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FOR
Falcon Point Condos
SITE PLAN
College Station, Texas
MBESI# 1000-0243
r .w
MctmCLURE & BROWNE, ENGINEERING/SURVEYING, INC.
1008 Woodcreek Dr., Suite 103 College Station, Tx. 77845 (979) 693-3838 Engineer Reg. No. F-458
1314 10th Street, Suite 210 Huntsville, Tx. 77320 (936) 294-9749 Survey Reg. No. 101033-00
Falcon Point Condos
Stormwater Management Technical Design Summary Report
MBESI No. 1000-0243
PART 1— Executive Summary Report
Section 1— Contact Information
Project Designer: McClure and Browne Engineering and Surveying, Inc.
1008 Woodcreek Drive, Suite 103
College Station, TX 77845
979-693-3838
Project Developer: Scott Ball
College Station, TX 77845
(979)774-5777
Section 2 — General Information and Project Location
This development is a proposed condominium project involving two buildings and the associated
parking and utility improvements. The development is entirely located within the city limits of College
Station.
The project site is in the Wolf Pen Creek watershed. According to the Flood Insurance Rate Maps for
Brazos County, Texas and incorporated area, Map Number 48041CO205E effective May 16, 2012; no
portion of this property is located in a 100-year flood hazard area.
Section 3 — Detention Determination
An SCS detailed study has been performed of the drainage basin that Falcon Point Condos is located
within in order to determine if detention is required with this phase of the development. The drainage
basin was divided into 2 areas (DAI and DA2) in order to determine the existing and proposed runoff
rates at the confluence of the main tributary and the discharge from the proposed development. The
results can be found in the attached Exhibit. A summary of the results are as follows:
Storm Event Pre -Development (cfs) Post -Development (cfs)
2 45.5 45.0
5 67.0 66.3
10 82.4 81.5
25 95.2 94.2
50 113.1 112.0
100 128.5 127.2
Based on this results, a detention facility is not proposed with this phase of the development.
Drainage Report
Falcon Point Condos
Section 4 — Reference
Exhibit A
Exhibit B
Exhibit C
Exhibit D
Exhibit E
Technical Design Summary
Drainage Area Map
HEC-HMS Results
Culvert Analysis
HEC-HMS Results
Drainage Report 2
Falcon Point Condos
EXHIBITS
Drainage Report
Falcon Point Condos
EXHIBIT A
Technical Design Summary
Drainage Report
Falcon Point Condos
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
applications that are in process with either City: plat(s), site plans, zoning requests,
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 L_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 August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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.
Dept.
Contact:
Date:
Subject:
Coordination
With Other
Departments of
Jurisdiction
City (Bryan or
College Station)
Coordination With
Summarize need(s) & actions taken (include contacts & dates):
Non jurisdiction
City Needed?
Yes —No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
Brazos County
Needed?
Yes No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
TxDOT Needed?
Yes No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
TAMUS Needed?
Yes _ No 7
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 ins aces below.
EntityPermitted
or
Status of Actions (include dates)
Approved ?
US Army Crops of
Engineers
No�Y_ Yes_
US Environmental
Protection Agency
No X Yes
Texas Commission on
Environmental Quality
No 1( Yes _
Brazos River
Authority
No X Yes
STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Start (Page 2.1)
Engineering and Design Professionals Information
Engineering Firm Name and Address:
Jurisdiction
MC 5f2vk a �nc�rne�i�l t���Ry�y�ng
City: Bryan
t'008 �j.«�CIM' k Sit /03
�_ College Station
Date of Submittal:/P 13 -/Z
�
Co(lee 514-or+ T-K 7-7 S 1/5
Lead ngineer's Nam�e and Contact Info.(pphhone, e-mail, fax):
��✓ER�"5w� '
Other:
EFF6iZ �• �TCY• eMU�u/�i6�wnr.t
Supporting Engineering / Consulting Firm(s):
Other contacts:
Developer / Owner / Applicant Information
Developers/Applicant Name and Address:
Phone and e-mail:
Sr,.� un%�
S�AII�SvD�t��rlk.ntt
Property Owner(s) if not Developer / Applicant (& address):
Phone and e-mail:
�Aq C q s, Ow.4 err
Project Identification
Development Name: FA6^ raieit 6r46
Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision?
SI4
If multi -phase, subject property is phase of
Legal description of subject property (phase) or Project Area:
(see Section II, Paragraph B-3a)
Ivri
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.
General Location of Project Area, or subject property (phase):
Nep iti}m5cc,+4% F Dw%94k'DnNc. ` 9vAr*%wA De.
In City Limits?
Extraterritorial Jurisdiction (acreage):
Bryan: acres..
Bryan: College Station:
College Station: I • ST acres.
Acreage Outside ETJ:
STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH, DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Continued (page 2.2)
Project Identification (continued)
Roadways abutting or within Project Area or
Abutting tracts, platted land, or built
subject property:
developments:
Named Regulatory Watercours s) & Watershed(s):
Tributary Basin(s):
unnrt O"I �I'R�6 �' (,.(o[�Pe„ Geek
Lj',J� P`v-, r,Vei,
Plat Information For Project or Subject Property (or Phase)
Preliminary Plat File #:
Final Plat File #: 2 eb9b Date: o )Z
Name:
Status and VollPg: erArn
If two plats, second name: File #:
Status: Date:
Zoning Information For Project or Subject Property (or Phase)
Zoning Type: �(�� xisting r Proposed? Case Code:
V�
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).
Participants:
4
Preliminary Report Required? Submittal Date 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.
t JA
STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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?
U"Qwei I.AJ -YR :o'.
Site
— Redevelopment of one platted lot, or two or more adjoining platted lots.
Development
Building on a single platted lot of undeveloped land.
Project
Building on two or more platted adjoining lots of undeveloped land.
(select all
applicable)
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
Construction of streets and utilities to serve one or more platted lots.
Development
Construction of streets and utilities to serve one or more proposed lots on
Project
_
lands represented by pending plats.
Site proiects: building use(s), approximate floor space, impervious cover ratio.
Describe
Subdivisions: number of lots by general type of use, linear feet of streets and
Nature and
Size of
drainage easements or ROW.
Proposed
Project
fir 13g SF-
Is any work planned on land that is not platted
If yes, explain:
or on land for which platting is not pending?
No Yes
FEMA Floodplains
Is any part of subject property abutting a Named Regulatory Watercourse
No Yes
(Section II, Paragraph 61) or a tributary thereof?
_�
Is any part of subject property in floodplain
No Yes Rate Map .9- j L' o%'I
area of a FEMA-regulated watercourse?
Encroachment(s)
into Floodplain
Encroachment purpose(s): Building site(s) Road crossing(s)
areas planed?
Utility crossing(s) _ Other (explain):
No
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.
STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
uE
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
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 management plan for the property in substantial conformance with the
earlier study? Yes No If not, explain how it differs.
No.
If subject property is not part of multi -phase project, describe stormwater management
plan for the 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.
Do existing topographic features on subject property store or detain runoff? _� No _ Yes
Describe them (include approximate size, volume, outfall, model, etc).
Any known drainage or flooding problems in areas near subject property? k_ No _ Yes
Identify:
Based on location of study property in a watershed, is Type 1 Detention (flood control) needed?
(see Table B-1 in Appendix B)
Detention is required. Need must be evaluated. Detention not required.
What decision has been reached? By whom?
n ,reov;r� . 5c-5 Stu l "by
If the need for
How was determination made?
Type 1 Detention
must be evaluated:
STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION I
APPENDIX D — TECHNICAL DESIGN SUMMARY
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?_ 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? _ No X Yes
Size(s) of area(s) in acres: 1) _LA_ 2) _ 46_ 3) 4)
Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable
concentrated section(s), small creek (non -regulatory), regulatory Watercourse or tributary);
40_ O�NUA�C n — `I'O2 Ar"I -}(vd Dna
Flow determination: Outline hydrologic methods and assumptions:
Sc5 Mef6(4/ RrC-0*15 ea4W M
1
GJ [,te, by AW AD;X li� 151-5 0A*;; AS a ("ole%;cs
Does storm runoff drain from public easements or ROW onto or across subject property?
No *< Yes If yes, describe facilities in easement or ROW: rP cvtvPert
Are changes in runoff characteristics subject to change in future? Explain
�J® - Alrt.Aw dmeloped s4-e
Conveyance Pathways (Section II, Paragraph C2)
Must runoff from study property drain across lower properties before reaching a Regulatory
Watercourse or tributary? No Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies).
STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
A®in_ ritlVIAq
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics I
Continued (Page 3.4)
Hydrologic Attributes of Subject Property (or Phase) (continued)
Conveyance Pathways (continued)
Do drainage
If yes, for what part of length? % Created by? _ plat, or
easements
instrument. If instrument(s), describe their provisions.
exist for any
part of
pathway(s)?
No
Yes
Where runoff must cross lower properties, describe characteristics of abutting lower
property(ies^s)``. (Existing watercourses? Easement or Consent aquired?)
Pathway
X
Areas
9999 1 X
9
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, lined channels, buried conduit, swales, detention ponds, etc).
Nearby
Drainage
Facilities
Do any of these have hydrologic or hydraulic influence on proposed stormwater
design? No Yes If yes, explain:
STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Start (Page 4.1)
StormwaterManagement Concept
Discharge(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 discharg/e� point.
'1 � eK1y�'�nc, tlan� Wil( ge Attohueno�/t(zel �Y W�•2P CxPANStsV�
L 4i e,,W } 4r 4%t- 45 Awe }*4ri w:1t CnhvRC
pPgo,;,d
CAW k c4 �Jvcked.
Discharge(s) To Lower Property(ies) (Section ll, Paragraph E1)
Does project inc ude drainage features (existing orfuture) proposed to become public via
platting? A No _Yes Separate Instrument? No Yes
Per Guidelines reference above, how will
Establishing Easements (Scenario 1)
runoff be discharged to neighboring
property(ies)?
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 #___)
ruW�WfS hqvc bee^ -5IVUW% at-
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.
STORMWATER DESIGN GUIDELINES Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION I
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept (continued)
Within Proiect Area Of Multi -Phase Project
Identify gaining Basins or Watersheds and acres shifting:
Will project result
in shifting runoff
between Basins or
between
What design and mitigation is used to compensate for increased runoff
Watersheds?
from gaining basin or watershed?
No
Yes
How will runoff from Project
1. — With facility(ies) involving other development projects.
Area be mitigated to pre-
development conditions?
2 Establishing features to serve overall Project Area.
Select any or all of 1, 2,
3. _ On phase (or site) project basis within Project Area.
and/or 3, and explain below.
}. bet';CV&A A( - redy b
1. Shared facility (type & location of facility; design drainage area served; relationship to size of
Project Area): (Attached Exhibit #)
2. For Overall Proiect Area (type & location of facilities): (Attached Exhibit #----)
3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in
subsequent questions of this Part.
Are aquatic echosystems proposed? No Yes In which phase(s) or
project(s)?
r
Are other Best Management Practices for reducing stormwater pollutants proposed?
Q.
No Yes Summarize type of BMP and extent of use:
y
c
o
C) Z
ca
If design of any runoff -handling facilities deviate from provisions of B-CS Technical
>`I
Specifications, check type facility(ies) and explain in later questions. j
/
WI
A
fD
Detention elements Conduit elements _ Channel features
Swales Ditches Inlets — Valley gutters_ Outfalls
Culvert features — Bridges Other
STORMWATER DESIGN GUIDELINES Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desian Parameters
Continued (Page 4.3)
"Stormwater 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).
0I�
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):
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 96 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?
v
'
}
Steepest side slopes:
Usual front slopes:
Usual back slopes:
1nVI
d
u
Flow line slopes: least
Typical distance from travelway:
a
typical
(Attached Exhibit #)
o
N z
%greatest
�V
a
/
a
m
° K
Are longitudinal culvert ends in compliance with B-CS Standard Specifications?
Yes No, then explain: N
y
At intersections or otherwise, do valley gutters 'cross arterial or collector streets?
a }
U N
No _Yes If yes explain:
.0 N
/nv'
N
Are valley gutters proposed to cross any street away from an intersection?
rn 0
_ No _ Yes Explain: (number of locations?)
co
4
/V��
STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION I
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainaae Concept and Desian Parameters
Continued (Page 4.4)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Gutter line slopes: Least Usual Greatest
Are inlets recessed on arterial and collector streets? Yes No If "no",
identify where and w^hfy.
f V ��-
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)? No If no, explain.
_Yes
c 'a
Sag curves: Are inlets placed at low points? Yes No Are inlets and
g w
conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches?
L
Yes _ No Explain "no" answers.
m
jj
" ik
w
d
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.
rNJk
Are any 12-inch laterals used? No Yes Identify length(s) and where
used.
N f
n.
y
Pipe runs between systeJn
Typical Longest ✓
access points (feet):
2Are
junction boxes used'at each bend? Yes _ No If not, explain where
w
and why.
C
(Llk
z°
NNENE
Are downstream soffits at or below upstream soffits?
Least amount that hydraulic
w
Yes No If not, explain where and why:
grade line is below gutter line
(system -wide):
d Q
111fv
STORMWATER DESIGN GUIDELINES Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainaae Concept and Design Parameters
Continued (Page 4.5)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Describe watercourse(s), or system(s) receiving system discharge(s) below
W(include
design discharge velocity, and angle between converging flow lines).
m
1) Watercourse (or system), velocity, and angle?
.-. o
itlA
a2)
Watercourse (or syystem), velocity, and angle?
o
0 d
y f�,^L
U -
E N
n
NE
Ca
3) Watercourse (or system), velocity, and angle?
�a
O
.r n
mo
v a
IV CC
E m
For each outfall above, what measures are taken to prevent erosion or scour of
yreceiving
and all facilities at juncture?
�
1)
m
o.
^"n�
/u
2) p
°)
rC
N
0
3)
Are swale(s) situated along property lines between properties? No Yes
Number of instances: For each instance answer the following questions.
Surface treatments (including low -flow flumes if any):
a�
m }
�
Flow line slopes (minimum and maximum):
a
nn
0
o
Z
m
Outfall characteristics for each (velocity, convergent angle, & end treatment).
Q
Will 100-year design storm runoff be contained within easement(s) or platted drainage
ROW in all instances? _ Yes _ No If "no" explain:
M/
STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.6)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
w
Are roadside ditches used? �_ No _ Yes If so, provide the following:
Is 25-year flow contained with 6 inches of freeboard throughout ? _ Yes _ No
w
Are top of banks separated from road shoulders 2 feet or more? Yes No
_ _
Are all ditch sections trapezoidal and at least 1.5 feet deep? _ Yes No
aFor
any "no" answers provide location(s) and explain:
o
If conduit is beneath a swale, provide the following information (each instance).
Instance 1 Describe general location, approximate length:
>
Is 100-year design flow cont9 fined in conduit/swale combination? Yes No
_ _
If "no" explain: n r n
z N
Space for 100-year storm ow? ROW Easement _ Width
XIc
Swale Surface type, minimum
and maximum slopes:
CondlJit Type and size, minimum and maximum
slopes, design storm:
c
m v
ON-
A/A-
6 m
Inlets Describe hoW conduit is loaded (from streets/storm drains, inlets by type):
U Co
C �
.
0 o
Access Describne' how maintenance access is provided (to swale, into conduit):
�
� w
III
a)
Instance 2 Describe general location, approximate length:
vEd
m
,V I
m
d
n :a
Is 100-year design flew contained in conduit/swale combination? Yes No
a
_ _
If "no" explain:
m
AIA-
E
o t
Space for 100-year storm flow? ROW Easement _ Width
w a)
Swale Surface type, i imum
Conduit Type and size, minimum and maximum
v m
and maximum slopes:,
slopes, design storm: N A
Co
Inlets Describe how conduit i loaded (from streets/storm drains, inlets by type):
a
3 0
hk
N
Access Describe how maintenance access is provided (to swale, into conduit):
V(
STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainaqe Concept and Design Parameters
IContinued (Page 4.7)
Stormwater ManagementConcept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
If "yes" provide the following information for each instance:
Instance 1 Describe general location, approximate length, surfacing:
a
1�
W
w
o y
Is 100-year design flood contained in swale? Yes No Is swale wholly
_ _
within drainage ROW? Yes No Explain "no" answers:
>
I
M
5
Access Describe how maintenance access is provide:
o
c
0
I
rice-2 Describe general location, approximate length, surfacing:
a)
� w
s �
r
L N
K
3
Is 100-year design flow contained in swale? Yes Is swale wholly
`o
—No
within drainage ROW? Yes _ No Explain "no" answers:
ca
o
S
T&
Q�
Access Describe how m intenance access is provided:
U
Z
n`)I
Instance 3, 4, etc. If swales are used in more than two instances, attach sheet
providing all above information for each instance.
channels: Will �any area(s) of concentrated flbw be channelized (deepened,
widened, or straightened) or otherwise altered? _anNo _ Yes If only slightly
o•
shaped, see "Swales" in this Part. If creating side bks, provide information below.
.�
Will design replicate natural channel? Yes No If "no", for each instance
o a
_ _
describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year
o W
design flow, and amount of freeboard:
CL
N �
Instance 1:
C }
N
Q
JFy`
E
o
Instance 2:
a
E o
— Z
Instance 3:
U6
ca
STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.8)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Existing channels (small creeks): Are tb se used? No _ Yes
If es" provide the information below. /U
Will small creeks and their floodplains remain undisturbed? Yes _ No How
many disturbance instances? Identify each planned location:
For each Ilocation, describe length and general type of proposed improvement
(including floodplain changes):
�k
For each location, describe section shape & area, flow line slope (min. & max.),
surfaces, and 100-year design flow.
c
Watercourses (and tributaries): Aside from fringe changes, are Regulatory
Watercourses proposed to be altered? No Yes Explain belovflr
_
c
Submit full report describing proposed changes to Regulatory Watercourses. Address
E
existing and proposed section size and shape, surfaces, alignment, flow line changes,
>
length affected, and capacity, and provide full documentation of analysis procedures
and data. Is full report submitted? Yes No If "no" explain:
n
c
c
111
vAll
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.
�Ia
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 maintenance space?
Yes _ No If not, identify location(s) and explain:
4
STORMWATER DESIGN GUIDELINES Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION I
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.9)
Within Or Serving Subject Property (Phase, or Site) (continued)
How many facilities for subject property project? For each provide info. below.
For each dry -type facilitiy: Facility 1 Facility 2
Acres served & design volume + 10%
100-yr volume: free flow & plugged
Design discharge (10 yr & 25 yr) Knoo
Spillway crest at 100-yr WSE? � e_yes no
Berms 6 inches above plugged WSE? _ yes_yes _ no
Explain any "no" answers:
511
0
0-
2
a
0
ca
m
u_
0
a)
a�
0
(,,�
For each facility what is 25-yr design Q, and design of outlet structure?
Facility 1:,
Facility 2:
Do outlets and spillways discharge into a public facility in easement or ROW?
Facility 1: _Yes _No Facility 2: _ Yes _ No
If "no" explain:
For each, what is velocity of 25-yr design discharge at outlet? & at s il- p Iway?
Facility 1: & Facility 2: &
Are energy dissipation In
used? _ No _ Yes Describe type and
location: 1
�I�
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
Facility 1: p � &Facility 2: 9�
are taken
Facility 1:
Facility 2:
If berms are used give heights,
Facility 1:
I Vl
Facility 2:
or scour at
treatments
STORMWATER DESIGN GUIDELINES Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desgnn Parameters
I Continued (Page 4.10)
Stormwater Management Concept (continued);
Within Or Serving Subject Property (Phase, or Site) (continued)
Do structures comply with B-CS Specifications? Yes or no, and explain if "no":
Facility 1;
w
AD
LL
Facility 2:
c
o C
C U
N
oFor
additional facilities provide all same information on a separate sheet.
Are parking areas to be used for detention? _ No —Yes What i n�
maximum depth due to required design storm? 1
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:
y
c
oAre
culvertsrllel to public roadway alignment? _Yes _No Explain:
U m
N
rt
`❑ 1�I
CrPrivate Drives: Do private driveways, drives, or streets cross drainage
m
ways that serve Above -Project areas or are in public easements/ ROW?
NZ
_ No X Yes If "yes" provide information below.
How many instances? Describe location and provide information below.
p�_
Location 1: 2�OI of f-,ftp aT 5i t
c3i
Location 2: yZ' }�pPb �As� dull �r�9 Z
Location 3:
For each location enter value for:
1
2
3
Design year passing without toping travelway?
too
is
Water depth on travelway at 25-year flow?
a
p
Water depth on travelway at 100-year flow?
p
3"
For more instances describe location and same information on separate sheet.
STORMWATER DESIGN GUIDELINES Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.11)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
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?
NNo
Yes How many instances? For each identify the
u:
location and provide the information below.
ro m
Y a
Instance 1:
N
Instance 2:
c
o
Instance 3:
c
0
0 ca
Yes or No for the 100-year design flow:
1
2
3
o
Headwater WSE 1 foot below lowest curb top?
h�
Spread of headwater within ROW or easement?
y
Is velocity limited per conditions (Table C-11)?
NExplain
any "no' answer(s):
o a
U
co U
%
a
cc
s
Minor Collector or Local Streets: Will culverts serve these types of streets?
N
No Yes How many instances? for each identify the
location and provide the information below:
a m
m a
Instance 1: /�
Instance 2: jny
as
u o
Instance 3:
For each instance enter value, or "yes" / "no" for:
1
2
3
U a3
o
Design yr. headwater WSE 1 ft. below curb top?
G
Q .�
`o
100-yr. max. depth at street crown 2 feet or less?
r
E
Product of velocity (fps) & depth at crown (ft) = ?
i
Is velocity limited per conditions (Table C-11)?
Limit of down stream analysis (feet)?
Explain any "no' answers:
1
STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside
ditch intersects) provide information requested in next eight boxes.
Do culverts and travelways intersect at 90 degrees? —Yes —No Knot,
identify location(s) and intersect angle(s), and justify the design(s):
K41i�
Does drainage way alignment change within or near limits of culvert and surfaced
approaches thereto? _ No _ Yes If "yes" identify location(s), describe
change(s), and justification:
�.('/k
Are flumes or conduit to discharge into culvert barrel(s)? No _Yes If yes,
identify location(s) and provide justification:
l�
Are flumes or condu t to discharge into or near surfaced approaches to culvert ends?
No _ Yes If "yes" identify location(s), describe outfall design treatment(s):
c
c
0
k
Is scour/erosion protection provided to ensure long term stability of culvert structural
0
components, and surfacing at culvert ends? Yes —No If "no" Identify
locations and provide justification(s):
91A
Will 100-yr flow and spread of backwater be fully contained in street ROW, and/or
drainage easements/ ROW? _ Yes _ No if not, why not?
ilk
Do appreciable hydraulic efpects of any culvert extend downstream or upstream to
neighboring land(s) not encompassed in subject property? No Yes If
"yes" describe location(nsJ) nd mitigation measures:
%V
Are all culvert designs and materials in compliance with B-CS Tech. Specifications?
Yes _ No If not, explain in Special Design Section of this Part.
STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.13)
Stormwater Management Concept (continued)
Within Or Serving Subject Property
(Phase, or Site) (continued)
Is a bridge included in plans for subject property project? _ No Yes
_
If "yes" provide the following information.
Name(s) and functional classification of the roadway(s)?
What drainage way(s) is to be crossed?
m
N�v
to
A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical,
hydrologic, and hydraulic factors) must accompany this summary report. Is the report
provided? _Yes, No If "no" explain:
Is a Stormwater
Provide a general description of planned techniques:
Pollution Prevention
Plan
{, ,fit L
5WPPP Weil 6� I �^� ��SrN//15r+�1'i
Ci
(SW3P)
established for
�mfZ /I
Cdr F1^-Ifn,dt� C�751D� c°�+b �IAh
m
project construction?
9
X No _ Yes
P�S Lee.,.Ar&vra(rq � $WQp.
f
Special Designs - Non -Traditional Methods
Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream
replication, BMPs for water quality, etc.) proposed for any aspect of subject property project?
—4 No _ Yes If "yes" list general type and location below.
Provide full report about the proposed special design(s) including rationale for use and
expected benefits. Report must substantiate that stormwater management objectives will not
be compromised, and that maintenance cost will not exceed those of traditional design
solution(s). Is report provided? _ Yes _ No If "no" explain:
STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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 Techni a Specifications, check type facility(ies) and explain by specific detail element.
_ Det t�o elements Drain system elements _ Channel features
Culvt fWes Swales _ Ditches Inlets _Outfalls
Valley g ters 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) j
3>
4)
5)
Design Parameters
Hydrology
Is a map(s) showing all Design Drainage Areas provided? ii Yes No
Briefly summarize the range of applications made of the Rational Formula:
mw-
What is the size and location of largest Design Drainage Area to which the Rational Formula
has been applied? acres Location (or identifier):
STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised Aucust 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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 _ 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? )_ 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
JiA
Storm drain system for local streets
Open channels
A
Swale/buried conduit combination in lieu of channel
P
Swales
5 0 25So. Ieo
?3�
Roadside ditches and culverts serving them
N
Detention facilities: spillway crest and its outrall
14
Detention facilities: outlet and conveyance structure(s)
Detention facilities: volume when outlet plugged
Culverts serving private drives or streets
S to 26 Sd lop
1 7-5: lao
Culverts serving public roadways
N�A
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)
12
15 ,1
Lowest (feet per second)
4.1
y1
Streets and Storm Drain Systems Provide the summary information outlined below:
Roughness coefficients used: For street gutters:
For conduit type(s) l C O.Of 0.0/Z Coefficients:
STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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 7< No —Yes
Explain any "yes" answer:
In conduit is velocity generally increased in the downstream direction? OW Yes —No
Are elevation drops provided at inlets, manholes, and junction boxes? —Yes —No
Explain any "no" answers: 't l
JV A
Are hydraulic grade lines calculated and shown for design storm? X Yes _ No
For 100-year flow conditions? _)(_Yes _No Explain any "no" answers:
What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify
each location and explain:
(,' Icv[4W nmemA ( dlf�k- wee( en Leh
cress secfon
Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? es _ No
Outside of straight sections, is flow regime within limits of sub -critical flow? _ Yes _ No
If "no" list locations and explain:
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?
T=nlck
Entrance, friction and exit losses:
or
Fs-i;Ai6�- I.ZS
ea�,% —1•0
Bridges Provide all in bridge report
STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
✓04
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
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
��el 4p„e��S[1Pe'E" — C•,�veFf' A+i�tiysi'S
Part 6 - 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 Part B was prepared
by me (or under my supervision) in accordance with provisions of the Bryan/College Station
Unified Drainage Design Guidelines for the owners of the property. All licenses and permits
required by any and all state and federal regulatory agencies for the proposed drainage
improvements have been issued or fall under applicable general permits."
(Affix Seal)
Licens P6Aissional Engineer -
State of Texas PE No. 14-74 ;'
STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
EXHIBIT B
Drainage Area Map
Drainage Report
Falcon Point Condos
EXHIBIT C
HEC-HMS Results
Drainage Report
Falcon Point Condos
2 Year Storm
Project: FALCON Simulation Run: 2 Year
Start of Run: 013un2007, 00.00 Basin Model: Falmn Point
End of Run: 02Jun2007, 00:30 Meteorologic Model: 2 Year
Compute Time: 18F62013, 09.00:99 Control Specifications: Control 1
Show Elements: 41 Element Volume Units: _o, PJ AC -FT Sorting: Hydrologic
Hydrologic
Element
Drainage Area
(MI2)
Peak urge
(CFS)
Time of Peak
Volume
M
DA 1 Existing
0.0703
42.7
011un2007, 13.20
3.36
DA 2 Existing
0.0064
7.5
013un2007, 12:35
4.04
Ex. Study Paint
0.0767
45.5
011un2007, 13:15
3.42
DASProposed
0.0703
42.7
O11un2007, 13:20
3.36
DA 2 Proposed
0.0064
fi.2
017unZ007, 12:30
4.08
Prop. Study Point
0.0767
45.0
O11un2007, 13:15
3.42
5 Year Storm
Project: FALCON Simulation Run: S Year
Start ofRun: OIJun2007, 00:00 Basin Model: Falcon Point
End of Run: 02Jun2007,00:30 Meteorologic Model: 5Year
Compute Time: 18F6201.3, 09:00:59 Control Specifications: Control 1
Show Elements: All Elements -- Volume Units: ra, IN !_ � ACTT Sorting: liydralogic
Hydrologic
Dement
DtainageArea
0"
Peak Discharge
(CFS)
Time of Peak
Vohane
(I j
DA 1 Existing
0.0703
63.0
010un2O07, 13:20
4.95
DA 2 FAsting
0.0064
10.6
013un2007, 12:35
5.71
Ex. Study Point
0.0767
67.0
O11un2007,13:15
5.01
DAS Proposed
0.0703
63.0
011un2007, 13:20
4.95
DA 2 Proposed
0.0064
1
Ol]un2007, 12:30
5.75
Prop. Study Point
0.0767
i5
66.3
011un2007, 13:15
5.02
Drainage Report
Falcon Point Condos
10 Year Storm
Project: FALCON Simulation Run: 10 Year
Start ofRim: 013un2307, 00:00 Basin Model: Falcon Point
End of Run: 023un2007, 00:30 Meteorologic Model.: 10 Year
Compute Time: 18Feb2013, 09:00:37 Control Specifications: Control 1
Shone Elements: li All Elements -- Volume Units: # IN r; ACFr Sorting:
Hydrologic
Element
DraahageArea
(Mi2)
Peak Discharge
(CFS)
Time of Peak
Volume
(IIV]
DA 1 Existing
0.0703
77.5
011un2007, 13.20
6.09
DA 2 Existing
0.0064
12.8
013un2007, 12:35
6.89
Ex. Study Point
0.0767
814
013un2007, 13:15
6.16
DA1 Proposed
0.0703
77.5
013un2007, 13:20
6.09
DA 2 Proposed
0.0064
13.9
013un2007, 12:30
6.93
Prop. Study Point
0.0767
81.5
D17un2007, 13:15
6.16
25 Year Storm
Project: FALCON Simulation Run: 25Year
Startof Run: 013un2007, 00:00 Basin Model: Falcon Point
End of Run: 023un2007, 00:30 Meteorologic Model: 25 Year
Compute Tone: 1SFeb2013, 09:00:45 Control Specifications: Control 1
Show Elements: AU Elements Volume Units: L, IN 0 AC -FT Sorting: Hydrologic.
Hydrologic
Element
Drainage Area
K2)
Peak Discharge
(CFS)
Time of Peak
Volume
(IN)
DA 1 EAsting
0.0703
89.6
013un2o07, 13:20
7.05
DA 2 Existing
0.0064
14.7
013un2007, 1235
7.88
Ex. Study Point
0.0767
95.2
013un2007, 13:15
7.12
DAS Proposed
0.0703
89.6
011un2007, 13:20
7.05
DA 2 Proposed
0.0064
15.9
013un2007, 12:30
7.92
Prop. Study Point
0.0767
94.2
01Iun2007, 13:15
7.12
Drainage Report
Falcon Point Condos
50 Year Storm
Project: FALCON Sir dation Run: SO Year
Startof Run: Oilun2007, 00:00 Basin Model: Falcon Point
End of Run: 023unM07, 00:30 Meteorologic Model: 50 Year
Compute Time: 18Fe62013, 09:00:54 Control Specifications: Control 1
Show Elements; AO Eleement l Volume Units::# IN [_ AC -FT Sorting: 'Hydrologic
Hydrologic
Element
Drainage Area
(II2)
Peak Discharge
(CFS)
Time of Peak
I
Volume
IN
DA l Exi ti v
0.0703
306.6
013un2007, 13:20
8.40
DA2Existing
0.0064
17.2
O13un2007, 12:35
9.27
Ex. Study Point
0.0767
113.1
013un2007, 13:15
8.47
DA1 Proposed
0.0703
6.6.6
013un2007, 13.20
8.40
DA 2 Proposed
0.0064
18.6
013un2007, 12:30
9.31
Prop. Study Paint
0.0767
112.0
013un2007, 13:15
8.48
100 Year
Storm
Project FALCON Simulation Run: 100 Year
- Start of Run: 013un2007, 00:00
Basin Model:
Falcon Point
End of Run: 023un2007, 00:30
Meteorologic Model:
100 Year
Compute Time: 18Fe62013, 09:00:17
Control Specifications: Control 1
Show Elements: j Ail Elements Volume Units:
4, IN C_ AC -FT
Sorting: Hydrologic
Hydrologic
Element
Drainage Area
(PII2)
Peak Disdrarge
(CFS)
Tme of Peak
Volume
0M
DA 1Existing
0.0703
i21.1
Oilun2OO7,13:20
9,57
DA 2 E)dsting
0.0064
19.4
013un2007, 12:35
10.46
Ex. Study Point
0.0767
128.5
013un2007, 13:15
9.64
DASProposed
0.0703
12L1
013un2007, 13.20
9.57
DA 2Proposed
0.0064
21.0
013.m2007, 12.30
10.51
Prop. Study Point
0.0767
127.2
O13un2007, 13:25
9.64
Drainage Report
Falcon Point Condos
w
/
r`
.
s
a
Z
.I--� . -S 1 '? 1 i® W
-,I-
- -tea _
Drainage Report
Falcon Point Condos
SITE PLAN
College Station, Texas
NOVEMBER 2012
MBESI# 1000-0243
SUBMITTED BY:
Lei McCLURE & BROWNE, ENGINEERING/SURVEYING, INC.
1008 Woodcreek Dr., Suite 103 College Station, Tx. 77845 (979) 693-3838 Engineer Reg. No. E-458 II
1314 10th Street, Suite 210 Huntsville, Tx. 77320 (936) 294-9749 Survey Reg. No. 101033-00
Falcon Point Condos
Stormwater Management Technical Design Summary Report
MBESI No. I000-0243
PART 1— Executive Summary Report
Section 1— Contact Information
Project Designer: McClure and Browne Engineering and Surveying, Inc.
1008 Woodereek Drive, Suite 103
College Station, TX 77845
979-693-3838
Project Developer: Scott Ball
_ College Station, TX 77845
(979)774-5777
Section 2 — General Information and Project Location
This development is a proposed condominium project involving two buildings and the associated
parking and utility improvements. The development is entirely located within the city limits of College
Station.
The project site is in the Wolf Pen Creek watershed. According to the Flood Insurance Rate Maps for
Brazos County, Texas and incorporated area, Map Number 48041CO205E effective May 16, 2012; no
portion of this property is located in a 100-year flood hazard area.
Section 3 — Reference
ExhibitA
Technical Design Summary
Exhibit B
Drainage Area Map
Exhibit C
HEC-HMS Results
Exhibit D
Culvert Analysis
Drainage Report 1
- Falcon Point Condos
City of College Station
Administrative Approval for Required Parkland Dedications of Less than Five Acres
1. Applicant
Address: 3091 University Drive East College Station TX 77840
Phone: (979) 777-4675 E-Mail: milesconstructionp_gmail com
2. Development Name: Falcon Point Condos — Phase 1 Project #: 12-262
Development Location: 1915 Dartmouth Street
3. Dwelling Units: 0 Single Family 33 Multi -family Units, located in Neighborhood Park Zone 3
0 Single Family 33 Multi -family Units, located in Community Park Zone C
4. Development Fees and Dedication Requirements:
a. Land Dedication or Fee in Lieu of Land (Choose One):
Neighborhood Community Total
Single Family: One (1) acre per 117 DU's 0 ac One (1) acre per 128 DU's 0 ac = 0 ac-
Multi-family: One (1) acre per 117 DU's 0 ac One (1) acre per 128 DU's 0 ac = 0_� ac
OR- TOTAL = 0 T Acres
�
Fee Paid in Lieu of Land Dedication
Neighborhood Community
Single Family: @ $274 °° per DU $ 0 @ $250.00 per DU $ 0 = $ 0
Multi -family: @ $274 00 per DU $ 9,042.00 @ $250 °° per DU $ 8.250.00 =
$ 17.292 00
TOTAL (Neighborhood and Community) _ $ 17.292.00
b. Development Fee:
Neighborhood Community Total
Single Family @ $362 w per DU $ 0 Single Family @ $375.00 per DU $ 0 = $ 0
Multi -family @ $362 00 per DU $11,946.00 Multi -family @ $750 °° per DU $ 24,750.00 = $ 36. 996.00
TOTAL (Neighborhood and Community) _ $ 36,696.00,
5. Comments: Fees for future phases will be collected as each additional phase is built
The City of College Station agrees to accept:
GRAND TOTAL (Neighborhood and Community) 33 Units x $1,636.00 = $ 53,988.00
Land Dedication 0 acres
L�`i3
Name Date
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Falcon Point Condos
MBESI PROJ #: 1000-0243
Engineer's Estimate of Construction Costs
February 4, 2013
Item # Description I Unit Quantity I Unit Price Total
Paving Construction
1 6" Re nforced Concrete Pavement I S.Y. 2051 $45.00I $9.225.00
Subtotal
RPWPr Rvatem Cnnetmirtinn
2
Standard Manhole, 0-6 ft. deep
EACH
2
$2 200.00
$4 400 00
3
ITrench Safety_ (sewer)
L.S.
11
$500.001
$500 00
Sewer System Subtotal
1 $4,900
Erosion Control Construction
Erosion Control Plan & Sedimentation Control (per Item
4
106) (includes monitoring, record keeping, grass seeding,
L.S.
1
$3,000.00
$3,000.00
and cleanup)
Erosion Control Subtotal 1 $3,000
Construction Cost 1 $17 125
JEFFERY !_. ROBERTSON
I
1 of
i z- z6a.
9:s� kk
February 4, 2013
Ms. Erika Bridges, PE
City of College Station
Post Office Box 9960
College Station, TX 77842
Re.: LETTER ACKNOWLEDGING CITY STANDARDS
Falcon Point Condos
MBESI No. 1000-0243
Dear Ms. Bridges:
The purpose of this letter is to acknowledge that the construction plans for the water, sanitary
sewer, streets and drainage for the above -referenced project, to the best of my knowledge, do
not deviate from the B/CS Design Guideline Manual. Any alternate design or construction
methodology that was used is listed below:
I also acknowledge, to the best of my knowledge, that the details provided in the construction
plans are in accordance with the Bryan/College Station Standard Details.
Sincerely,
oneson, PEJ t
F\1059 - Edelweiss Gartens Venture\0008 - Edelweiss Gartens Phase 13\Correspondence\Letter Acknowledging City Standards.wpd
IA- 21.02,
z-*-13
q.56 K14
McCLURE & BROWNE, ENGINE R NGISURV EYING, INC.
1008 Woodoreek Dr., Suite 103 � College station. Tx. 77845 (979) M-3838
1314 10tn Stn,-et, Suite 210 Huntsville, Tx. 77320 (936) 294-9749
February 18, 2013
Ms. Erika Bridges, PE
City of College Station
Post Office Box 9960
College Station, TX 77842
Re.: FIRE FLOW LETTER
Falcon Point Condos
MBESI No. 1000-0243
Dear Ms. Bridges:
Engineer Reg. No. F-458
Survey Reg, No. 101033-DO
The purpose of this letter is to confirm that the buildings proposed with the Falcon Point Condos
project conform with the assumptions made in the Falcon Point Water Report in November
2012. An additional fire hydrant will be necessary in order to provide a hydrant within 100' of the
fire department connection of building #2.
Sincerely,
F.11059 - Edelweiss Gartens VenW. \=08 - Edelweiss Gartene Phase 13tCorraspondence\Lefler Acknowtedginy City Sl ndards.wpd
McCLURE & BROWNE, ENGINEERING/SURVEYING, INC.
1008 Woodcreek Dr., Suite 103 College Station, Tx. 77845 (979) 693-3838 Engineer Reg. No. F-458
1314 10th Street, Suite 210 Huntsville, Tx. 77320 (936) 294-9749 Survey Reg. No. 101033-00
February 27, 2013
Erika Bridges, PE
City of College Station
Dear Erika,
The attached exhibits are updates to the Fire Flow Analysis for the Falcon Point Subdivision
on Dartmouth Drive in College Station. During the design of the site plan for this project it
became necessary to install a fire hydrant on the 8" line that runs along the south border of
the property. This analysis shows how the existing and proposed water lines perform during
a fire flow event.
According to Exhibit C, all pipes meet the velocity and pressure requirements of the City of
College Station. Therefore we determine that the addition of the proposed fire hydrant will
have no adverse impacts on the water infrastructure in the area.
If you have any questions, please do not hesitate to contact me.
Sincerely,
Jeff Robertson
Vice President -Engineering
VP-1
Ex. 6" W/L v
I
Uf '1 CL
WATER MODElwATER ENE ABN'ALAYSIS MAP
SCALE: Hor: 1" — FALCON POINT CONOOS
®LLEGE STATION, BRAZOS COUNTY, TEXAS
o so' ioo'
Q J fW8 W E& BR S ENGINEER/NG/SU, EYING, INC
(99 693 reek Dove, (97 lOJ, Cooege Srorron, 1X )lBAS
(9)9) 69T-39JB Fax: (9l9) 69J-2554
m Reg. No. F-458
EXHIBIT B
STATIC FLOW
* * * * * * * * * * K Y P I P E 5
* *
* Pipe Network Modeling Software
* *
* Copyrighted by KYPIPE LLC
* Version 5 - February 2010
* x
x * * * x x * * x x * x + + + * + x x + * * x x x x * x *
Date & Time: Wed Feb 27 16:39:28 2013
Master File : f:\1062 - clarke & wyndham inc\0031 - holleman - dartmouth
plat\docs\10620031-stat.KYP\10620031-stat.P2K
w*********************ww*xxxw+*xx*xxxwwx********
S U M M A R Y O F O R I G I N A L D A T A
wwx*w*wwxwxwxxwwww+i:wwwwwwwxwwwwwwww*wi:wwww+w*+i:
U N I T S S P E C I F I E D
FLOWRATE ............ = gallons/minute
HEAD (HGL) .......... = feet
PRESSURE ............ = psig
P I P E L I N E D A T A
STATUS CODE: XX
-CLOSED
PIPE CV
-CHECK VALVE
P I
P E
NODE
NAMES
LENGTH
DIAMETER
ROUGHNESS
MINOR
N A
M E
#1
#2
(£t)
(in)
COEFF.
LOSS COEFF.
-------------------------------------------------------------------------------
P-1
VP-1
J-5
75.00
6.00
125.0000
0.00
P-2
J-3
J-1
100.00
8.00
125.0000
0.00
P-3
J-4
J-6
463.07
8.00
125.0000
0.00
P-4
J-2
VP-2
15.00
6.00
125.0000
0.00
P-5
J-1
J-2
437.00
8.00
125.0000
0.00
P-6
J-5
J-4
137.00
8.00
125.0000
0.00
P-7
J-6
J-3
252.93
8.00
125.0000
0.00
P U M
P/L 0 S S E
L E M E
N T D A
T A
THERE
IS A DEVICE AT
NODE
VP-1
DESCRIBED
BY THE FOLLOWING DATA: (ID= 1)
HEAD
FLOWRATE
EFFICIENCY
(ft)
(gpm)
M
258.46
0_00
75.00
235.38
1455.00
75.00
175.15
2910.00
75.00
STATUS CODE:
XX -CLOSED
PIPE
CV -CHECK VALVE
P I P E
NODE
NUMBERS
FLOWRATE
HEAD
MINOR
LINE
HL+ML/
HL/
N A M E
#1
42
LOSS
LOSS
VELD.
1000
1000
(gpm)
(ft)
(£t)
(£t/s)
(ft/ft)
(ft/ft)
---------------------------------------------------------------------------------------
P-1
VP-1
J-5
104.00
0.09
0.00
1.18
1.21
1.21
P-2
J-3
J-1
0.00
0.00
0.00
0.00
0.00
0.00
P-3
J-4
J-6
52.00
0.04
0.00
0.33
0.08
0.08
P-4
J-2
VP-2
0.00
0.00
0.00
0.00
0.00
0.00
P-5
J-1
J-2
0.00
0.00
0.00
0.00
0.00
0.00
P-6
J-5
J-4
104.00
0.04
0.00
0.66
0.30
0.30
P-7
J-6
J-3
26.00
0.01
0.00
0.17
0.02
0.02
P U M P/L O S S E L E M E N T R E S U L T S
INLET
#PUMPS NPSH
NAME FLOWRATE HEAD
PARALLEL SERIES Avail.
(gpm) (ft)
(ft)
------------------------------
-----------------
VP-1 104.00 0.00
** 33.2
Device "VP-2" is closed
VP-2 0.00 0.00
** 33.2
N O D E R E S U L T S
NODE NODE
NAME TITLE
J-1
J-2
J-3
J-4
J-5
J-6
VP-1
VP-2
OUTLET PUMP EFFIC- USEFUL INCREMTL TOTAL #PUMPS
HEAD HEAD ENCY POWER COST COST
(ft) (ft) M (Hp) ($) ($)
-----------------------------------------------------
258.29 258.3 75.00 0. 0.0 0.0 **
257.11 0.0 75.00 0. 0.0 0.0 **
EXTERNAL
HYDRAULIC
NODE
PRESSURE
NODE
DEMAND
GRADE
ELEVATION
HEAD
PRESSURE
(gpm)
------------------------------------------------
(ft)
(ft)
(ft)
(psi)
0.00
528.11
271.00
257.11
111.42
0.00
528.11
272.00
256.11
110.98
26.00
528.11
271.00
257.11
111.42
52.00
528.16
269.50
258.66
112.08
0.00
528.20
269.50
258.70
112.10
26.00
528.12
271.00
257.12
111.42
----
528.29
270.00
258.29
111.92
----
526.11
271.00
257.11
111.42
M A X I M U M A N D M I N I M U M V A L U E S
P R E S S U R E S
JUNCTION MAXIMUM JUNCTION
NUMBER PRESSURES NUMBER
(Psi)
MINIMUM
PRESSURES
(Psi)
EXHIBIT C
FIRE FLOW ANALYSIS
* * * * * * * * * * K Y P I P E 5
* *
* Pipe Network Modeling Software
* *
* Copyrighted by KYPIPE LLC
* Version 5 - February 2010
* *
Date & Time: Wed Feb 27 16:52:02 2013
Master File : f:\1062 - clarke & wyndham inc\0031 - holleman - dartmouth
plat\docs\10620031-fire.KYP\10620031-fire.P2K
S U M M A R Y O F O R I G I N A L D A T A
U N I T S S P E C I F I E D
FLOWRATE ............ = gallons/minute
HEAD (HGL) .......... = feet
PRESSURE ............ = p5ig
P I P E L I N E D A T A
STATUS CODE: XX -CLOSED PIPE
CV -CHECK VALVE
P I
P E
NODE NAMES
LENGTH
DIAMETER
ROUGHNESS
MINOR
N A
M E
#1 #2
(ft)
(in)
COEFF.
LOSS COEFF.
-__-_
P-1
------------------------------------
VP-1 J-5
75.00
6.00
125.0000
0.00
P-2
J-3 J-1
100.00
8.00
125.0000
0.00
P-3
J-4 J-6
463.00
8.00
125.0000
0.00
P-4
J-2 VP-2
15.00
6.00
125.0000
0.00
P-5
13-1 J-2
437.00
8.00
125.0000
0.00
P-6
J-5 J-4
137.00
8.00
125.0000
0.00
P-7
J-6 J-3
253.00
8.00
125.0000
0.00
P U M
P/L 0 S S
E L E M E N T D A
T A
THERE
IS A DEVICE
AT NODE VP-1
DESCRIBED
BY THE FOLLOWING DATA: (ID= 1)
HEAD
FLOWRATE
EFFICIENCY
(£t)
(gpm)
M
258.46
0.00
75.00
235.38
1455.00
75.00
175.15
2910.00
75.00
THERE IS A DEVICE AT NODE VP-2 DESCRIBED BY THE FOLLOWING DATA: (ID= 2)
HEAD FLOWRATE EFFICIENCY
(ft) (gpm) M
249.23 0.00 75.00
230.77 1500.00 75.00
182.58 3000.00 75.00
N 0 D E D A T A
NODE
NODE
EXTERNAL
JUNCTION
EXTERNAL
NAME
TITLE
DEMAND
ELEVATION
GRADE
--------------------------------------------------------------
(gpm)
(£t)
(ft)
J-1
0.00
271.00
J-2
0.00
272.00
J-3
0.00
271.00
J-4
927.00
269.50
J-5
0.00
269.50
J-6
927.00
271.00
VP-1
----
270.00
270.00
VP-2
----
271.00
271.00
O U T P U T
O P T I O N
D A T A
OUTPUT SELECTION:
ALL RESULTS ARE INCLUDED
IN THE
TABULATED OUTPUT
MAXIMUM AND MINIMUM
PRESSURES
= 4
MAXIMUM
AND MINIMUM
VELOCITIES
= 4
MAXIMUM
AND MINIMUM
HEAD LOSS/1000
= 4
S Y S T E M
C O N F I G U
R A T I O N
NUMBER OF
PIPES ...................(p)
= 7
NUMBER OF
END NODES
=
NUMBER OF
PRIMARY LOOPS
...........(1)
= 0
NUMBER OF
SUPPLY NODES
............(f)
= 2
NUMBER OF
SUPPLY ZONES
............(z)
= 1
-------------------------------------------------------------------------------
--------------- - - - - - --------------------------------------
Case: 0
RESULTS OBTAINED AFTER 4 TRIALS: ACCURACY = 0.00000
S I M U L A T I O N D E S C R I P T I O N (L A B E L)
P I P E L I N E R E S U L T S
STATUS CODE: XX -CLOSED PIPE
P I P E NODE NUMBERS
N A M E #1 #2
(ft/ft)
----------------------------------
P-1
VP-1
J-5
P-2
J-3
J-1
P-3
J-4
J-6
P-4
J-2
VP-2
P-5
J-1
J-2
P-6
J-5
J-4
P-7
J-6
J-3
CV -CHECK VALVE
FLOWRATE
(gpm)
1085.95
-768.05
158.95
-766.05
-768.05
1085.95
-768.05
P U M P/L O S S E L E M E N T R E S U L T S
HEAD MINOR LINE HL+ML/ HL/
LOSS LOSS VELD. 1000 1000
(ft) (ft) (ft/s) (ft/ft)
----------------------------------
6.97 0.00 11.88 92.90 92.90
1.20 0.00 4.90 12.05 12.05
0.30 0.00 1.01 0.65 0.65
0.73 0.00 8.71 48.91 48.91
5.27 0.00 4.90 12.05 12.05
3.14 0.00 6.93 22.89 22.89
3.05 0.00 4.90 12.05 12.05
INLET
OUTLET
PUMP
EFFIC-
USEFUL
INCREMTL
TOTAL #PUMPS
#PUMPS NPSH
NAME
FLOWRATE
HEAD
HEAD
HEAD
ENCY
POWER
COST
COST
PARALLEL SERIES Avail.
(gpm)
(ft)
(ft)
(ft)
M
(Hp)
($)
($J
(ft)
---------------------------------------------------------------------------------------
-----------------
VP-1
1085.95
0.00
245.04
245.0
75.00
0.
0.0
0.0 **
** 33.2
VP-2
768.05
0.00
243.89
243.9
75.00
0.
0.0
0.0 **
** 33.2
N 0 D E R E S U L T S
NODE NODE
NAME TITLE
J-1
J-2
J-3
J-4
J-5
J-6
VP-1
VP-2
EXTERNAL
HYDRAULIC
NODE
PRESSURE
NODE
DEMAND
GRADE
ELEVATION
HEAD
PRESSURE
(gpm)
(ft)
(ft)
(ft)
(psi)
------------------------------------------------
0.00
508.89
271.00
237.89
103.08
0.00
514.15
272.00
242.15
104.93
0.00
507.68
271.00
236.68
102.56
927.00
504.94
269.50
235.44
102.02
0.00
508.07
269.50
238.57
103.38
927.00
504.63
271.00
233.63
101.24
----
515.04
270.00
245.04
106.18
----
514.89
271.00
243.99
105.68
M A X I M U M A N D M I N I M U M V A L U E S
P R E S S U R E S
JUNCTION MAXIMUM JUNCTION
NUMBER PRESSURES NUMBER
(psi)
MINIMUM
PRESSURES
(psi)
VP-1
106.18
J-6
101.24
VP-2
105.68
J-4
102.02
J-2
104.93
J-3
102.56
J-5
103.38
J-1
103.08
V E L O C I T
I E S
PIPE
MAXIMUM
PIPE
MINIMUM
NUMBER
VELOCITY
NUMBER
VELOCITY
---------------------
(ft/s)
(£t/s)
P-1
12.32
__-_--------------__-
P-3
1.01
P-4
8.71
P-2
4.90
P-6
6.93
P-5
4.90
P-7
4.90
P-7
4.90
H L+ M L /
1 0 0 0
PIPE
MAXIMUM
PIPE
MINIMUM
NUMBER
HL+ML/1000
NUMBER
HL+ML/1000
---------------------
(ft/ft)
______
(ft/ft)
P-1
92.90
P-3
0.65
P-4
48.91
P-2
12.05
P-6
22.89
P-5
12.05
P-7
12.05
P-7
12.05
H L / 1 0 0
0
PIPE
MAXIMUM
PIPE
MINIMUM
NUMBER
HL/1000
NUMBER
HL/1000
(ft/ft)
_----___--__---------
(ft/ft)
---------------------
P-1
92.90
P-3
0.65
P-4
48.91
P-2
12.05
P-6
22.89
P-5
12.05
P-7
12.05
P-7
12.05
S U
M M A R Y O
F I N F L O W
S A
N D O U T
F L O W S
(+)
INFLOWS INTO THE SYSTEM FROM
SUPPLY
NODES
(-)
OUTFLOWS FROM
THE SYSTEM INTO
SUPPLY NODES
NODE
FLOWRATE
NODE
NAME
(gpm)
TITLE
--------------------------------------------
VP-1
1085.95
VP-2
768.05
NET
SYSTEM INFLOW
= 1854.00
NET
SYSTEM OUTFLOW = 0.00
NET
SYSTEM DEMAND
= 1854.00
***** HYDRAULIC ANALYSIS COMPLETED *****
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Drainage Report
FOR
Falcon Point Condos
SITE PLAN
College Station, Texas
NOVEMBER 2012
MBESI# 1000-0243
SUBMITTED BY:
rm
McCLURE & BROWNE, ENGINEERING/SURVEYING, INC.
1008 Woodcreek Dr., Suite 103 College Station. Tx. 77845 - (979) 693-3838 Engineer Reg. No. F-458
1314 10th Street, Suite 210 Huntsville, Tx. 77320 - (936) 204-9749 Survey Reg. No. 101033-00
Falcon Point Condos
Stormwater
Management Technical Design Summary Report
MBESINo. 1000-0243
PART 1— Executive Sum
mUIXRep
ort
Section 1 — Contact
Information
Project Designer: McClure and Browne Engineering and Surveying, Inc.
1008 Woodcreek Drive, Suite 103
College Station, TX 77845
979-693-3838
Project Developer: Scott Ball
College Station, TX 77845
(979)774-5777
Section 2 — General Information and Project Location
This development is a proposed condominium
vIng two buildings and the associated
Smoking and utility improvements. The development is entirely located within the city limits of College
The project site is in the Wolf Pen Creek watershed.
Brazos County, Texas and into According to the Flood Insurance Rate Maps for
Portion of this roe rporated area, Map Number 48041CO205E effective May at
Property rty is located in a 100-year flood hazard area. Y , 2012; no
Section 3 — Reference
Exhibit A Technical Design Summary
Exhibit B Drainage Area Map
Exhibit C HEC-HMS Results
Exhibit D Culvert Analysis
. 1dge report
Falcon Point Condos
EXHIBITS
Drainage Report
Falcon Point Condos
EXHIBIT A
Technical Design Summary
Drainage Report
Falcon Point Condos
VG<r1IVIY IA
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
MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT
rAL L — A curve summary
This is to V a brief prose report that must address each of the seven areas listed below.
all 't-nGill include one or more paragraphs about each item.
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
STORMWATER DESIGN GUIDELINES Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
APPENDIX D — TECHNICAL DESIGN SUMMARY
applications that are in process with either City: plat(s), site plans, zoning requests,
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.
15. j The general plan for managing stormwater in the entire project area must be
outlines ro cue a 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;
ouffalls 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.
U
eference is to be made to the full drainage report (or the Technical Design
ummary Report) which the executive summary represents. The principal
ements 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 August 20122012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Administration
Start (Page 2.1)Engineering
and DesignProfessionals Information
r-Pro"ectject
rm Name and Address:
&2vuAe �^glolefIv tg��RVryfv�g
Jurisdiction
City: Bryan
Yer 14f I0.3
College Station
i1oN �i( 7-f $ 415
Date of Submittal:
Lead Engineer's Name and Contact Info.(p�hone, e-mail, fax):
Other:
Q;P,P- G. I��EQ�s�. f�TY eMct�u/{D�wil<.fo
Supporting Engineering / Consulting Firm(s):
Other contacts:
Developer / Owner / Applicant Information
Devello�per / Applicant Name and Address:
Phone and e-mail:
/
Property Owner(s) if not Developer / Applicant (& address):
Phone and a -mail:
�A'Kc QS OWA<r
Project Identification
Development Name: FA6^ pjrit 64og
Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision?
S�+e
If multi -phase, subject property is phase of
Legal description of subject property (phase) or Project Area:
(see Section II, Paragraph B-3a)
�Es (-z , 6 �rl�o� por„+ s-jl�(,�,5,0,�
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.
General Location of Project Area, or subject property (phase):
Nekf-
lAet Seakvt tF 9dtfe.St'1n De.
In City Limits?
Extraterritorial Jurisdiction (acreage):
Bryan: acres.
Bryan: College Station:
College Station: I.Sf acres.
Acreage Outside ETJ:
STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Continued (page 2.2)
Project Identification (continued)
Roadways abutting or within Project Area or
Abutting tracts, platted land, or built
subjectproperty:
DA4moJ� V ve
developments: _ J
drr /fvi lO/
tj"� ck
Named Regulatory Watercours s) & atersheTWZk
Tributary
Geek
UntutMe� `rR� b W o l l�W
Plat Information For Project or Subject Property (or Phase)
Preliminary Plat File #:
Final Plat File #: %i CbS47 Date: o 17
Name:
Status and Vol/Pg: �jn 7� 7
If two plats, second name: File #:
Status:
Date:
Zoning Information For Project or Subject Property (or Phase)
Zoning Type: �� xisting r Proposed? 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) :
Participants:
11-1IM1
Preliminary Report Required? Submittal Date 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 JA
STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX, D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Continued (page 2.3)
Coordination For Projector Subject Property (or Phase)
Note: For any Coordination of stormwater matters indicated below, attach documentation
describing and substantiating any agreements, understandings, contracts, or approvals.
Dept.
Contact:
Date:
Subject:
Coordination
With Other
Departments of
Jurisdiction
City (Bryan or
College Station)
Coordination With
Summarize need(s) & actions taken (include contacts & dates):
Non jurisdiction
City Needed?
Yes —No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
Brazos County
Needed?
Yes No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates).
TxDOT Needed?
Yes No %
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
TAMUS Needed?
Yes_ Now
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 ins aces below.
Entity
Permitted or
Approved ?
Status of Actions include dates
( )
US Army Crops of
Engineers
No _� Yes_
US Environmental
Protection Agency
No X Yes _
Texas Commission on
Environmental Quality
No X Yes
Brazos River
Authority
No X Yes
STORMWATER DESIGN
Effective February 2007
Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
Start (Page 3.1)
Nature and Scope of Proposed Work
Existing: an proposed for development currently used, including extent of impervious cover?
O tV,ri LAAd
Site
_ Redevelopment of one platted lot, or two or more adjoining latted lots.
Development
_ Building on a single Platted lot of undeveloped land.
Project
_K Building on two or more glatted adjoining lots of undeveloped land.
(select all
applicable)
g lot, or ad 9
g on a Building single adjoining lots, where proposed plat will not form
a new street (but may include ROW dedication to existing streets).
— Other (explain):
Subdivision
— Construction of streets and utilities to serve one or more Platted lots.
Development
Project
_ Construction of streets and utilities to serve one or more proposed lots on
lands represented by pending plats.
Describe
Site projects: building use(s), approximate floor space, impervious cover ratio.
Subdivisions: number of lots by general type of use, linear feet of streets and
Nature and
drainage easements or ROW.
Size of
Z (;OA8 �V1l �f J " � 'dc-
Proposed
1
Project
SO, t3$ Sr- Tjo�? =6zre
Is any work planned on land that is not platted
If yes, explain:
or on land for which platting is not pending?
No _Yes
FEMA Floodplains
Is any part of subject property abutting a Named Regulatory Watercourse
(Section ll, Paragraph B1) or a tributary thereof?
No � Yes
Is any part of subject property in floodplain
area of a FEMA-regulated watercourse?
No_ Yes_ Rate Map
Encroachments)
into F000dplain
Encroachment purpose(s): — Building site(s) — Road crossing(s)
s
g( )
areas planned?
— Utility crossing(s) — Other (explain):
No
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.
STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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 management plan for the property in substantial conformance with the
earlier study? Yes No If not, explain how it differs.
No
If subject property is not part of multi -phase project, describe stormwater management
for the
X
plan 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.
Do existing topographic features on subject property store or detain runoff?
Describe them (include approximate size, volume, outfall, model, etc).
Any known drainage or flooding problems in areas near subject property? _ X No Yes
Identify:
Based on location of study property in a watershed, is Type 1 Detention (flood control) needed?
(see Table B-1in Appendix B)
Detention is required. _ Need must be evaluated. Detention not required.
What decision has been reached? By whom?
If the need for
Type 1 Detention
How was determination made?
must be evaluated:
STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
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? �_ No _ Yes If yes,
describe splits below. In Part 4 describe design concept for handlin 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? _ No X Yes
Size(s) of area(s) in acres: 1) 1. 1 2) 3) 4)
Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable
concentrated section(s), smalljcreek (non -regulatory), regulatory Watercourse or tributary);
Flow determination: Outline hydrologic methods and assumptions:
�jc5 Meitn.� �/ �kEC—t'E�tS s�H.rnRC
Uv LRgS bJ ARAD' ll� ISO GiriaiCA s
Does storm runoff drain from public easements or ROW onto or across subject property?
No K Yes If yes, describe facilities facilities in easement or ROW:
CuIVINt
Are changes in runoff characteristics subject to change in future? Explain
ti� � Alr�,�•� deu��p�d s►"f{
Conveyance Pathways (Section II, Paragraph C2)
Must runoff from study property drain across lower properties before reaching a Regulatory
Watercourse or tributary? No Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies).
STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
AVA-rv" VIAMK
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
F Continued (Page 3.4)
Hydrologic Attributes of Subject Property (or Phase) (continued)
Conveyance Pathways (continued)
Do drainage
If yes, for what part of length? % Created by? plat, or
easements
_
instrument. If instrument(s), describe their provisions.
exist for any
part of
pathway(s)?
_ No
Yes
Where runoff must cross lower properties, describe characteristics of abutting lower
property(ies). (Existing watercourses? Easement or Consent aquired?)
Pathway
Areas
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, lined channels, buried conduit, swales, detention ponds, etc).
y16
Nearby
Drainage
Facilities
Do any of these have hydrologic or hydraulic influence on proposed stormwater
design? _ No Yes If yes, explain:
STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Start (Page 4.1)
Stormwater Management Concept
Discharge(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.
wit( he atuAuusj 4ei �y .iZk-il-e 6x?&i*ean
ttq- A6, kmt5rk
2� Ih- QRopsel 42"eu(vcsf Tw fit, 45AW-e 6yA w,IIensvRe
. 6w is rs64 �JeA ro(.
Discharge(s) To Lower Property(ies) (Section II, Paragraph E1)
Does project inc ude drainage features (existing orfuture) proposed to become public via
platting? No Yes Separate Instrument? No Yes
Per Guidelines reference above, how will
runoff be discharged to neighboring
Establishing Easements (Scenario 1)
property(ies)?
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 #_)
Ctk ,1145 hgVf- 6«^ show.
Scenario 2: Provide general description of how release(s) will be managed to pre -development
conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit #�
ombinatio If combination is proposed, explain how discharge will differ from pre
dq�elo nt conditions at the property line for each area (or point) of release.
— !EkSLW+Pn"r
IIf Scenario 2 or Combination are to be used, has proposed design been coordinated with
o er(s) eceiving property(ies)? No _ Yes Explain and provide
documentation.
STORMWATER DESIGN GUIDELINES Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept (continued)
Within Project Area Of Multi -Phase Project
Identify gaining Basins or Watersheds and acres shifting:
Will project result
in shifting runoff
between Basins or
between
What design and mitigation is used to compensate for increased runoff
Watersheds?
from gaining basin or watershed?
No
Yes
How will runoff from Project
1. facility(ies) involving other development projects.
Area be mitigated to pre-
development conditions?
_With
2 Establishing features to serve overall Project Area.
—
Select any or all of 1, 2,
3. On phase (or site) project basis within Project Area.
and/or 3, and explain below.
—
{ �C„�eA net" r<104'JACt
1. Shared facility (type & location of facility; design drainage area served; relationship to size of
Project Area): (Attached Exhibit #_)
2. For Overall Project Area (type & location of facilities): (Attached Exhibit #_)
3. By phase for site) project: Describe planned mitigation measures for phases (or sites) in
subsequent questions of this Part.
Are aquatic echosystems proposed? — No — Yes In which phase(s) or
project(s)?
r.
-o
r
Are other Best Management Practices for reducing stormwater pollutants proposed?
a-
No Yes Summarize type of BMP and extent of use:
w
c
O)
N O
0 Z
g
If design of any runoff -handling facilities deviate from provisions of B-CS Technical
con 1�
Specifications, check type facility(ies) and explain in later questions.
I
_ Detention elements _ Conduit elements — Channel features
Swales _ Ditches _ Inlets _ Valley gutters _ Outfalls
Culvert features Bridges Other
STORMWATER DESIGN GUIDELINES Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.3)
Stormwater 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 project (physical location, conveyance pathway(s), construction sequence):
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 0 No, then summarize the difference(s):
I�
Identify whether each of the types of drainage features listed below are included, extent of use,
and general characteristics.
Typical shape?
Surfaces?
C•
v
m
Steepest side slopes:
Usual front slopes:
Usual back slopes:
m }
Flow line slopes: least
Typical distance from travelway:
typical greatest
(Attached Exhibit # )
o
y Z
v
m
° x
Are longitudinal culvert ends in compliance with B-CS Standard Specifications?
Yes No, then explain:
y
At intersections or otherwise, do valley gutters cross arterial or collector streets?
c. }
No _ Yes If yes explain:
U �
t
W
NAre
valley gutters proposed to cross any street away from an intersection?
rn z°
No Yes Explain: (number of locations?)
m c
d �
STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
- SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.4)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Gutter line slopes: Least Usual Greatest
Are inlets recessed on arterial and collector streets? No If "no",
—Yes
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.
a
m
Will inlet size and placement prevent exceeding allowable water spread for 10-year
5
design storm throughout site (or phase)? _ Yes _ No If no, explain.
rn
a
Sag curves: Are inlets placed at low points? No Are inlets and
_Yes
conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches?
t
_ Yes No Explain "no" answers.
N
(D
N
N
a)
Will 100-yr stormflow be contained in combination of ROW and buried conduit on
4
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.
Are any 12-inch laterals used? No _ Yes Identify length(s) and where
used.
my
Pipe runs between system
Typical Longest
}
access points (feet):
Are junction boxes used at each bend? —Yes No If not, explain where
N
and why.
C
O
Z
L
E
y
Are downstream soffits at or below upstream soffits?
Least amount that hydraulic
w
Yes No If not, explain where and why:
grade line is below gutter line
(system -wide):
STORMWATER DESIGN GUIDELINES Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 —Drainage Concept and Design Parameters
Continued (Page 4.5)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Describe watercourse(s), or system(s) receiving system discharge(s) below
(include design discharge velocity, and angle between converging flow lines).
`m
1) Watercourse (or system), velocity, and angle?
N
C
— O
E
2) Watercourse (or system), velocity, and angle?
c
.0
O
v C
aa)i E
v
3) Watercourse (or system), velocity, and angle?
T
�a
O
12 2
o `o_
E
For each outfall above, what measures are taken to prevent erosion or scour of
yreceiving
and all facilities at juncture?
�
1)
m
`a
a
2)
0
3)
Are swale(s) situated along property lines between properties? No Yes
Number of instances: For each instance answer the following questions.
Surface treatments (including low -flow flumes if any):
h
N
N
iV
N
N }
c
Flow line slopes (minimum and maximum):
m
v
0
d o
Z
N
3
m
Outfall characteristics for each (velocity, convergent angle, & end treatment).
Q
Will 100-year design storm runoff be contained within easement(s) or platted drainage
ROW in all instances? —Yes —No If "no" explain:
STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
- SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.6)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Are roadside ditches used? No Yes If so, provide the following:
rIs
_
25-year flow contained with 6 inches of freeboard throughout ? Yes No
w
_ _
Are top of banks separated from road shoulders 2 feet or more? Yes No
�
_ _
trapezoidal and at least 1.5 feet deep? _
Are all ditch sections tP� Yes No
P
N
For any "no" answers provide location(s) and explain:
v
0
0
o:
If conduit is beneath a swale, provide the following information (each instance).
Instance 1 Describe general location, approximate length:
N
>
Is 100-year design flow contained in conduit/swale combination? _ Yes No
m
_
If "no" explain:
m
U
0 m
Space for 100-year storm flow? ROW _ Easement _ Width
Z E
Swale Surface type, minimum
Conduit Type and size, minimum and maximum
X �
and maximum slopes:
slopes, design storm:
0
N �
c m
Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type):
c a
c
ca
t
U `0
0 o
Access Describe how maintenance access is provided (to swale, into conduit):
o m
om
�
,Y
Instance 2 Describe general location, approximate length:
N y
J
c
Is 100-year design flow contained in conduit/swale combination? Yes No
'o
_ _
If "no" explain:
c n
E 0;
Space for 1 DO -year storm flow? ROW Easement Width
U N
Swale Surface type, minimum
Conduit Type and size, minimum and maximum
-0 %
and maximum slopes:
slopes, design storm:
o d
Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type):
d
m
3 0
N
2
Access Describe how maintenance access is provided (to swale, into conduit):
STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desian Parameters
I Continued (Page 4.7)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
If "yes" provide the following information for each instance:
Instance 1 Describe general location, approximate length, surfacing:
c
n
o W
2
4g v;
Is 100-year design flow contained in swale? Yes _ No Is swale wholly
}
within drainage ROW? Yes No Explain "no" answers:
_
m
dAccess
Describe how maintenance access is provide:
o
�z
0
U
v
Instance 2 Describe general location, approximate length, surfacing:
c cam.
Y
a c
a)'o E
r a
.3 m
Is 100-year design flow contained in swale? _ Yes _ No Is swale wholly
°'
`o
within drainage ROW? Yes No Explain "no" answers:
_
_ _
y O
W
Access Describe how maintenance access is provided:
_U
C
d
Instance 3. 4. etc. If swales are used in more than two instances, attach sheet
providing all above information for each instance.
"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
o a
describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year
o
design flow, and amount of freeboard:
fl
N �
Instance 1:
C }
CN
C
1
o
Instance 2:
a
E �
— z
�
Instance 3:
m
U
STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.8)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Existing channels (small creeks): Are these used? _ No Yes
If' es" 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.
9
am
c
oWatercourses
(and tributaries): Aside from fringe changes, are Regulatory
v
Watercourses proposed to be altered? No Yes Explain below.
_
Submit full report describing proposed changes to Regulatory Watercourses. Address
E
existing and proposed section size and shape, surfaces, alignment, flow line changes,
length affected, and capacity, and provide full documentation of analysis procedures
°
and data. Is full report submitted? Yes No If "no" explain:
a
E
m
c
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 maintenance space?
Yes _ No If not, identify location(s) and explain:
STORMWATER DESIGN GUIDELINES Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.9)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
How many facilities for subject property project? For each provide info. below.
For each dry -type facilitiy:
Facility 1
Facility 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:
r
For each facility what is 25-yr design Q, and design of outlet structure?
Facility 1:
0
z,
Facility 2:
`X1I�
Do outlets and spillways discharge into a public facility in easement or ROW?
Facility 1: —Yes —No Facility 2: —Yes —No
If "no" explain:
0
0
o.
0
IL
For each, what is velocity of 25-yr design discharge at outlet? & at s ilo Iwav?
+„
Facility 1: & Facility 2: &
Are energy dissipation measures used? No _ Yes Describe type and
L-
location:
0
.c
m
d
P
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
1
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:
STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.10)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Do structures comply with B-CS Specifications? Yes or no, and explain if "no":
Facility 1;
d
LL d
Facility 2:
o c
C V
oFor
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?
Roadside Ditches: Will culverts serve access driveways at roadside ditches?
_X- 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:
N
O)
C_
m
2
Are culverts parallel to public roadway alignment? Yes No Explain:
U �
$ I
Creeks at Private Drives: Do private driveways, drives, or streets cross drainage
m
ways that serve Above -Project areas or are in public easements/ ROW?
Nzo
_ No X Yes If "yes" provide information below.
N
location and provide information below.
How many instances? + Describe location
If
Location 1: 1f2` lzcf t t'Mp aT -54e
U
2!T
µpPi � bul(4►:�g
Location 2:
Location 3:
For each location enter value for:
1
2
3
Design year passing without toping travelway?
1p0
Water depth on travelway at 25-year flow9
a
p
Water depth on travelway at 100-year flow?
O
For more instances describe location and same information on separate sheet.
STORMWATER DESIGN GUIDELINES Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.11)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
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 Maior Collector Streets: Will culverts serve these types of roadways?
wNo
Yes How many instances? For each identify the
location and provide the information below.
} 20
Instance 1:
a
N
Instance 2:
c
0
Instance 3:
c
0
0
Yes or No for the 100-year design flow:
1
2
3
o
Headwater WSE 1 foot below lowest curb top?
ESpread
of headwater within ROW or easement?
rn N
Is velocity limited per conditions (Table C-11)?
m
Explain any "no" answer(s):
o c
0.0
> (6
(6 U
3 0
a 0
0 9
Minor Collector or Local Streets: Will culverts serve these types of streets?
No Yes How many instances? for each identify the
o
location and provide the information below:
.nT
Instance 1:
Instance 2:
� m
W o
Instance 3:
� 0
a�
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?
E
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:
STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside
ditch intersects) provide information requested in next eight boxes.
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 culvert and surfaced
approaches thereto? No _ Yes If "yes" identify location(s), 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 to culvert ends?
No _ Yes If "yes" identify location(s), describe outfall design treatment(s):
C
C
O
U
N
Is scour/erosion protection provided to ensure long term stability of culvert structural
�j
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 street ROW, and/or
drainage easements/ ROW? _ Yes _ No if not, why not?
Do appreciable hydraulic effects of any culvert extend downstream or upstream to
neighboring land(s) not encompassed in subject property? _ No Yes If
'yes' describe location(s) and mitigation measures:
Are all culvert designs and materials in compliance with B-CS Tech. Specifications?
Yes _ No If not, explain in Special Design Section of this Part.
STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.13)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Is a bridge included in plans for subject property project? _ No _ Yes
If "yes" provide the following information.
Name(s) and functional classification of the roadway(s)?
What drainage way(s) is to be crossed?
N
a)
OI
m
A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical,
hydrologic, and hydraulic factors) must accompany this summary report. Is the report
provided? —Yes —No If "no" explain:
w
Is a Stonnwater
Pollution Prevention
Provide a general description of planned techniques:
bt Lt. Pe5rD44r �'�
5W`PPP
a
Plan (SW3P)
established for
Will
<roS1a^ �°n+ro �dPh
�l
a`r
project construction?
h 1n�'/r��rt<
� No _Yes
h�S pr�vrdtd 4 f1w- 5talp
Special Designs — Non -Traditional Methods
Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream
replication, BMPs for water quality, etc.) proposed for any aspect of subject property project?
4 No _ Yes If "yes" list general type and location below.
Provide full report about the proposed special design(s) including rationale for use and
expected benefits. Report must substantiate that stormwater management objectives will not
be compromised, and that maintenance cost will not exceed those of traditional design
solution(s). Is report provided? —Yes —No If "no" explain:
STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
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
Is a map(s) showing all Design Drainage Areas provided? ii Yes No
Briefly summarize the range of applications made of the Rational Formula:
msat
What is the size and location of largest Design Drainage Area to which the Rational Formula
has been applied? acres Location (or identifier):
STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
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 _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?_ 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
A
Swale/buried conduit combination in lieu of channel
Pik
Swales
S s 7-5 ise
5 b 2-5
Roadside ditches and culverts serving them
N A
Detention facilities: spillway crest and its outfall
Detention facilities: outlet and conveyance structure(s)
p
Detention facilities: volume when outlet plugged
Culverts serving private drives or streets
S ie 26 SO �tlp
z� po
Culverts serving public roadways
NlA
Bridges: provide in bridge report.
N A
Hydraulics
What is the range of design flow velocities as outlined below?
Design flow velocities;
Gutters
Conduit
Culverts
Swales
Channels
Highest (feet per second)
y, 1
Lowest (feet per second)
A.I
Z•1
Streets and Storm Drain Systems Provide the summary information outlined below:
Roughness coefficients used: For street gutters:
For conduittype(s) 0•19/ DJ,( Coefficients:
STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
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? Af Yes _ No
Are elevation drops provided at inlets, manholes, and junction boxes? —Yes —No
Explain any "no" answers: A I A
Are hydraulic grade lines calculated and shown for design storm? 'K Yes _ No
For 100-year flow conditions? -)(--Yes —No Explain any "no" answers:
What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify
each location and explain: 41cp�t�l 'i *PM �C� rollt d oA r�eF
U„s, smlicn
Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? es —Noy
Outside of straight sections, is flow regime within limits of sub-crifical flow? _ Yes _ No
If "no" list locations and explain:
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?
TTIct
Entrance, friction and exit losses:
,q,+. or
i•25,
Bridges Provide all in bridge report
STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
/A
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desian 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
,&,,I 5�e,�oiikPe`F — Cvruer 4M[YSi6
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 Part B was prepared
by me (or under my supervision) in accordance with provisions of the Bryan/College Station
Unified Drainage Design Guidelines for the owners of the property. All licenses and permits
required by any and all state and federal regulatory agencies for the proposed drainage
improvements have been issued or fall under applicable general permits."
(Affix Seal)
h/� ,• 11I�Z �12 y,. ,
Licens ssional Engineer
a �74
State of Texas PE No
STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
EXHIBIT B
Drainage Area Map
Drainage Report
Falcon Point Condos
EXHIBIT B-1
DRAINAGE AREA MAP
FALCON POINT CONDOS
COLLEGE STA7701V BR4ZOS COUNTY, TEXAS
M0CLURE & BROWNE e MY, ERlN6/SUon, 7XNG, INC.
(979 Wboo'creek9,5-3 3 On a Suite /OJ, -255College SCofio2 7X 77845
(979) 693-JBJB Fora (979) 69J-7554
I== — ay u _ "se
100 M-DM
EXHIBIT C
HEC-HMS Results
Drainage Report
Falcon Point Condos
5 YEAR
73 Global Summary Results for Run '5 Year"
Project: FALCON Simulation Run: 5 Year
Start of Run: 011un2007, 00:00 Basin Model: Falcon Point
End of Run: 02Jun2007,00:30 Meteorologic Model: 5Year
Compute Time::. 13Nov2012, 10:51:58 Control Specifications: Control 1
Show Elements: WI Elements Volume Units. Ian IN -FT (HHydrol�ogic
Hydrologic Drainage Area Peak Discharge Time of Peak Volume
Element (MI2) (CFS} ON)
3 — - — -- 0.0703 - _. - 62.6 1011un2007, 13.20 4.92
10 YEAR
,113 Global Summary Results for Run "10 Year" a�
Project: FALCON Simulation Run: 10 Year
Start of Run: 013un2007, 00:00 Basin Model: Falcon Point
End of Run: 021un2007, 00:30 Meteorologic Model: 10 Year
Compute Time: 13Nov2012, 10:52:13 Control Specifications: Control 1
Show Elements: All Elements �_� Volume Units: k4,) IN !_j AC -FT Sorting: j Hydrologic
Hydrologic Drainage Area Peak Discharge Time of Peak Volume
9 9
Element (MI2) (CFS) (IN)
9 0.0703 77,1 1013un2007, 13:20 1 6.06
25 YEAR
175 Global Summary Resuftsfor Run "25 Year" I o f
Project: FALCON Simulation Run: 25 Year
Start of Run: 011un2007, 00:00 Basin Model; Falcon Point
End of Run;: 02jun2007, 00:3o Meteorologic Model: 25 Year
Compute Time: 13Nov2012, 10:52:08 Control Specifications: Control 1
Show Elements: All Elements Volume Units: (u) IN (:) AC -Fr Sorting; Hydrologic .
Hydrologic i Drainage Area Peak Discharge Time of Peak Volume
Element II (MII2) (CFS)
7 0.0703 89.2 JU1Jun2007, Li:20 1 7.01
50 YEAR
FU Global Summary Results for Run "50 Year"
Project: FALCON Simulation Run: 50 Year
Start of Run: 013un2O07, 00:00 Basin Model; Falcon Point
End of Run; 073un2007, 00:30 Meteorologic Model: 50 Year
Compute Time; 13Nov2012, 10:52:04 Control Speafications;. Control i
Show Elements: All Elements .z l Volume Units: r4,1 IN (_; AC -FT Sarong; Hydrolpgic
Hydrologic Drainage Area Peak DischargelofPeakTime Volume
Element (MI2} (CFS) {IN)
3 1 M0703 1 106.1 013un2007, 13:20 8.36
100 YEAR
Global Summary Resultsfor Run 100 Year"—!
Project: FALCON Simulation Run: 100 Year
StartofRun: o17un2007,00:00 Basin Model: Falcon Point
End of Run: 027un2007, 00:30 Meteorologic Model: 100 Year
Compute Time: 13NoV2012, 10:25:57 Control SPedfications: Control 1
Show Elements: iAll Elements Volume Unitw (q) IN AC -FT 50f5no: 1 Hvrirnlnnir _
Hydrologic Drainage Area PeakDischarge Time of Peak Volume
Element {MI2j (CFS) �N)
Existing 0.0703 - 120.6 011un2007, 13:20 9.53
EXHIBIT D
Culvert Analysis
Drainage Report
Falcon Point Condos
J
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