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Home My WebLink AboutDrainage ReportDrainage Report for Dove Crossing Subdivision Phase 8 College Station, Texas May,2007 Revised July, 2007 Developer: Dove Crossing Development, LLC 1401 Sebesta Ro ad College Station, TX 77841 (979) 693-6699 Prepared fly_;_ Civil Development, Ltd. 2033 Harvey Mitchell Parkway South College Station, Texas 77840 (979) 764-7743 ENGINEER Draina ge Report -Exec uti ve Summ ary Dove Cro ss in g Subdi vision , Ph ase 8 Coll ege Station, Texas Ori gin al: May 21, 2007 Rev ised: July 9, 2007 C ivil Development, Ltd. -Ginger Urso, P.E. (ginger@cdlbcs.com) P .O. Box I I 929 College Stati on, Texas 77842 Phone: (979) 764-7743 Fax: (979) 764-7759 OWNER/DEVELOPER Dove Crossing Development, LLC 1401 Sebesta Road College Stati on, Texas 77845 Phone: (979) 693-6699 GENERAL DESCRIPTION AND LOCATJON This project consists of the development of Phase 8 of the Dove Crossing Subdivision, a single-family residential subdivision in Coll ege Station. Development includes the construction of utili ties and infrastructure. Phase 8 is located adjacent to Phases 2, 3 & 4 of the Dove Crossing development, which is on the south side of Graham Road just east of the Cypress Grove Elementary School. The entire site lies within the corporate limits of the City of College Station. Area: 10.799 acres Existing Land Use: Vacant Proposed Land Use: Sin g le-Fami ly Residential Number of Lots: 51 lots Drainage Basin: South Fork of Lick Creek FEMA FIRM: #4804 1C0201 D, dated 2/9/2000 Floodplain: No portion of thi s phase of the development lies within the fl oodplain. HYDROLOGIC CHARACTERI STICS The existing site is predominately open space with a few scattered mesquite trees. The e levati ons range from 289 to 300, sloping in a southerly direction, where runoff enters the South Fork of Li ck C reek within the limits of this development, w hi ch ultimately flows into Lick Creek. Two detent ion ponds were constructed with previous phases of this development, and the runoff for Phase 8 flows into existing Pond No. 2. GENERAL STORMWATER PLAN The drainage plan fo r Phase 8 w ill connect to the existing storm sewer system in Phases 3 & 4. It wi ll mvo lve th e in stallation additiona l pipes, inlets &junction boxes, which wil l collect and transmit the runoff from Phase 8 to 2 proposed channe ls that will take the runoff to the existing detention pond, Pond o. 2. The detention pond captures water from the proposed cl eve lo pment. The out fa I I from th e detention pond consists or 2-12'" diameter pipes and an outlet structure with a 42" discharge pipe. COORDI NATIO N & STORIYIWATER PE R IITTING The pro.1 eet w ill require that a Notice or Intent be submitted to the Texas Commi ssion !Or Environmental Quality. 0 other permits arc an ti c i p~llcd ror this project. l'.11•,· I ••I .' The following items comprise this drainage report for this project: Executive Summary Technical Design Summary Detention Pond #2 Analysis CERTIFICATION I, Ginger Urso, Licensed Professional Engineer No. 89503, State of Texas, certify that thi s revised report for the drainage design for Dove Crossing Subdivision, Pftase 8, was prepared by me in accordance with the provisions of the Unified Stormwater Design Guidelines. l '.l ~'l' _) I lj .' SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Start (Page 2.1) Engineering and Design Professionals Information Engineering Firm Name and Address: Jurisdiction {';vd D.ev.vlopW\t~1 Ltd. City: __ Bryan ·-p .0 .. fu l l q 2§( i/' College Station C.o lkt-1e. Sr<-t:h'~1 Tx l /104'-Date of Submittal: J 5" /::z-1 /z_.vo·r bther: Lead Enqineer's Name and Contact lnfo.{phone, e-mail, fax): bit')$jr /)Y~ P.e . f.h~ ILA -774-=) t1f~ c'..L,(x 6c .. s 1.:.:i~ fc."0< 71_,,{J ... 77 '5"(1 Supporting Engineering I Consulting Firm(s): Other contacts: Developer I Owner I Applicant Information Developer I Applicant Name and Address: Phone and e-mail: ~R (_.,o~ "':>; v-e-) 1>-t.. ...t ..:.. \ O\VV\-e ""--{ 1 LL(__ 1LI 0 1 s..<-bz ">-¥'c.-12-o~t C"' \ \.e<-je S*'-. -t1 r•-,;-1x -i-1V-tc; Property Owner(s) if not Develo per I Applicant (& address): Phone and e-mail: ·--- Project Identification Is subject property a site project, a single-phase subdivision, or part of a multi-phase subdivision? 'f'\"'1 v-.\ .\-i -phtty_.., If multi-phase, subject property is phase~ B of _q~- Legal description of subject property (phase) or Project Area: * fJhQS-e. '> 5 (p ~ 1 h:I.\/~ (see Section 11 , Paragraph B-3a) Vlo+ ~ ~~~ w ~ev-.*~;\-~ . If subject property (phase) is second or later phase of a project, describe general status of all ea rlier phases. For most recent earlier phase Include submittal and review dates. ·°Pv'''-~ .1-(1. 1 1.~, 1-C 12...1 ~ ~ 4 ~\K ··~ll ~ c 0\ry""\.~+e..c~ i o•~ c~.r~ ~_._,.._ u ....... v u....tl"()-V\ (_Ph ~ ~ tt ). General ~ocation of Project Area, or subject property (phase): . ~ P,.t.l)c.·,U....v·A· fv Pl-iq~S~\JI..._ ... .,.._ ~ ~ovR .,,.,;cL... ~,.(_ ~!,_a..,.,__, k<:>cuo-1 _._ ...... .,f o f ~C.·tpv~SS G..-ov( 8kV1A eV"'--t<ZJ Sc:..-1.-,.o._rl'_ In City Limits? Bryan: ___ -__ acres. College Station: -~)D_._(_CJ_'7 __ acres. STORMWATER DESIGN GUIDELINES Effective February 2007 Extraterritorial Jurisdiction (acreage): Bryan: -Co llege Station:-:==---- Acreage Outsid e ET J: __ -__ _ Page 3 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or Abutting tracts, platted land , or built subject property developments : ( ) nea..v-&v t?--htt-fy\ f<_o~ j,,/5o • .., 1vo..vr 311 r;/5S j /L-Lit" d 'f>tY1 €..vtJ· ( 2-<;" Yl I 7 ') yki-To..., ~ves-!w-ev-i..ts u...P(lo/43./~) Tu ' f-Yt><...S•'.-P. Ph 4 r :.n~ t:.1,,.J -111 d -e Named Reg ulatory Watercourse(s) & Watershed(s): Tributary Basin(s): L1cJ-lv-~ Sn~ rov-'?-o~ Lt&-C<.u,k Plat Information For Project or Subject Property (or Phase) Preliminary Plat File#: OS -500 I:, S Final Plat File #: Date: Name: l)o-.i{.. Cvc'/--;:,~ ...... s._ Status and Vol/Pg: If two plats, second name: u File#: Status: Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: /(-/ , Existing or 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: ~/fr Preliminary Report Required? f-i[~ 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. ~1~ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 4 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Re vised ---- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I 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 Dept Contact: Date: Subject: 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 ___L Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes No / -- Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? Yes No v ---- Coordination with Summarize need(s) & actions taken (include contacts & dates): T AMUS Needed? Yes __ No---1L'.'.::. 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 Status of Actions (include dates) Approved? US Army Crops of Engineers No /'Yes - US Environmental Protection Agency No v Yes - Texas Commission on Gt~t..-o . ...l PenNt ;V ~i I ~ h-<-{iLu,{ ~ ~ C, v. fvc:\.c-~ v Environmental Qua lity No Yes --v 150000 Brazos River Authority No v Yes - STORMWATER DESIGN GUIDELINES Effective February 2007 Page 5 of 26 APPENDIX. D TECH. DE SIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~erty Characteristics I Start (Page 3.1) Nature and Scope of Proposed Work Existing: Land proposed for development currently used, including extent of impervious cover? M-v6\Lan r 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 __ Building on a single lot, or adjoining lots, where proposed plat will not form applicable) a new street (but may include ROW dedication to existing streets). __ Other (explain): Subdivision _l.L_ 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 projects: 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 drainage easements or ROW. Size of SI Lo f> ..::=}!< -1, 1<-esU~f,'0-.J Pro[!osed 2 / 0S LF o f !>fv~+-(2 7 ' w.·.J-1-t,) Project 4-~ ?JL.f of Con~Y--..e,f-.e Qjf ( (w~ w:d ./-f...) Is any work planned on land that is not platted If yes, expla in: 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 --1L'.:_ (Section 11, Paragraph B1 ) or a tributary thereof? Is any part of subject property in floodplain 'No~ Yes Rate Map area of a FEMA-regulated watercourse? -- Encroachment( s) Encroachment purpose(s): __ Building site(s) __ Road crossing(s) into Floodplain areas planned? __ Utility crossing(s) __ Other (explain): No v -- Yes -- If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA- approved Fl_ood Study to define allowable encroachm_ents in proposed areas? Explain. A ~11.,\':i..~'> Ot ...{kt_ .~v~ '11 .. ¥-~ LlJ:..: ~ ~ "'-'c>-S ~I"~ , s;o< ~ t<\-4..o__.-.An1..\. ~ ~'>t\\t.....\A ~At v1 'i.\.UV'~, k+. n'b ~•"M. -t\,...J -to~ ~~ ou.-v-v-..-w . STORMWATER DESIGN GUIDELINES Effective Febru ary 2007 Page 6 of 26 APPENDIX. D TECH. DE SIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~erty Characteristics I Continued (Page 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic analysis been done for larger area including subject property? Reference the study (&date) here, and attach copy if not already in City files. Yes _L ty~"o.'/, W cd-eJt \ ~,... R..er w+-ft,v-/\le-)l 11-.,0n·.:-$'.J?).'vis£o.., ft,. I ~ 5""1 tJ &o/. lq '1'1 ~-·-""Yr Wa..,h-i ~ 5(.wev~fO"t f::>.,.. LN.t.Sft)e_l 4 Vdlu..1{ 5.,..h)1'v1.sion1 f:e.b. z_.:,-:.>L. 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~ 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 v Yes Describe them (include approximate size, volume, outfall, model, etc). . E-!c1's':R <;fct.L po""/; havt '=· ~f-'ed fo rJ,~ ...... ""' Jeh VV1 p~. Any known drainage or flooding problems in areas near subject property? ____L_ 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) ____L_ Detention is required. Need must be evaluated. __ Detention not required . -- What decision has been reached? By whom? If the need for /k.-f-.evi.:h 'o...,, ,-> ~) Type 1 Detention How was determination made? must be evaluated: ,+ee i STORMWATER DESIGN GUIDELINES Effective February 2007 ~ .. ~L1 ~ ·s Page 7 of 26 r de '?1'c,v-. ,'~ 0 Y' 0 v, ·cL_d fov -It..<. ~ J I f APPENDIX. D TECH. DESIGN SUMMARY As Revised ___ _ ~ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro12ert~ Characteristics I Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) Does subject property straddle a Watershed or Basin divide? v No --Yes If yes, describe splits below. In Part 4 describe desiqn concept for handling this . Watershed or Basin Larger acreage Lesser acreaqe Above-Project Areas(S ection 11, Paragraph 83-a) Does Project Area (project or phase) receive runoff from upland areas? __ No VYes -- Size(s) of area(s) in acres: 1) 1-1-l ~"· 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable ~ concentcated sect;on(s), small cceek (non-cegulatocy), cegulatocy Wateccoucse oc tdbutacy); (' Flow determination: Outline hydrologic methods and assumptions: I ) Does storm runoff drain from public easements or ROW onto or across subject property? --No --1.:'.'.'.'.__ Yes If yes, describe facilities in easement or ROW: FYow, p-ve.v1·.:.0s plAa_s.e._~ ()../V"') ~ .-f?,vov•Y, (,t.t'\de.vr/)l\.Y"ld r1·~ fv ~ def~·ko-v. /':>vi-xi. Are changes in run off characteristics subject to change in future? Explain l'ic. Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property drain across lower:_ properties before reaching a Regulatory Watercourse or tributary? i/' No Yes Describe length and characteristics of each conveyance pathway(s). Includ e ownership of property(ies ). y £'--ft, ..-y V\JJe .. .v-C v o~ S<..--> -K.v.-~o v~VL .:pov-f-,'0y-, of~ Vo~ &o~~ .... , kYcio~- STORMWATER DESIGN GUIDELINES Effective February 2007 Page 8 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ 5 e..,e V<..v, -f-ef• .fi i;, • Po.M-i Z ~cJ~s · t v-.e. L~tecl -eJ...lM 6-;b SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~erty Characteristics I Continued (Page 3.4) Hydr<?logic Attributes of Subject P.roperty (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 v ti.(. a.vi -f -(}vV\t·I e "&f,:; ~-' L~ If teuv-1 of -!ks & vevei:-1/ cfeve_'rw-e..,._;:/. Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds , etc). ik_ (.,v.-\vevh ~ ~ ~k.t. ~t-~ ~,IN') cf ft<ie.,y_w,-~ftt--AvZr.~ Jj(,l..~ f-o ~) -)e-velo~ ~0-.v-{ evl'<u..J y ~ ~>trv<-J-~. Nearby Drainage Do any of these have hydrologic or hydraulic influence on proposed stormwater Facilities design? _L_ No --Yes If yes, explain: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I 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. ·"Dt7l·h~d 1\ frwvf'.d ~oVY' Je,,vJtfW'e-vd-d-q;v.c"'""'vs p~S of -J'lw\ s,,cbJ,i v I"''""' !his plo a.u ·\\e. s ll>'rio i1i 0Y-<;·~ "" -Si'7f~VV1':> tVlru,J1 ~ f{~~' tt-v--tA ~oV\._--h~ 1o Mov-{ --fi...t_ "'-lcvf"-"- .w ~e)--®n'17v1 -f c;._{A,Ld-1e.'=> .iureM~ 'IV'-~. Discharge(s) To Lower Property(ies) (Section 11 , Paragraph E1) Does project include drainage features (existing or future) proposed to become public via platting? --No ./Yes Separate Instrument? v No Yes Per Guidelines reference above, how will ~ Establishing Easements (Scenario 1) runoff be discharged to neighboring __ Pre-development Release (Scenario 2) property(ies)? Combination of the two Scenarios -- Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit # ) Se e Pr-e Lt ......,'"".......... r ( "-I f C.!+n) f.. "'-.<..--}. ·,,__.__ ,J . .,,_..__ :, (lcv-<.,.f.-..... vh:.,.., ., .•. J9 1 L v..-d<-v-ti p!c.-ttGJ 0-<-4'-I~~~ ~~ i:.-{"-"'-~.f.. J ~\..';..{.~ ) Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit# ) ii r;_e of' f.e*flv<t_.,-'f ~ del~~~~.,, r o.J,, 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. Ni> ~c~~ 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 Effective February 2007 Page 10 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I 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 µ(A between Basins or between What design and mitigation is used to compensate for increased runoff Watersheds? from gaining basin or watershed? ___L_ No --Yes JJ/A- How will runoff from Project 1. __ With fa cility(ies) involving other development projects. Area be mitigated to pre-2. __ Establishing features to se rve overall Project Area. development conditions? Select any or all of 1, 2, 3. ___IL:_ On phase (or site) project basis within Project Area. and/or 3, and explain below. 1. Shared facility (type & location of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit# ) µ/+ 2. For Overall Project Area (type & location of fa cilities): (Attached Exhibit# ) µj4 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent questions of th is Part. Are aquatic echosystems proposed? _JL::._ No --Yes In which phase(s) or project(s)? C'-· -0 Q) en c Q) c >-Are other Best Management Practices for reducing stormwater pollutants proposed? ~ (l_ No / Yes Sucnmarize type of BMP and extent of use: en ----c i-iJk 0 t°h,V\-1 d, s,.u._L~ d. (J) en ~ l t -f .e.-v-.o . , t--I bdl...{!..__ t.'N c.J-evv>->J Q) 0 0 z 11 If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain in later questions. ~ --Detention elements --Conduit elements --Channel features <( Swales __ Ditches __ Inlets __ Valley gutters __ Outfalls -- --Culvert features __ Bridges Other STORMWATER DESIGN GUIDELINES Effective February 2007 Page 11 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters j Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi-Phase Project (continued) Will Project Area include bridge(s) or cul vert(s)? __ No~ Yes Ident ify type and general size and In which phase(s). ·30" ~ ~ 11 :..,.. P"1e>-SL ~ 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): "/J-Jt, ph-'-~ of dcve lc.p>-ne-r.t Hi?_;, 1'.-.f-o f'k e)Ll'(;.j.'.,, sf.v.,.,.., ;_y sf~m5 con5~£...f--e~i ""''.'-n: ~v:vi'o _s plt>"'-S-R.S · (~u...nfiJ_//.H..q-,,_, ?lirccf.l) f-p dlf'1-v>tilh--~tl.i.fiq V1r-C.Vi~~..u--Ji/-ft.-..e_ Sto •-v,,-, p1·p ~yste m CO-.,, ~ <:...J-(Ja..v-.d...ul w,k fi.,._~_g ch .,-<kp ~ · Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier analysis and report for larger area? ~Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics . C'· CJ <lJ !/) !/) =i <lJ !/) >- <lJ I ..c. .g CJ <lJ CJ 0 !/) z !\1 <( Typical shape? I Surfaces? Steepest side slopes: Usual front slopes: Usual back slopes: Flow line slopes: least ____ _ Typical distance from travelway typical ___ _ greatest. ___ _ (Attached Exhibit# ) Are longi tudinal culvert ends in compliance with B-CS Standard Specifications? ___ Yes No , then explain: At intersections or otherwise, do valley gutters cross arterial or collector streets? ./ No __ Yes If yes explain : Are valley gutters proposed to cross any street away from an intersection? ./ No __ Yes Explain : (number of locations?) STORMWATER DESIGN GUI DELINES Effective February 2007 Page 12 of 26 APPE NDIX. D TECH. DESIGN SUMMARY As Revised ----- SECTION IX AP PENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceQt and Design Parameters I Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes: Least ({) • f.J. 0 Lo Usual l-lY& · Greatest 1-11<)/i Are inlets recessed on arterial and collector streets? v Yes No If "no", --identify where and why. Will inlets capture 10-year de/n stormflow to prevent flooding of intersections (arterial with arterial or collector)? Yes __ No If no, explain where and why not . C'-· -0 Q) Cf) Will inlet size and placement prevent exceediy allowable water spread for 10-year :J ..._ 2 design storm throughout site (or phase)? _·_Yes __ No If no, explain. -s Ol -a ~ c -0 ro w Sag curves: Are inlets placed at low points? / Yes No Are inlets and ..c ~ -- --..._ ·-conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? :J -u c __L Yes No Explain "no" answers. 0 ..c u ---~ ·3 Cf) a:; ~ u; ~ Will 100-yr stormflow be contained in combination of ROW and buried conduit on <{ whole length of all streets? v Yes No If no, describe where and why. -- Do designs for curb, gutter, and inlets comply with 8-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. C'-· -0 Pipe runs between system I Typical "!:. l oO f'.'.1 ·io1 . '1 r::-r Q) Longest Cf) Cf) access points (feet): :J Q) E >-~1 Are junction boxes used at each bend? V Yes --No If not, explain where and why. Cf) c ·-0 ~z -0 I § 0 Are do/stream soffits at or below upstream soffits? Least amount that hydraulic u; .!!!. Yes __ No __ If not, explain where and why: grade line is below gutter line (system-wide): -f O.T) STORMWATER DESIGN GUIDELINES Effective February 2007 Page 13 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.5) Stormwater Management Concept (continued) Wi thin Or Serving Subject Property (Phase, or Site) (continued) C'· Ill a:; Ill QJ u c ro iii c ~ Ill ~ QJ ~ >- "'O QJ 0 lllZ :::J I iJI Ill QJ ~ Ill ~ 5 0 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? Sov---K--Li ck-[~u,,\L \110 -~ ') _q -fr~ V10 ·:..J .lf?S 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 receiving and all facilities at juncture? 1)--pf~ o.{ ~~~-py-<=f - 2) 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): Flow line slopes (minimum and maximum): Outfall characteristics for each (velocity, convergent angle, & end treatment). Will 100-year design storm runoff be contained within easement(s) or platted drainage ROW in all instances? __ Yes __ No If "no" explain: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 14 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) I (/) Are roadside ditches used? _!L_ No __ Yes If so, provide the following: /,/{ff a.> Is 25-year flow contained with 6 inches of freeboard throughout? __ Yes __ No ..c ~ Are top of banks separated from road shoulders 2 feet or more? __ Yes --No 0 Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No a.> -----0 For any "no" answers provide location(s) and explain: (/) -0 C1) 0 a:: If conduit is beneath a swale, provide the following information (each instance). ti/A Instance 1 Describe general location, approximate length: ' (/) a.> >- 1~ Is 100-year design flow contained in conduit/swale combination? --Yes --No If "no" explain: c 0 C1) z Vi Space for 100-year storm flow? ROW Easement Width 11 ~ Swale Surface type, minimum Conduit Type and size, minimum and maximum .Q and maximum slopes: slopes, design storm: ('-· -0 (/) -0 a.> C1) c >-Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c C1) c ..c C1) u ~ c .£ a.> c a.. 0 0 ·-Access Describe how maintenance access is provided (to swale, into conduit): 0 C1) :::J § a.> .£ -c c a.> -0 E Instance 2 Describe general location, approximate length: a.> C1) (/) (/) :::J (/) a.> c :!2 0 > Is 100-year design flow contained in conduit/swale combination? Yes No :;:o e ----C1) If "no" explain: c a. :a Q) E a.> 0 ..c Space for 100-year storm flow? ROW Easement Width u (/) ·-2 Swale Surface type, minimum Conduit Type and size, minimum and maximum :::J ~ -0 and maximum slopes: slopes, design storm: c C1) 0 a. u a.> ]! (/) Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): C1) c 3 ~ (/) a.> :t: 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 ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Pa rameters I Continued (Page 4.7) Stormwater Management Concept (c ontinued) Wi thin Or Serving Subject Property (Phase, or Site) (continued) c rn E ~ gw If "yes" provide the following information for each instance: f\J /A Instance 1 Describe general location, approximate length, surfacing: 15 V) Is 100-year design flow contained in swale? __ Yes __ No Is swale wholly c ~ within drainage ROW? __ Yes __ No Explain "no" answers: .; I f----------------------------------i o Access Describe how maintenance access is provide: ~ 0 ~z ~ A,__ ______________________________ ---< ~ v I Instance 2 Describe general location, approximate length, surfacing: cu ·c C'-· ::i V) .D c 5 cu o E :5 ~ ·3 ~ V) .._ cu 0 ~ s V) 0 = 0::: ~ 0 ::0 ::i a. 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 fl~ be channelized (deepened, widened, or straightened) or otherwise altered? -~-t\ No __ Yes If only sl ightly ('-shaped , see "Swales" in this Part. If creating side banks, provide information below. ~ c f-------------------'-------'---------------l V) rn Will design replicate natural channel? __ Yes ___k'.'.'.:_ No If "no", for each instance 0 Ci. a. x describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year ~ w design flow, and amount of freeboa;d . ~ < Jt f1, l r · -k.. 2 ~ Instance 1 tk.~ Ne -s wdl J,i'7t-~4e \"'-..::»v . ·...-.il."f l-.tc..... I ·A (xv.X.. . .1\-\ d,AAnt~Yi0li&s ve. a~ fi,Uow 5 · v I Instance 2: lJ/!>-slo~ ~l 0 · 4ra , . {. . . . o) I ~ ,-Io' 'fS,o-tto.....-.. w ~J-H., +~.:cvu:l J ~c~ ~ I Jt f-) : \I( ~'t·k ~Jo~ ~ j Instance 3~1 /1., " J u rv /'' io..~ -L.l~Cl STORMWATER DESIGN GUIDELINES Effective February 2007 Page 16 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels (small creeks): Are these used? v 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: t' /A For each location, describe length and general type of proposed improvement (including floodplain changes): tJ I A For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year design flow. 'O ~/A (!) ::J c c Watercourses (and tributaries): Aside from fringe changes, are Regulatory 0 Watercourses proposed to be altered? _L_ No Yes Explain below. ~ -- (f) c Submit full report describing proposed changes to Regulatory Watercourses. Address (!) existing and proposed section size and shape, surfaces, alignment, flow line changes, E (!) length affected, and capacity, and provide full documentation of analysis procedures > e and data. Is full report submitted? Yes No If "no" explain : 0. -- E -rJ i~ -(!) c c ro All Proposed Channel Work: For all proposed channel work, provide information .r::. u 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. ~/A Will 100-year flow be contained with one foot of freeboard? ./ Yes --No If not, identify location and explain: Are ROW I easements sized to contain channel and required maintenance space? _.:L_ Yes __ No If not, identify location(s) and explain : C,o.vAvu.J-l.) ~w ~l~ ~e-"'*. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 17 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ----- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I 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 volum e + 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: <fl Q) >- JI For each facility what is 25-yr design Q , and design of outlet structure? 0 Facility 1: z I Facility 2: Do outlets and spillways discharge into a public facility in easement or ROW? C'-· Facility 1: __ Yes No Facility 2: Yes No -0 ------Q) If "no" explain: <fl 0 0.. e 0.. <fl For each, what is velocity of 25-yr design discharge at outlet? & at spillway? Q) ·-Facility 1: & Facility 2: & -·0 C1l Are energy dissipation measures used? No Yes Describe type and LL ----r: location: 0 c Q) a:; 0 Q) ~ For each, is spillway surface treatment other than concrete? Yes or no, and describe: Facility 1: Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Facility 2 If berms are used give heights, slopes and surface treatments of sides. Facility 1 Facility 2: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 18 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ ~-ee "f)<j-.uJ-)· .,., \)o"'d 2 M~<,1'<, f,v-4i,, ·vi,c SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continued (Page 4.10) Stormwater ~anagement Concept (contin~ed) 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; (/) <IJ :;J ~~ ~ <IJ Facility 2: LL ::::i c c . ..,, 0 c :.;::; 0 c u <IJ ~ a; For additional facilities provide all same information on a separate sheet. 0 Are parking areas to be used for detention? __ No --Yes What is maximum depth due to requ ired design storm? 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: C'-· (/) OJ c (/) Are culverts parallel to public roadway alignment? (/) Yes No Explain: e ---- u (/) <IJ <IJ >--ro I > ·;::: Creeks at Private Drives: Do private driveways, drives, or streets cross drainage o._ -ro ways that serve Above-Project areas or are in public easements/ ROW? -0 0 No Yes If "yes" provide information below. <IJ z ----~11 How many instances? Describe location and provide information below. <IJ Location 1: .2 ::::J u <IJ Location 2: ~ Location 3: For each location enter value for: 1 2 3 Design year passing without toping travelway? Water depth on travelway at 25-year flow? Water depth on travelway at 100-year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 19 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ----- SECTION IX AP PENDIX D -TECHN ICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.11 ) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulato!'.:Y 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? Q) <ll No Yes How many instances? For each identify the ..c rJJ ---- 2 location and provide the information below. rJJ C1l Instance 1: <ll '-->-~ I~ Instance 2: Instance 3: c 0 0 ·~ z E Yes or No for the 100-year design flow: 1 2 3 'I~ Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? E C'-· C1l Is velocity limited per conditions (Table C-11)? rJJ rJJ gi "O Explain any "no" answer(s): ·-c ~ C1l 0 c '--0 u ·.;::; >-C1l C1l u 3 .2 "O <ll C1l ..c Minor Collector or Local Streets: Will culverts serve these types of streets? 0 ·-'--'--u u No Yes How many instances? for each identify the ·-rJJ -<ll -----g "O location and provide the information below: 0.. <ll ~ 0.. Instance 1: ro:c "O >-Instance 2: <ll c ~ C1l rJJo Instance 3: t:'. rJJ <ll <ll 2 u For each instance enter value, or "yes " I "no" for: 1 2 3 ::l c u C1l Design yr. headwater WSE 1 ft. below curb top? <ll u; '--c <( ·-100-yr. max. depth at street crown 2 feet or less? ~ 0 Product of velocity (fps) & depth at crown (ft) = ? E '--g Is velocity limited per conditions (Table C-11)? Limit of down stream analysis (feet)? Explain any "no" answers: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 20 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I 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: 'O Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? QJ ::i No Yes If "yes" identify location(s), describe outfall design treatment(s): c ----c 0 u t/) t QJ .?. ::i 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): 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 Effective February 2007 Page 21 of 26 APPENDIX. D TE CH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I 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? ___L_ 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? ~ Q) Ol -0 ·;:: 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: Is a Stormwater Provide a general description of planned techniques: .£ Pollution Prevention -Plan (SW3P) C1l ~ Ov-{A0-ll Pla_V\ ( ~r J-J of ::i a established for ~ project construction? Q) co "'s+r-v.. c.-h ""' Dr-~ ....... ,tj;~ ,, • -ro s --No _:L_ Yes 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? _LNo --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? tJ 1~ STORMWATER DESIGN GUIDELINES Effective February 2007 Yes ---- Page 22 of 26 No If "no" explain: APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4 .14) Stormwater Management Concept (continued) I Within Or Serving Subject Property (Phase, or Site) (continued) tJ /Pt Special Designs -Deviation From 8-CS Technical Specifications l 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 v Yes No Is a map(s) showing all Design Drainage Areas provided? ---- Briefly summarize the range of applications made of the Rational Formula: ,~ f ( --1.-?\-V' .. J.A·(">)~ 11 ... fo.S ~~~d. (~ D-~+~~-t-;~·:P~\ L ~~ ...... ·~) wr..> ~) ~ s,--t'o.V\) r'·f-<-.. t 1'v..l<-h. \2._iiJ;~oJ ,,~.,,; What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? £1. ~1 acres STORMWATER DESIGN GUIDELINES Effective February 2007 Location (or identifier): flvei;1.. t/Aaii,...L'vvj -ft> f1{x.. 33 Page 23 of 26 APPE NDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceQt and Design Parameters I 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? [QQ % 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 µ/A. "'1/A Storm drain system for local streets 10 ~ 100 (.0 Open channels ;o ·~ ·1ov IU Swale/buried conduit combination in lieu of channel ~ - Swales --- Roadside ditches and culverts serving them -- Detention facilities: spillway crest and its outfall (00 too Detention facilities: outlet and conveyance structure(s) 100 100 Detention facilities: volume when outlet plugged /00 /00 Culverts serving private drives or streets -- Culverts serving public roadways -- Bridges: provide in bridge report. -- Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit Culverts Swales Channels Highest (feet per second) q I{) Lowest (feet per second) S -I Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For street gutters: For conduit type(s) HTff ~Pf STORMWATER DE SIGN GUIDELINES Effective February 2007 Page 24 of 26 0.014- Coefficients: o.o/Z APPENDIX. D TECH. DESIGN SUMMARY As Revised ----- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I 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? .L__ No __ Yes Head and friction losses _L__ No Yes -- Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? /Yes --No Are elevation drops provided at inlets, manholes, and junction boxes? _L_ Yes --No Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? ___:::!:___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: Ft.. ov \ l~10 ~ s.~') t+· (PAA~ Wc.hl\.~~AU Z.40 .~2--24?>4 -~·1) \.._.hou .:. ~-COS\)'. (w..."'~ W"'-t~~""~"~2'1!.~2. -Z..<Qll .\:.7) it It:.. Open Channels If a HEC analysis is utilized, does it follow Sec Vl.F.5.a? 'L Yes __ No Outside of straight sections, is flow regime with in limits of sub-critical flow? __ Yes __ No If "no" list locations and explain: fJ 1~ I Culverts If plan sheets do not provide the following for each culvert, describe it here. tJ /A For each design discharge, will operation be outlet (barrel) control or inlet control? Entrance, friction and exit losses Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Effective February 2007 I tJ /~ I Page 25 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ----- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software has been used in the analysis and assessment of stormwater management needs and/or the development of facility designs proposed for subject property project? List them below, being sure to identify the software name and version, the date of the version, any applicable patches and the publisher HEc-1- £)tJ sp(~cJsivJ pyo~~ 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 111 , Parag raph 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 Desiqn Summary Drainaqe 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 reqwred by any and all state and federal regulatory agencies for the prnoa..QQiJ.i,,cJ.rainage ~-"""'""''"IJ,. improvements /1 ave been issued or fall under applicable general permit~ i'E. OF /£-,:~~\ F ~l'-.0 oeo 00 -'-"fi5' ~ ~-l/ (Affix seal) /Ez_.:.·· "/:-" ·~.~~ ~~t -=·.-. ___ ;:~ N.t: .... ::::'-. :_:(:-t·~ Licen _d_Pr fessional Engineer lf GINGch •-!_.1h i::>O 9. l ·~··.:···a95;33-··::;J StateofTexasPE No. :22t)D3 . ··!/co~s'i:...~·~1lfH '{LL .o.! • • Q • • • -n"::" ~ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 26 of 26 APPENDIX. D TECH. DES.IGN SUMMARY As Revised ----- Dove Crossing Subdivision -Phase 8 Drainage Area Summary Area, A c le 5 year storm 1 O year storm 25 year storm Area# Is Os 110 (acres) (min) (in/hr) (cfs) (in/hr) 300 0.61 0.55 10.0 7.693 2.58 8.635 ---· -------304 0.44 0.55 10.0 7.693 1.86 8.635 ----·-----304A 0.27 0.55 10.0 7.693 1.14 8.635 ---------·----305 0.44 0.55 10.0 7.693 1.86 8.635 ---·--------------308 1.24 0.55 10.0 7.693 5.25 8.635 ----------· ·-800A 1.49 0.45 17.2 5.943 3.98 6.719 ----------------8008 1.10 0.45 16.6 6.054 3.00 6.841 ·--------------801 0.46 0.55 10.0 7.693 1.95 8.635 -·---------------·--· 802 0.41 0.55 10.0 7.693 1.73 8.635 ----------------803 0.32 0.55 10.0 7.693 1.35 8.635 --·----------------804 0.90 0.55 10.0 7.693 3.81 8.635 -------------805 0.30 0.55 10.0 7.693 1.27 8.635 -----------------·--------806 1.45 0.53 10.0 7.693 5.91 8.635 ------------807 0.34 0.55 10.0 7.693 1.44 8.635 ------·-------808 1.27 0.55 10.0 7.693 5.37 8.635 ---· ---------809 0.66 0.55 10.0 7.693 2.79 8.635 -.. --·---810 0.42 0.55 10.0 7.693 1.78 8.635 ---- ------------ 811 0.89 0.55 10.0 7.693 3.77 8.635 ----· --------812 0.22 0.55 10.0 7.693 0.93 8.635 ---------------813 0.47 0.55 10.0 7.693 1.99 8.635 -----------814 0.79 0.55 10.0 7.693 3.34 8.635 ---·----------------815 0.45 0.55 10.0 7.693 1.90 8.635 ---------------816 1.48 0.55 10.0 7.693 6.26 8.635 -· -------·-------817 2.07 0.55 10.0 7.693 8.76 8.635 ·---------------818 0.16 0.55 10.0 7.693 0.68 8.635 -- ----------------·-819 0.43 0.55 10.0 7.693 1.82 8.635 ------------------820 0.38 0.55 10.0 7.693 1.61 8.635 -----------------· ·-· 821 1.01 0.55 10.0 7.693 4.27 8.635 The Rational Method: Q = CIA I = b I (tc+d)" Q = Flow (cfs) A= Area (acres) le = Time of concentration (min) C = Runoff Coeff. I = Rainfall Intensity (in/hr) Brazos County: 5 year storm b = 76 d = 8.5 e = 0.785 10 year storm b = 80 d = 8.5 e = 0.763 25 year storm b = 89 d = 8.5 e = 0.754 0 10 l2s (cfs) (in/hr) 2.90 9.861 ------· 2.09 9.861 --·--1.28 9.861 2.09 9.861 ---·--5.89 9.861 -----4.51 7.697 ---- 3.39 7.835 --2.18 9.861 ----------1.95 9.861 ------1.52 9.861 -----4.27 9.861 ------1.42 9.861 ·----6.64 9.861 -----1.61 9.861 ---6.03 9.861 -----3.13 9.861 ----1.99 9.861 -- 4.23 9.861 -----1.04 9.861 ---2.23 9.861 --·-3.75 9.861 -··----2.14 9.861 ---7.03 9.861 ---9.83 9.861 -----0.76 9.861 ---·---· 2.04 9.861 -·----1.80 9.861 -----4.80 9.861 tc = L/(V*60) L = Length (ft 0 2s (cfs) 3.31 2.39 --1.46 ---2.39 ·-6.73 ---5.16 ----3.88 ---2.49 ---2.22 ---1.74 ----~ 4.88 --- 1.63 ----7.58 -1.84 ---6.89 ---3.58 ---2.28 ------4.83 -·-1.19 2.55 ---4.28 ·---2.44 ---8.03 '----11 .23 0.87 ------2.33 -·-·-2.06 --5.48 V =Velocity (ft/sec) 50 year storm b = 98 d = 8.5 e = 0.745 50 year storm 100 year storm lso Oso 1100 0100 (in/hr) (cfs) (in/hr) (cfs) 11 .148 3.74 11.639 3.90 ------11 .148 2.70 11.639 2.82 ·----- 11 .148 1.66 11 .639 1.73 ---· 11 .148 2.70 11.639 2.82 -----11 .148 7.60 11 .639 7.94 --·-----· ·-8.726 5.85 9.104 6.10 -·-------------8.881 4.40 9.266 4.59 ----------- 11 .148 2.82 11.639 2.94 --· -------11 .148 2.51 11.639 2.62 -----------11.148 1.96 11 .639 2.05 --·---------------11.148 5.52 11 .639 5.76 ----------·--11.148 1.84 11 .639 1.92 ·--------· ---11 .148 8.57 11 .639 8.94 --· -·----11 .148 2.08 11 .639 2.18 -------11 .148 7.79 11 .639 8.13 -------11 .148 4.05 11 .639 4.23 ---11 .148 2.58 11 .639 2.69 --------· 11 .1 48 5.46 11 .639 5.70 -----· -- --11 .148 1.35 11.639 1.41 -----· -11.148 2.88 11 .639 3.01 ------------11 .148 4.84 11 .639 5.06 ---------·-------11 .148 2.76 11 .639 2.88 -------------11 .148 9.07 11 .639 9.47 --------11 .148 12.69 11 .639 13.25 ---------11 .148 0.98 11 .639 1.02 ---------11 .148 2.64 11 .639 2.75 -----------·---11 .148 2.33 11 .639 2.43 -------11 .148 6.19 11 .639 6.47 100 year storm b = 96 d = 8.0 e = 0.730 Dove Crossing Subdivision Phase 8 Depth of Flow in Gutter (Refer to Exhibit A for Gutter Locations) Gutter A Location Area# (acres) Ph 3-4 D6A 313. bypass D4 0 27 Ph 3-4 D6B 311a.312.313, bypass D4 1 19 P/1 3.4· DB 311,316,317,bypass D68 I Bl Ph 3-4: D9 314.315,31B.bypass D5 I 63 Ph 3-4: D10 316.317.bypass DB I 94 Ph 3-4: D11 31 B.bypass D9 062 Ph l:E3 225. bypass E 1 0 17 Ph t:E4 226,22B. byp E2 1.34 Ph 3-4: El 324. E3 flow 0.56 Ph 3-4: EB 323.bypass E1 1(1-109AJ 1.09 Ph 3-4: E9 320,bypass E13(1-127) 045 Ph 3-4: E10 319,bypass E12(1-12BJ 0.77 Ph 3-4: E11 226.22B.325.byp E2 (1-109) I B5 Ph 3-4: E12 322.323,bypass £110-1Q9A) 2 21 Ph 3-4 E13 225.324.321.bypass E1 I 14 Ph 3-4 G5 306 0 74 Pli 3-4· G6 310. Bypass 1-122 1 22 Ph 3-4: Gl 307 0 53 Ph 3-4 GB 310A I 95 G9 224 .238.300 t 48 G10 800A 1 49 Gll 305 0 44 G12 801 0 46 G13 8008 1 10 Ph 3-4 H1 308 I 24 H2 308 1 24 H3 813 0 47 H4 814 0 49 H4 304A.812 0 49 H6 304A.812 .portion of 815 0 63 Kl 811 0 89 K2 808 1 27 K3 810 0 42 Kd 809 0 66 KS 821 1 01 K6 820 0 38 K7 819 0 43 K8 818 0 16 L 1 805 0 30 L2 pon1on of 806 0 91 L3 805. portion of 807 0 46 L4 pon1on of 806 1 20 10-year storm c Slope le 1., a., Y10-K1uait (tuft) (min) (in/hr) (cfs) (ft) (in) 0.55 00200 100 B 635 1 2B 0.169 2.03 0 55 0.0220 100 B 635 5 65 0.290 3.4B 0.55 00170 100 B 635 B 60 0 356 4.27 0.55 0.0170 10.0 B 635 B 23 0.350 4.20 0 55 0.0170 10.0 B 635 9.21 0.365 4.3B 0.55 0.0170 100 B 635 2.94 0.23B 2.B6 0.55 0.015() 10.0 B 635 OB1 0.155 1.Bl 0.55 0.015() 13.2 7.645 5.63 0.322 3.Bl 0.55 O.OIBO 10.0 B.635 3 47 0.250 3.01 0.55 0.01BO 10.0 B.635 5_ IB 0.291 3.49 - 0.55 0.0104 10 0 B.635 2 14 0.232 2.lB 0.55 0.0104 100 B.635 4_07 0.295 3.54 0.55 0.01BO 10.0 B 635 B 79 0.355 4.26 0.55 O.OIBO 100 B.635 10 5() 0 379 4_5() 0 55 0.0180 10.0 B 635 5 41 0.296 3_55 0.55 0.0080 10.0 B.635 3 51 0 293 3.52 0.55 0.0074 21.2 6 017 4.04 0.313 3.76 0.55 0.0080 10.0 8 635 2 52 0 259 3.10 0.55 0.0074 21.2 6 017 6 45 0 373 4.4B 0 55 0.0080 10 0 8 635 7 03 0 380 4 56 - 0 45 0.0080 17 2 6 719 4 51 0 322 3.86 0.55 00080 10 0 8 635 2 09 0 24 1 2.89 0 55 00080 10.0 8 635 2 18 0 245 2 94 0 45 0.0080 16.6 6 841 3 39 0 289 3 47 0.55 0.0130 10.0 8 635 5B9 0.325 3_90 0 55 0 0130 100 8 635 5 89 0 325 3PV 0.55 00130 10 0 8 635 2 23 0 226 2.71 055 0 0130 10.0 8 635 2 33 0 229 2 75 055 0 0130 10 0 8 635 2 33 0 229 2 75 0 55 00130 10.0 8 635 2 99 0 252 3 02 0 55 0 0078 100 8 635 4 23 0 316 3 79 055 0.0070 10 0 8 635 6 03 0 368 4 42 0.55 0.0078 10.0 8 635 199 0 238 2.86 0.55 0 0070 10.0 8 635 3 13 0 288 3.45 0 55 0.0070 10 0 8 635 4 80 0 338 4 05 0 55 0 0117 10.0 8 635 1 80 0 213 2 55 0 55 0 0070 10 0 8 635 2 04 0 245 2 94 0 55 0 0117 10 0 8 635 0 76 0 154 1 84 0 55 0 0100 10.0 8 635 1 42 0 200 2 40 0 55 0 0100 10 0 8 635 4 32 0 304 3 64 0.55 00160 100 8 635 2 18 0 215 2 58 0 55 0 0160 10.0 8 635 5 70 0 308 3 70 Gutter Evaluation For Alleys -Using Channel Calculator for Trapezoidal Ditch with 1:12 sides, n=0.014, depth=6'" P/13-4 JI pomon of 308 033 Pt1 3-4 J2 portion of 309 0 52 Pt1 3-4 JJ pa111on of 309 I 00 Pn 3-4 J4 Portion of 304 0 32 Pt1 3-4 J5 portion of 304 0 24 J6 802 0 41 Jl 803 0 32 J8 804 090 Transverse (Crown) slope (ft/ft) 27' street = O 0300 38' street O 0300 0.55 00060 10.0 0 55 0.0060 10_0 0 55 00060 100 0 55 00090 10.0 0 55 00060 100 0 55 0 0060 10 0 0 55 00060 10 0 0 55 00060 10 0 Straight Crown Flow (Solved to find actual depth of flow in gutter, y): Q = 0.56. (z/n). S "2 • y113 <:> y =(Q I (0.56 • (z/n). S112)}311 n = Roughness Coefficient = O O 18 S = S11ee11Guller Slope (fl/fl) Oq ·lt;ql tin\·, ·11111lc1 t II ~'7' !-If! ... , :· ' ' ';b' ~Ill '• I ·· 8 635 I 57 3.02 8 635 2 47 3 5B 8 635 4 75 4 58 8 635 I 52 2 77 8 635 I 14 2 68 8 635 1 95 8 635 1 52 8 635 4 27 100-year storm 1, .. a, .. y,., (in/hr) (cfs) (ft) (in) 11 639 2 50 0217 2 61 11 639 B.39 0336 4 03 11 639 11.63 0.39B 4.lB 11.639 11 96 0.403 4 B3 11 .639 12.42 0 40B 4.90 11.639 5.36 0.29B 3.5B 11.639 1.59 0.201 2.41 10.329 9 20 0.3B7 4.65 11.639 5_ IB 0.291 3.49 11.639 6.9B 0.326 3.91 11.639 4.44 0.304 3.65 11 639 I 1.39 0.434 5.20 11.639 13.43 0.416 4.99 11.639 17.23 0.457 5.4B 11.639 780 0.339 4.07 11.639 4.74 0.328 3.93 8.176 6.19 0.368 4,4 f 11 639 3.39 0.2B9 3.47 B.176 8.77 0.419 5.03 11 639 9.47 0 425 5 10 9.104 6 10 0 360 4 33 11.639 2 82 0 270 3 24 11 .639 2.94 0 274 3 29 9.266 4 59 0 324 3 89 11.639 7.94 0.363 4 36 11 639 7 94 0 363 4 36 11 .639 301 0 252 3.03 11 .639 3 14 0 256 3 08 11 639 3 14 0 256 3 08 11 639 4 03 0 282 3 38 11 639 5 70 0 353 4 24 11 639 8 13 0 41 2 4 94 11 .639 2 69 0.266 3 20 11 639 4 23 0 322 386 11 639 6 47 0 378 4 53 11 639 2 43 0 238 2 85 11 639 2 75 0 274 329 11 639 1 02 0 172 2 06 11.639 1 92 0 224 2 69 11 639 5 83 0.340 4 08 11 639 2 94 0 241 2 89 11 639 7 68 0 345 4 14 11 639 2 11 3 38 11 639 3 33 4 01 11 639 6 40 5 12 11 639 205 310 11 639 I 54 300 11 639 2 62 11 639 2 05 11 639 5 76 Dove Crossing Subdivision Phase 8 Inlet Length Calculations Inlets In sump lnlel • Length flowffo.., A Area# (acres) Phase 8 129 10' 300 0 61 800A 149 130 5' 305 044 801 0 46 133 10' 811 0 89 808 1 27 134 5· 810 0 •2 809 0 66 138 5' 819 0.43 818 0 16 139 5' 821 1 01 820 0 38 l~hase 1 11; ID' 307 053 JJD J 22 Inlets On Grade Inlet• L•nglh Fl-lro"' y,, Are.ii# lftl I Phase 1 JOJ 15' 114 OJ67 102 10' lJl OJlO •01 15· ~·· ,,,,, 11'1~ 0316 ro5 10' 22J 0387 104 IQ' 222 0351 roa 10· 208 0358 '"9 10' 209 OJBI !Qi JO' 218,227 0362 106 5· 217 DJOO [Phase 2 '" 10' 2J4 OJS1 "2 10' 236 0344 ';J 10' 235 0 401 Phases 3 & 4 109A J5' 226.22!.325 0 355 110 10' nr• ~31 nt 0 395 116 10' 306 0 J14 118 10' 308 0 336 122 10' 310A 0 313 123 10' 313 0 295 J24 15' 311.312 0 356 J25 15' 314,315 0 342 127 10' 22S.J2•.J21 0 296 128 15' 322.323 0.379 Phase! 135 5' 8008 0 289 136 JO' 308 0 325 J37 5' 813 0 226 Transverse (Crown) slope (ft/ft) c 0 55 0 45 0 55 0 55 0 55 0 55 0 55 0 55 0.55 0.55 055 055 055 055 (in) 4 JO J" J 80 4 64 4 2J 430 4 57 435 J 60 421 'IJ '81 • 26 475 3 77 • 03 3 76 3 5• 4 27 411 3 55 4 55 3 47 3 90 2 71 for 27' streets = a 030 for 38' streets = 0 030 I a,. Co.-.-· (els) (cfs) I from Inlet• 2 90 4 51 0" 135 2 09 2 18 4 23 603 1 99 3 13 2.04 0.76 4 80 1 80 2 52 5 79 000 J22 a...-a. ..... a..~·· lft) (cfs) (cfs) 067 10 10 ·l 6J 061 6 15 .() 77 062 9 J2 -J04 069 6 94 ·004 066 6 57 ·l 24 066 6 64 .f 03 069 6 88 ·D 26 066 6 62 -OBJ 060 JOO 049 066 6 57 -088 065 6 50 -1 10 D 71 709 088 0 65 9 72 .Q 93 0 69 6 88 0 •3 061 6 08 ·1 85 063 6 29 0 16 0 61 6 07 -2 °" 0 58 5 85 ·O 20 0 65 9 73 ·114 0 6• 9 53 ·1 79 0.59 5.91 ·0.49 0.67 10.08 0.41 0 58 2.92 0.47 062 6 18 ·0.29 0 53 2.63 -0 39 Straight Crown Flow fSolved to find actual depth of flow y): a• o.s6 • (zlnl · s111 • ylf3 .-:i y = {O 110.56 • (zlnl · S111)}311 n = Roughness Coefficient = S • 51reeVGuller Slope (fVft) y = Deplh of flow at inlet (h) Capacity of Inlets on grade: 0c. = 0.7. (1/(H, • H1)]' (H,512· H1$11] Oc = Flow capacity of inlet (cfs) H, =a• y 0018 H: = a= gutter depression (7" S1andard. 4R Recessed) y = Depth of flow 1n approach guner (h) 10 year slorm a, ..... a, ............. Y1&..ci • ...i (els) (cfs) (ft) I (in) 2 90 319 0.220 2.65 4 97 5" 0.270 3.24 2 09 2 30 0 195 2 34 2 18 240 0 198 2 38 423 • 65 0 254 3 05 6 03 6 63 0.290 348 1 99 2 19 0 192 2.30 3.13 345 0.227 2.73 204 2.25 0.193 2 32 0 76 0.84 0.133 1 60 •.80 5.28 0.266 3 20 1 80 1 99 0 185 2.22 252 2 77 D 209 251 5 79 6 J7 0 286 J 4J tu year storm a. .•• ~ I Cle.,,., ...... 0i... ....... 1 1e1s1 I (cfs) from Inlet# (cfs) 8 47 000 5 JB 000 618 000 102, 103 000 6 90 000 5 JJ 000 5 6J 000 6 62 000 5 79 000 J {)() D 49 5 68 088 11J 000 5 40 000 709 088 8 79 0 00 109 0.00 6 88 0 00 Ill 11?1().l IOS 0.4J 4.23 000 6 29 0 16 '°" 000 5 65 000 107 0 00 8 60 000 123 0.00 7" 0 49 106 0 00 5.41 0 {)() 108 0.00 10.08 0.00 109A 0., 2.92 0 47 5 89 000 2 23 0.00 136 0.00 z = Reciprocal of crown slope for 27' streets = 33 for 38' streets = 33 100 yeu slorm L,...., .... .,· L,~"'"""' a, .. <l.-.~-I a,,,.., (ft) lft) (cfs) {cfs) I from inlet •I (cfs) 6 48 10 3 90 6.10 1 50 3 52 5 2 82 2.94 8.45 10 5.70 8.13 422 5 2.69 4.22 2.31 5 2.75 1.02 544 5 6.47 2.43 6 85 10 3 39 78J 000 uswoty~,.•T"•OW' I Cl..:.ro-• a,(l.T,,.,,, I .... I (cfs) (cfs) I (ft) linl I 8 47 8 47 0412 494 5 JB 5J8 OJ47 4 J6 6 28 6 28 0358 430 6 90 6 90 0434 5 21 5 3J 5 JJ 0393 471 5 61 56J 0401 4 8J 6 62 6 62 0 427 5 12 5 79 5 79 D 406 4 87 J {)() J 49 0335 4 02 5 68 568 0449 5 J9 5 40 5 40 0385 '62 709 7 97 0450 5 40 8 79 8 79 0.416 499 6 88 7 31 0 582 6 99 423 '23 0 368 . ., b ?9 6 45 0.377 4.52 '°" • 04 0 377 '52 5 65 ) "5 0.342 ' 10 8 60 8 60 0.425 5 10 77• 7" -0.403 483 5.41 5.41 0.339 4.07 10.08 10.50 0.457 5.48 2.92 3 39 0.324 3.89 5 89 5 89 0.363 4.36 -· 2.23 2.23 0.291 3.49 Inlets In sumps Weir Flow: L • Q / (3 'y"') '"° y • (0 I 3LJ"' L = Length of inlet opening (ft) 0 = Flow at inlet (cfs) y = total depth of now on inlel (h) max y for 1nle1 1n sump = T' = O 583' 3 90 135 7 60 2 82 2 94 5 70 8 13 2 69 • 22 2.75 1.02 6.47 2 43 3 J9 J22 7 8J a,..._ Q..."'°"•v (ft) (cfs) 072 1080 065 6 52 066 9 9J D 74 744 D 70 7 OJ D 71 7 09 D 74 7 36 D 71 707 D 6J J" D 70 702 069 6 92 0 76 7 61 0.69 10 35 0 80 8 03 0 64 644 0.67 6.70 0.66 660 0 62 6 18 0 69 10.36 0.68 10.13 0.62 6.25 0.72 10.77 0.62 3 09 0.66 6 56 0 55 2.75 a ...... ~. I y, .. 1e1s1 I (ft) '30 0 563 8.36 3 10 0 563 3 2• 6 27 0.636 8.9• 2.96 0636 4.65 3.03 0.425 113 711 0 752 2 68 J 7J 0553 8 59 100 year storm a..~ .. a., •• ~ I (cfs) (cfs) I D 71 1080 D 76 6 52 ., J7 8 54 J 92 744 D 20 7 01 050 7.09 J 59 7 J6 0 77 707 I 53 J" D 7J 7 oz DJ6 6 92 J 22 762 1.49 10.35 6 04 8 03 ·O 75 5 70 2 07 6.70 -0 42 6.19 144 6.18 1 22 10.36 0 30 10.13 1.05 6.25 3.38 -1-0.77 1.50 3.09 1 38 6.56 0.26 2.75 (in) 6 75 6.76 7.63 7 63 5.10 9 03 6 6J I a. ... -.. I a..~-· a. ...... Ornu.,..,., s l..,,.,.., (cfs) from Inlet #I (cfs) (cfs) (cfs) (ft/ft) (ft) 0 71 10 80 II 52 00140 15 0 76 6 52 729 00140 ID 1 47 102, 103 D 10 8 64 8 75 00170 15 I 92 7 44 9 J6 00070 10 -D 20 701 7 2J 0 0070 10 D 50 709 7 59 0 0070 10 J 59 7 J6 8 95 00070 ID 0 77 7 07 7 84 00070 10 1 53 J" 4 71 00070 5 J 22 11J 395 702 IQ 96 00080 10 OJ6 6 91 728 00080 10 J 22 7 62 10 84 00077 10 1.59 109 3 08 10 35 13.43 0 01&0 15 6 43 1111121().llOS 12 47 8 03 20 50 0 0070 10 0 00 644 6 44 00080 10 2 07 6 70 8.77 00130 10 0 {)() 6 60 6 60 0 0074 10 0 77 107 2 21 6 18 8.39 0.0200 10 2.21 123 3.44 10 36 13.80 0 0170 15 -1 53 106 1 84 10 13 11.97 0.0170 15 -1.56 6.25 7.80 0 0180 10 a.so_.-~ 3.08 109A 6.46 10.77 17.23 0.0180 15 1.50 3.09 4.59 0.0080 5 1.38 6.56 7.94 0.0130 10 1 38 136 1.64 2.75 4.39 0 0130 5 Dove Crossing Subdivision Phase 8 Grate Inlet Calculations Q = 4.82 * A9 * y 112 ¢ y = (Q I (4.82 * A9))2 Where: Q = flow at inlet, cfs Grate Inlet Number Ag = open area of inlet, ft2 y = depth at inlet, ft Contributing Drainage Grate Area# Size Grate Type 131 802,803,804 2-24"x36" V-5760 EJIW Grate Opening Actual Ag (from Manufacturer) (in') I !ft'l 826 I 5.7 Design A0 10-Year Storm 100-Year Storm 25% clogging a,. Depth, y 0 100 Depth, y (ft') (cfs) (ft) I (in) (els) (ft) I (in) 4.3 7.74 0.14 I 1.7 10.43 0.25 I 3.0 Dove Crossing Subdivision Phase 8 Pipe Summary Pipe Pipe Length Slope Contributing Area Size No. Numbers (in) (ft) (%) 33 36 160.0 0.85 300.305.BOOA.BOOB,801.803.804. 802.808,811.809.810.2~.?24 34 36 31 .0 0.60 300.305.BOOA.8008.801.803.804, 802,B~.1)_1_1_1.38,224 _ 35 30 132.5 0.80 300.305.BOOA,8008.801.803,804. 802.238,224 300.305.BOOA.8008.801.803.804, 36 30 104.5 0.80 802.238.2]4 37 30 132.0 0.60 300.305.800A.800B.801,238.224 38 30 31 .0 0.40 300.800A.800B.238,224 -39 24 201 9 0.80 BOOB 41 2-36 165.7 1.00 308.820.821.818, 819.Previous fhfileS 42 2-36 96.4 1.20 308.Previous Phases 43 30 60.0 0.30 820.821.818.819 Contributing Tc 110 Area (acres) (min' (in/hr) 9.84 18.4 6.49 -- 8.76 18.4 6.49 --------- 6.60 18.4 6.49 - 6.60 18.4 6.49 --· 4.97 18.4 6.49 ---4.07 18.4 6.49 --· --1.10 16.6 6.84 3.22 26.9 5.26 --1.24 26.9 5.26 -- 1.98 10.0 8.63 10-year Storm 010 Mannings 1100 V 10 Travel Time, t,11 ·Actual Design % Full (cfs) (cfs) (fps) (sec) (min) (in/hr) 35.12 8.5 56.7 19 0.31 8.80 ------- 31 .26 7.2 58.8 4 0.07 8.80 ------------------- 23.56 7.5 61 .2 18 0.29 8.80 ---- ------ 23.56 7.5 61 .2 14 0.23 8.80 ------17.74 6.3 55.9 21 0.35 8.80 -----------14.53 5.1 56.0 6 0.10 8.80 --------4.14 6.68 5.5 41 .2 37 0.61 9.27 92.06 9.5 61 .3 17 0.29 7.18 -------86.33 10.2 57.9 9 0.16 7.18 ---------- 9.40 4.1 47.1 15 0.24 11 .64 ·rhese values reflect the actual flow for the 18" & 24" pipes. The design flow for these pipe sizes reflects a 25% reduction in pipe area . 100-year Storm 0100 Mannings •Actual Design V100 % Full Travel Time, 1"00 (cfs) (cfs) (fps) (sec) (min) 47.63 9.0 69.8 18 0.30 ---- 42.40 7.7 73.1 4 0.07 ---------- 31 .95 7.9 76 .9 17 0.28 ----- 31 .95 7.9 76 .9 13 0.22 ---24 .06 6.7 68.6 20 0.33 --------19.70 5.5 68.8 6 0.09 ----------5.61 9.05 5.9 48.9 34 0.57 125.43 100 83.2 17 0.28 -------117.62 10.8 71 .9 9 0.15 -----12.68 4.5 56.3 13 0.22