes If yes, describe facilities in easement
onto or across subject property?
or ROW:
Are changes in runoff characteristics subject to change in future? Explain
Conveyance Pathways (Section II, Paragraph C2)
Must runoff from study property drain across lower properties before reaching a Regulatory
Watercourse or tributary? X No Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies).
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
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
pathway(s)?
No
any
If yes, for what part of length? % Created by? plat, or
instrument. If instrument(s), describe their
provisions.
Yes
Pathway
Areas
Where runoff must cross lower properties, describe characteristics of abutting lower
property(ies). (Existing watercourses? Easement or Consent aquired ?)
N/A
Nearby
Drainage
Facilities
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, Tined channels, buried conduit, swales, detention ponds, etc).
TxDOT Facility
Do any of
design?
TxDOT
these have hydrologic or hydraulic influence on
No X Yes If yes, explain:
proposed stormwater
has granted approval
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
Dlscharge(s) From Upland Area(s)
If runoff is to be received from upland areas, what design drainage features will be used to
accommodate it and insure it is not blocked by future development? Describe for each area,
flow section, or discharge point.
N/A
Dlscharge(s) To Lower Property(Ies) (Section II, Paragraph El)
Does project include drainage features (existing or future) proposed to become public via
platting? X No Yes Separate Instrument? No Yes
Per Guidelines reference above, how will
runoff be discharged to neighboring
property(ies)?
Establishing
Easements (Scenario 1)
Release (Scenario 2)
of the two Scenarios
X Pre - development
Combination
Scenario 1: If easements are proposed, describe
where needed, and provide status of actions
on each. (Attached Exhibit # )
Scenario 2: Provide general description of how
release(s) will be managed
etc.). (Attached
to pre - development
Exhibit # )
conditions (detention, sheet flow, partially concentrated,
Detention
Combination: If combination is proposed, explain
how discharge will differ from pre -
each area (or point) of release.
development conditions at the property line for
If Scenario 2, or Combination are to be used,
has proposed design
No X Yes Explain
been coordinated with
and provide
owner(s) of receiving property(ies)?
documentation.
TxDOT has approved permit.
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 Protect Area Of Multi -Phase Protect
Will project result
in shifting runoff
between Basins or
between
Watersheds?
X 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. X Establishing features to serve overall Project Area.
3. On phase (or site) project basis within Project Area.
1. Shared facility (type & locaton of facility; design drainage area served; relationship to size of
Project Area): (Attached Exhibit # )
N/A
2. For Overall Project Area (type & location of facilities): (Attached Exhibit # )
Detention Pond. Southeast corner of Property
1.00 Acres / 11.635 Total Acres.
3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in
subsequent questions of this Part.
Are aquatic echosystems proposed? X No Yes In which phase(s) or
project(s)?
Are other Best Management Practices for reducing stormwater pollutants proposed?
X No Yes Summarize type of BMP and extent of use:
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 Outfalls
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)
Stormwater Management Concept (continued)
Within Protect Area Of Mufti -Phase Protect (continued)
Will Project Area include bridge(s) or culvert(s)? X 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 project (physical location, conveyance pathway(s), construction sequence):
HDPE Short Conduit
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? X Yes No, then summarize the difference(s):
Design in progress for overall post developed site.
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?
No Yes If yes explain:
Are streets with cL
and gutter used'
x No `
Are valley 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)
Are streets with curb and gutter used?
(continued)
Gutter line slopes: Least Usual Greatest
Are inlets recessed on arterial and collector streets? Yes No If "no ",
identify where and why.
Will inlets capture 10 -year design stormflow to prevent flooding of intersections (arterial
with arterial or collector)? Yes No If no, explain where and why not.
Will inlet size and placement prevent exceeding allowable water spread for 10 -year
design storm throughout site (or phase)? Yes No If no, explain.
Saci curves: Are inlets placed at low points? Yes No Are inlets and
conduit sized to prevent 100 -year stormflow from ponding at greater than 24 inches?
Yes No Explain "no" answers.
Will 100 -yr stormflow be contained in combination of ROW and buried conduit on
whole length of all streets? Yes No If no, describe where and why.
Do designs for curb, gutter, and inlets comply with B -CS Technical Specifications?
Yes No If not, describe difference(s) and attach justification.
Is storm drain system used?
No Yes
Are any 12 -inch laterals used? X No Yes Identify length(s) and where
used.
Pipe runs between system
access points (feet):
Typical Longest
Are junction boxes used at each bend? X Yes No If not, explain where
and why.
Are downstream soffits at or below upstream soffits?
Yes X No If not, explain where and why:
Least amount that hydraulic
grade line is below gutter line
(system- wide):
Not Determined
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
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.5)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Storm drain system (continued)
(on separate sheet provide same info. for more instances)
(s)1191 1n0
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?
Design in Progress
2) Watercourse (or system), velocity, and angle?
See above.
3) Watercourse (or system), velocity, and angle?
See above.
For each outfall above, what measures are taken to prevent erosion or scour of
receiving and all facilities at juncture?
1 ) Pea Gravel Bags.
2)
3)
Are swales used to drain streets?
k No Yes
Are swale(s) situated along property lines between properties? X No Yes
Number 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 -year design storm runoff be contained within easement(s) or platted drainage
ROW in all instances? Yes No If "no" explain:
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
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, or Site) (continued)
Roadside Ditches
Are roadside ditches used? X 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)
i
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)
Will swales without buried conduit receive runoff from
public ROW or easements? 5c 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.
Channel improvements proposed?
X 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 from fringe changes,
are Regulatory
Explain below.
Watercourses proposed to be altered? 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.
Will 100 -year flow be contained with one foot of freeboard? Yes No If
not, identify location and explain:
Are ROW / easements sized to contain channel and required
Yes No If not, identify location(s) and explain:
maintenance space?
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)
Within Or Serving Subject Property (Phase, or Site) (continued)
I
How many facilities for subject property project? 1 For each provide info. below.
For each dry-type facilitiy:
Faci
ity 1
Faci
ity 2
Acres served & design volume + 10%
11.635
12.799
100 -yr volume: free flow & plugged
7.10
7.10
Design discharge (10 yr & 25 yr)
9.1
22.5
Spillway crest at 100 -yr WSE?
Berms 6 inches above plugged WSE?
Explain any "no" answers:
X yes no
yes no
X yes no
yes no
For each facility what is 25 -yr design Q, and design of outlet structure?
Facility 1: 22.5 Box with Orifice
Facility 2:
Do outlets and spillways discharge into a public facility in easement or ROW?
Facility 1: Yes No Facility 2: Yes No
. X
If "no" explain:
For each, what is velocity of 25 -yr design discharge at outlet? & at spillway?
Facility 1: & Facility 2: &
Are energy dissipation measures used? No X Yes Describe type and
location:
At TxDOT Facility Enterance
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
Facility 1: Yes (Temporary)
Facility 2:
For each, what measures are taken to prevent erosion or scour at receiving facility?
Facility 1: RIP RAP
Facility 2:
If berms are used give heights, slopes and surface treatments of sides.
Facility 1: 4:1 Side Slopes / Grass with plants
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)
Stonnwater Management 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; Yes
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?
>e No Yes
Roadside Ditches: Will culverts serve access driveways at roadside ditches?
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)
(for more instances of any type describe location and same information on separate sheet)
Named Regulatory Watercourses (& Tributaries): Are culverts
proposed on these
assumptions,
support proposed
", explain:
facilities? No Yes, then provide full
report documenting
that
If "no
criteria, analysis, computer programs, and study findings
design(s). Is report provided? Yes No
Arterial or Malor Collector Streets: Will culverts
serve these
types of roadways?
For each identify the
No Yes How many instances?
location and provide the information below.
Instance 1:
Instance 2:
Instance 3:
Yes or No for the 100 -year design flow:
1
2
3
Headwater WSE 1 foot below lowest curb top?
Spread of headwater within ROW or easement?
Is velocity limited per conditions (Table C -11)?
Explain any "no" answer(s):
Minor Collector or Local Streets: Will culverts serve
these types
for
of streets?
each identify the
No Yes How many instances?
location 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 Page 20 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 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Culverts (continued)
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 Iocation(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 Iocation(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 in
drainage easements/ ROW? Yes No if not, why
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)
Bridge(s)
Is a bridge included in
If "yes" provide the following
plans for subject property project? 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
Water Quality
Is a Stormwater
Pollution Prevention
Plan (SW3P)
established for
project construction?
No Yes
Provide a general description of planned techniques:
Special Designs — Non - Traditional Methods
Are any non - traditional methods
replication, BMPs for water quality,
X 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?
N/A
special design(s) including rationale
substantiate that stormwater management
cost will not exceed those of
Yes No If "no" explain:
for use and
objectives will not
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
B -CS Technical Specifications, check type facility(ies) and explain by
Detention elements Drain system elements
deviate from provisions of
specific detail element.
Channel features
Inlets Outfalls
Culvert features Swales Ditches
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
Is a map(s) showing all Design Drainage Areas provided? Yes X No
Briefly summarize the range of applications made of the Rational Formula:
What is the size and location of largest
has been applied? acres
Design Drainage Area to which the Rational Formula
Location (or identifier):
SECTION IX
STORMWATER DESIGN GUIDELINES Page 23 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 4.15)
Design Parameters (continued)
Hydrology (continued)
In making determinations for time of concentration, was segment analysis used?
No X Yes In approximately what percent of Design Drainage Areas? %
As to intensity- duration - frequency and rain depth criteria for determining runoff flows, were any
criteria other than those provided in these Guidelines used? X No Yes If "yes"
identify type of data, source(s), and where applied:
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
Storm drain system for local streets
Open channels
Swale /buried conduit combination in lieu of channel
Swales
Roadside ditches and culverts serving them
Detention facilities: spillway crest and its outfall
2, 10, 25, 100
100
Detention facilities: outlet and conveyance structure(s)
2, 10, 25, 100
All
Detention facilities: volume when outlet plugged
Culverts serving private drives or streets
Culverts serving public roadways
Bridges: provide in bridge report.
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) HDPE 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)
For the following, are assumptions other than allowable per Guidelines?
Inlet coefficients? X No Yes Head and friction losses X 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:
X Yes
No
X Yes
No
Are hydraulic grade lines calculated and shown for design storm? Yes X No
For 100 -year flow conditions? Yes X No Explain any
"no" answers:
In Progress
What tailwater conditions were assumed at outfall point(s) of the storm drain system?
each location and explain:
Identify
Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a?
X Yes
No
Outside of straight sections, is flow regime within limits of sub - critical
If "no" list locations and explain:
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?
Entrance, friction and exit losses:
Bridges Provide all in bridge report
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, any applicable patches and the publisher
HEC - HNS 3.3
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:
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 issued or fall under applicable general permits."
(Affix Seal)
Part 8 was prepared
Bryan /College Station
licenses and permits
proposed drainage
Licensed Professional Engineer
State of Texas PE No. 83252
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
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