HomeMy WebLinkAboutExecutive Summary Report (4/16/2010)April 16, 2010
Erika Bridges, E.I.T.
Planning and Development Services
City of College Station
P 0 Box 9960
College Station, TX 77842
RE: Executive Summary Report
Entergy Site Plan
Dear Erika,
As required by the City of College Station, Bleyl and Associates has prepared a
Stormwater Management Technical Design Summary Report for submission and review
for the referenced project. This report includes the Executive Summary Report, a
completed Technical Design Summary, and other reference material needed for your
review.
CONTACT INFORMATION
Project Engineering & Management
1. ENGINEER:
Mark A. Savarino, P.E.
Bleyl & Associates
1722 Broadmoor Drive
Suite 210
Bryan, Texas 77802
2. OWNER:
Charles Eric Jones
10998 Nunn Jones Rd
College Station, Texas 77845
3. SUBMITTAL DATE:
April 19, 2010 (2 Submittal)
GENERAL PROJECT INFORMATION
Bleyl & Associates
The owner wishes to build an electrical switch station for Entergy, Inc. as well as
associated improvements including a crushed limestone base driveway and
landscaping. The property is 16.615 acres however the proposed improvements will
affect approximately 3.96 acres of the property. There are no additional phases
planned.
1722 Broadmoor
Suite 210
Bryan, TX 77802
Bryan Austin Conroe
(979)- 268 -1125 (512)- 328 -7878 (936)- 441 -7833
(979)- 260 -3849 (512)- 328 -7884 Fax (936)- 760 -3833 Fax
PROJECT LOCATION
The proposed 16.615 acre project site is located on Switch Station Rd. approximately
1,000 feet northeast of the intersection of Appomattox Dr. and Switch Station Rd.
The entire property falls within the city limits of College Station.
The property is within the Carter's Creek Watershed. The northeastern property line of
the tract is approximately 700 feet west of Carter's Creek. Because of its proximity to a
primary channel, no detention is proposed. Due to the project being constructed within
the floodplain, a No Adverse Impact Study has been completed for the site by Mitchell
and Morgan. The study is provided under a separate cover.
HYDROLOGIC CHARACTERISTICS
Land cover on the property is mostly a dense Buffalo or prairie grass with a few
scattered trees. The western side of the site is approximately sixteen feet higher than
the eastern half and allows for existing runoff to sheet flow from west to east in a shallow
concentrated manner. This flow crosses the neighboring tract to the east currently
owned by the developer of this property.
The subject property is bounded by a 77 acre tract owned by Richard Smith to the
northwest, a 22 acre tract owned by Carl and Jeannie Kolbe to the southeast, a 2 acre
tract owned by Oakwood Custom Homes to the south, and the existing City of College
Station Switch Station to the southwest. Of these areas, runoff on site is generally
received from the existing switch station site and the Richard Smith site and sheet flows
in an easterly direction before exiting the site and entering Carter's Creek.
This project will entail the construction of an approximate 2.48 acre limestone rock pad
and switch station over the existing prairie grass surface as well as filling in an existing
watering tank used for cattle. These will be the basis of the post developed flow
calculations.
STORMWATER MANAGEMENT
Due to the proximity of the site to Carter's Creek, no detention of runoff is requested for
this site. Based on this request, our stormwater plan is to essentially convey runoff
across the developed site in a sheet flow / shallow concentrated manner and, after
exiting the developed area, allow it to continue to be conveyed as was originally
occurring. After flowing across the downstream property, the stormwater will enter
Carter's Creek to the east.
Pre- and post - developed flow rates have been calculated using initial assumptions which
include runoff efficients of 0.33 for unimproved pasture land and manicured grass land
(park) (low range for average slopes), 1.0 for impervious pond areas, and 0.40 for the
limestone rock used to create the pad for the switch station site. Time of concentration
calculations are based on segment analysis.
Based on these considerations, the pre - developed and post - developed discharge rates
are estimated as follows:
Due to the slight increase in flow in the post developed conditions, we request the direct
conveyance of this stormwater.
Also, as previously mentioned, because of the proximity of the site to Carter's Creek and
being inside of the creek's floodplain limits, a No Adverse Impact Study has been
prepared by Mitchell and Morgan. Within this study, it was concluded that, with the use
of the proposed compensatory storage provided to the northeast of the pad, the filling
within the floodplain to construct the pad will not adversely impact the downstream base
flood elevation.
REFERENCE
This Summary Report, a one 26 -page design summary dated April 16, 2010, and
additional exhibits comprise the drainage report for this project. A copy of the Mitchell
and Morgan "No Adverse Impact" Study is provided under a separate cover.
Please contact me with any questions, or if you require any additional information to
complete your technical review of this project.
Sincerely,
Mark Savarino, P.E.
Project Manager
Pre (cfs)
02 10.45
Q10 14.80
Q25 16.99
Q50 19.31
0100 20.17
.T , N 1 l
*. ' *
MARK A. SAVARINO
105149 1 z, i
S /ONAt -tom
Post (cfs)
10.82
15.29
17.56
19.96
20.84
EXHIBIT A
TECHNICAL DESIGN SUMMARY
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
The Cities of Bryan and College Station both require storm drainage design to follow these
Unified Stormwater Design Guidelines. Paragraph C2 of Section III (Administration) requires
submittal of a drainage report in support of the drainage plan (stormwater management plan)
proposed in connection with land development projects. both site projects and subdivisions.
That report may be submitted as a traditional prose report, complete with applicable maps,
graphs, tables and drawings, or it may take the form of a "Technical Design Summary ". The
format and content for such a summary report shall be in substantial conformance with the
description in this Appendix to those Guidelines. In either format the report must answer the
questions (affirmative or negative) and provide, at minimum, the information prescribed in the
"Technical Design Summary" in this Appendix.
The Stormwater Management Technical Design Summary Report shall include several parts
as listed below. The information called for in each part must be provided as applicable. In
addition to the requirements for the Executive Summary, this Appendix includes several
pages detailing the requirements for a Technical Design Summary Report as forms to be
completed. These are provided so that they may be copied and completed or scanned and
digitized. In addition, electronic versions of the report forms may be obtained from the City.
Requirements for the means (medium) of submittal are the same as for a conventional report
as detailed in Section HI of these Guidelines.
Note: Part 1 — Executive Summary must accompany any drainage report
required to be provided in connection with any land development project,
regardless of the format chosen for said report.
Note: Parts 2 through 6 are to be provided via the forms provided in this
Appendix. Brief statements should be included in the forms as requested,
but additional information should be attached as necessary.
Part 1 — Executive Summary Report
Part 2 — Project Administration
Part 3 — Project Characteristics
Part 4 — Drainage Concept and Design Parameters
Part 5 — Plans and Specifications
Part 6 — Conclusions and Attestation
STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT
Part 1 — Executive Summary
This is to be a brief prose report that must address each of the seven areas listed below.
Ideally it will include one or more paragraphs about each item.
1. Name, address, and contact information of the engineer submitting the report, and
of the and owner and developer (or applicant if not the owner or developer). The
date of submittal should also be included.
2. Identification of the size and general nature of the proposed project. including any
proposed project phases. This paragraph should also include reference to
applications that are in process with either City: plat(s), site plans, zoning requests,
Page 1 of 26 APPENDIX. 0: TECH. DESIGN SUMMARY
As Revised February 2009
STORMWATER DESIGN GUIDELINES
Effective February 2007
SECTION [X
APPENDIX D - TECHNICAL DESIGN SUMMARY
or clearing /grading permits, as well as reference to any application numbers or
codes assigned by the City to such request.
3. The location of the project should be described. This should identify the Named
Regulatory Watersheds) in which it is located, how the entire project area is
situated therein, whether the property straddles a watershed or basin divide, the
approximate acreage in each basin, and whether its position in the Watershed
dictates use of detention design. The approximate proportion of the property in the
city limits and within the ETJ is to be identified, including whether the property
straddles city jurisdictional lines. If any portion of the property is in floodplains as
described in Flood Insurance Rate Maps published by FEMA that should be
disclosed.
4. The hydrologic characteristics of the property are to be described in broad terms:
existing land cover; how and where stormwater drains to and from neighboring
properties; ponds or wetland areas that tend to detain or store stormwater; existing
creeks, channels, and swales crossing or serving the property; all existing drainage
easements (or ROW) on the property, or on neighboring properties if they service
runoff to or from the property.
5. The general plan for managing stormwater in the entire project area must be
outlined to include the approximate size, and extent of use, of any of the following
features: storm drains coupled with streets; detention / retention facilities; buried
conveyance conduit independent of streets; swales or channels; bridges or culverts;
outfalls to principal watercourses or their tributaries; and treatment(s) of existing
watercourses. Also, any plans for reclaiming land within floodplain areas must be
outlined.
6. Coordination and permitting of stormwater matters must be addressed. This is to
include any specialized coordination that has occurred or is planned with other
entities (local, state, or federal). This may include agencies such as Brazos County
government, the Brazos River Authority, the Texas A &M University System, the
Texas Department of Transportation, the Texas Commission for Environmental
Quality, the US Army Corps of Engineers, the US Environmental Protection Agency,
et al. Mention must be made of any permits, agreements, or understandings that
pertain to the project.
7. Reference is to be made to the full drainage report (or the Technical Design
Summary Report) which the executive summary represents. The principal
elements of the main report (and its length), including any maps, drawings or
construction documents, should be itemized. An example statement might be:
"One -page drainage report dated , one set of
construction drawings ( sheets) dated , and a
-page specifications document dated comprise
the drainage report for this project."
STORMWATER DESIGN GUIDELINES
Effective February 2007 As Revised February 2009
Page 2 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
SECTION EX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Engineering and Design Professionals Information
Jurisdiction
City: Bryan
College Station
Engineering Firm Name and Address:
1'1'1.2 "�t°ac.dtrM.ac�� 'Z)r.
S ter . Zt
D
Sr 4.r1 Ta "7'1
Lead Engineer's Name and Contact Info. e -mail, fa>i):
ig
p (R1G %1..6S C.c
A. SQvh rk na eYE EtrAkL., r+l swv,.re,ne.� b�e�4c+n��r+c u
Supporting Engineering / Consulting Firm(s):
te" or r. - o acb.+cryL 1a«npy.e.
W S i T— SPe•C. GtruccoNs i Er125`11)e%
DDe:velo.per/ Ow:ner'/ Applicant :information
Name and Address: Phone and e -mail:
r.cS . 1.c s 4
Developer / Applicant I�
Ch6.e. cs Er1E 'S
WAS 41.4r►n Soetics
Ctosc Slrs.Arieevet Tie: - ns4s"
Property Owner(s) if not Developer / Applicant (& address):
'Project ldentific anon
Start (Page 2.1)
Date of Submittal 41111 Tote
Other:
Some. r.or , ?. E •
E e''14. C8 V %
Other contacts:
"Z 11 - (. "Z. tee 4't 'S
SQL t0$(4 O
Phone and e- mail:
)6
Development Name: F re'.c`( 5IJE,r.c S c``` 6 r>ht
Is subject property a site project, a single -phase subdivision; or part of a multi -phase subdivision?
S - Prc;f .c..sr If multi - phase: subject property is phase - of
Legal description of subject property (phase) or Project Area:
(see Section II, Paragraph B -3a)
Me•' 'Ca-LA r Lcasi e 44 - 46
Ca1L � S4w.r. eac^N. it -6405 Cipv
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.
0,11A
General Location of Project Area, or subject property (phase):
4.7, pro s: gee- .c,.,114.-f� }i oGG ` 4.E a4• s' ► ".t- 9r. rsac.4.*on > a=10 .t., r.
In Citv Limits?
Bryan: - acres.
College Station: I Le . t
STORMVt'ATER DESIGN GUIDELINES
Effective February 2007
acres.
Extraterritorial Jurisdiction (acreage):
Bryan: — College Station: -
.Acreage Outside ETJ:
Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February' 2009
,......., I-.,,." . 0 iaiva.
Stormwater Management Planning For Project or Subject Property (.or :Phase)
Planning Conference(s) & Date(s):
fq Iii
Participants:
NIA
I Preliminary Report Required? Ali oA 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.
Alb;
SECTION EX
Part 2 — Project Administration
Roadways abutting or within Project Area or
subject property:
SrhP ;nth S AC o - •
Named Regulatory Watercourse(s) & Watershed(s):
Preliminary Plat File #: 0.1 iF1
Name:
If two plats, second name:
Status: Adet
Zoning Type: A/ /41
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Project Identification (continued)
Abutting tracts, platted land, or built
developments:
, ..1..vitobe ?Nr..1, C;Jelac CS 5w: S4sri•r,
Charks Er '50fteg, • PcaP• ihr `S
44cwoa4 Gvg;e•.. 4.4..M -c-s - E+1.CD16. — 3orS40
6144 S 3tc.rsro.0 Cats.t - P.LCsii — gri.Ct
Tributary Basin(s):
Plat Information =For Project or Subject Property (or Phase)
•
Continued (page 2.2)
-Final Plat File #; _Date:_ .__. _.
Status and Vol /Pg:
Existing or Proposed? /J/4
File #:
Date:
Zoning Information ForProject :or Subject ;:Property (or Phase)
Zoning Type: 4 Existing or Proposed? Et 0144rt5 Case Code:
Case Date AIM Status: ACIA
Case Code: FE
Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 2 — Project Administration
Continued (page 2.3)
Coordination For Project or Subject Property (or Phase)
Note: For any Coordination of stormwater matters indicated below, attach documentation
describing and substantiating any agreements, understandings, contracts, or approvals.
Coordination
With Other
Departments of
Jurisdiction
City (Bryan or
College Station)
Dept.
Contact:
Date:
Subject:
Coordination With
Non - jurisdiction
City Needed?
Yes No
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
Brazos County
Needed?
Yes No ✓
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
TxDOT Needed?
Yes No .✓
Summarize need(s) & actions taken (include contacts & dates):
Coordination with
TAMUS Needed?
Yes No - 1
Summarize need(s) & actions taken (include contacts & dates):
Permits For Project or Subject Property (or Phase)
As to stormwater management, are permits required for the proposed work from any of the entities
listed below? If so, summarize status of efforts toward that objective in spaces below.
Entity
Permitted or
Approved .
Status of Actions (include dates)
US Army Crops of
Engineers
No ✓ Yes
US Environmental
Protection Agency
No ✓ Yes
Texas Commission on
Environmental Quality
No ✓ Yes
Brazos River
Authority
No ✓ Yes
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Start (Page 3.1)
Nature and Scope of Proposed Work
Existing: Land proposed for development currently used, including extent impervious
of cover?
Cur rein* 4 pas4v taa■d 4 % ) ; W1 0 • f "pervioos Co vc -
Site
Development
Project
(select all
applicable)
Redevelopment of one p latted lot, or two or more adjoining lots.
platted
✓ Building on a single platted lot of undeveloped land.
Building on two or more platted adjoining lots of undeveloped land.
Building on a single lot, or adjoining lots, where proposed will form
plat not
a new street (but may include ROW dedication to existing streets).
Other (explain):
Subdivision
Development
Project
Construction of streets and utilities to serve one or more platted lots.
Construction of streets and utilities to serve one or more lots
proposed on
lands represented by pending plats.
Describe
Nature and
Size of
Pro • osed
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
drainage easements or ROW.
1 - %Iv%evt°'u roc.tt aro* rtip rwp {Md a ctpprox∎v"..k..
Z. As a& . Pcf 4-c.r cortsi or,, pad wi 1l be- p rmci -
OYt- sw►ptarvivoi tows radio um-no-se %s 010 .
Project
Is any work planned on land that is not platted
If yes, explain:
or on and for which platting is not pending?
✓ No Yes
FEMA Floodplains
Is any part of subject property abutting a Named Regulatory Watercourse
(Section II, Paragraph B1) or a tributary thereof?
No /� Yes
Is any part of subject property in floodplain
area of a FEMA - regulated watercourse?
No Yes 1 Rate Map 4 1604-1eo14, D
Encroachment(s)
into Floodplain
areas planned?
No
Encroachment purpose(s): d Building site(s) Road crossing(s)
Utility crossing(s) Other (explain):
Yes .1
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.
Al 03 ; ?cc%tr"%rnar/ FtRrr' m...4 Lib olttc0 d..kcd tivgusk 4,7.0oct
51+ows +-vna. pw t■vv,:'K w;-1 . rl th, f loodp utz.i.N .
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Continued (Page 3.2)
Hydrologic Attributes of Subject Property (or Phase)
Has an earlier hydrologic analysis been done for larger area including subject property?
Yes
Reference the study (& date) here, and attach copy if not already in City files.
Is the stormwater
earlier study?
management plan for the property in substantial
Yes No If not, explain how
conformance with the
it differs.
No
No
If subject property
plan for the property
is not part of multi -phase project, describe
stormwater management
in Part 4.
If property is part of multi -phase project, provide overview of stormwater management plan
for Project Area here. In Part 4 describe how plan for subject property will comply
therewith.
Do existing
Describe
Tb wt
SVertS
- PMe.ca
topographic features on subject property store or detain
them (include approximate size, volume, outfall, model, etc).
■ s aurre...AM/ 1 pond onsi;t &pprox. O. tq ..
wo.*er ;or tag:crlirria porpostS . 'This pore,
in during eonskrwt*+ of is prbjet}
runoff? No ✓ Yes
, In size. . T1'tt Pond
is proposed '10 be.
Any known drainage or flooding problems in areas near subject property?
Identify: MN, pro a4 does 1►c wt:-W% Y tv.e_ too •
✓ No Yes
yr 4'looel p %e :n
Based on location of
(see Table B -1 in Appendix
Detention is required.
study property in a watershed. is Type 1 Detention (flood control) needed?
B)
✓ Need must be evaluated. Detention not required.
If the need for
Type 1 Detention`
must be evaluated:
What decision has been reached? By whom?
Dut to 4*nt.. SIVV LV 1w ..r b-SC +' % pos•r dews lopte1 c lows .
.1.1.-e..4-1 C. iVSneonC.0 off' ylsCuwWolre.r is retiotS4ceI •
How was determination made?
— prow.%01.t4;.‘ 4o ca - - eir 's Carca..1<
• jto. • co-k�.oar' of prtcltvtloptd 4
pest ewe-% condi:A4 0v‘s
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Continued (Page 3.3)
Hydrologic Attributes of Subject Property (or Phase) (continued)
Does subject property straddle a Watershed or Basin divide? ✓ 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? J No Yes
Size(s) of area(s) in acres: 1) 2) 3) 4)
Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable
concentrated section(s), small creek (non - regulatory), regulatory Watercourse or tributary);
Flow determination: Outline hydrologic methods and assumptions:
Does storm runoff drain from public easements or ROW onto or across subject property?
No Yes If yes, describe facilities in easement or ROW:
Are changes in runoff characteristics subject to change in future? Explain
Conveyance Pathways (Section II, Paragraph C2)
Must runoff from study property drain across lower properties before reaching a Regulatory
Watercourse or tributary? No ✓ Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies)�.
Runo{#' 4trOrv,. $ant. Sere. & art dro i' a_Qprox.. 1100 +6 Coo-• to (Jai-V.
v so- g 1 uato....J co nci.4-r -s .. 4o•.' . A a 'tow will Grass +k� sue_
Owr“.. r `s i ' ►e-5 Er- 'Torus 1 tltic l►bo<'i rt *rack bckor¢_
ci iseNesto.e5Z na i rk40 Ce, s C rcA_1C.
• SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES
Effective February 2007
Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 3 — Property Characteristics
Continued (Page 3.4)
Hydrologic Attributes of Subject Property (or Phase) (continued)
Conveyance Pathways (continued)
Do drainage
easements
exist for
part of
pathway(s)?
I No
any
If for what part of length? % Created by? plat, or
yes,
instrument. If instrument(s), describe their
provisions.
Yes
Pathway
Areas
Where runoff must cross lower properties, describe characteristics of abutting lower
property(ies). (Existing watercourses? Easement or Consent aquired ?)
>' iorry M forvoW crosses. ivnt htishbor r tra.c-r owr►td
bi • `es Eric So,ncS • This frs c-'E ss r+ . c. up o4'
pas u rt. larva w4 VA �t slope • Tc kps..ori•i. off' A}b.t
Fe-churl.. tarsi hs•s no +ve-es .
Nearby
Drainage
Facilities
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, lined channels, buried conduit, swales, detention ponds, etc).
Do any of
design?
/rI /A
these have hydrologic or hydraulic influence on
No Yes If yes, explain:
proposed stormwater
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Start (Page 4.1)
Stormwater Management Concept
Discharge(s) From Upland Area(s)
If runoff 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. 'h,t., roc4 'e s ;kt wM bc. 5144led Sv`c.1r }ha}
.14 s :.1t 1.)a\ rc.tew . rwor, wps'krtawl, aortas . n 41ne. sawte
rnownrutre. F %ow w:1% Ai rN be. ak►k- 40 r aer'ot' 4% Itme..44orst_
rock( pad au,d •4owaxd 0%4 paS4v.re.. laru4 • 'TF+c Sra.d.i o$ W. pc4.l
i , bost4 or. a 1�:51r. po ir,•4 in }1..a es r kerr &v..) yr 3 c1 c u}wsrcl
40 i teiscs in a. r►or•OneASi , SDASIVAIL4 t ..nel so044%•e54 dArt ton .
No 4+* *. rt. cleva.- 1opweus4v4 Prrow% ups4reerr., 0.4rea.4 are. projctke.c1.
Discharge(s) To Lower Property(ies) (Section II, Paragraph El)
Does project include drainage features (existing or future) proposed to become public via
platting? ✓ No Yes Separate Instrument? // No Yes
Per Guidelines reference above, how will
runoff be discharged to neighboring
property(ies)?
Establishing Easements (Scenario 1)
Pre - development Release (Scenario 2)
Combination of the two Scenarios
Scenario 1: If easements are proposed, describe where needed,
and provide status of actions
on each. (Attached Exhibit # )
Scenario 2: Provide general description of how release(s) will be to
managed pre - development
conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit # )
Rteaust. • si-Vt. is proposed 40 be 0. ttrncs4or . rock paa
cv4 -Mt. tXisk irv3 pond C oftptxrwvS Core r . ) :s be.inr►A A•4d +n
4% c. pock dt.vc. lope.! -Plows a+rt ornln ststi$'1h -htShfr . 41% *r j4
pre developed cnnd2:4► o r . /...sse oc his anal 44.4. close
pro ctor.: ♦'1 $o Co rle„r s C ct k. , wt. pro pose. c4:.- t,-.l �,onre,�.lar►ce .
c P(1. du e
opal wood pos4 olcveto pcd drni►•No.9s. arc Maps aps a+.d Cr1C.+4144
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.
The. owner o f 4ht rrCE.%v:v proPo'ky iS ++."- dew r ar
clope� o
"Des`s propexl..j
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES
Effective February 2007
Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept (continued)
Within Project Area Of Multi -Phase Project kJ 1 F
Will project result
in shifting runoff
between Basins or
between
Watersheds?
No
Identify gaining Basins or Watersheds and acres shifting:
What design and mitigation is used to compensate for increased runoff
from gaining basin or watershed?
Yes
How will runoff from Project
Area be mitigated to pre-
development conditions?
Select any or all of 1, 2,
and /or 3, and explain below.
1. With facility(ies) involving other
development projects.
overall Project Area.
within Project Area.
2 Establishing features to serve
3. On phase (or site) project basis
1. Shared facility (type
& location
Exhibit
of facility; design drainage area served;
# )
relationship to size of
Project Area): (Attached
2. For Overall Project 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.
c-
Q)
a
In
r
E
Q) o
O z
D
L
to
Are aquatic echosystems
project(s)?
proposed? No Yes
In which phase(s) or
Are other Best Management
No Yes
Practices for reducing stormwater pollutants proposed?
Summarize type of BIM and extent of use:
If design of
Specifications,
Detention
any runoff-
check
elements
handling facilities deviate from provisions of B -CS Technical
type facility(ies) and explain in later questions.
Conduit elements Channel features
Swales
Ditches Inlets Valley gutters Outfalls
Culvert
features
Bridges Other
SECTION EX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Paoe 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.3)
Stormwater Management Concept (continued)
Within Project Area Of Multi -Phase Project (continued) Aj f A
I 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)
1
If property part of larger Project Area, is design in substantial conformance with earlier analysis
and report for larger area? Yes No, then summarize the difference(s):
M 1 ict
Identify whether each of the types of drainage features listed below are included, extent of use,
and general characteristics.
r
Typical shape?
Surfaces?
u) a
a)
o
Steepest side slopes:
Usual front slopes:
Usual back slopes:
Flow line slopes: least
Typica distance from travelway:
(Attached Exhibit # )
typical
a o
9 Z
CO
2
°'
greatest
Are longitudinal culvert ends in compliance with B -CS Standard Specifications?
Yes No, then explain:
I
I
(-- }
At intersections or otherwise, do valley gutters cross arterial or collector streets?
No Yes If yes explain:
r CU
0 a)
z
Are valley gutters proposed to cross any street away from an intersection?
No Yes Explain: (number of locations ?)
a
Q
I
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
SECTION EX'
Part 4 — Drainage Concept and Design Parameters
Within Or Serving Subject Property (Phase, or Site) (continued)
}
E
CZ Z
Stormwater Management Concept (continued)
Gutter line slopes: Least
Are inlets recessed on arterial and collector streets?
identify where and why.
Will inlets capture 10 - year design stormflow to prevent flooding of intersections (arterial
with arterial or collector)? Yes No If no, explain where and why not.
Will inlet size and placement prevent exceeding allowable water spread for 10 -year
design storm throughout site (or phase)? Yes No If no, explain.
Sag curves: Are inlets placed at low points? Yes No Are inlets and
conduit sized to prevent 100 -year stormflow from ponding at greater than 24 inches?
Yes No Explain "no" answers.
Will 100 - yr stormflow be contained in combination of ROW and buried conduit on
whole length of all streets? Yes No If no describe where and why.
Do designs for curb, gutter, and inlets comply with B -CS Technical Specifications?
Yes No If not, describe difference(s) and attach justification.
. Are any 12 -inch laterals used?
used.
Pipe runs between system
access points (feet):
APPENDIX D - TECHNICAL DESIGN SUMMARY
Are junction boxes used at each bend?
and why.
Usual Greatest
Continued (Page 4.4)
Yes No If "
No Yes Identify length(s) and where
Typical Longest
Yes No If not. explain where
Are downstream soffits at or below upstream soffits? Least amount that hydraulic
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 February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.5)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
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Describe watercourse(s), or system(s) receiving system discharge(s) below
(include design discharge velocity, and angle between converging flow lines).
1) Watercourse (or system), velocity, and angle?
2) Watercourse (or system), velocity, and angle?
3) Watercourse (or system), velocity, and angle?
For each outfall above, what measures are taken to prevent erosion or scour of
rec and all facilities at juncture?
1)
2)
3)
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Are swale(s)
Number
situated along property lines between properties?
of instances: For each instance answer the following
No Yes
questions.
Surface treatments (including low -flow flumes if any):
Flow line slopes (minimum and maximum):
Outfall characteristics for each (velocity convergent angle, & end treatment).
Will 100
ROW in
-year design storm runoff be contained within easement(s)
all instances? Yes No If "no' explain:
or platted drainage
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
'SECTION IX
Part 4 — Drainage Concept and Design Parameters
Within Or Serving Subject Property (Phase, or Site) (continued)
Are roadside ditches used? No Yes If so provide the following:
Is 25 -year flow contained with 6 inches of freeboard throughout ? Yes No
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
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APPENDIX D - TECHNICAL DESIGN SUMMARY
Stormwater Management Concept (continued)
For any "no" answers provide location(s) and explain:
Continued (Page 4.6)
If conduit is beneath a swale, provide the following information (each instance).
instance 1 Describe general location, approximate length:
Is 100 -year design flow contained in conduit / swale combination? Yes No
If "no" explain:
Space for 100 -year storm flow? ROVV Easement Width
Swale Surface type, minimum Conduit Type and size, minimum and maximum
and maximum slopes: slopes, design storm:
Inlets Describe how conduit is loaded (from streets /storm drains.. inlets by type):
Access Describe how maintenance access is provided (to swale, into conduit):
Instance 2 Describe general location approximate length:
Is 100 -year design floe' contained in conduit /swale combination? Yes No
If 'no" explain:
Space for 100 -year storm flow? ROW Easement Width
Swale Surface type; minimum Conduit Type and size, minimum and maximum
and maximum slopes: slopes, design storm:
Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type):
Access Describe how maintenance access is provided (to swale, into conduit):
STORMWATER DESIGN GUIDELINES
Effective February 2007
Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
SECTION IX
Part 4 — Drainage Concept and Design Parameters
Within Or Serving Subject Property (Phase, or Site) (continued)
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APPENDIX D - TECHNICAL DESIGN SUMMARY
Stormwater Management Concept (continued)
If "yes" provide the following information for each instance:
Instance 1 Describe general location, approximate length, surfacing:
Is 100 -year design flow contained in swale? Yes No Is swale wholly
within drainage ROW? Yes No Explain "no" answers:
Access Describe how maintenance access is provide:
Instance 2 Describe general location, approximate length, surfacing:
Continued (Page 4.7)
Is 100 -year design flow contained in swale? Yes No Is swale wholly
within drainage ROW? Yes No Explain "no" answers:
Access Describe how maintenance access is provided:
Instance 3, 4. etc. If swales are used in more than two instances, attach sheet
providing all above information for each instance.
"New" channels: Will any area(s) of concentrated flow be channelized (deepened,
widened, or straightened) or otherwise altered? No Yes If only slightly
shaped. see "Swales" in this Part. If creating side banks. provide information below.
Will design replicate natural channel? Yes No If "no'', for each instance
describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year
design flow. and amount of freeboard:
Instance 1:
Instance 2:
Instance 3:
STORMVVATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
•
SECTION [X
Part 4 — Drainage Concept and Design Parameters
Within Or Serving Subject Property (Phase, or Site) (continued)
Existing channels (small creeks): Are these used? No Yes
If "yes' provide the information below.
Will small creeks and their floodplains remain undisturbed? Yes No How
many disturbance instances? Identify each planned location:
APPENDIX D - TECHNICAL DESIGN SUMMARY
Stormwater Management Concept (continued)
Continued (Page 4.8)
r.f /r;
For each location, describe length and general type of proposed improvement
(including floodplain changes):
For each location, describe section shape & area, flow line slope (min. & max.),
surfaces, and 100 -year design flow.
Watercourses (and tributaries): Aside from fringe changes, are Regulatory
Watercourses proposed to be altered? No Yes Explain below
Submit full report describing proposed changes to Regulatory Watercourses. Address
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:
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:
STORMVVATER DESIGN GUIDELINES Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
Part 4 — Draina•e Concept and Desi• n Parameters
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:
Acres served & design volume + 10%
100 -yr volume: free flow & plugged
Design discharge (10 yr & 25 yr)
Spillway crest at 100 -yr WSE?
1 Berms 6 inches above plugged WSE?
Continued (Page 4.9)
Faci ity 1 Faci ity 2
yes no yes no
yes no yes no
a>
Explain any "no" answers:
SECTION IX
0
Z
0
0
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:
w
a For each what is velocity of 25 -yr design discharge at outlet? & at spillway?
a) Facility 1: & Facility 2: &
0 Are energy dissipation measures used? No Yes Describe type and
u- location:
0
m
0
O
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
Facility 1:
Facility 2:
APPENDIX D - TECHNICAL DESIGN SUMMARY
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
Effective February 2007 As Revised February 2009
Page 18 of 26 APPENDIX. D: TECH. 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)
a)
Fi
2 m
c
O C
.� O
c U
co
0
Do structures comply with B -CS Specifications? Yes or no, and explain if "no ":
Facility 1;
Facility 2:
For additional facilities provide all same information on a separate sheet.
Are areas to be used for detention? No Yes What is
parking
maximum depth due to required design storm?
u)
0)
r
Roadside Ditches: Will culverts serve access driveways at roadside ditches?
I No Yes If "yes ", provide information in next two boxes.
flow without flowing over driveway in all cases? Yes if No
Will 25 -yr. pass
flowing or standing water on public roadway? Yes ✓ No
Without causing
& with B -CS Technical Specifications? Yes ✓ No
Designs materials comply
Explain any "no" answers:
Are to public roadway alignment? Yes I No Explain:
2 o
U N
Q) a1
a)
a �
i8
°
� z
culverts parallel
Creeks at Private Drives: Do private driveways, drives, or streets cross drainage
ways that serve Above - Project areas or are in public easements/ ROW?
No J Yes If "yes" provide information below.
Y es p
En
J
U
a'
Q
How many instances? Describe location and provide information below.
Location 1: �rivtwW t , v ∎ h v o . 4c S... ;lea-. sir r o' drwelj4 .i *
?fop 05.4-4 •
Location 2:
Location 3:
For each location enter value for:
1
2
3
Design year passing without toping travelway?
too
Water depth on travelway at 25 -year flow?
D
Water depth on travelway at 100 -year flow?
For more instances describe location and same information on separate sheet.
SECTION 'IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.11)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
'le
a)
w
a,
} a
1 $
o
o
o .
z
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?
No Yes How many instances? For each identify the
location and provide the information below.
Instance 1:
Instance 2:
Instance 3:
Yes or No for the 100 -year design flow:
1
2
3
o
a)
E
Headwater WSE 1 foot below lowest curb top?
Spread of headwater within ROW or easement?
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io Q
w c
cu
o
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a) c
Is velocity limited per conditions (Table C -11)?
Explain any "no" answer(s):
Minor Collector or Local Streets: Will culverts serve these types of streets?
No Yes How many instances? for each identify
the
location and provide the information below:
Instance 1:
Instance 2:
Instance 3:
For each instance enter value, or "yes" / "no" for: .
1
2
3
D yr. headwater WSE 1 ft. below curb top?
< a,
100 -yr. max. depth at street crown 2 feet or less?
E
Product of velocity (fps) & depth at crown (ft) _ ?
o
Is velocity limited per conditions (Table C -11)?
Limit of down stream analysis (feet)?
Explain any "no" answers:
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
SECTON (X
APPENDIX D - TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES
Effective February 2007
Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Draina•e Concept and Desi• n Parameters
Continued (Page 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued) bj i It
All Proposed Culverts: For all proposed culvert facilities (except
driveway /roadside
boxes.
ditch intersects) provide information requested in next eight
travelways intersect at 90 degrees? Yes No If not,
Do culverts and
identify location(s) and intersect angle(s), and justify the design(s):
Does drainage way alignment change within or near limits of
approaches thereto? No Yes If "yes" identify location(s),
culvert and surfaced
describe
change(s), and justification:
to discharge into culvert barrel(s)? No Yes If yes,
Are flumes or conduit
identify location(s) and provide justification:
Are flumes or conduit to discharge into or near surfaced approaches
No Yes If ''yes' identify location(s), describe
to culvert ends?
outfall design treatment(s):
Is scour /erosion protection provided to ensure long term stability of culvert structural
and surfacing at culvert ends? Yes No If "no" Identify
components,
locations and provide justification(s):
Will 100 -yr flow and spread of backwater be fully contained
drainage easements/ ROW? Yes No if not, why
in street ROW, and /or
not?
Do appreciable hydraulic effects of any culvert extend downstream
neighboring land(s) not encompassed in subject property?
'yes' describe location(s) and mitigation measures:
or upstream to
No Yes If
Are all culvert designs and materials in compliance with B -CS Tech. Specifications?
Yes No If not explain in Special Design Section of this Part.
SECTON (X
APPENDIX D - TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES
Effective February 2007
Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.13)
Stormwater Management Concept (continued
Within Or Serving Subject Property (Phase, or Site) (continued)
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)?
a)
m
What drainage way(s) is to be crossed?
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:
a
m
Is a Stormwater
Pollution Prevention
Plan (SW3P)
established for
project construction?
No +' Yes
Provide a general description of planned techniques:
Si ! cc .c r C.er► v c Ev4y-�►r.cc. / Ex :4-
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?
J 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:
/4 /F4
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
Part
4 — Drainage Concept and Design Parameters
Stormwater Management Concept (continued)
Continued (Page 4.14)
Within Or Serving Subject Property (Phase, or Site) (continued)
Special Designs — Deviation From B -CS Technical Specifications N/A
If any design(s) or material(s) of traditional runoff- handling facilities
B -CS Technical Specifications, check type facility(ies) and explain by
Detention elements Drain system elements
deviate from provisions of
specific detail element.
Channel features
Inlets Outfalls
Culvert features Swales Ditches
Valley gutters Bridges (explain in bridge report)
In table below briefly identify specific element, justification for deviation(s).
Specific Detail Element
Justification for Deviation (attach additional sheets if needed)
1)
2)
3)
4)
5)
Have elements been coordinated with the City Engineer or her /his designee? For each item
above provide "yes" or "no ", action date, and staff name:
1)
2)
3) ,
4)
5)
Design Parameters
Hydrology
Is a map(s) showing all Design Drainage Areas provided? f
Yes No
Briefly summarize the range of applications made of the Rational Formula: .
�,`cvA pr a,v pos+ di c oiled pc .o .V.- �r `tows v's "^s poa-so .okr5
Amt.. Iace! ins des: -, cyt.;44cVw cs /awl t rc )t CS "h Cippo.ctis. C. 0Q /► +A.kr
ped-vw . Av oex.k.. etArwrr Cli4C;e4 De 0.4 e$ WSJ T yr 14.4
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What is the size and location of largest
has been applied? 1 . ' 1 t acres
Design Drainage Area to which the Rational Formula
Location (or identifier): I Dlct t (.Posk . 4„ • P<<
SECTION EX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
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? /oo
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
MIA
NIA
Storm drain system for local streets
NIA
Tj)A
Open channels
NIA
NIA
Swale /buried conduit combination in lieu of channel
N/4
/4 IA
Swales
100
ZS
Roadside ditches and culverts serving them
NIA
NIR
Detention facilities: spillway crest and its outfall
NSA
NSA
Detention facilities: outlet and conveyance structure(s)
AIM
NU*
Detention facilities: volume when outlet plugged
N/A
NA
Culverts serving private drives or streets
too
to
Culverts serving public roadways
N IA
NSA
Bridges: provide in bridge report.
MA
AIifi
Hydraulics
What is the range of design flow velocities as outlined below?
Design flow velocities;
Gutters
Conduit
Culverts
Swales
Channels
Highest (feet per second)
—
—
3.04
Z.ote
—
Lowest (feet per second)
--
-
V.°64
2 Ols R
Streets and Storm Drain Systems Provide the summary information outlined below:
Roughness coefficients used: For street gutters:
For conduit type(s) — — Coefficients: —
SECTION IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D — TECHNICAL DESIGN SUMMARY
Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
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? No Yes Head and friction losses No Yes
Explain any "yes" answer:
Ai I A
In conduit is velocity generally increased in the downstream direction?
Are elevation drops provided at inlets, manholes, and junction boxes?
Explain any "no" answers:
NIA
Yes
No
Yes
No
lines calculated and shown for design storm? Yes No
Are hydraulic grade
For 100 -year flow conditions? Yes No Explain any
"no" answers:
NiSk
What tailwater conditions were assumed at outfall point(s) of the storm drain system?
each location and explain:
Ai it;
Identify
Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.8?
Yes •
No
Outside of straight sections, is flow regime within limits of sub - critical
If "no" list locations and explain:
flow_.? Yes
No
Culverts If plan sheets do not provide the following for each culvert, describe it here.
For each design discharge, will operation be outlet (barrel) control or inlet control?
t nV - Cc he'd\
Entrance, friction and exit losses:
Bridges Provide all in bridge report
Al igt
SECT ON IX
STORMWATER DESIGN GUIDELINES
Effective February 2007
APPENDIX D - TECHNICAL DESIGN SUMMARY
Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
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
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:
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O Pat'V(fi Wit(�Adr SAvcim, UsepaI. e see r count.
Fen1Pi FI, ve c1 PArmp
0.:no.s„ Prt.k 1Ma.ps
Flow 0AAu.�,}io"S
Cu tW e 4 I S wale. CAA. w►•60\
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."
_ . 0 0...�""� u
O 7.% om
(Affix Seal)
/ 1 i c o '.. .... . I
fig
.�/► /�
*. ' � • . *
� i
L' ensed Professional Engineer e
/
MARK A. SAVARINO 0
j
State of Texas PE No. 1' 1 441 ,1
V. 105149 la j
p' ..*‘/C p,r c %
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
STORMWATER DESIGN GUIDELINES
Effective February 2007
k `` io "` — < «Ic 1D
Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
As Revised February 2009
EXHIBIT B
FEMA FLOOD MAP
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EXHIBIT C
GENERAL LOCATION MAP
L<<j
'REV
DATE
BY
APP
COMMENT
I PREPARED FM
9N
00.165 ERIC ALES
100111 *LW RO
COLLEGE 11760k II 5)516
SCALE: As SHOW
RM. 2079
DRAM BY: W\5
PROJECT MANAGER: SAY J. VERNON. PE
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VICINITY MAP EXHIBIT
ENTERGY SWITCH STATION
B&A# -10164
cur OF COLLEGE STATION
BRAZOS comm. TEXAS
Bleyl & Associates
Project Engineering & Management
1722 BROADMOOR, STE. 210 2251 N. LOOP 335 W
BRYAN, TEXAS 77802 CONROE, TEXAS 77304
979 286 -1125 PH (936) 441 -7833 PHONE
979 280 -3844 FAX ONE (936) 760 -3533 FAX
TEXAS BOARD of PROFESSIONAL ENGINEERS F -678
f
PROPOSED
LOCATION
X
SCALE: 1"=1500'
♦
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81
EXHIBIT D
DRAINAGE AREA MAPS
PREPARED FOR:
CHARLES ERIC JONES
10996 NUNN RD
COLLEGE STATION, TX 77845
SCALE:
DATE: Mor9N 10
DRAWN BY
PROJECT MANAGER:
SAM J. VERNON, P.E.
2: \10100 \10164 ENTERGY SUBSTATION COLLEGE STATION \ENG \DRAINAGE \EXHIBITS \DA MAP_4 -15 -10 \PRE DEVELOPED DA 4/15/2010 4:25 PM MARK SAVARINO
0
PREDEVELOPED DRAINAGE AREA MAP
ENTERGY SWITCH STATION
B &A# -10164
CITY OF COLLEGE STATION
BRAZOS COUNTY, TEXAS
B
A
Bleyl & Associates
Project Engineering & Management
100 NUGENT
CONROE, TEXAS 77301
(936) PHONE
760-3833 (936) FAX
1722 BROADMOOR, STE. 210
BRYAN, TEXAS 77802
(979) 268 -1125 PHONE
(979) 260 -3849 FAX
TEXAS BOARD of PROFESSIONAL ENGINEERS: F -67B
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PREPARED FOR:
CHARLES ERIC JONES
10999 NUNN RD
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SCALE:
DATE: March 10
DRAWN BE
PROJECT MANAGER:
SAM J. VERNON, P.E.
: \10100 \10164 ENTERGY SUBSTATION COLLEGE STATION \ENG \DRAINAGE \EXHIBITS \DA MAP _4 -15 -10 \POST DEVELOPED DA 4/16/2010 12:03 PM MARK SAVARINO
POST DEVELOPED
DRAINAGE AREA MAP
ENTERGY SWITCH STATION
B &A# -10164
CITY OF COLLEGE STATION
BRAZOS COUNTY, TEXAS
Bleyl & Associates
Project Engineering & Management
1722 BROADMOOR, STE. 210 100 NUGENT
BRYAN, TEXAS 77802 CONROE, TEXAS 77301
(979 260-3849 FAX (9 (936) 4 760 3833 PHONE FAX
TEXAS BOARD of PROFESSIONAL ENGINEERS: F -678
A
DATE
APP COMMENT
EXHIBIT E
PRE VS POST DRAINAGE
CALCULATIONS
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Job No. 10164
EXHIBIT F
CULVERT / SWALE CALCULATIONS
Drainage Swale
No freeboard
Channel Sections
Calcs:
A =
Pw =
Rh =
t
3 ft
8.12
0.37
(
Flow:
TW (ft)
BW (ft)
SS (ft/ft)
D ( ft/ft)
S (ft/ft)
1
8
4
4
0.50
0.0065
2
Average
8
4
0.250
1
0.007
Equations: Input:
A = B *y + ss * y ^2 n = 0.03 ("n- values" sheet)
Pw = B + 2 *y *(1 +ss ^ 2) B = 4 ft
y = 1 ft
ss = 4.00 (H:V)
S = 0.007 ft/ft
Q=
V =
6.18
2.06
cfs
fts
1' of freeboard
Channel Sections
Calcs:
A =
Pw =
Rh =
15 ft'
16.37
0.92
Flow:
TW (ft)
BW (ft)
SS ( ft/ft)
D (ft /ft)
S (ft /ft)
1
16
4
4
1.50
0.0065
2
Average
16
4
0.250
2
0.007
Equations: Input:
A = B *y + ss * y ^2 n = 0.035 ("n- values" sheet)
Pw = B + 2 *y *(1 +ss ^ 2) B = 4 ft
y = 2 ft
ss = 4.00 (H:V)
S = 0.007 ft/ft
Q =
V =
48.57
3.24
cfs
fts
Drainage Infrastructure Calculations
Culvert Calculations
Manning's Equation
18" Culvert
Circular Channel
Equations: Input:
A = Pi *D ^2/4 n =
Pw = Pi *D D =
S=
0.013 ( "n- values" sheet)
1.5 ft
0.00260 ft/ft
Calcs:
A=
Pw =
Rh =
1.77 ft
4.71
0.38
Flow:
5.37 cfs
3.04 fits
Swale Calculations
Manning's Equation