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Home My WebLink AboutDrainage ReportDrainage Report for Castle Rock Subdivision Phase 2B College Station, Texas September 2008 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) 7 64-77 43 Drainage Report -Executive Summary Castle Rock Subdivision, Phase 2B College Station, Texas September 29, 2008 ENGINEER Civil Development, Ltd. -Ginger Urso, P.E. (ginger@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 DESCRJPTION AND LOCATION This project consists of the development of Phase 2B of the Castle Rock Subdivision in College Station. Phase 2B is a single-family residential development, which will include the construction of utilities and infrastructure. Phase 2B is located to the north of Phase IA of the Castle Rock development. The entire site lies within the corporate limits of the City of College Station. This 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 adjacent to this tract to the north. Area: 8.6 acres Existing Land Use: Vacant Proposed Land Use: Single-Family Residential Number of Lots: 24 residential Drainage Basin: Spring Creek Tributary A FEMA FIRM: #48041 C0205 D, dated 2/9/2000 Floodplain: A portion of this phase of the development lies within the floodplain. HYDROLOGIC CHARACTERISTICS The existing site is predominately wooded. The elevations range from 276 to 293 , sloping in generally northeasterly and northwesterly directions, 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. GENERALSTORMWATERPLAN The drainage plan for this development will involve the installation additional pipes, inlets & junction boxes, which will collect and transmit the runoff into existing drainages which flow across the adjacent tract and then into Tributary A of Spring Creek. The detention pond for this proposed development is located on the Crowley Tract. COORDINATION & STORMW ATER PERMITTING The project will require that a Notice of Intent be submitted to the Texas Commission for Environmental Quality. No other permits are anticipated for this project. Page 1 of2 The following items comprise this drainage report for this project: Executive Summary Technical Design Summary Appendix A -Drainage Area Calculations Appendix B -Depth of Flow in Gutter Appendix C -Storm CAD Pipe & Inlet Analysis Appendix D -Channel Design Data Appendix E -Drainage Area Map (Exhibit A) CERTIFICATION Page 2 of2 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Start (Page 2.1) Enaineerina and Desian Professionals Information Engineering Firm Name and Address: . Jurisdiction City: Bryan Cl v~ l lX \f do~&vJ-1 Lt-d f ,o. &x ll<124 k::::: College Station Co l 1-e~~ st-~-t-1 e..-11 TY ·1 19>U,2. Date of Submittal: Lead Engineer's Name and Contact lnfo.(phone, e-mail, fax): Other: (::_ ' u ? f: Cf71 -70£1-77'-13 -~, 1 r'lj-l '< Y t;..0 1 ' -• ex< 'nc;rVt-@ c..d £/o l.. 5 • c ~ ..... Supporting Engineering I Consulting Firm(s): Other contacts: -- Developer I Owner I Applicant Information ., """ Developer I Applicant Name and Address: Phone and e-mail: bv-~~ ·-pr-o .. ~v-~ Iw-1ve.-;-fov-.s1 L..LL 4¥10 U...s-1-L_.,,pe. 'th-iv<_ 97t::t-ro10-72-~o ( 0 !l-e.Ae.. 5-t-Ati 0--.-._ -rx: ·11~4-" Property Owner(s) if not Developer I Applicant (&address): Phone and e-mail: Ld e"' J o p--e-.-) - Project Identification Development Name: ~ <7 tLt_ 'j2_ot:l:_ ~(' vc' fu -.~--...-> / ?/, ~ $.-e_ 2...3 Is subject property a site project, a single-phase subdivision, or part of a multi-phase subdivision? tb 1.!IJ -h' -e. ~ C-R--r If multi-phase, subject property is phase 4-of q Legal description of subject property (phase) or Project Area: (see Section II , Paragraph B-3a) 8 -0l I AL.-r.e...S ov..f.. ,;{ -ft...t.-:t:o k.+-Sf~ v--e-n ~ £.u,_.~ / 4 -s;-'+- 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. \/h o.~.; lA-1 U3 '\ Le~ C:.~-r---~{J. ·:phcd ... e_ d..A-C:s V\...e..k:...~~ C '--sr---i' .P ~ :f 1. J-.~1 , General Location of Project Area, or subject property (phase): vJ : il ( ·P\-vr-. I> . ~ \~f c,i-P~wJJ nDv+l-, of. -U.-t-Co.._<.,flc_-J.,,_fe Su~cl1 'v1Sit"r In City Limits? Bryan: ....,..._ acres. College Station: ~ .. L, l \ acres. STORMWATER DESIGN GUIDELINES Effective February 2007 Extraterritorial Jurisdiction (acreage): -Bryan: -College Station: Acreage Outside ETJ: - 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: W ,· LLt ·.?.-.,.,, b , J:i'+-cL ~cvJ,._we:J p~,?l~ 2-A/ &. s+kl?..or.1:5<Lbd /vi's t~.) ~ sft.t_ 1?-acL "?~vu~ C ,-11 P~\c__ (r~t of f'>h I A-1 Gx "'* 0>o Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): \f'\oM. w l '-fh.~,... ---fh..~s ~~ ~-yn· n"(j-C v ~_, . .. Platlnformation For Project or Subject Property (or Phase) . Preliminary Plat File#: DJ-5001 ~2. Final Plat File #: ,,...-. Date: ---· Name:~ ?ti.L f2-oc.k_ ~ivt'. ~ ... t~ Status and Vol/Pg: - If two plats, second name: File#: Status: rJ/A. Date: .... Zoning Information For Project or SubjectProperty (or Phase) . Zoning Type: vu Existing or Proposed? Case Code: Case Date Status: Zoning Type: -Existing or Proposed? Case Code: Case Date Status: .. ,,, . ... ... .... ... ... . . . .... '·•·-· ... .. Stormwate.r llJlanagement Planning For Project or Subject Property (or f>hase) .. Planning Conference(s) & Date(s): Participants: rJ/A ---- Preliminary Report Required? tJf± Submittal Date Review Date ( Review Comments Addressed? Yes µ/4 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. ~/A 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 Dept. Contact: Date: Subject: With Other Departments of Ji I//\ Jurisdiction City (Bryan or , "" /l I College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non-jurisdiction City Needed? v Yes No ---- 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 i/ ---- Coordination with Summarize need(s) & actions taken (include contacts & dates): T AMUS Needed.? 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 Permitted or Approved? US Army Crops of Engineers No Yes v ,A.p pi--t>v-<J -- US Environmental Protection Agency No v Yes - Texas Commission on G-e..~~ Environmental Quality P~-t No --Yes V"" )"')0000 Brazos River Authority No--1.L._ Yes _ STORMWATER DESIGN GUIDELINES Effective February 2007 Status of Actions (include dates) N o ~ ... J-h~ A-&-h'[h, ~f .. ~-v f ~e-+ CM'l"-P lA.tt.-E-w / fµv-..fyv~+ • N ~I +o be_ f5/l) ~ "'4 &t,_frcJv- Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro12ertv Characteristics I Start (Page 3.1) •. Nature and Scope' of Proposed Work . Existing: Land proposed for development currently used, including extent of impervious cover? r o ~ -'{Pl..{__,.,___.,__ f 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 ~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. s-f,_u_fs =-/~'1 f ~ Size of Pro12osed 2-~ r esr"d-e"'"-f..;c ... .I Jt:?-f ~ !?... .Qc.u ' ::: ?-4-a{_ x lfo'1t (_f Project D~·--,b'-'51-Es~ .. .fs. =:.. o LP Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? ;J /A ~No --Yes . FEMA Floodplains · .: , .. Is any part of subject property abutting a Named Regulatory Watercourse I No , . Ye (Section II , Paragraph B1) or a tributary thereof? ~ s __ Is any part of subject property in floodplain JNo_L Yes Rate Map 1../-9, o'+ l (!. Q'ZoS-t> 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 N/A Yes -- If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA- approved Flood Study to define allowable encroachments in proposed areas? Explain . Af(A STORMWATER DESIGN GUIDELINES Effective February 2007 Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Property 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? Yes Reference the study (&date) here, and attach copy if not already in City files. --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 is part of multi-phase project, provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. Do existing topographic features on subject property store or detain runoff? ~No Describe them (include approximate size, volume, outfall, model, etc). Any known drainage or flooding problems in areas near subject property? ~No Identify: __ Yes __ Yes Based on location of study property in a watershed, is Type 1 Detention (flood control) needed? (see Table B-1 in Appendix B) (M-..e~J frov1·k~{) __ Detention is required. __ Need must be evaluated. ~Detention nit required. What decision has been reached? By whom? If the need for Type 1 Detention How was determination made? must be evaluated: - STORMWATER DESIGN GUIDELINES Effective February 2007 Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~ertv Characteristics I Continued (Page 3.3) ./ HydrologicAttributes of Subject Property (or Phase) (continued) Does subject property straddle a Watershed or Basin divide? ~No --Yes If yes, describe splits below. In Part 4 describe design concept for handling this. Watershed or Basin Larger acreage Lesser acreage ------------·-----r ... -' ~- Above-Project Areas(Section II, Paragraph 83-a) Does Project Area (project or phase) receive runoff from upland areas? v No ~Yes Size(s) of area(s) in acres: 1) 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), small creek (non-regulatory), regulatory Watercourse or tributary); Dn5d.e.. a•e.aS -;--~+-f{&zJ ~ c~+ra:l;.e.-d -fit;-.J. ~If lP--vi?'4 ttv--e_e<..> cn--.e. ~/y-e~/ ~lo~cl_:~/Ci.n.c/ 'rl..LV>of.{ ls c..apfu....-.ed t,-, e ~ ':f,J 5fvrw. AQ_,t.-._0'6 sy!.:f~" Flow determination: Outline hydrologic methods and assumptions: K-o..~·s-r.J ~,,...i,·V>'1 ~1 -1--o cl-e:f ~~"'-il.-r~ .. of r, Does storm runoff drain from public easements or ROW onto or across subject property? _L_No --Yes If yes, describe facilities in easement or ROW: Are changes in runoff characteristics subject to change in future? Explain ~~> c.~Y\s<f-r~.,_c--f zd. ~":(r<-/1~ ~,.~ wdA -<-~~~J.L h.e_ refYlt>lL-e.c{ w i -1-h t..<.. V\b'L OC.~.d P1 ~ -'l. .S ~-'U... pve,.,,_<;..L.-:::. a..hJ... c..w....,,,S Jn--u_c.::t Conveyance Pathways (Section II , Paragraph C2) Must runoff from study property drain across lower properties before reaching a Regulatory Watercourse or tributary? No t,../ Yes Describe length and characteristics of each conveyance pathway(s). Include ownership of property(ies ). r ~J0'-1f tV1,L. .A!-"f-('s-h"(f ~V-~t-l~(. c.£,C{_k..~ S Dr d.-d -fC,---v OJ-i..e_c{_<_,. o~sl,yi of f.-CLc+ t.) +!.<-{/~ of· c.1r~t-s.le>i>J STORMWATER DESIGN GUIDELINES Effective February 2007 Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ IY! SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3-Pro(2ertv Characteristics I Continued (Page 3.4) ' . :: ~: :L~','j;';, ::',Hycff91~9'i~ A~fri,tj~tE{s 'ot .su bj'ect .Ffop~rty < oE i:ila~el "(~:~~tiriue'cii.:.;::i:··!":::.:::: '· ·" ~· .:-·. !' ·.\::,'.,: jl 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 t d') ~ .. ~ I (Y"o~~ -Areas /~ c-~ ~.-AA~"'--if-.5 '-fi....J ClA...Q._, ~-cc-ll. ~oo PL-J ~..._:f c.-0-fv.-r~ ~ -tx-z's;-A ',6 -Pf~~ +2k lJ 1'.-> '¥-v· ~-;r C--..sU-L -I.-<~ )J,-• Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). ;J~ Nearby Drainage Do any of thV have hydrologic or hydraulic influence on proposed stormwater Facilities design? 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. , . Fl~~; /vin---. vf (~ AAL'~~ l.; C"'-fl..__r--LJ ~ ~>4-JA'r'-j ·. 5t-ov-~ ~ >0>f£vvi 1 ~ iv~~~----hLS ~" -h ~ I~ pos,.u;I ~s +~ -f;r_ -//.;_:, ~'-k .-"f1vt 5 p C-_~ &.;1 'L( h .(__ { 'f'-f-o ~-+Vt-'(£ ,J..._ ~ - Discharge(s) To Lower Property(ies) (Section II , Paragraph E1) Does project include drainage features (existing or future) proposed to becOme public via platting? v 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 provide status of ac · ns on each. (Attached Exhibit# ) »/A Scenario 2: Provide general description of how release(s) will be?aafiaged to pre-development conditions (detention, sheet flow, partially concentrated , e/ ached Exhibit# l / Combination: If combination is 7 explain how discharge will differ from pre- development conditions at the prope line for each area (or point) of release. // .. ~./ If Scenario 2, or Combination are to be used, has proposed design been coordinated with owner(s) of re~eiving property(ies)? documenta.tioh. ,. / STORMWATER DESIGN GUIDELINES Effective February 2007 No Page 10 of26 --Yes Explain and provide APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters J Continued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi-Phase Project Will project result in shifting runoff between Basins or Identify gaining Basins or Watersheds and acres shifting: between i--,-W-h_a_t -de-s-ig-n-an_d_m-it-ig-a-tio-n-is_u_s_e_d-to-co-m-pe_n_s_a-te_f_o_r .,...in-c-re_a_s_e_d-ru_n_o_ff.,.-------i Watersheds? from gaining basin or watershed? V--No __ Yes How will runoff from Project Area be mitigated to pre- development conditions? Select any or all of 1, 2, and/or 3, and explain below. 1. _!:::::___With facility(ies) involving other development projects. 2. __ Establishing features to serve overall Project Area. 3. __ On phase (or site) project basis within Project Area. 1. Shared facility (type & location of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit# ) 1>-t.. 4-~-+,·it--"' j> o..-...J ~.--... C.. v-o...; L-i T'r.:,_c;J cfa-. . .J""V"\..£-/-v--L-.. ~ ~'V-\ s ' t+ -l. . 2. For Overall Project Area (type & location of facilities): (Attached Exhibit# ) 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. Are aquatic echosystems proposed? __!::::::'.'.._No project(s)? __ Yes In which phase(s) or Are other Best Management Practices for reducing stormwater pollutants proposed? __ No .......-Yes Summarize type of BMP and extent of use: h'i A.Ao n.......J. <-h. ~a ?Si-1-1-f~v---ce, J........0-~~ks 1 ~c..L •nr.-c---F If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications_, check type facility(ies) and explain in later questions. __ Detenti;;:;~iements ·----_ .. _. _Conduit elements __ Channel features __ Swales __ Ditches -~J~ ---=-Valleygutters __ Outfalls -~...featares--Bridges -~ -...__ Other STORMWATER DESIGN GUIDELINES Effective February 2007 Page 11 of26 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 CC?ncept (continued} .( Within Project Area Of Multi-Phase Project (continued} Will Project Area include bridge(s) or culvert(s)? _..i.:::::::::: No __ Yes Identify type and general size and In which phase(s). If detention/retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): b-e -1-L-.----h; r.-.. !.-1./A S pn-.e_vi' oJS1 ~ 5 f.--,_,._c_f J - 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? _L 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? J Surfaces? C'-· ........ ,, l:l Q) (/) SteepesU~ide slopes: Usual front slopes: Usual back slopes: (/) :::J Q) --·......_~·- ---·--------(/) >----...... ~ Q) I ..c Flow line slopes: least--._ l)pical distance from travelway: g --'(Attached Exhibit# ) l:l '·-....._, __ . .. Q) typical greatest :2 0 ~-.. -, ........... z ___ .... (/) ........ · -........... _ l~ ' ., ~·,.. ·~ Are longitudinal culvert ends in compliance with 8-CS Standard Specifications? ..... .Yes -No, then explain: '--....... _____ <{ ~- (/) At intersections or otherwise, do valley gutters cross arterial or collector streets? .c Q) \/" No Yes If yes explain: :s C'-· >--- u l:l 1 £ ~' ·-:::J 3: ..... Are valley gutters proposed to cross any street away from an intersection? (/) Q) ID =§ o V No Yes Explain: (number of locations?) ~ ciz --iii l:l I Q) c ..... ctl <{ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 12 of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.4) ·. .. . . . .. .• Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) C'-· ""O Q) Ul Ul Q) :J >- ! 1 Ul c -~~ ~-----------------~ Gutter line slopes: Least 0 .. 2 % Usual Q ~ 3 7o Greatest i · ~ k_, Are inlets recessed on arterial and collector streets? V' Yes identify where and why. __ No If "no'', Will inlets capture 10-year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? -.J:::::::... Yes __ No If no, explain where and why not. Will inlet size and placement prevent exceeding allowable water spread for 10-year design storm throughout site (or phase)? ~Yes __ No If no, explain. $-u.--~x B Sag curves: Are inlets placed at low points? _.t::::_ Yes __ No Are inlets and conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? _.i.::::::._ Yes __ No Explain "no" answers. Will 100-yr stormflow be contained in combination of ROW and buried conduit on whole length of all streets? ~Yes __ No If no, describe where and why. Do designs for curb, gutter, and inlets comply with B-CS Technical Specifications? v · Yes __ No If not, describe difference(s) and attach justification. Are any 12-inch laterals used? ~No used. __ Yes Identify length (s) and where Pipe runs between system I Typical Longest access points (feet): ---------- Are junction boxes used at each bend? v Yes and why. __ No If not, explain where i I f----------------------,-,-----:--:----c-:-~ 00 Are downstream soffits at or below upstream soffits? Least amount that hydraulic ~ Yes _lL_ No __ If not, explain where and why: grade line is below gutter line (system-wide): STORMWATER DESIGN GUIDELINES Effective February 2007 Page 13 of26 ~~~-x_c__, APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.5) .. . .. . . .. Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Cil Describe watercourse(s), or system(s) receiving system discharge(s) below QJ (include design discharge velocity, and angle between converging flow lines). (.) c:: 1) Watercourse (or system), velocity, and angle? Cll U5 1)....-,..A,..,~.t. c~~ j_ o/ _ _:,_0.Pd-..cA-:f-5. 1'r..fc .... ~ .... ex...."5/,'ci dr<u_~, c:: ~ ~·s ~ ~..e"'~ ~ s/rN"r' ~ f:..,...,_,Pf.o.~ .iA Lh. · .-c::U,..,_ -K=> -a AP L , I~ ( D A -f-o .Ji.,, .,,._ { f, ......_ ~ .d .l." { c_ t-, ~'Y'...-#t,/ /.){)) ;,.._;;f--a1 E 1) Watercourse (or system), velocity, and angle? :::J .... '1)v-,.v1.' '"'"if-Cf-.. c-~rvJ. 2... tL<..'s. c...h o-::-11-~ l',,._,f0 ~ S0c.~ ..L-1£.-< S~ c:: 0 ~ ·--c . ~t>...i',.._,.__CJc_, e·LS Ch&u~ .11 bo~ o.f. ..,.;-Jv.C./,,, t.dt>rr>a...:l:L~ ~ 0 .E ~-~ 14> ~ ~'.'1 {2r-_,u_J;:_ I re J;i.....AcJ•;t--A· v E ai ~ ai E ~ 3) Watercourse (or system), velocity, and angle? -Cll (/) (/) l)~';-..o~C?~ 3 ~~~ ~ c:L1.~~o..-'Jf;,_,-P,-;v>-n in' QJ :::J c:: :g 0 '<!!/!!._ . ~ Zf!r. dos..e_.,_...1° N ~5~3~ pot,,.;/ r . ~-L ·-> ~ e de. \K.-~ W<t LI vJ h rr>P..::t ~ ~ d-.t>"'-'~ ,·.,. 5~v--C ..--k. 1h b A "O c. E -For each outfall above, what measures are taken to prevent ero~ion or scour of .... QJ 0 QJ receiving and all facilities at juncture? -..c:: Cl) (/) QJ 1) v-oc.k. n ' p v-"'--P 1 ~s s ro (ij c. 2) r-oc b.. v-t p·rf J ~r·"'--5. S QJ (/) c:: 3) r-oc..L .r-1° pr"'--f / ()'r"l....5...5 ~ Are swale(s) situated along property lines between properties? __ No __ Y.eS Number of instances: For each instance answer the following questions?" / Surface treatments (including low-flow flumes if any): ./ C'-· / (/) Q) ~ (/) -QJ Flow line slopes (minimum and max~ (/) >-c:: ! I a1 0 UlZ Outfall characteristics for each (.yefocity, convergent angle, & end treatment). :::J i1 / (/) QJ ~ Will 100-year deSign storm runoff be contained within easement(s) or platted drainage R7rrSfances? __ 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(2t and Design Parameters I Continued (Page 4.6) ./ ~tormwa~er Manage111ent Concept(continued) .. Within Or Serving Subject Property (Phase, or Site) (continued) (/) Are roadside ditches used? __L_ No __ Yes If so, provide the following: Q.) Is 25-year flow contained with 6 inches of freeboard throughout ? ·~ ..c .B Are top of banks separated from road shoulders 2 feet or more? ~ __ o 0 Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes __ No Q.) '.'Q For any "no" answers provide location(s) and explain: -(/) "'C <ti 0 ~----0::: If conduit is beneath a swale, provide the following information (each instance). J /A Instance 1 Describe general location, approximate length: (/) Q.) >-., I~ Is 100-year design flow contained in conduit/swale combination? _Yes /o If "no" explain: c 0 <ti Width / z iii Space for 100-year storm flow? ROW Easement \1'~ Swale Surface type, minimum Conduit Type and size, minim7maximum 0 and maximum slopes: slopes, design storm: :;:; C'-· '6 (/) (ii "'C <ti c >. Inlets Describe how conduit is loaded (from streetslsto7, inlets by type): c <ti c ..c <ti C.J .... c .E Q.) c Cl. 0 0 :.;::; Access Describe how maintenance access i7 (to swale, into conduit): -<ti 0 E :J .... ~ .E c .!: Q.) "'C E Instance 2 Describe general location, app)'(Sximate length: Q.) <ti / (/) (/) :J (/) Q.) c "'C .Q "> Is 1 DO-year design flow contai7 onduiUswale combination? Yes No 1ii 0 ----.... If "no" explain: c Cl. Li (ii E Q.) Space for 100-year storm Jlefw? ROW 0 ..c Easement Width C.J (/) ..... Q.) Swale Surface ~imum Conduit Type and size, minimum and maximum :J 1ii "'C .... and maximum slope . slopes, design storm: c <ti 0 Cl. C.J Q.) --(/) Inlets 7how conduit is loaded (from streets/storm drains, inlets by type): ~ c <ti .E?, ::: (/) Q.) .... <( Acce.s'S Describe how maintenance access is provided (to swale, into conduit): / / STORMWATER DESIGN GUIDELINES Effective February 2007 Page 15 of26 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. 7) .. ... ····· . . .... <Stormwa.ter Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) .!:: co E~ If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surfacing: / 0 w .::: tg ui Is 100-year design flow contained in swale? __ Yes __ No l,s/swale wholly c >-<V within drainage ROW? Yes No Explain "no" answers: .; !~~~~-=-~~~~~~/~~~~ i ~I ~A_c_c_e_s_s_D_e-sc-r-ib_e_h_o_w_m_a~i:~te~;~:~\_c•~·~-a-cc_e_s_s-is~pr~~-v-id_e_:--------------i -~ C'-· Instance 2 Describe genetfOoc/~tion , appro}'imate length, surfacing: :J (J) .0 c :5 Q) o E ~ ~ Is 100-year design flow contaiA€d in swale? __ Yes __ No Is swale wholly (J) ~ within drainage ROW? / Yes __ No Explain "no" answers: 1~ ./ (J) 0 :::: ~ Access~7escrib 1low maintenance access is provided: s ,g .0 :J c. ('o· "O c ~ co 8.. c. 0 x ,_ w c. .!!! ~ c >-H c. E ~ (ii c c co ..c (.) I Instance 3, 4, etc. If swales are used in more than two instances, attach sheet pf6'viding all above information for each instance. "New" channels: Will any area(s) of concentrated flow be channelized (deepened, widened, or straightened) or otherwise altered? No ~Yes If only slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. Will design replicate natural channel? __ Yes ~No If "no", for each instance describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year design flow, and amount of freeboard: Instance 1 :L.,k~ i_ L,.> ~o..-f£.t..,_-<-£\ ~ -f-o ""-"'~ s-f.on-....., pn'~ ~~~ -h:w--fh 215. Instance 2: c'• I -. ' . t) ..., . . II I • A--n {', r J -~~ ..,,:_ vvc l"'-"'-<--ci-e.£1~ ~o-.J ~ "T""-"-~r -L- ri' 'bl---.f _ c{-.....;c>..~J. tu~ ~(-r,r,-.,.... ("')-;K i.vl.[{ -::_/~,_fi1;; k lnst~it:---:-~~~J-<Jo~J ' , . ~ '3 W'L l l bz c}-...Lc~~ &o"''°i "':~~~r.Q_., Y-'kt -of'.:'""'-'~. 0h..~ ';;for•'n.-f">~ ~(.,( ~~-~h< f ~-<_J_ l-->-v ~~ ~.,,.,~,:;{ ';, f V I 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 Conce12t and Design Parameters J Continued (Page 4.8) Stormwater Management Concept (continued) . . Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels {small creeks}: Are these used? ---l.::::::._ No -7 If "yes" provide the information below. Will small creeks and their floodplains remain un~7S __ No How many disturbance instances? Identify each planne. ocation: For each location, describe length and gener9l1'ype of proposed improvement (including floodplain changes): / // rJ /Jx For each location, ~ribe section shape & area, flow line slope (min. & max.), surfaces, and 1 oo,,. ear design flow. _,,/ ./ 'O // Q) / :::J c c Watercourses {and tributaries}: Aside from fringe changes, are Regulatory 0 Watercourses proposed to be altered? ~ No Yes Explain below. ~ -- (/) 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 > 0 and data. Is full report submitted? Yes No If "no" explain: ,_ --a. E IV /A Q) c c cc 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. t-1 'jj, /, Will 100-year flow be contained with one foot of freeboard? --Yes --No If not, identify location and explain: Jll /A Are ROW I easements sized to contain channel and required maintenance space? --Yes --No If not, identify location(s) and explain: N !~ 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) ~tormw~ter Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) (! iro,...; k,._, J)-ef ..L,,,,,_,f) iYI. 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% I 100-yr volume: free flow & plugged / Design discharge (10 yr & 25 yr) / Spillway crest at 100-yr WSE? __ yes --no __ yey'. __ no Berms 6 inches above plugged WSE? / __ yes --no __ yes --no Explain any "no" answers: I I I I IJl I I (I) rJ ,!x. >-!' I I For each facility what is 25-yr design Q , and design of outle.t structure? 0 Facility 1: I z v/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 't:J (I) If "no" explain: IJl 0 c. e c.. IJl For each, what is velocity of 25-yr design, discharge at outlet? & at s12illway? ~ Facility 1: & Facility 2: & '(3 (I] Are energy dissipation measures used? No Yes Describe type and u.. ----c location: / 0 ~ / (I) al 0 (I) ,· L.. For each, is spillway surface treatment other than concrete? Yes or no, and describe: <( Facility 1: / I Facility 2: I For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: / Facility 2/ If be's are used give heights, slopes and surface treatments of sides. Fzl1ty 1: p cility 2: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 18 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 4.10) .. . 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; ~; Ul ~ =u (.) Q) Facility 2: Cll ::J LL. c: c: ·-oc :.;::; 0 c: u .-· Q) -For additiq_nal facilities provide all same information on a separate sheet. (ii 0 Are.,park-ing areas to be used for detention? __ No --Yes What is ~m·aximum depth due to required 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'-· ~ I~ / Ul / Cl I c: / Ul Are culverts parallel to public roadway alignrry,ent? __ Yes No Explain: Ul 0 --L.. Ul / u Q) Q) , iii >-/ > I / ·;:: Creeks at Private Drives: Do private·driveways, drives, or streets cross drainage c. iii ways that serve Above-Project areas or are in public easements/ ROW? "O 0 No Yes If "yes" provide information below. Q) z ----Ul ,, ~../ How many instances? Describe location and provide information below. Q) Location 1: ~ ::J u Q) Location 2: ~ Location 3: / ,/ For' each location enter value for: 1 2 3 / Desig9,year passing without toping travelway? / Water depth on travelway at 25-year flow? / lfiater depth on travelway at 100-year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Effective February 2007 Page19of26 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 4.11) ' ', ' Stormwater Management Concept (continued} ,', ' Within Or Serving Subject Property (Phase, or Site} (continued} Named Regulatort 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) Q) No Yes How many instances? For efuch identify the ..c <ll --/ Q) location and provide the information below. <ll (ii Instance 1: Q) ..... >-~ I~ Instance 2: Instance 3: c 0 o~ ZE Yes or No for the 100-year design flow: 1 2 3 vii Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? E C'-· co Is velocity limited per conditions (Table C-11 )? <ll <ll \" g>-c Explain any "no" answer(s): \ \< ·-c ~ co 0 c ~ ..... 0 u:..;:::: >-co i co CJ S: .Q -c Q) co .c Q ._ .......... Minor Collector or Local Streets: Will culverts serve these types of streets? CJ CJ No Yes Ho~' many instances? for each identify the ·-<ll -Q) -- ---g -c location and provide the inforr,nation be low: a. Q) ! ..... a. Instance 1: co z. -c >-Instance 2: Q) c / <ll co :::::s_ Instance 3: <ll 0 t <ll I Q) Q) For each instance e~ter value, or "yes" I "no" for: 1 ~CJ 2 3 :::::s c CJ co Design yr. headwa(er WSE 1 ft. below curb top? Q) 1i5 ..... c <( ·-100-yr. max. depth at street crown 2 feet or less? Q) ..... 0 Product of velocity (fps) & depth at crown (ft) = ? E ..... Is velocity limited per conditions (Table C-11 )? 0 ~ Limit of down stream analysis (feet)? Explai~ 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 Concept and Design Parameters I Continued (Page 4.12) . .. Stonnwater 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 --70 ff 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 ~o6ation(s), describe change(s), and justification: ./ Are flumes or conduit to discharge into culvert bqrrel(s)? __ No __ Yes If yes , identify location(s) and provide justification: / / I I I Are flumes or conduit to discharge into of near surfaced approaches to culvert ends? __ No __ Yes If "yes" identif~.location(s), describe outfall design treatment(s): ,/.I f\ / r I\ ~.J \ ,/ Is scour/erosion protection provided to ensure long term stability of culvert structural components, and surfacing,at culvert ends? __ Yes __ No If "no" Identify locations and provide justjfication(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 Page21 of26 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 4.13) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) /,,.-·· Is a bridge included in plans for subject property project? --No __ .Yes If "yes" provide the following information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? rJ I /\ Ul ar Ol ~ co 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: _L.-.. ,/ Is a Stormwater Provide a general description of planned techniques: ~ Pollution Prevention (~+ i) (ii Plan (SW3P) r O\J'U\.~ Pl~"' ::J ::;;_u:..,, 0 established for ..... project construction? Q) 1' t C t.....,, .... s i-V-c...~ ~/>Co--.. "' s ro V Yes s No -- 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? ~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? f\J I; 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 DES IGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.14) . Stormwater Management Concept (continued) ... ... Within Or Serving Subject Property (Phase, or Site) (continued) µ /L\ l Special Designs -Deviation From 8-CS Technical Specifications If any design(s) or material(s) of traditional runoff-handling facilities deviate from provisions of B-CS Technical Sp ecifications, 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) .. ,. .' ' ,. i I\ 4) , ,. ~ I />\ / ,.· ,. 5) / Have elements been.coordinated with the City Engineer or her/his designee? For each item above provide "yef/ or "no", action date, and staff name: 1) 2) 3) 4) .· .. 5) •.• :f .· Design Parameters . .• Hydrology Is a map(s) showing all Design Drainage Areas provided? --..JL.. Yes --No Briefly summarize the range of applications made of the Rational Formula: R1.A..1r-.o\:-.C ~.f;./1..-\.-y"~"'~' ~ -+;y--1_~lt__:;\: ~ r·~ 'S7-o· r-.6 ~J,, ~~Yh c.h<l..-d.s What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? i, s:1r acres Location (or identifier): (_J> ·A· :._-:fl·(~ 7 /-{. . k , . a.. $..L.t f -v ·< l t -/ °'-'-"" """'- STORMWATER DESIGN GUIDELINES Effective February 2007 Page 23 of 26 u APPENDIX. D: TECH. DESIGN SU MMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making det~inations for time of concentration, was segment analysis used? ft° No Yes In approximately what percent of Design Drainage Areas? 5"[) % As to intensity-duration-frequency and rain depth criteria for determining runoff flows, were any criteria other than those provided in these Guidelines used? _L No __ Yes If "yes" identify type of data, source(s), and where applied: fr /c:--::IO ~~ u._s.zJ ~ r~~ t' +: O/L-(__"°'-'.::, • 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 /0 ~ loo lO Storm drain system for local streets l o ~ 100 10 Open channels lo ~ /OD (0 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 -~- 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) ~ B .. ??<t> ~ -2. l,j Lowest (feet per second) -l -'b3 --i,.. {o i Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For conduit type(s) ld:DEC:- STORMWATER DESIGN GUIDELINES Effective February 2007 For street gutters: f2Le Page 24 of 26 o.o\4 Coefficients: 0 -014-D-0( 2._ APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters / Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? /"No Yes Head and friction losses _.!:::.:'...No Yes ----Explain any "yes" answer: /Yes No In conduit is velocity generally increased in the downstream direction? -- Are elevation drops provided at inlets, manholes, and junction boxes? 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: Open Channels If a HEC analysis is utilized, does it follow Sec Vl.F.5.a? l::!J! Yes __ No I Outside of straight sections, is flow regime within limits of sub-critical flow? __ Yes __ No If "no" list locations and explain: rv I [\ 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? tJ /A Entrance, friction and exit losses: fJ/1r- Bridges Provide all in bridge report rJ /A STORMWATER DESIGN GUIDELINES Effective February 2007 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 Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software has been used in the analysis and assessment of stormwater management needs and/or the development of facility designs proposed for subject property project? List them below, being sure to identify the software name and version, the date of the version, any applicable patches and the publisher Part 5 -Plans and Specifications Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section Ill, Paragraph C3. Part 6 -Conclusions and Attestation Add any concluding information here: State of Texas PE No. BCC 503 STORMWATER DESIGN GUIDELINES Effective February 2007 Conclusions Attestation Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ APPENDIX A Drainage Area Calculations Castle Rock Subdivision Phase 28 Drainage Area Summary Area# Area, A c (acres) 207 1.54 0.55 209 0.36 0.55 210 0.53 0.55 211 0.98 0.55 218 0.33 0.55 219 0.27 0.55 220 0.35 0.55 252 0.68 0.55 253 1.42 0.55 253-814 0.93 0.55 253-K4 0.49 0.55 254 0.28 0.55 255 0.30 0.55 256 0.78 0.55 256-A11 0.48 0.55 256-K8 0.30 0.55 257 0.37 0.55 257-K5 0.12 0.55 257-K7 0.21 0.55 258 0.14 0.55 259 0.49 0.55 The Rational Method: tc (min) 23.3 10 14.0 24.1 10 10 10 14.8 22.2 22.2 18.9 10 10 23.2 23.2 18.7 10 10 10 10 10 Q = CIA I = b I (tc+d)8 5 year storm 10 year storm 25 year storm l5 Os 110 010 125 025 (in/hr) (cfs) (in/hr) (cfs) (in/hr) (cfs) 5.028 4.26 5.711 4.84 6.555 5.55 7.693 1.52 8.635 1.71 9.861 1.95 6.597 1.92 7.437 2.17 8.508 2.48 4.931 2.66 5.604 3.02 6.433 3.47 7.693 1.40 8.635 1.57 9.861 1.79 7.693 1.14 8.635 1.28 9.861 1.46 7.693 1.48 8.635 1.66 9.861 1.90 6.419 2.40 7.241 2.71 8.287 3.10 5.169 4.04 5.867 4.58 6.731 5.26 5.169 2.64 5.867 3.00 6.731 3.44 5.652 1.52 6.399 1.72 7.334 1.98 7.693 1.18 8.635 1.33 9.861 1.52 7.693 1.27 8.635 1.42 9.861 1.63 5.041 2.16 5.725 2.46 6.570 2.82 5.041 1.33 5.725 1.51 6.570 1.73 5.684 0.94 6.434 1.06 7.374 1.22 7.693 1.57 8.635 1.76 9.861 2.01 7.693 0.51 8.635 0.57 9.861 0.65 7.693 0.89 8.635 1.00 9.861 1.14 7.693 0.59 8.635 0.66 9.861 0.76 7.693 2.07 8.635 2.33 9.861 2.66 Q = Flow (cfs) A= Area (acres) C = Runoff Coeff. tc = Time of concentration (min) tc = L/(V*60) L = Length (ft 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 vear storm b = 89 d = 8.5 e = 0.754 V = Velocity (ft/sec) 50 year storm b = 98 d = 8.5 e = 0.745 50 year storm 100 year storm 150 Oso 1100 (in/hr) (cfs) (in/hr) 7.446 6.31 7.772 11.148 2.21 11.639 9.635 2.81 10.053 7.309 3.94 7.630 11.148 2.02 11.639 11.148 1.66 11.639 11.148 2.15 11.639 9.387 3.51 9.794 7.644 5.97 7.977 7.644 3.91 7.977 8.320 2.24 8.681 11.148 1.72 11.639 11.148 1.84 11.639 7.463 3.20 7.790 7.463 1.97 7.790 8.365 1.38 8.728 11.148 2.27 11.639 11.148 0.74 11.639 11.148 1.29 11.639 11.148 0.86 11.639 11.148 3.00 11.639 100 year storm b = 96 d = 8.0 e = 0.730 0100 (cfs) 6.58 2.30 2.93 4.11 2.11 1.73 2.24 3.66 6.23 4.08 2.34 1.79 1.92 3.34 2.06 1.44 2.37 0.77 1.34 0.90 3.14 APPENDIXB Depth of Flow in Gutter Calculations Castle Rock Subdivision Phase 28 Depth of Flow in Gutter (Refer to Exhibit A for Gutter Locations) Gutter A Location Area# (acres) A7 210 0.53 AS 218 0.33 A9 211 0.98 A10 219 0.27 A11 256-A11 0.48 A12 256+257+258 1.29 A13 255 0.30 812 207 1.54 813 209 0.36 814 253-814 0.93 815 254 0.28 K2 252 0.68 K3 259 0.49 K4 253-K4 0.49 KS 257-KS 0.12 KS 253+254 1.70 K7 257-K? 0.21 KB 256-KB 0.30 K9 257 0.37 Transverse (Crown) slope (ft/ft) 27' street = 0.0300 38' street = 0.0300 c Slope tc (ft/ft) (min) 0.55 0.0070 14.0 0.55 0.0070 10 0.55 0.0080 24.1 0.55 0.0080 10 0.55 0.0080 23.2 0.55 0.0080 24.3 0.55 0.0080 10 0.55 0.0080 23.3 0.55 0.0080 10 0.55 0.0080 22.2 0.55 0.0120 10 0.55 0.0100 14.8 0.55 0.0100 10 0.55 0.0091 18.9 0.55 0.0091 10 0.55 0.0113 22.8 0.55 0.0113 10 0.55 0.0113 18.7 0.55 0.0150 10 Straight Crown Flow (Solved to find actual depth of flow in gutter, yl: Q = 0.56 * (z/n) * S112 * Yat3 ~ y ={QI [0.56 * (z/n) * S112]}31a n = Roughness Coefficient= 0.018 S = Street/Gutter Slope (ft/ft) y = Depth of flow at inlet (ft) z = Reciprocal of crown slope: 27' street = 33 38' street = 33 10-year storm 100-year storm 1,. Q,. Y1D-•ctual 1, •• Q, •• Y100 (in/hr) (cfs) (ft) (in) (in/hr) (cfs) (ft) (in) 7.437 2.17 0.251 3.01 10.053 2.93 0.281 3.37 8.635 1.57 0.222 2.66 11.639 2.1 1 0.248 2.98 5.604 3.02 0.277 3.32 7.630 4.11 0.311 3.73 8.635 1.28 0.201 2.41 11.639 1.73 0.225 2.69 5.725 1.51 0.214 2.56 7.790 2.06 0.240 2.88 5.578 3.96 0.306 3.68 7.595 5.39 0.344 4.13 8.635 1.42 0.209 2.51 11.639 1.92 0.234 2.80 5.711 4.84 0.330 3.96 7.772 6.58 0.371 4.45 8.635 1.71 0.224 2.68 11.639 2.30 0.250 3.00 5.867 3.00 0.276 3.31 7.977 4.08 0.310 3.72 8.635 1.33 0.189 2.26 11.639 1.79 0.211 2.53 7.241 2.71 0.255 3.06 9.794 3.66 0.285 3.43 8.635 2.33 0.241 2.89 11.639 3.14 0.269 3.23 6.399 1.72 0.219 2.63 8.681 2.34 0.246 2.95 8.635 0.57 0.145 1.74 11.639 0.77 0.162 1.94 5.781 5.41 0.323 3.87 7.864 7.35 0.362 4.35 8.635 1.00 0.171 2.06 11.639 1.34 0.192 2.30 6.434 1.06 0.175 2.10 8.728 1.44 0.197 2.36 8.635 1.76 0.201 2.41 11.639 2.37 0.225 2.70 APPENDIXC Storm CAD Pipe & Inlet Analysis Upstream Down-#of Pipe Upstream Label Node stream Length Pipes Diam. Invert Node Elevation (ft) (ft) 28-1 1-28-2 J-28-2 37.82 1 30inch 278.30 28-2 J-28-1 J-28-2 139.87 1 36inch 278.86 28-3 J-28-2 0-2 160.00 1 42inch 277.18 28-4 1-28-3 1-28-2 41.69 1 24 inch (-25%) 278.93 28-5 1-28-8 1-28-3 40.00 1 18 (-25%) 279.63 28-6 1-28-1 J-28-1 32.10 1 18 (-25%) 280.96 28-7 1-28-6 J-3 130.30 1 18 (-25%) 280.41 28-8 J-3 0-1 91.20 1 24 inch (-25%) 277.96 28-9 1-28-5 50F 80.00 1 30 inch 280.91 28-10 1-28-4 1-28-5 31.00 1 30inch 281.72 5P4 252A 1-28-4 30.00 1 30inch 281 .83 Upstream Down-#of Pipe Upstream Label stream Length Invert Node Node Pipes Diam. Elevation (ft) (ft) 28-1 1-28-2 J-28-2 37.82 1 30inch 278.30 28-2 J-28-1 J-28-2 139.87 1 36inch 278.86 28-3 J-28-2 0-2 160.00 1 42inch 277.18 28-4 1-28-3 1-28-2 41 .69 1 24 inch (-25%} 278.93 28-5 1-28-8 1-28-3 40.00 1 18 (-25%) 279.63 28-6 1-28-1 J-28-1 32.10 1 18 (-25%) 280.96 28-7 1-28-6 J-3 130.30 1 18 (-25%) 280.41 28-8 J-3 0-1 91 .20 1 24 inch (-25%) 277.96 28-9 1-28-5 50F 80.00 1 30inch 280.91 28-10 1-28-4 1-28-5 31 .00 1 30inch 281.72 5P4 252A 1-28-4 30.00 1 30 inch 281 .83 CASTLE ROCK -PHASE 28 PIPE ANALYSIS September, 2008 10 Y A -ear na1ys1s Downstream Mannings Total Invert Slope System Elevation n Flow (ft) (ft/ft) (cfs) 278.19 0.0029 0.014 8.14 277.69 0.0084 0.014 33.13 276.70 0.0030 0.012 40.90 278.80 0.0031 0.012 5.27 279.43 0.0050 0.014 2.44 280.35 0.0190 0.014 6.02 278.46 0.0150 0.012 4.35 277.68 0.0031 0.012 4.30 280.51 0.0050 0.014 20.87 281.47 0.0081 0.014 19.60 281.72 0.0037 0.014 17.03 100 Y A -ear na1ys1s Downstream Mannings Total Invert Slope System Elevation n Flow (ft) (ft/ft) (cfsl 278.19 0.0029 0.014 11 .08 277.69 0.0084 0.014 38.91 276.70 0.0030 0.012 49.51 278.80 0.0031 0.012 7.11 279.43 0.0050 0.014 3.29 280.35 0.0190 0.014 8.19 278.46 0.0150 0.012 5.26 277.68 0.0031 0.012 5.22 280.51 0.0050 0.014 28.06 281.47 0.0081 0.014 26.37 281 .72 0.0037 0.014 21 .61 Full Excess Capacity Design Capacity (cfs) (cfs) 20.54 12.40 56.64 23.52 59.70 18.80 9.33 4.06 4.70 2.26 9.16 3.15 9.49 5.14 9.25 4.95 26.93 6.06 34.20 14.60 23.06 6.03 Full Excess Design Capacity Capacity (cfsl (cfsl 20.54 9.46 56.64 17.73 59.70 10.18 9.33 2.22 4.70 1.42 9.16 0.98 9.49 4.23 9.25 4.04 26.93 -1 .13 34.20 7.83 23.06 1.45 Upstream Downstream Average Ground HGLln Ground HGL Out Velocity Elevation Elevation (ft) (ft) (ft) (ft) (ft/sl 283.45 279.39 284.74 279.31 3.89 284.70 280.51 284.74 279.34 8.33 284.74 279.31 283.50 278.83 6.68 283.45 279.86 283.45 279.73 4.08 282.00 280.29 283.45 280.09 3.58 285.00 281 .73 284.70 281 .12 7.38 285.41 281 .03 283.75 280.24 5.14 283.75 280.24 283.00 280.18 1.83 286.52 282.56 288.00 282.06 6.29 286.53 283.22 286.52 282.84 6.73 286.78 283.37 286.53 283.16 5.59 Upstream Downstream Average Ground HGL In Ground HGLOut Elevation Elevation Velocity (ft) (ft) (ft) (ft) (ft/s) 283.45 279.61 284.74 279.61 4.04 284.70 280.69 284.74 279.61 8.38 284.74 279.61 283.50 279.13 6.94 283.45 280.06 283.45 279.93 4.36 282.00 280.43 283.45 280.23 3.84 285.00 281 .92 284.70 281 .31 7.82 285.41 281 .10 283.75 280.27 5.66 283.75 280.27 283.00 280.18 2.21 286.52 282.97 288.00 282.32 6.93 286.53 283.47 286.52 283.12 7.41 286.78 283.62 286.53 283.42 5.93 Ground Additional Label Elevation Area Inlet C Tc Flow (ft) (acres) (min) (cfs) l-2B-1 285.00 1.90 0.55 23.3 0 l-2B-2 283.45 1.51 0.55 24.1 0 l-2B-3 283.45 0.60 0.55 10 0 l-2B-4 286.53 0.68 0.55 14.8 0 l-2B-5 286.52 0.49 0.55 13 0 l-2B-6 285.41 1.70 0.55 22.8 0 Ground Additional Label Elevation Area Inlet C Tc Flow (ft) (acres) (min) (cfs) l-2B-1 285.00 1.90 0.55 23.3 0 l-2B-2 283.45 1.51 0.55 24.1 0 1-2B-3 283.45 0.60 0.55 10 0 l-2B-4 286.53 0.10 0.55 14.8 0 l-2B-5 286.52 0.77 0.55 13 0 1-2B-6 285.41 1.70 0.55 22.8 0 CASTLE ROCK -PHASE 28 INLET ANALYSIS September, 2008 10 Y A I . -ear na1ys1s Curb Inlet Inlet Type Location Opening Length (ft) Curb BCS-STANDARD In Sag 5 Curb BCS-STANDARD In Sag 15 Curb BCS-STANDARD In Sag 10 Curb BCS-STANDARD On Grade 15 Curb BCS-STANDARD On Grade 10 Curb BCS-STANDARD On Grade 10 100 Y A -ear na1ys1s Inlet Inlet Curb Type Location Opening Length (ft) Curb BCS-STANDARD In Sag 5 Curb BCS-STANDARD In Sag 15 Curb BCS-STANDARD In Sag 10 Curb BCS-STANDARD On Grade 15 Curb BCS-STANDARD On Grade 10 Curb BCS-STANDARD On Grade 10 Gutter Ditch Depth (ft) 0.45 0.23 0.2 0.25 0.20 0.30 Gutter Ditch Depth (ft) 0.56 0.28 0.25 0.33 0.22 0.34 Total Total HGLln HGL Out Bypass Flow To Flow Inlet (ft) (ft) (cfs) (cfs) 281.73 281 .73 0 6.02 279.39 279.39 0 4.69 279.86 279.86 0 2.87 283.22 283.22 0 3.95 282.56 282.56 0 2.09 281.03 281.03 1.1 5.45 Total Total HGLln HGLOut Bypass Flow To Flow Inlet (ft) (ft) (cfs) (cfs) 281 .92 281 .92 0 8.19 279.61 279.61 0 6.39 280.06 280.06 0 3.87 283.47 283.47 0.71 7.89 282.97 282.97 0.08 2.83 281 .10 281 .10 2.15 7.41 APPENDIXD Channel Design Data channel 1--10 year channel calculator Given Input Data: shape .......................... . solving for .................... . Fl owrate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . Velocity ....................... . Full Fl owrate .................. . Fl ow area ...................... . Fl ow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Peri meter ...................... . Percent ful 1 ................... . Trapezoidal Depth of Flow 20.0700 cfs 0.0050 ft/ft 0.0350 24.0000 in 24.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 14.7300 in 2.3662 fps 63.2640 cfs 8.4820 ft2 145.4668 in 8.3965 in 141.8401 in 20.0000 ft2 221. 9091 in 61. 3750 % channel 1--100 year channel calculator Given Input Data: shape .......................... . solving for .................... . Flowrate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . Vel oc1 ty ....................... . Ful 1 Fl owrate .................. . Flow area ...................... . Fl ow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Peri meter ...................... . Percent ful 1 ................... . Trapezoidal Depth of Flow 26.9300 cfs 0.0050 ft/ft 0.0350 24.0000 in 24.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 16.7294 in 2.5496 fps 63.2640 cfs 10. 5624 ft2 161. 9539 in 9.3915 in 157.8349 in 20.0000 ft2 221. 9091 in 69 .7057 % channel 2--10 year channel calculator Given Input Data: Shape .......................... . solving for .................... . Flowrate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . velocity ....................... . Ful 1 Fl owrate .................. . Fl ow area ...................... . Fl ow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Peri meter ...................... . Percent ful 1 ................... . Trapezoidal Depth of Flow 4.3000 cfs 0.0050 ft/ft 0.0350 24.0000 in 0.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 9.7829 in 1.6175 fps 47.0738 cfs 2.6585 ft2 80.6722 in 4.7454 in 78.2636 in 16.0000 ft2 197.9091 in 40.7623 % channel 2--100 year channel calculator Given Input Data: shape .......................... . solving for .................... . Fl owrate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . Velocity ....................... . Ful 1 Fl owrate .................. . Fl ow area ...................... . Flow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Peri meter ...................... . Percent ful 1 ................... . Trapezoi da 1 Depth of Flow 5.2200 cfs 0.0050 ft/ft 0.0350 24.0000 in 0.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 10.5207 in 1.6978 fps 47.0738 cfs 3.0746 ft2 86.7561 in 5.1033 in 84.1657 in 16.0000 ft2 197.9091 in 43.8363 % channel 3--10 year channel calculator Given Input Data: shape .......................... . solving for .................... . Flowrate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . Velocity ....................... . Full Flowrate .................. . Fl ow area ...................... . Fl ow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Peri meter ...................... . Percent ful 1 ................... . Trapezoidal Depth of Flow 40.9000 cfs 0.0035 ft/ft 0.0350 30.0000 in 0.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 24.3422 in 2.4849 fps 71.4094 cfs 16.4595 ft2 200.7307 in 11. 8077 in 194.7374 in 25.0000 ft2 247.3863 in 81.1406 % channel 3--100 year channel calculator Given Input Data: shape .......................... . solving for .................... . Fl ow rate ....................... . slope .......................... . Manning's n .................... . Height ......................... . Bottom width ................... . Left slope ..................... . Right slope .................... . computed Results: Depth ........................... . Vel OCl ty ....................... . Full Fl ow rate .................. . Flow area ...................... . Fl ow perimeter ................. . Hydraulic radius ............... . Top width ...................... . Area ........................... . Perimeter ...................... . Percent ful 1 ................... . Trapezoi da 1 Depth of Flow 49. 5100 cfs 0.0035 ft/ft 0.0350 30.0000 in 0.0000 in 0.2500 ft/ft (V/H) 0.2500 ft/ft (V/H) 26.1501 in 2.6065 fps 71. 4094 cfs 18.9952 ft2 215.6390 in 12.6846 in 209.2006 in 25.0000 ft2 247.3863 in 87.1669 % APPENDIXE Post-Development Drainage Area Map