Loading...
HomeMy WebLinkAboutDrainage Report' l . Drainage Report for Castle Rock Subdivision Phases lB & lC College Station, Texas July 2007, Developer: Greens Prairie Investors, LLC . 4490 Castlegate Drive College Station, Texas 77845 (979) 690-7250 Prepared By: Civil Development, Ltd. 2033 Harvey Mitchell Parkway South College Station, Texas 77840 (979) 764-7743 , . ENGINEER Drainage Report -Executive Summary Castle Rock Subdivision, Phases lB & 1 C College Station, Texas July 13, 2007 Civil Development, Ltd. -Joe Schultz, P.E. Uoe@cdlbcs.com) P.O. Box 11929 College Station, Texas 77842 Phone: (979) 764-7743 Fax: (979) 764-7759 OWNER/DEVELOPER Greens Prairie Investors, LLC 4490 Castlegate Drive College Station, Texas 77845 Phone: (979) 690-7250 GENERAL DESCRIPTION AND LOCATION This project consists of the development of Phases 1B & 1 C of the Castle Rock Subdivision in College Station. Phase lC is a single-family residential development, and Phase 1B is zoned A-P for office use. Development includes the construction of utilities and infrastructure. Phases lB & 1C are located adj acent to Phase l A of the Castle Rock development. The entire site lies within the corporate limits of the City of College Station. Thi s development is north of William D. Fitch Parkway and the Corps of Engineers protected greenbelt area owned by the City of College Station, which is adj acent to this tract to the north. Area: 6.8 acres Existing Land Use: Vacant Proposed Land Use: Single-Family Residential I Office Number of Lots: 10 lots residential, 7 lots office Drainage Basin: Spring Creek Tributary A FEMA FIRM: #48041C0205 D, dated 2/9/2000 Floodplain: A portion of these phases of the development lie within the floodplain. No portion of the floodplain encroaches into the residential lots. HYDROLOGIC CHARACTERISTICS The existing site is predominately wooded with open areas where the sanitary sewer line was constructed. The elevations range from 284 to 302, sloping in a southerly direction, where runoff enters Tributary A of Spring Creek on the adjacent tract, which ultimately flows into Spring Creek. A detention pond was constructed on the Crowley Tract downstream of this development. GENERAL STORMW ATER PLAN The drainage plan for this development wi ll invol ve the installation additional pipes, inlets &junction boxes, which will collect and transmit the runoff to the existing stom1 sewer system in Phase lA or into existing drainages which flow across the adjacent h·act and then into Tributary A of Spring Creek. The detention pond for this proposed de ve lopment is located on the Crowley Tract. COORDINATION & STORMWATERPERMITTING The project will require that a Notice oflntent be submitted to the Texas Commission for Environmental Quality. No other permits are anticipated for thi s project. The following items comprise thi s drainage report for this proj ect: Executive Summary Technical Design Summary Appendix A -Drainage Area Calculations Appendix B -Depth of Flow in Gutter Appendix C -Storm CAD Pipe Analysis Appendix D -Drainage Area Map (Exhibit A) CERTIFICATION I, Joseph P. Schultz, Licensed Profess ional Engineer No. 65 889, State of Texas, certify that this report fo r the drainage design fo r Castle Rock Subdivision, Phases JB & 1 C, was prepared by me in accordance with the provisions of the Unified Stormwater Design Guidelines. __ ,,,,,, --r:, OF /~ \\ ,£.:~-"' ...........• -r"i' '• IF c, •• • * ··. U' t, " •• \*#. "'* • • * ii * : ···············~ i ................... SCHULTZ J JOSEPH P; ••••••••••••••• ~ ~ t•••••••••••••••• I ~ '-,~ ··. 65889 <;).:181 f4~;,;~f.91sr~'r'.~··~~ ,,~s,0·N-;~ ~t.r1 ,. I 6 'D 7 ,,'!(,.~- 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 City: Bryan C ; " ~ I ()-e v<-l '°f J r Lt-d . P. O · (3 .,'1-.. tl°>"Z.~ V College Station Loll c.~ c S}c-}-~ I T-1--7 7 ~ 4 7. Date of Subm ittal: 7 I r'.G."'7 Lead Engineer',$ ~te a{f Contact lnfo.(phone, e-mail, fax): Other: J<>.Scf.l-..5::~ (_ / .f.C.. 7 64;-77 {.J p. ~t:icG. e.cklkkr he.-76-f -7751 rrf Supporting Engin eering I Consulting Firm(s): Other contacts: )j/A- Developer I Owner I Applicant Information Phone and e-mail : De:veloper I Applicant Name and Address: G«~·~v-5 rc ·.-i<.. +..._~11-rr, L+d-. Jt.\ 'f D (.c.itl <-5 ~r:,.~ () 4 <) q 7 '1 < {, 9u -7 Z 5"0 t-tlqc.'(-{-,7i--1 7 o · Property Owner(s) if not Developer I Applicant (&address): Phone and e-mail: Project Identification Development Name: c~~tlc ~ck f"'bJ;..,.~;""' /I NNI ( t3 t )L Is subject property a site project, a single-phase subdivision, or part of a multi-phase subdivision? ~ v-\. ~ ; -v k~J .... If multi-phase , subject property is phase z_ of i Legal description of subject property (phase) or Project Area: (see Section II , Paragraph B-3a) ~ µ s .ft,,_,,.. ~-1 f v-n I If -f1 ft,,&~1 /.tc-/'< !; ou-->r of ~ 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. P 1'.t re_ IA /5 /l.C"N ;J u.7!.d-~ J ~r+,..-... h General Location of Project Area, or subject property (phase): C .dlc.,;e-/Q w'-(Lo--o. f=:f-ch (\ ~* "'1 "'-J -A v tf"\,._ .f. In City Limits? Bryan : -acres. College Station: ~.<t'\\ acres. STORMWATER DE SIGN GUIDELI NES Effective February 2007 Extraterritorial Jurisdiction (acreage): Bryan: -College Station: - Acreage Outside 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: ~;h_ k p~"'4 developments: Cc.ff-/ e ~'"-~ !/\(: ffi ~ (;-...,,..__ 0 f ~n <-f A Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): cJ Nof\"i: vv-! f-L :--. 5" :J-e._ 5°;Jt-;~\ Plat Information For Project or Subject Property (or Phase) Preliminary Plat File#: 6] r-SOD\ J Z .......__ -Final Plat File #: Date: C tJ+!c Ru~ Jor ~J ;..r,/:__, --Name: Status and Vol/Pg: .___ If two plats, second name: File#: Status: N {A Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: f O ~xistii:iJJ or Proposed? Case Code: Case Date Status: Zoning Type: A-/ (J Existing or Proposed? Case Code: -Case Date Status: Stormwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s) & Date(s): Participants: N /ft Preliminary Report Required? NL A-Submittal Date Review Date Review Comments Addressed? Yes --No --In Writing? When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explainin9;;7 ;viation (s) from provisions of Preliminary Drainage Report, if any. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 4 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ___ _ 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 With Other Dept. Contact: Date: Subject: Departments of Jurisdiction City (Bryan or College Station) 1---------+-------+--------.,1---------------i Coordination With Non-jurisdiction City Needed? ./ Yes No V Summarize need(s) & actions taken (include contacts & dates): Coordination with Brazos County Summarize need(s) & actions taken (include contacts & dates): Needed? / Yes No ---- Coordination with TxDOT Ne_7ded? Yes V No ---- Coordination with T AMUS Needed? Summarize need(s) & actions taken (include contacts & dates): Yes __ No V 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 US Army Crops of Engineers No __ Yes V US Environmental Protectio;>-Agency No V Yes ---- Permitted or Approved? Texas Commission on ~c ,_........ .. ~ (4..---1 Enviro'Nlental Quality No_~_ Yes~ l S'oo 0 0 Brazos River Authoriy No J Yes STORMWATER DESIGN GUIDELINES Effective February 2007 Status of Actions (include dates) I _; \J Page 5 of 26 APPENDIX. D TECH. DESIGN 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? N,,, ..... e -v" i:. "-k 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 __ Construction of streets and utilities to serve one or more platted lots. Development VConstruction 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 ~o~1 -~{-r~. 131{ Size of Io L..<t } J, 01)' Pro12osed A-i p -{) (: ~ ~ ..,,...-1 Project l~ L.,~~ Dr ... i:....°'~ I '-~c.ie~) 35'0 Is an y work planned on land that is not platted If yes, explain: or on land for which platting is not pending? ~o __ Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse I No V Yes __ (Section 11, Paragraph B 1) or a tributary thereof? Is any part of subject property in floodplain I No_ Yes v Rate Map fg o t\( Ct>Z.1.'S area of a FEMA-regulated watercourse? -- Encroachment(s) Encroachment purpose(s): __ Building site(s) __ Road crossing(s) into Floodplain areas planned? __ Utility crossing(s) V Other (explain): qi) No ~l-\-r-.~j e'f-~ ~ ~~"'-'-)( ~ ~ {l: pri f Yes ~'-J ; ~ -- 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. f L\C)~.& ~~.,,'L ..... s "''\>J " STORMWATER DESIGN GUIDELINES Effective February 2007 o""" Qo-k VV\e r \ Page 6 of 26 APPENDIX. D TECH. DESIGN 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 don e for larger area including subject property? YeV"' _,Reference the study (&date) here, and attach copy if not already in City files. Lc,rn(.._ l.--.jf\--L-~~a Is the stormwater mana7nt 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 --Yes Describe them (include approximate size, volu me, outfall, model, etc). / Any known drainage or flooding problems in areas near subject property? ~ No --Yes Identify: Based on location of study property in a watershed, is Type 1 Detention (flood conp;I) needed? (seeTableB-1 inAppendixB) + co v ~ .... lD cO ~\rk __ Detention is required. __ Need must be evaluated. ~ Detention not required. What decision has been reached? By whom? If the need for Type 1 Detention How was determination made? must be evaluated: STORMWATER DESIGN GUIDELIN ES Effective February 2007 Page 7 of 26 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 P!;>ase) (continued) Does subject property straddle a Watershed or Basin divide? _:!___ No --Yes If yes, describe splits below. In Part 4 describe desiqn concept for handlinq this. Watershed or Basin Larqer ac reaqe Lesser acreaqe Above-Project Areas(Section II , Paragraph B3-a) Does Project Area (project or phase) receive runoff from upland areas? __ No VYes Size(s) of area(s) in acres: 1) ''l ~-~ 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s). small creek (non-regulatory), regulatory Watercourse or tribut15y); C...c: .. v-. c.. ..... J-r...J fi. "'_, f C"" ~ ('I-0 Ol C: '--\ v-.rf f ~/(-,-~ ..... w :µy.. )\-\~~ . Flow determination: Outline hydrologic methods and assumptions: (2_cf-;_~ 1~ ~1 .J k ~\v-,,.,...4 r"""'""t f rC-Uv--'\. pc.:ir~ [c,;f{c._)erK J 5 H kt>· Does storm runoff drain from public easements or ROW onto or across subject property? __ No ~s If yes, describe facilities in easement or ROW: L.."" \ ..., .v-h .. w .O. ~~~L~ f'J -kvV , fl~ 0 -IN - ( .... , Are cha~s in runoff ctl9!acteristic~ subject to change in future? Explain O ~ e 5, . CV -0 . r---h "'-""'. ( \ l,, "(_ u,...,..-.Jf.,_ !J ~ r_::.c ct... t.rJ/ . V-/ CU ~n~h5 ~cc~ .hr Y\R. o:jc}-_µ pr"e.-J-cM~ Conveyance Pathways (Section 11 , Paragraph C2) Must runoff from study property drain across low~perties before reaching a Regulatory Watercourse or tributary? No Ye s Describe length and characteristics of each co nveyance pathway(s). Include ownership of property(ies). c _.1 .. 2 s ~ . ~~~ £J.f ~hc~_J Cl ~ p ?-~ ""I 5 t/-"-. ~-/\.1:i r 5 ~ <--e-.\-cf ( ~ v-1 cy. e. c,. ') - Dw f'A.J .s-l:f csf Tn-ef r [:-I, of-Cc ~e 5+~-, 5 STORMWATER DESIGN GUIDELIN ES Effective February 2007 Page 8 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ---- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~erty Characteristics I Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways (continued) Do drainage If yes, for what part of length? % Created by? __ plat, or easements instrument. If instrument(s), describe their provisions. exist for any -- part of ~y(s)? 0 Yes -- Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired?) Pathway c._:~ t:. ..._,-..,... \ f ro {)~· Areas ~ ~~ ~~-~o!S <J..r( ~ /'V-< ,.....,,,. {{, ~f,) C•ll-, VJ-;)._,,4~ µ,_J-LC·r~ ~ 'e.~lr'--> ;.:Q \:---<\~ '.. \-~ ~fr"--J Cru)t. -'Cc;b . A· Describe any built or improved drainage facirities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). ~'"'-Q.. -- Nearby Drainage Do any of the~ve hydrologic or hydraulic influence on proposed stormwater Facilities design? __ No __ Yes If yes , explain : STORMWATER DESIGN GUI DELINES Effective February 2007 Page 9 of 26 APPEN DIX. D TECH. DES IGN 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 Uplan d 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. <~~w 0, P:f ·<-P~ /+l\ f(a~ ~Q~ '--'fl _J Ov-t.. ~ l : I Discharge(s) To Lower Property(ies) (Section II , Paragraph E1) / Does project include draina g~, features (existing or future) proposed to~me pu blic via platting? __ No ~Yes Separate Instrument? 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 pro vide status of actions on each . (Attached Exhibit # ) *' bt-Jc~ f\J ,..+-N'~e~ ~ c ~?-i {)"V ..... f fr~~· Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated , etc.). (Attached Exhibit# ) Combination: If combination is proposed, explain how discharge will differ from pre- development conditions at the property line for each area (or point) of release. If Scenario 2, or Combination are to be used, has proposed design bee n coordinated with owner(s) of receiving property(ies)? No --Yes Explain and provide documentation. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 10 of 26 APPENDI X. D TECH. DESIGN SUMMARY As Revised ____ _ t SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.2) Stormwater Management Concept (continued) Withi n Project Area Of Multi-Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result Ai)A in shifting runoff between Basins or between What design and mitigation is used to compensate for increased runoff Watersh C:ls? from gaining basin or watershed? No !'1 /A-Yes -- How will runoff from Project 1. V With facility(ies) involving other development projects. Area be mitigated to pre-2. __ Establishing features to serve overall Project Area . development con ditions? Select any or all of 1, 2, 3. __ 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# ) O-e~ PoJ ~c:1-\'.:I Y'\ tr~~-A.1 ~v.J v--J v c ' "-i f'\. CCN" sf-\ (o 2. For Overall Project Area (type & location of facilities): (Attached Exhibit# ) ~{c-J \l Lr~ ~ PJ· 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. Are aquatic echosystems proposed? __ No --Yes In which phase(s) or project( s)? ('· -0 QJ If) c QJ c >-Are other Best Management Practices for reducing stormwater pollutants proposed? co 0:: No _ifies Summarize type of BMP and extent of use: If) --~1 }..o ....._ .. \c.~ J <=~~ c .Ql If) roJr... f'fr•f QJ .>: [f -Fc.tt c e. 1 k~ k, "-l ~ Jc ~J I iJi If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain in later questions. QJ --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 Conce~t and Design Parameters I Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi-Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? __ No~ Yes Identify type and general size and In which phase(s). -elA.~1."\.C..<: ~ W. 0-~~ ~"' L., Lu.__\ \.) "" t-Q__ Jy-~ v 12 "" , If detention/retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (ph ysical location, conveyance pathway(s), construction sequence): 0-c.~ f<t'J:~-sCi {:_L...-,../ f-.,-_.J.J-. Within Or Serv ing Subject Property (Phase, or Site) If property part of larger Proje~ea, is design in substantial conformance with earlier analysis and report for larger area? __ Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? I Surfaces? ('-· -0 <lJ Cf) Steepest side slopes: I Usual front slopes: I Usual back slopes: Cf) ::::J <lJ Cf) >- <lJ I ..c. Flow line slopes: least Typical distance from travelway: .~ -0 typical (Attached Exhibit # ) <lJ greatest 1~1 Are longitudinal culvert ends in compliance with B-CS Standard Specifications? Yes No, then explain: <( Cf) At intersections or otherwise , do valley gutters cross arterial or collector streets? .c <lJ ~o __ Yes If yes explain: !~!1 ~ ~ Ar~ey gutters proposed to cross any street away from an intersection? Cf) <lJ Q) 3 0 ~ rnz __ No __ Yes Explain : (number of locations?) u; -0 I <lJ c .'.{ C1l STORMWATER DESIGN GUIDELINES Effective February 2007 Page 12 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX 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) (conti nued) Gutter line slopes: Least SJ~'(, ..::.f) Usual Cl,~•=+:> Greatest G .o"I..::; Are inlets recessed on arterial and collector streets? ~Yes --No If "no", identify where and why. Will inlets capture 10-year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? Vves __ No If no, explain where and why not. ('· "O Cl> en Will inlet size and placement prevent exceedVllowable water spread for 10-year ::i 2 design storm throughout site (or phase)? __ Yes __ No If no, explain . :; 5-c-e ft PIJ <-~ .'it.. t3 Ol -o ~ / c "O I ~No rn Cl> Sag curves : Are inlets placed at low points? Yes Are inlets and .0 ~ --'--·-conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? ::i-u c Yes No Explain "no" answers. 0 ..c u -----~ 5 (;. s s+rtJ-'§ rVI.'.) 1..v-\ .._+-s < .,.._ C> ·" en u; A-c. Uf 5 O r~.,.<. lA_., j : .--.1 J.s : ,, 5 L~y ~ u; Cl> Will 100-yr stormflow be contai~ combination of ROW and buried conduit on -< whole length of all streets? __ Yes __ No If no , describe where and wh y. Do d~ns 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'-· "O Pipe runs between system I Typical ( 0 I) ( 104' Cl> Longest en en access points (feet): ::i Cl> E >-~I Are junction bo xes used at each bend? -0es --No If not, explain where and why. en c rn o '--z "O I E 0 Are dow/am soffits at or below upstream soffits ? Least amount that hydraulic u; .!!l. Yes __ No __ If not, explain where and wh y: grade line is below gutter line (system-wi de) I A-( ,.... I 0 'i / 5 f., ,...,,.. .i (' II I . / ~ J r:_ c. MJlJ<-Gl"<'f-'- STORMWATER DES IGN GUIDELINES Page 13 of 26 APPENDIX D TECH. DESI~~ SUMMARY Effective February 2007 As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Pa rt 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, o r Site) (continued) Describe watercourse(s), or system(s) receiving system discharge(s) below If) (include design discharge velocity, and angle between converging flow lin es). a.> u c 1) Watercourse (or system), velocity, and angle? C1l u; R-~kl Vc_e--k G."-r+.-l:)C ~'"J•J :~ -er-Ls~ 5;,l ,, ..,...,;-c ~ 5c lfr u ~o ~ E 2) Watercourse (or system), velocity, and angle? ::l ..__ \);f<-K~""~UJ.U-J..ls._ \.-.. -;(.{ C>-"~ ra"k-r :f ''f c 0 \ ·-..... c . fl 0 .E ,...__} t\.t "'-: ~ ef--:~ ~ Jv,.' .... .,J~. ~)f-;...,..j...J U e_ ~ ... J af. ~.~ E a.> ~ a.> E 3) Watercourse (or system), velocity, and angle? . -C1l ~ A-cc.c55 (),~-Jt..vvJ Q.,.A of'"-~'/ r d-~cl-..oy<J ~-{c.r.h If) If) >-::; If) a.> 0 /Jrv(Y If 10 -=-1.u Fr c :2 r~~r,. w ~...... c:,--l,'...,, c{'.sJ '.V rs /w .. -;,W ~o. · ·-> €-.s( ,__),..j IJ c.. \\lt. /'1 ~ c.~!> r ~VJr~fJ \) ( o -r 3.1 ~p.5 u, .. -,>.~t,' C1l 0 -0 0. IJ,.,0-:: <1. 4f1i j E-..__ a.> For each outfall above, what measures are ta~en tb prevent erosion or scour of 0 a.> receiving and all facilities at juncture? -..c (/) If) 5< c. P-\.-• I t I A-d..o .. <' ~,,.. 2 1) ~ o-. ~{ ~t ~r t'Sh <--kl / (ICk_(")frff I y e-) J C1l ~ o._ 2) a.> If) c 3) f~c \l__ (2-~ f<<-f / ) r-~ s 5 ~ 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): C'· If) a; ~ If) -a.> Flow line slopes (m inimum and maximum): ~ >- i I jJ, Outfall characteristics for each (velocity, convergent angle, & end treatment). If) a.> .'.{ 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 Subjec t Property (Phase;6r Site) (continued) (/) Are roadside ditches used? ~No __ Yes If so , provide the following ~ ~ Q) 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 Q) -----0 For any "no" answers provide location(s) and explain: (/) -0 Cll 0 Cl:'. If conduit is beneath a swale, provide the following information (each instance). t0i r- Instance 1 Describe general location, approximate length: (/) Q) >- 1~ Is 100-year design flow contained in conduiUswale combination? --Yes --No If "no" explain: r. I~ Space for 100-year storm flow? ROW Easement Width Swale Surface type , minimum Cond uit Type and size, minimum and maximum 0 and maximum slopes: slopes, design storm: ('-· :~ -0 (/) -0 Q) Cll c >-Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c Cll c ..c Cll u ~ c .2 Q) c a. 0 0 ~ Access Describe how maintenance access is provided (to swa le, into conduit) -0 § ::J Q) 0 --c c ·- Q) -0 E Instance 2 Describe general location, approximate length: Q) Cll (/) (/) ::J (/) Q) c ~ 0 > Is 100-year design flow contained in conduiUswale combination? Yes No :;= e ----Cll a. If "no" explain: c :.a © E Q) 0 ..c Space for 100-year storm flow? ROW Easement Width u (/) ·-Q) Swale Surface type , minimum Conduit Type and size, minimum and maximum ::J I§ -0 and maximum slopes: slopes, design storm : c Cll 0 a. u Q) Qj (/) Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): Cll c s: ~ (/) Q) ~ Access Describe how maintenance access is provided (to swale, into cond uit) 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 Conce~t and Design Parameters I Continued (Page 4. 7) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) \ A If "yes" provid e the followin g information for each instance: fJ I lc!S Instance 1 Describe general location, approximate length, surfacing: c ..!:!! E Q_ x g w :t:: ui Is 100-year design flow contained in swale? --Yes --No Is swale wh olly 0 Q) within drainage ROW? Yes No Expla in "no" answers: c >-2 I ---- Q) > "iii Access Describe how maintenance access is provide: u Q) ~~ n Instance 2 Describe general location, approximate length, surfacing : Q) ·c C'· :::i rn ..0 c :J Q) 0 E £ Q) rn Is 100-year design flow contained in swale? Yes No Is swale wholly -~ rn ----Q) within drainage ROW? __ Yes No Explain "no" answers : rn ~ ~ 0 -- rn ~ 3: rn 0 -a:: Access Describe how maintenance access is provided : ~ u ..0 :::i Q_ Instance 31 41 etc. If swales are used in more than two instances, attach sheet providing all above information for each instance. , "New" ch annels : Will any area(s) of concentrateifow be channelized (deepened, widened, or straightened) or otherwise altered? __ No __ Yes If only slightly C'· shaped, see "Swales" in this Part. If creating side banks, provide information below. -0 c Q) Will design replicate natural channel? Yes No If "no", for each instance rn rn 0 0.. ----- Q_ x describe section shape & area , flow line slope (min. & max.), surface s, and 100-year ~ w design flow, and am ount of freeboard: Q_ rn rn Instance 1: c Q) Q) >- 11: Instance 2: Instance 3: 0 STORMWATER DESIGN GUIDELINES Effective Februa ry 2007 Page 16 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 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) / Existing channels (small creeks): Are these used? No v Yes --If "yes " provide the information below. / Will small creeks and their floodplains remain undisturbed? V Yes --No How many disturbance instance s? . Identify each plan~ed locati~ c.J cf-A )I-ft>~ f~..,~ uf' "'"', .ey._-5~ ~ ~ dvo ·~•ji.. cJ-. f .._p{_ 4-w.'lf /,,-< (,~J \N .f ~ r.'fr•t wkL ~ r vY\l).Cfe ."' For each location, describe length and general type of proposed improvement (including floodplain changes): ) cc c, (,(} \J --- For each location, describe section shape & area, flow line slope (m in. & max.}, surfaces, and 100-year design flow. rc~l4 '}(~ -C> '4 •./:, -0 Q(,c ·-:.. l r f. (, o c:-f 5 ef•~(L Q) ~-J.tv--h rs' "':h e ff w ·-""' ~h. c_,1 ... C// :::J c ~ Watercourses (and tributaries): Aside fro~ge changes, are Regulatory 0 ~ Watercourses proposed to be altered? __ No __ Yes Explain below. Vl c Submit full report describing proposed changes to Regulatory Watercourses. Address Q) existing and proposed section size and shape, surfaces , alignment, flow line changes, E Q) 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 ~\~ - Qi c c !1l All Proposed Channel Work: For all proposed channel work, provide information .c 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. µ\~ Will 100-year flow be contained with one foot of freeboard? --Yes --No If not, identify location and explain: rJ l pr Are ROW I easements sized to contain channel and required maintenance space? --Yes --No If not, identify location(s) and explain: tJl~ STORMWATER DESIGN GUIDELIN ES Effective February 2007 Page 17 of 26 APPENDIX. D TECH . DESIGN SUMMARY As Revised ____ _ -! .. r 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) t.r"'"'\I ~ \)().- How many facilities for subject property project? For each provide info. below. For each dry-type facilitiy: Facility 1 Facility 2 Acres served & design volume + 10% 100-yr volume: free flow & plugged Design discharge (10 yr & 25 yr) Spillway crest at 100-yr WSE? __ yes --no __ yes --no Berms 6 inches above plugged WSE? __ yes --no __ yes --no Explain any "no" answers: if) Q) >- I For each facility what is 25-yr design Q, and design of outlet structure? 11 Facility 1: 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: if) 0 0.. e 0... if) For each , what is velocity of 25-yr design discharge at outlet? & at spillway? Q) ~ Facility 1: & Facility 2: & -u C1l Are energy dissipation measures used? No Yes Describe type and LL ----c location : ·E c Q) (i) 0 Q) 4: 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 GUIDELIN ES Effective February 2007 Page 18 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ ~ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceQt and Design Parameters I Continued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Do structures comply with B-CS Specifications? Yes or no, and explain if "no": Facility 1; rn ~ ~u ro QJ LL ::::i c Facility 2: C:;::::; 0 c :;::::; 0 c u Q) ~ Q) 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 required design storm? Roadside Ditches: Will culverts serve access driveways at roadside ditches? --No vfYes If "yes", provide information in next two boxes. Will 25-yr. flow pass without flowing over driveway in all cases? ----LL Yes --No Without causing flowing or standing water on public roadway? /Yes --No Designs & materials comply with B-CS Technical Specifications? L Yes --No Explain any "no" answers: C'-· rn 01 c rn I rn Are culverts parallel to public roadway alignment? ---bl-Yes No Explain: 0 -- 111 W -(J . F: h-\\ &) 'Yk-v--1 Creeks at Private Dri ves : Do private driveways, drives, or streets cross drainage ro wa~hat serve Above-Project areas or are in public easements/ ROW? "O 0 __ No __ Yes If "yes" provide information below. Q) z rn I ::::i How many instances? Describe location and provide information below. ~ Q) Location 1: .2: ::::i u Q) 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 APPENDI X. D TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.11 ) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulatoct 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: w Arterial or Major Collector Streets: Will culverts serve these types of roadways? Q) No Yes How many instances? For each identify the ..c:: (/) ---- Q) location and provide the information below. "' ro Instance 1: Q) ..... >-~ I ~ Instance 2: Instance 3: c 0 ~~ Yes or No for the 100-year design flow: 1 2 3 z E I~ Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? E <'-· co Is velocity limited per conditions (Table C-11)? (/) (/) g1-o Explain any "no" answer(s): ·-c ~ co 0 c ..... 0 u~ >-co co () ~ _Q -0 Q) co .D Minor Collector or Local Streets: Will culverts serve these types of streets? 0 ·-.......... () () No Yes How many instances? for each identify the ·-(/) -Q) ----.g -0 location and provide the information below: a_ Q) -a_ Instance 1: co :c -0 >-Instance 2: Q) c ~ co -Instance 3: (/) 0 t"' Q) Q) ~ () For each instance enter value, or "yes " /"no" for: 1 2 3 :::Jc () co Design yr. headwater WSE 1 ft . below curb top? Q) (ii ..... 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 tra velways 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? Q) :::J No Yes If "yes" identify location(s), describe outfall design treatment(s): c ---- ~ 0 ~ !/) t:'. Q) ~ :::J Is scour/erosion protection provided to ensure long term stability of culvert structural u com ponen ts, 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 8-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 TECH . DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceQt and Design Parameters j Continued (Page 4.13) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Is a bri dge included in plans for subject property project? --No --Yes If "yes" provide the following information. Name(s) and fu nctional classification of the roadway(s)? What drainage way(s) is to be crossed? ~ Q) Ol l:l ·.::: Ill A fu ll report supporting all aspects of the proposed bridge(s) (structural, geotechnical , hydrologic, and hydraulic factors) must accompany this summary report. Is the re port provided? --Yes --No If "no" explain: Is a Stormwater Provide a general description of planned techniques: .~ Pollution Prevention ~ () » p( ...... LSU 1) J --Iii Plan (SW3P) ::i -f._e._ ~"'-£' a establi shed for ~1C~ {dn-v./) "> Qi project cons:ftion? ro s __ No · Yes Special Designs -Non-Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland-type detention, natural stream ::Ljtion, BMPs for water quality, etc.) proposed for any aspect of subject property project? 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? N\~ STORMWATE R 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 J Continued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) "-.l '(A- Special Designs -Deviation From 8-CS Technical Specifications I 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 Outfal ls ---------- __ Valley gutters __ Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviation(s). Specific Detail Element Justification for Deviation (attach additional sheets if needed) 1) 2) 3) 4) 5) Have elements been coordinated with the City Engineer or her/his designee? For each item above provide "yes" or "no", action date, and staff name: 1) 2) 3) 4) 5) Design Parameters Hydrology / Is a map(s) showing all Design Drainage Areas provided? ~Yes --No Briefly summarize t~ of applications made of the Rational Formula: ~"'-~~~ ....-~ ~r ~""-J ..\-t )~~ ¥\_/ f'f~> v.1 c_,...\",0 5';"2-~ What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? Z Ci. \I acres STORMWATER DESIGN GUIDELINES Effective February 2007 Location (or identifier): o.~.2&3 -5<c Page 23 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Re vised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making d~tions for time of concentration, was segment analysis used? No es In approximately what percent of Design Drainage Areas? £rD % As to intensity-duration-frequency and rain depth criteria for deter~g 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 : i-( 0 ,..__:/'-~ U..f<) +:: rc~,:: .... c For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked}, and that used as the basis fo r design. Feature Analysis Year(s) Design Year Storm drain system for arterial and co llector streets tv if« JViA Storm drain system for local streets Io t to'~ I z; Open channels Io .\ I ti"> { () Swale/buried conduit combination in lieu of channel ..--~ Swales -- Roadside ditches and culverts serving them -- Detention facilities: spillway crest and its outfall -- Detention facilities: outlet and conveyance structure(s) ---- Detention facilities: volume when outlet plugged ....--.,-- Culverts serving private drives or streets I ..:i I 1 ~ \:) I D D 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) -{ 3;~ --4-.S Lowest (feet per second) __.. :S, <; / 3. ( Streets and Storm Drain Systems Provide the summary information outlined below Roughness coefficients used: For conduit type(s) t\OPE. STORMWATER DESIGN GUIDELIN ES Effective February 2007 For street gutters: Page 24 of 26 o. 01'\- Coefficients: OJ)\L APPENDIX D TECH. DESIGN SUMMARY As Revised ____ _ re C>..r SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Pa rt 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 ~mptions other than allowable per Guidelines~ Inlet coefficients? __ No __ Yes Head and friction losses __ No --Yes Explain any "yes" answer: In conduit is velocity generall y increased in the downstream direction? ..\L Yes ~No Are elevation drops provided at inlets, manholes, and junction boxes? Yes No -- Explain any "no" answers: I Are hydraulic grade lines calcul:::0d 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: l {)-. p (_ ~ -\w -o f i-l.u r ; re_ 5Pb r w ~ { f-J- , Open Channels If a HEC analysis is utilized, does it follow Sec Vl.F.5.a? fl icr-es __ No Outside of straight sections, is flow regime within limits of sub-critical flow? --Yes --No If "no" list locations and explain: f'-J 1 (k 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? -:C:-1,--\-\-~ Y/'-~\I I Entrance, friction and exit losses: 0. )' c v--.+-rc~....._ \ .... c, r C.U<_~ \ . Bridges Provide all in bridge report "-'l ~ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 25 of 26 APPENDIX. D TECH. DE SIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Contin ued (Page 4.17) Design Parameters (continued) Computer Software What com puter 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 /ho.w~ ~-l. l H ;--. sf--.-J v. )l\irll'-C {i-0 I Part 5 -Plans and S~ec ificati ons Requirements for submittal of construction drawi ngs and specification s do not differ due to use of a Technical Design Summary Report. See Section 111, Paragraph C3 . Part 6 -Conclusions and Attestation Conclusions Add any concluding information here: ~J -'s""" c: 0 ~( :~} w ~ ~· G,.,. ~ .l.si.L ~ <\. Attestation Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Desiqn Summary Drainaqe Report by siqninq and sea linq below. "This report (plan) for the drain age 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 th~~~sed drainage improvements have been issued or fall under applicable general p~ OF }'\l \ ,\l ~ ~ ~ ~ ~ ········· ~-C I ~ (Affix Sef. ;.··· *·····~IP\ .,. \ ,;*• ·*~ ~·········.... . ~ >~. J \J l JOS ••••••••••••••• • * Licensed P fess1onal En gineer -,. ••••••• Jf.!t._P. SCHULTZ°···~ ,1 ~ 65···················~ State of Texas PE No. (o)~t~ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 26 of 26 \<1··~~ 889 / $J ftf~·;:~~~.Tf.'f'-~~;:._~;/ '1\• VNAL t:.""-- APPENDIX. D TECH. DESIGN SUMMARY As Revised ____ _ APPENDIX A Drainage Area Calculations Castle Rock Subdivision Phases 18 & 1C Drainage Area Calculations Area Area No. (acres) A1 A2 AJ 248 1.47 Total 1.47 ---------249 1.08 1.08 --250 0.86 0.86 ----------· -· >---259 0.32 0.32 ------------261 0.53 0.53 ---------261A 1.42 1.42 -----------260 0.43 0.43 ---------260A 0.04 0.04 c tc C1 C2 C3 Crotal (min) 0.55 0.55 20.8 -------0.55 0.55 15.2 ----0.55 0.55 13.3 -----------0.9 0.90 10.0 --------0.55 0.55 10.0 ---------0.85 0.85 10.0 ----------0.85 0.85 10.0 ---------0.9 0.90 10.0 -------------------262 ------262A 0.07 ---- 263 5.81 3.30 The Rational Method: Q =CIA Q = Flow (cfs) A = Area (acres) C = Runoff Coeff. 0.53 0.53 -------0.07 -------20.20 29.31 0.55 0.55 10.0 ----------0.9 0.90 10.0 ------------0.35 0.9 0.55 0.55 29.2 I = b I (tc+d)" tc = Time of concentration (min) C1 = 0.85 = Commercial Area C1 = 0.35 = Undeveloped Area 5 year storm Is Os (in/hr) (cfs) 5.362 4.34 ---6.333 3.76 ------6.763 3.20 ------ 7.693 2.22 7.693 2.24 ------7.693 9.29 ---7.693 2.81 7.693 0.28 ------7.693 2.24 ------7.693 0.48 ---7 0.89 4 399 I = Rainfall Intensity (in/hr) C2 = 0.90 = Impervious Area (pavement) C3 = 0.55 = Residential Area Brazos County: 5 year storm b = 76 d = 8.5 e = 0.785 10 year storm b = 80 d = 8.5 e = 0.76 25 year storm b = 89 d = 8.5 e = 0.75 50 year storm b = 98 d = 8.5 e = 0.745 10 year storm 25 year storm 50 year storm 100 year storm 110 0 10 (in/hr) (cfs) 6.080 4.92 -----7.148 4.25 ---7.618 3.60 ---- 8.635 2.49 ---8.635 2.52 -------8.635 10.42 8.635 3.16 8.635 0.31 ------8.635 2.52 ------8.635 0.54 ---80:82 5.016 tc = L/(V*60) L = Length (ft) 125 (in/hr) 6.972 ---8. 181 ---8.714 9.861 9.861 ---9.861 ---9.861 ---9.861 -----9.861 ---9.861 ---5.765 V =Velocity (ft/sec) 100 year storm b = 96 d = 8.0 e = 0.730 02s lso Oso 1100 0 100 (cfs) (in/hr) (cfs) (in/hr) (cfs) 5.64 7.914 6.40 8.259 6.68 ------------4.86 9.269 5.51 9.671 5.74 ----------- 4. 12 9.865 4.67 10.293 4.87 ----------2.84 11.148 3.21 11.639 3.35 --------2.87 11 . 148 3.25 11 .639 3.39 ---------------11 .90 11 .148 13.46 11 .639 14.05 -----3.60 11. 148 4.07 11 .639 4.25 ---------0.36 11 . 148 0.40 11 .639 0.42 -------- 2.87 11. 148 3.25 11 .639 3.39 ----·--------0.62 11.148 0.70 11 .639 0.73 92.90 ---105.69 -6.851 110.40 6.559 APPENDIX B Depth of Flow in Gutter Calculations Castle Rock Subdivision Phases18&1C Depth of Flow in Gutter (Refer to Exhibit A for Gutter Locations) Gutter A Location Area# (acres) G1 248 1.47 G2 250 0.86 G3 249 1.08 J1 260A 0.04 J2 262A 0.07 J3 260 0.43 J4 262 0.53 K1 259 0.32 Transverse (Crown) slope {ft/ft) 27' street = 0.0330 c Slope le (ft/It) (min) 0.55 0.0200 20.8 0.55 0.0200 13.3 0.55 0.0080 14.6 0.90 0 0080 10.0 0.90 0.0240 10.0 0.85 0.0080 10.0 0.55 0.0240 10.0 0.90 0.0080 10.0 Straight Crown Flow (Solved to find actual depth of flow in gutter, y): Q = 0.56 * (z/n) * S112 * /'3 ¢ y ={Q I [0.56 * (z/n) * 5112]}318 n =Roughness Coefficient= 0.018 S = StreeUGutter Slope (ft/ft) y = Depth of flow at inlet (ft) z = Reciprocal of crown slope: 27' street = 30 10-year storm 100-year storm 110 0 10 Y10-actual 1100 0 100 Y100 (in/hr) (cfs) (ft) (in) (in/hr) (cfs) (ft) (in) 6.080 4.92 0.290 3 48 8.259 6 68 0.325 3.90 7.618 3.60 0.258 3.10 10.293 4 87 0.289 3.47 7.289 4.33 0.328 3.94 9.858 5 86 0.368 4.4 1 8.635 0.31 0.122 1 47 11.639 0 42 0.137 1.64 8.635 0.54 0.123 1.47 11 .639 0 73 0.137 1.65 8.635 3.16 0.292 3.50 11.639 4 25 0.326 3.92 8.635 2.52 0.218 2.62 11 .639 3 39 0.244 2.93 8.635 2.49 0.267 3.20 11.639 3 35 0.298 3.58 APPENDIX C Storm CAD Pipe Analysis 0-1 ~ c i1 I •-:i 1-2 Title· Castlerock Subdivision -Phase 1 B g \ \draina9elslorrncadlc238 stm 071 11/07 09 SO 43 AM '.£J H;,eslad Methocls. Inc Scenario: Base StorrnC/\D v4 I I 14 20 14 J 37 Brooks1cle 1c~oad Walerbury. CT 06708 USA r·~"1e 1 or 1 Label Upstrearr ~ownstrearr Length Number Node Node (ft) of Sections P-1 1-1 0-1 9.56 P-2 1-2 1-1 30.33 P-3 J-1 1-2 190.11 P-4 1-4 J-1 58.30 Title: Castlerock Subdivision -Phase 1 B 9 \ .\dra1nagelstormcadlc238.stm 07/11 107 09'.51 :52 AM 2 2 2 2 Scenario: Base Pipe Report Section Upstrearr Jownstrean :onstructec Mannings Total Design Excess Upstrearr Hydraulic Pownstrearr Size Invert Invert Slope n System Capacity Design Ground Grade Ground Elevation Elevation (ft/ft) Flow (cfs) Capacity Elevation Line In Elevation (ft) (ft) (cfs) (cfs) (ft) (ft) (ft) 30 inch 286.05 285.95 0.010460 0.012 84.56 90.89 6.33 291.14 288.23 288.95 30 inch 286.45 286.15 0.009891 0.012 84.16 88.38 4.23 291 .14 288.62 291 .14 30 inch 290.36 286.55 0.020041 0.012 81 .32 125.80 44.49 294:11 292.50 291 .14 30 inch 292.00 290.83 0.020069 0.012 81.47 125.89 44.42 295.64 294.14 294.11 © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA + 1-203-755-1666 Hydraulic Grade Line Out (ft) 288.01 288.17 288.03 292.45 Velocity Out (ft/s) 9.77 9.91 13.40 12.09 ::;1ormcAu v4.1.1 [4.2014] Page 1 of 1 Label lJpstrearr JownstrearT Length Number Node Node (ft) of Sections P-1 1-1 0-1 9.56 P-2 1-2 1-1 30.33 P-3 J-1 1-2 190.11 P-4 1-4 J-1 58.30 Title: Castle rock Subdivision -Phase 1 B g \ ... \drainage\stormcad\c238.stm 07/11 /07 09:52:16 AM 2 2 2 2 Scenario: Base Pipe Report Section Upstrearr Jownstrean 8onstructec Mannings Total Design Excess Upstrearr Hydraulic bownstrearT Size Invert Invert Slope n System Capacity Design Ground Grade Ground Elevation Elevation (ft/ft) Flow (cfs) Capacity Elevation Line In Elevation (ft) (ft) (cfs) (cfs) (ft) (ft) (ft) 30 inch 286.05 285.95 0.010460 0.012 115.60 90.89 -24.71 291 .14 288.56 288.95 30 inch 286.45 286.15 0.009891 0.012 115.02 88.38 -26.64 291.14 289.11 291.14 30 inch 290.36 286.55 0.020041 0.012 111 .11 125.80 14.69 294.11 292.72 291 .14 30 inch 292.00 290.83 0.020069 0.012 111 .28 125.89 14.61 295.64 294.36 294.11 © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA +1-203-755-1666 Hydraulic Grade Line Out (ft) 288.33 288.56 289.11 292.82 Velocity Out (ft/s) 11 .99 11 .86 11 .32 13.28 StormCAO v4.1 1 [4.2014] Page 1 of 1 Scenario: Base 50F 0? [,95 251 250 90 -> 249 248 Title: Castlerock -All Phases g:\ .. \drainage\storrnc.:Hf\ph 1 systen1 5 stn1 StonnCnu v4 1 1 1·1/.'O1 41 07112107 09 OB ~)J PM 'j~' l·l;-1•'.!s.lacl r\/lelhocJs. In c ::.1 i~f(_1r1V.s1de r~oacl VVaterl)ury c I tHii'08 US/\ I 1 20:.\ .. ?'.1'.:1-lGSfl P;;u:.~ 1 ,_,f 1 Label UpstrearT Jownstrearr Length Number Node Node (ft) of Sections 5PO 248 249 31 .24 1 5P1 249 250 45.02 1 5P2 250 252A 292.06 1 5P3 251 252A 76.47 1 5P4 252A 2528 33.42 1 5P5 2528 259 30.95 1 5P6 259 50F 80.12 1 Tille Castlerock -All Phases g I ldrainage\stormcad\ph 1 system 5.stm 07/12/07 09:14:38 PM Scenario: Base Pipe Report Section Upstrearr Downstrearr t:onstructec Manning~ Total Design Excess Upstream Hydraulic Size Invert Invert Slope n System Capacity Design Ground Grade Elevation Elevation (tuft) Flow (els) Capacity Elevation Line In (ft) (ft) (els) (els) (ft) (ft) 18 (-25%) 287.89 287.57 0.0102 0.012 2.75 7.85 5.10 293.06 288.55 24 inch (-25' 287.07 286.62 0.0100 0.012 5.63 16.70 11 .06 292.95 287.95 24 (-25%) 286.52 282.38 0.0142 0.012 10.79 19.88 9 09 291 .86 287.75 18 (-25%) 284.34 282.88 0.0191 0.012 3.07 10.71 7.65 288.34 285.04 30 inch 281 .88 281 .64 0.0072 0.012 15.93 37.65 21 .73 286.78 283.23 30 inch 281 .54 281 .36 0.0058 0.012 18.12 33.89 15.76 286.53 282.98 36 inch 280.86 280.08 0.0097 0.012 20.27 71 .29 51 .02 286.52 282.31 © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA +1-203-755-1666 Pownstrearr Hydraulic Ground Grade Elevation Line Out (ft) (ft) 292.95 288.11 291 .86 287.75 286.78 283.29 286.78 283.36 286.53 282.82 286.52 282.68 288.00 281 .21 Velocity Out (!Us) 5.30 3.47 8.61 6.98 7.02 6.87 8.35 :::,tormCAU V4. I I l'<.dJ '"l Page 1 of 1 Label UpstrearT Pownstrearr Length Number Node Node (ft) of Sections SPO 248 249 31 .24 1 5P1 249 250 45.02 1 5P2 250 252A 292.06 1 5P3 251 252A 76.47 1 5P4 252A 2528 33.42 1 5P5 2528 259 30.95 1 5P6 259 50F 80.12 1 Title: Castlerock -All Phases g I ldrainagelstormcad\ph 1 system 5.stm 07112107 09: 15:02 PM Scenario: Base Pipe Report Section ~pstrearT Pownstrearr Constructec Manning~ Total Design Excess Upstrearr Hydraulic Size Invert Invert Slope n System Capacity Design Ground Grade Elevation Elevation (ft/ft) Flow (cfs) Capacity Elevation Line In (ft) (ft) (cfs) (cfs) (ft) (ft) 18 (-25%) 287.89 287.57 0.0102 0.012 3.29 7.85 4.56 293.06 288.61 24 inch (-25' 287.07 286.62 0.0100 0.012 7.20 16.70 9.49 292.95 288.07 24 (-25%) 286.52 282.38 0.0142 0.012 13.85 19.88 6.03 291.86 287.91 18 (-25%) 284.34 282.88 0.0191 0.012 3.69 10.71 7.03 288.34 285.11 30 inch 281 .88 281 .64 0.0072 0.012 20.17 37.65 17.48 286.78 283.41 30 inch 281 .54 281 .36 0.0058 0.012 24.75 33.89 9.14 286.53 283.24 36 inch 280.86 280.08 0.0097 0.012 27.68 71 .29 43.61 286.52 282.56 © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA +1-203-755-1666 Pownstrearr Hydraulic Ground Grade Elevation Line Out (ft) (ft) 292.95 288.17 291 .86 287.91 286.78 283.44 286.78 283.41 286.53 283.24 286.52 282.96 288.00 281.43 Velocity Out (ft/s) 5.53 3.84 9.12 7.33 6.10 7.46 9.01 Joo -ve.o...r- ;:,tormCAD v4.1.1 [4.2014] Page 1 of 1 Label Upstrearr Pownstrean Length Number Node Node (ft) of Sections P-5 1-5 0-2 64.00 Title: Castlerock Subdivision -Phase 1 B g \ ... \drainage\stormcad\c238-p5.stm 07/13/07 04:39:21 PM 1 Section Upstrearr Jownstrean Size Invert Invert Elevation Elevation (ft) (ft) 18 (-25"/, 297.31 297.06 © Haestad Methods, Inc. Scenario: Base Pipe Report ::;onstructec Manning~ Total Design Slope n System Capacity (ft/ft) Flow (cfs) (cfs) 0.003906 0.012 2.54 4.85 Excess ~pstrearr Hydraulic Jownstrean Design Ground Grade Ground Capacity Elevation Line In Elevation (cfs) (ft) (ft) (ft) 2.31 300.00 297.98 300.00 +1 -203-755-1666 Hydraulic Velocity Grade Out Line Out (ft/s) (ft) 297.69 3.98 Io -Ve.ctr- StormCAL.. ..... 1.1 [<;.LU14) Page 1 of 1 Label Upstream i)ownstrean Length Number Node Node (ft) of Sections P-5 1-5 0-2 64.00 Title: Castlerock Subdivision -Phase 1 B g \ ... \d rainage\stormcad\c238-p5. stm 07/13/07 04:40:08 PM 1 Scenario: Base Pipe Report Section UpstrearT !Jownstrean ~onstructec Ma nning~ Total Design Excess Upstream Hydraulic Pownstrean Size Invert Invert Slope n System Capacity Design Ground Grade Ground Elevation Elevation (ft/ft) Flow (cfs) Capacity Elevation Line In Elevation (ft) (ft) (cfs) (cfs) (ft) (ft) (ft) 18 (-25°/. 297.31 297 06 0.003906 0.012 3.42 4 .85 1.43 300.00 298.12 300.00 © Haestad Methods. Inc. 37 Brookside Road Waterbury, CT 06708 USA +1 -203-755-1666 Hydraulic Velocity Grade Out Line Out (ft/s) (ft) 297.80 4.41 lov -Vt.ll ,,.-- StormCAD v4.1.1 (4.2014] Page 1of1 APPENDIXD Post-Development Drainage Area Map