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Home My WebLink AboutDrainage Report 09-66Drainage Report for Castle Rock Subdivision Phase 4 College Station, Texas November, 2009 Engineer: HARLE ENGINEERING COMPANY P.O. Box 11587 College Station, TX 77842 3002 Texas Avenue South College Station, Texas 77845 (979) 693-7191 Developer: Greens Prairie Investors, Ltd . 4490 Castlegate Drive College Station, Texas 77845 (979) 690-7250 Drainage Report for Castle Rock Subdivision Phase 4 College Station, Texas November, 2009 Engineer: HARLE ENGINEERING COMPANY P.O. Box 11587 College Station, TX 77842 3002 Texas Avenue South College Station, Texas 77845 (979) 693-7191 Developer: Greens Prairie Investors, Ltd . 4490 Castlegate Drive College Station , Texas 77845 (979) 690-7250 ENGINEER Castle Rock Subdivision, Phase 4 Drainage Report -Executive Summary HARLE ENGINEERING COMP ANY P.O. Box 11587 College Station, Texas 77842 Phone/Fax: (979) 693-7191 OWNER/DEVELOPER Greens Prairie Investors, LLC 4490 Castlegate Drive College Station, Texas 77845 Phone: (979) 690-7250 GENERAL DESCRIPTION AND LOCATION Location: Castle Rock Subdivision, Phase 4, is located on the north side of SH 40, William D. Fitch Parkway, near its intersection with Castle Rock Parkway. Description: •Area: • Proposed Land Use: • #of Lots: • Existing Land Use : • Land Description: Adjoining Land Use: Primary Drainage Facility: Flood Hazard Information: FEMAFIRM: Floodplain: 5.601 acres PDD-Single Family Residential 26 lots Agricultural -consisting primarily of a wooded pasture used for cattle grazing Rolling terrain that falls north toward Spring Creek. The site is heavily wooded. The site is bounded on the south and west by developed sections of the Castle Rock Subdivision, on the north by Castle Rock Park and a greenbelt and on the east by future sections of Castle Rock. Spring Creek # 48041C0205 D (February 9, 2000) No portion of this Phase lies within the floodplain of Spring Creek or its tributaries. HYDROLOGIC CHARACTERISTICS The existing site is predominately wooded. The elevations range from 275 to 285, sloping generally in a northeasterly direction where the runoff enters tributaries of Spring Creek, which ultimately flow into Spring Creek on the adjacent tracts. GENERALSTORMWATERPLAN The drainage plan for this development will involve the installation of inlets, junction boxes and storm sewer pipes for 2 separate systems which both will discharge into an existing ditch which is located in the future Phase 6 area of Castle Rock. This ditch is a tributary of Spring Creek. One of the systems connects to an existing storm sewer pipe which was constructed with Phase 2B which collects the runoff from existing storm sewer systems constructed with Phases lA, 2A, 2B and 3. The detention pond for this proposed development is located downstream of this development, on Spring Creek, adjacent to SH 6, on the Crowley Tract, which is being developed as the Tower Pointe development. Page 1 of3 COORDINATION & STORMWATERPERMITTING 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. DRAINAGE DESIGN General Information: Street Design: Tc Methodology: Tc Minimum Design Storm Event: Pipe Materials: Manning's n Value: Runoff Coefficients: Design Constraints: Design Software: Stormwater runoff from Phase 4 of the subdivision will be collected by 2 separate systems which discharge into an existing ditch. One system primarily carries the runoff from previous Phases and the other collects runoff from Phase 4 and the Castle Rock Park area adjacent to the site. The location of the drainage areas for evaluation of the gutter depth check, inlet sizing and pipe evaluation are shown on Exhibit A. Also shown are the location of the inlets, junction boxes and storm sewer pipes. In order to not have to construct open channels for the storm sewer pipes in Phase 4 to drain into and then fill these channels with the future development of Phases 5 and 6, storm sewer inlets, junction boxes and pipes are proposed with this Phase even though they are located in Phase 5 and Phase 6. Standard cross-section (3% ~ross-slope, 27' B-B residential) Lay down curb & gutter on residential streets Asphalt pavement Standard recessed curb inlets (5 ' length) TR55 10 minutes 10-year -residential street & storm sewer Corrugated HDPE w/smooth interior, RCP, Profile Gasket in accordance with ASTM C443, ASTM C78, Class III 0.013 0.60 for developed lots Max. water depth in curb = 4.0 in. or 0.33 ft. Min. flow velocity= 2.5 fps Max. flow velocity = 15 fps 100-yr storm runoff maintained within the ROW (4 inches above curb) Excel spreadsheets, DODSON HydraCalc Hydraulics This software was used to compute pipe capacity, flowrate and velocity through each pipe, and determine hydraulic grade line elevations at each inlet or junction box. All of this information is shown in the summary tables in Appendix E. The College Station requirement for a 25% reduction in cross-sectional area of pipes less than 27" diameter is achieved by using internal pipe diameters that are less than the standard diameter. The 24" diameter pipe areas were reduced by 25% and a 20.6" diameter pipe used in the analysis and the 18 ' diameter pipe areas were reduced by 25% and a 15.6" diameter pipe was in the analysis. Page 2 of3 Design Results Applicable Exhibits: DETENTION DESIGN General: CONCLUSION CERTIFICATION The data presented in the Appendices indicates the gutter depth, inlet sizing and pipe sizes are in accordance with the requirements of the design guidelines. Exhibit A -Drainage Area Map Appendix A -Technical Design Summary Appendix B -Drainage Area Calculations Appendix C-Depth of Flow in Gutter Summary Appendix D -Inlet Design Summary Appendix E -Pipe Design Summary Stormwater runoff from Phase 4 and all previous and subsequent phases of the Castle Rock Subdivision flow into Spring Creek upstream of the regional detention facility constructed in 200 l. This facility was designed to control stormwater releases from the Castle Rock Subdivision and other adjoining properties. No additional detention facilities are provided with the development of this project. Based on the concurrence with the previous design calculations from Phases lA, 2A, 2B and 3, the drainage system in Phase 4 of the Castlerock Subdivision will function within the requirements and restrictions of the College Station Drainage Policy and Design Standards. I, Joseph P. Schultz, Licensed Professional Engineer No. 65889, State of Texas, certify that this report for the drainage design for Castle Rock Subdivision, Phase 4, was prepared by me in accordance with the provisions of the Unified Stormwater Design Guidelines. Page 3 of3 APPENDIX A Technical Design Summary 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: \-\ crrk (°"S:.,..t'u-:,.. ~ G.~wv-, p_~.sc ~ J\'179 Tcryan College Station Q_e \le<;c 5Jc;+Jo A / ~ f-CJ 77 845" DatNf sube1: d-.f(-.· U c 0; Lead Engineer's Name and Contact lnfo.(phone, e-mail, fax): Other: j oS•'f'~ p. 5 cJ.-..,.H L JP.£. ft> q'J -7 tlj { . {//Zo f\,;'U.f h i-ft:>°i1~1 r ~J 1cefch. .... /h.~ev Supporting Eng ineering I Consulting Firm(s): -.I Other contacts: -- ~ .. Developer I Owner t Applicant Information r ' ,.-~ ~ Developer I A~licant Name and Address: Phone and e-mail: b rt..c""s r a. :r ~ e. "h""'.1-h rs 1 LL-l. {;,C)D .-7250 4110 e" j·+t t G~ D, :.{ , c. s. 1l 11 &qr "'"11~" ·f l ~1l;rre. (J<./:-Z.11"'\•l'\d· Property Owner(s) if not Developer I Applicant (&address): Phone and e-mail: -<)" CJ "'t a~ (}e.~rv Project Identification ' "·:~i.::. Development Name: C-c5-H<-(lck 5 .... ~d ;11;f,~ ... , /) leJ(. f Is subject property a site project, a single-phase subdivision, or part' of a multi-phase subdivision? ~ .... \-\--;-p'h.fsc. If multi-phase, subject property is phase 5 of fq . I Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B-3a) rl l:, (J .t-f+.w~'""" ')°u r "/; t1--)f -S .l~\ ~ ;owt-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. Ph D}( s ( A I I r'3 ) / l. I 2 I), Z. C. -t-3 e-r ~ ~7'~· General Location of Project Area, or subject property (phase): w :l\~~VV\ o. F: ~c l PNA wci I'\ Ci ('./-\-. tl Cpr+lt'. 5"'+e SU J,J.'..;rf, ~ "\ J In City Limits? Bryan: --acres. College Station: c;_ (:," \ acres. STORMWATER DESIGN GUIDELINES Effective February 2007 Extraterritorial Jurisdiction (acreage): -Bryan: -· College Station: -Acreage Outside ET J: Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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: 0. FA c i,... P.vh:w.'-1 developments: w ~\l:,-. P"-{) t c.5 7-A / z e 1 r A ca rt-le. fl ck Porhw~ Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): N ~('.q_ l.N;~~. fL. I ~ ~0-Jt 5 )O<,..·A'\ Cre e-fr. Plat Information For Project or Subject Property {or Phase) ·' Preliminary Plat File #: f 4 St> coof.:. Final Plat File #: -Date: - Name: Co 5+/ ~ {4,'-jc ~ .. loJ.'vlf~ Status and Vol/Pg: )~b"":f-kJ 11-4 -o<j If two plats, second name: File#: Status: Date: Zoning -Information For Project or Subject Property (or Phase) ;: l' Zoning Type: p() 0 ~r Proposed? Case Code: Case Date Status: Zoning Type: Existing or Proposed? Case Code: Case Date Status: ·' Stormwater Management Planning For Project or Subject' Property (or Phase) Planning Conference(s) & Date(s): Participants: rJ/ A - Preliminary Report Required? J::!..LA.. Submittal Date Review Date Review Comments Addressed? Yes N//),.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. NIA STORMWATER DESIGN GUIDELINES Effective February 2007 Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised Februarv 2009 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 Deot. Contact: Date: Subject: With Other Departments of rJ/ r+ Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non-jurisdiction City Needed? t/ Yes No -- Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? __J(' Yes --No Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? Yes No v ---- Coordination with Summarize need(s) & actions taken (include contacts & dates): T AMUS Neededv- Yes __ No __ 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 x fJr~prn~J No --Yes US Environmental Protection Agency No /Yes - Texas Commission on G,c,__LI'.. ( Environmental Qu~ R~/,,,...= ~ No __ Yes __ / cco Brazos River Authority No ,,/Yes - STORMWATER DESIGN GUIDELINES Effective February 2007 Status of Actions (include dates) -N~ ~ 4-c+r·~.-- Prei \ e c.:k Co w-p{; r J ()J( (Jt_/",....: + ., /J (J 1-.-J.c Page 5 of 26 ·he fdeJ ~ ~.nJor- APPENDIX. D: TECH. DESIGN SUMMARY As Revised Februarv 2009 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? (lt,1\.€:' --II u. t>.... I- Site __ Redevelopment of one platted lot, or two or more adjoining platted lots. Development __ Building on a single platted lot of undeveloped land. Project __ Bu ilding 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). t-Jf A-__ 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 ROW. I Size of '2.G L .. -\-s 5Jre e.f s 874 ProE!osed I Project Is any work planned on land that is not platted If yes , explain: or on~ for which platting is not pending? __ No __ Yes ~/t'L .. .. -FEMA Floodplains -"' ~ Is any part of subject property abutting a Named Regulatory Watercourse I No V Yes (Section II, Paragraph B1) or a tributary thereof? -- Is any part of subject property in floodplain !No£ Yes Rate Map 4Ab4fl L()Z.o'SO area of a FEMA-regulated watercourse? -- Encroachment(s) Encroachment purpose(s): __ Building site(s) __ Road crossing(s) into Floodplain areas planned? No V __ Utility crossing(s) __ Other (explain): ,v/ Pt 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. rJ I Pr STORMWATER DESIGN GUIDELINES Effective February 2007 Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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? Reference the study (&date) here, and attach copy if not already in City files. y(/ Lo VY\ fl - Is the stormwater managem~nt plan for the property in substantial conformance with the earlier study? Yes V 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. !'I) A 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? V No Identify: __ Yes __ Yes Based on location of study property in a watershed, is Type 1 Detention (flood control) ?feded? (see Table B-1 in Appendix B) /tlrw0 f r,v,'d;...) __ Detention is required. __ Need must be evaluated. __i Detention not required. What decision has been reached? By whom? - If the need for Type 1 Detention must be evaluated: How was determination made? --- STORMWATER DESIGN GUIDELINES Effective February 2007 Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -ProQerrt Characteristics I Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Ptyise) (continued) Does subject property straddle a Watershed or Basin divide? V No --Yes If yes, describe splits below. In Part 4 describe desiQn concept for handling this. Watershed or Basin Larger acreage Lesser acreage Above-Project Areas(Section 11, 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 s~ction(s), small creek (non-r~ulatory), regulatory Watercour~r tributary); r-f-: S+·"'-~ J~r°"" ~llvV f f~Y'\ Co )IQ J-r l IAY\-.. Flow determination: Outline hydrologic methods and assumptions: tZc~".,..._.,\ f°'(_,v o-+.l.,.;_ vSt.J /, pr(11/·0 .... f {JJ-..aJ <'f fo ch>rv-~i' ~ rv-.v-. "f P. Dov:orm runoff drain from public easements or ROW onto or across subject property? __ No __ Yes If yes, describe facilities in easement or ROW: Are changes in runoff characteristics subject to change in future? Explain No Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property drain across low~operties before reaching a Regulatory Watercourse or tributary? No Yes Describe length and characteristics of each conveyance pathway(s). Include ownership of property(ies). p"' thw't Vr~ eoi-: r +-l--:i VY\(. I" (I/'. Jv-":"' "J .f. J J -h,~r er ~~ (,vJ o~~f ~ c ~~ ()~ STORMWATER DESIGN GUIDELINES Effective February 2007 -()wn"'-./5h;p .J-6& )'c.c.J f.ra .J-.'J G, Uc)"~ Page 8 of 26 ) fv.1-fo"' , APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Proeertv 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 ~ :1'1 0 V\l If\. ) p1opv i-J ' Areas C !)[ : ~ -\-:.~. J cl ~ +c~ 5 , (A be ~5<1l ~ (irf\..A,/ ~ (µ, r,"" (, ~P= v+-w i~ I et:.vc. J ~ )~r""' re Vu -v l/ s~""' V.-1\. \-: \ ;~ rt:~c~ ~ 5pt'>~ C'.rc.Jc.· Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). G1-I J f-/'1 S rh.. r""" Sv~ S7JrftW1 r Pre..,,,---.. J (J h -.; ~ > ( ...._ Nearby Drainage Do any of these have hydrolog ic or hydraulic influence on proposed stormwater Facilities design? ~o ---1L:::. Yes If yes, explain: FU :5f :; )'Ji,,,_ f e Vv-V (-pl; liV ,' [J1 &( e pl fe,.. cJJ.J,. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Start (Page 4.1) Stormwater Management Concept .i -F 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. rte~ t:-r~~ u .~( o-J Crt Ci' : r c.~+w<!. ~ ki1 c..A.. f"{._: ! t-r""" ~ lN ~.'c. l. \),) : \I C)('.. H" clJ.P w .' ~ ~-f 6-hr~ ~(W<..f' l)S'feM ph..e fe Discharge(s) To Lower Property(ies) (Section II, Paragraph E1) Does project i ~e drainage features (existing or future) proposed to become public 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 provide status of actions on each. (Attached Exhibit# ) ~ c;.i, '9wA r f'~r41 G o;c Vfltt-+ J V\.,+ V\c.e~J ~ Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit# ) Combination: If combination is proposed, explain how discharge will differ from pre- development conditions at the property line for each area (or point) of release. If Scenario 2, or Combination are to be used, has proposed design been coordinated with owner(s) of receiving property(ies)? documentation. STORMWATER DESIGN GUIDELINES Effective February 2007 No Page 10 of 26 --Yes Explain and provide APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi-Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result in shifting runoff between Basins or between What design and mitigation is used to compensate for increased runoff Wa~ds? from gaining basin or watershed? __ No 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 conditions? 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# ) CJ ow J ~, 1 fl. J-duw>11J+-rec ~• O-e.te-¥'\-2 ...... P\:),.,_J :~ (~l~J Col\ ot ~~ t f ( c 5 c J-v: J j '"te -fr ~f~ f-l :J kw/ G, M 2. For Overall Project Area (type & location of facilities): (Attached Exhibit# ) [re v.A~/ -f n,.J-(_lawu PD ; ,,_{e) J ~4-t~+P11_.. {Jo-r-..J · 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)? C'· "U <ll "' c <ll Are other Best ~agement Practices for reducing stormwater pollutants proposed? 1ii >-a: __ No __ Yes Summarize type of BMP and extent of use: "' 6.'lf r;M..cc 1 ~r-lrr.-eJ;~ E,,z_.·+ J "'-'1Jvo,,..u.lc~: ... t 1 fe ed .'....._;. c Cl 'iii i~ If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain in later questions. <ll --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 February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept 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)? JL. 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): -r~ r~-..."~Pf<o~'WI t-4 Cerf/I! ~e-h. d~udopt'\.t~+ /j Co .li e ~~ ~ 5.f,/~ 5ew(./ '5/f~..,..f a ... J d_:sc.h-v-5~J , ... -\a .f-r.in.•!trrrf 02 5 pr ;" 5 c._r -e " k O. r cl +'1.-.e"' ·' + {l ""' < J-o t--k d..e ft"" i: 1• ~ IC C. , '7'/ • I Within Or Serving Subject Property (Phase, or Site) If property part of larger Project )(tea, is design in substantial conformance with earlier analysis and report for larger area? _V_ Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. "' ..c <L> ~~I :;:: .... "' <L> ..... ~ <L> :::i 0 ~~z, <L> c: .._ ro <( Typical shape? I Surfaces? Steepest side slopes: Usual front slopes: Usual back slopes: Flow line slopes: least ___ _ Typical distance from travelway: typical greatest ___ _ (Attached Exhibit# ) Are longitudinal culvert ends in compliance with 8-CS Standard Specifications? ___ Yes No, then explain: At inte~ctions or otherwise, do valley gutters cross arterial or collector streets? __ \/_ NNo __ Yes lfyesexplain: Are~ey gutters proposed to cross any street away from an intersection? __ No __ Yes Explain: (number of locations?) STORMWATER DESIGN GUIDELINES Effective February 2007 Page 12 of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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'-· "'C Q) Ill ::::J .... Q) :i:: ::::J Cl "'C -c: "'C Ill Q) ..c ~ .... ·-::::J ..... u a .c u ..... _ ·~ Ill Q) ~ iii ~ <{ C'-· "'C ~ Ill c: ·~~ 0 C of (). l'J &h Gutter line slopes: Least , e::> r.:; Usual n I' Greatest Are inlets recessed on arterial and collector streets? __ Yes __ No If "no", identify where and why. "11 A- Will inlets capture 10-year des~tormflow to prevent flooding of intersections (arterial with arterial or collector)? Yes __ No If no, explain where and why not. Will inlet size and placement prevent exceeding allowable water spread for 10-year design storm throughout site (or phase)? _.LLYes __ No If no, explain. ~ ( e f1.-()~ ... d; )l c_ Sag curves: Are inlets placed at low points? \./ Yes __ No Are inlets and conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? _J..Lyes __ No Explain "no" answers . Will 100-yr stormflow be contaile?v combination of ROW and buried conduit on whole length of all streets? Yes __ No If no, describe where and why. Do d~s for curb , gutter, and inlets comply with B-CS Technical Specifications? \, Yes __ No If not, describe difference(s) and attach justification. / Are any 12-inch laterals used? ~ No used. __ Yes Identify length(s) and where Pipe runs between system I Typical lo"\ Longest 2.A-C"f> \ access points (feet): ~-....-.... .. .___ -~- Are junction boxes used at each bend? ___i.L' Yes and why. __ No If not, explain where "'0 ..... § I 1------------------~---------~ Ill Are downstream soffits at or below upstream soffits? Least amount that hydraulic !!!. Yes \.,/ No __ If not, explain where and why: grade line is below gutter line (system-wide): STORMWATER DESIGN GUIDELINES Effective February 2007 Page 13 of 26 Z ·' . ·' APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.5) Stormwater Management Concept (continued) ' .•· Within Or Serving Subject Property (Phase, or Site) (continued) (i) Describe watercourse(s), or system(s) receiving system discharge(s) below Q) (include design discharge velocity, and angle between converging flow lines). (.) c: 1) Watercourse (or system), velocity, and angle? ro ..... 9 o: cr.1>~ If) G;e: JT; ""~ O!h\t---p / f ~ Io 6 J..:~~°"S(. c: ~ Q) .... .--.a al E 2) Watercourse (or system), velocity, and angle? ::i .... c: 0 P:p~ ~t c.. J:>ch~~ 0 4.a.. tfJ ·--~1-: st-2..._\ fJ :--~ ~ ..... 0 I c: . ~ 0 .E ~.~ E °' ~ °' E 3) Watercourse (or system), velocity, and angle? ..... ro ~ If) If) ~ Q) ::i c: 32 0 ·-> ~ e 'O Cl. E ...... For each outfall above, what measures are taken to prevent erosion or scour of .... Q) 0 Q) receiving and all facilities at juncture? ...... ..c: (/) If) 1) {G.dt. f2-'.ft""f };'f\:.-5 fv ~iL•~+: ... 5 Q:,J-..\-Q) -ro .... 2) {2-et tr.. P-:ercf l«"'.'--s hr &ir+1~ (J :h !,,, ro Cl. Q) If) c: 3) ~ Are swale(s) situated along property lines between properties? __ No --Yes Number of instances: For each instance answer the following questions. Surface treatments (including low-flow flumes if any): C"· If) Q) ~If) ...... Q) Flow line slopes (minimum and maximum): If)>-c: ~ I ~I Outfall characteristics for each (velocity, convergent angle, & end treatment). If) Q) .... Will 100-year design storm runoff be contained within easement(s) or platted drainage <( ROW in all instances? --Yes --No If "no" explain: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.6) Stormwater Management Concept (continued) ... ,# .. Within Or Serving Subject Property (Phase.pr 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 .r::. .B Are top of banks separated from road shoulders 2 feet or more? __ Yes --No cs Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No Q) ----"'O For ariy "no" answers provide location(s) and explain: "iii "'O 113 0 0::: If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: (/) Q) Is 100-year design flow contained in conduit/swale combination? Yes No >-----II If "no" explain: ""' c Space for 1 00-year storm flow? ROW Easement Width 0 113 z iii ~I~ Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: :8 C'-· '6 (/) "'O Qi 113 Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c >-c 113 c .r::. 113 u .... c .E Q) c Access Describe how maintenance access is provided (to swale, into conduit): a. 0 0 ~ ..... 113 0 E ::i ~ .E .!::: c Instance 2 Describe general location, approximate length: Q) "'O E Q) 113 (/) (/) ::i (/) Q) Is 100-year design flow contained in conduit/swale combination? Yes No c "'O 0 ·5 ---- ~ 0 If "no" explain: .... c a. :.0 ..... Q) Space for 100-year storm flow? ROW Easement Width E Q) 0 .r::. u (/) Swale "Surface type, minimum Conduit Type and size, minimum and maximum ..... Q) ::i iii and maximum slopes: slopes, design storm: "'O .... c 113 0 a. u Q) Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): --(/) Q) iii c ~ ~ (/) Q) Access Describe how maintenance access is provided (to swale, into conduit): .... <{ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4. 7) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surfacing: c: "iii E 0.. x 0 UJ ..... ...... ti= ui Is 1 OD-year design flow contained in swale? --Yes --No Is swale wholly 0 Q) c: ,_I within drainage ROW? Yes No Explain "no" answers: ::i ----..... Q) > "iii Access Describe how maintenance access is provide: (.) ~ z ~ I Instance 2 Describe general location, approximate length, surfacing: Q) ·;:: C'· ::i rn ..0 c :i Q) 0 E £ Q) rn Is 100-year design flow contained in swale? Yes No Is swale wholly -~ ro ----rn Q) with in drainage ROW? __ Yes No Explain "no" answers: Q) ..... --0 "iii ~ 3: rn 0 ~ a:: -~ Access Describe how maintenance access is provided: :0 ::i c. Instance 3, 4, etc. If swales are used in more than two instances, attach sheet providing all above information for each instance. "New" channels: Will any area(s) of concentrated flow be channelized (deepened, widened , or straightened) or otherwise altered? No Yes If only slightly -- -- <'· shaped, see "Swales" in th is Part. If creating side banks, provide information below. -c c: Will design replicate natural channel? Yes No If "no", for each instance Q) -----rn ro describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year 0 -c. c. 0 x design flow, and amount of freeboard: ..... UJ c. Instance 1: rn rn c Q) Q) >- E I Q) > Instance 2: e c. ~I Instance 3: () STORMWATER DESIGN GUIDELINES Effective February 2007 Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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) I Existing channels {small creeks}: Are these used? \/ No --Yes If "ves" provide the information below. Will small creeks and their floodplains remain undisturbed? __ Yes --No How many disturbance instances? Identify each planned location: For each location, describe length and general type of proposed improvement (including floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year design flow. ~ Q) ::I c: ~ Watercourses {and tributaries}: Aside tjm fringe changes, are Regulatory 0 Watercourses proposed to be altered? __ No __ Yes Explain below. ~ rn 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 provi.,,full documentation of analysis procedures > 0 ..... and data. Is full report submitted? Yes __ No If "no" explain: a. E ,_J ~ di c: c: nJ All Proposed Channel Work: For all proposed channel work, provide information ..r:::. 0 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. t1l A' Will 100-year flow be contained with one foot of freeboard? --Yes --No If not, identify location and explain: r\~ Are ROW I easements sized to contain channel and required maintenance space? --Yes --No If not, identify location(s) and explain: rJ If\ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.9) Stormwater Management Concept (continued) "' I 7'. ' Within Or Serving Subject Property (Phase, or Site) (continued) e:_"-1t>--·-s 'J;·,H. -p-~J {) """ ~ '""" 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: en Q) >- I For each facility what is 25-yr design Q, and design of outlet structure? Facility 1: 0 z Facility 2: JI Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: __ Yes No Facility 2: Yes No ------C'· If "no" explain: "O Q) en 0 c.. 0 ..... a.. For each, what is velocity of 25-yr design discharge at outlet? & at spillway? en Q) Facility 1: & Facility 2: & ~ 'i3 Are energy dissipation measures used? No Yes Describe type and ro ----Li.. location: c: .Q 'E Q) -Q) 0 Q) For each, is spillway surface treatment other than concrete? Yes or no, and describe: ..... <( Facility 1: Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Facility 2: If berms are used give heights, slopes and surface treatments of sides. Facility 1: Facility 2: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.10) ,, Stormwater Management Concept (continued) ,, Within Or Serving Subject Property (Phase, or Site) (continued) UJ ~ ~u u Q) ro ::J LL c c:.;:: 0 c '.+:; 0 c u Q) -Q) 0 C'· UJ Ol .!: UJ UJ e u UJ Do structures comply with 8-CS Specifications? Yes or no, and explain if "no": Facility 1; Facility 2: For additional facilities provide all same information on a separate sheet. Are parking areas to be used for detention? __ No __ Yes What is maximum depth due to required design storm? RoaHside Ditches: Will culverts serve access driveways at roadside ditches? __:i__ 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 8-CS Technical Specifications? __ Yes Explain any "no" answers: __ No Are culverts parallel to public roadway alignment? __ Yes __ No Explain: Q) ~ ~a. I t-----------------------------------1 Creeks at Private Drives: Do private driveways, drives, or streets cross drainage ways that serve Above-Project areas or are in public easements/ ROW? :; ~--No __ Yes If "yes" provide information below. -c:~UJ 01 '------------------4 How many instances? ___ Describe location and provide information below. ~ Location 1 : ::J u ~ <( Location 2: Location 3: For each location enter value for: Design year passing without toping travelway? Water depth on travelway at 25-year flow? Water depth on travelway at 100-year flow? 1 2 3 For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 19 of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.11 ) Stormwater Management Concept (continued) ., Within Or Serving Subject Property (Phase, or Site) (continued) Named RegulatoD£ Watercourses {&Tributaries}: Are cu lverts 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 each identify the ..c: en ---- Q) location and provide the information below. en iii Instance 1: Q) .... >-~ I~ Instance 2: Instance 3: c: 0 Jl Yes or No for the 100-year design flow: 1 2 3 Headwater WSE 1 foot below lowest curb top? I~ Spread of headwater within ROW or easement? E <'-· ro Is velocity limited per conditions (Table C-11 )? en en g'-c Explain any "no" answer(s): ·-c: :Z ro 0 c: .... 0 0:;; >-ro ro u ~ .2 -c Q) ro .o Minor Collector or Local Streets: Will culverts serve these types of streets? 0 --........ (.) (.) No Yes How many instances? for each identify the ·-en -Q) ----.g -c location and provide the information below: a. Q) -a. Instance 1: ro ;:;. -c >-Instance 2: Q) c: en ro :::J ..... Instance 3: en o t en Q) Q) ~ (.) For each instance enter va lue, or "yes" /"no" for: 1 2 3 :::J c: u ro Design yr. headwater WSE 1 ft. below curb top? -Q) en .... c: <( ·-100-yr. max. depth at street crown 2 feet or less? Q) .... 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 February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.12) Stormwater Management Concept (continued) l "'·· Within Or Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside ditch intersects) provide information requested in next eight boxes. Do culverts and travelways intersect at 90 degrees? --Yes --No If not, identify location(s) and intersect angle(s), and justify the design(s): Does drainage way alignment change within or near limits of culvert and surfaced approaches thereto? __ No --Yes If "yes" identify location(s), describe change(s), and justification: Are flumes or conduit to discharge into culvert barrel(s)? __ No __ Yes If yes, identify location(s) and provide justification: 'O Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? Q) --No --Yes If "yes" identify location(s), describe outfall design treatment(s): ::i c: :;; c: 0 .2. I/) t Q) Is scour/erosion protection provided to ensure long term stability of culvert structural ~ ::i components, and surfacing at culvert ends? __ Yes __ No If "no" Identify (.) locations and provide justification(s): Will 100-yr flow and spread of backwater be fully contained in street ROW, and/or drainage easements/ ROW? __ Yes --No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstream to neighboring land(s) not encompassed in subject property? --No --Yes If "yes" describe location(s) and mitigation measur~s: 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 21of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters j 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? v 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? (j) Q) Cl "C ·;:: en A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? --Yes --No If "no" explain: Is a Stormwater Provide a general description of planned techniques: .~ Pollution Prevention 5; ff {e11.ce. u~5+1vJ-lM et.Uf 5 I : ..., l..l-"iii Plan (SW3P) ::::J p<t1~v\-z~·-< e5+,!,l:1h~ (if ;1fi•'1 0 established for ~ project consjtion? Cl> -~ __ No __ Yes Special Designs -Non-Traditional Methods Ar~ non-traditional methods (aquatic echosystems, wetland-type detention, natural stream reP.li tion, 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? STORMWATER DESIGN GUIDELINES Effective February 2007 Yes -- -- Page 22 of 26 No If "no" explain: APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceQt and Design Parameters J Continued (Page 4.14) ·stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) 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 Specifications, check type facility(ies) and explain by specific detail element. --Detention elements __ Drain system elements --Channel features Culvert features Swales Ditches Inlets Outfalls ---- ------ __ Valley gutters __ Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviation(s). Specific Detail Element Justification for Deviation (attach additional sheets if needed) 1) 2) 3) 4) 5) Have elements been coordinated with the City Engineer or her/his designee? For each item above provide "yes" or "no", action date, and staff name: 1) 2) 3) 4) 5) •. ... .. r ~-. . '; , Design Parameters ,'., !• ·.~ . Hydrology / Is a map(s) showing all Design Drainage Areas provided? .k""' Yes --No Briefly summarize the range of applicatiot';ade of the Rational Formula: (lvlf\\)·F:P c:hlrv~\'\J.;~ 5 t.x\-v ~~ C~c"} )~ }ef J °'-1"'~ ~hr~'Y' 5c.w-u-p: re dJL5':)'•" . What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 2.. 'D 1 acres ....... l,t'....1f V\-n..o. - STORMWATER DESIGN GUIDELINES Effective February 2007 Location (or identifier): 0 ~~ti\ -b;. /, : h .-+ A- (J: <! 4o CD ·· Page 23 of 26 Z.o.76 '4-<r<t s APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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 dete~nations for time of concentration, was segment analysis used? No Yes In approximately what percent of Design Drainage Areas? ~J % As to intensity-duration-frequency and rain depth criteria for det~~ing runoff flows, were any criteria other than those provided in these Guidelines used? No __ Yes If "yes" identify type of data, source(s), and where applied: For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked), and that used as the basis for design . Feature Analysis Year(s) Design Year Storm drain system for arterial and collector streets I\) J Pr NI!+- Storm drain system for local streets I 0 4 I a 0 ( 0 Open channels /VJ It-N}14 Swale/buried conduit combination in lieu of channel I r ' ( Swales ,, ,. Roadside ditches and culverts serving them I/ ll Detention facilities: spillway crest and its outfall I I ' ( Detention facilities: outlet and conveyance structure(s) I r " Detention facilities: volume when outlet plugged I I ,, Culverts serving private drives or streets I, ,, Culverts serving public roadways ,, ,. Bridges: provide in bridge report. I I II Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Highest (feet per second) Lowest (feet per second) Streets and Storm Drain Systems Roughness coefficients used: For conduit type(s) 1-\ Vl PE: STORMWATER DESIGN GUIDELINES Effective February 2007 Gutters Conduit Culverts Swales Channels -q.0 -----3. (, --- Provide the summary information outlined below: For street gutters: {(_c, f> Page 24 of 26 o.o[~ Coefficients: 0 . DI ~ Q.0\) .((l)~o\L APPENDIX. D: TECH. DESIGN SUMMARY As Revised Februarv 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters I Continued (Page 4.16) Design Parameters {continued) ~ Hydraulics (continued) Street and Storm Drain Systems (continued) For the following, ar~~ptions other than allowable per Guidelines? Inlet coefficients? No __ Yes Head and friction losses __ No --Yes Explain any "yes" answer: / In conduit is velocity generally increased in the downstream direction? V Yes --No Are elevation drops provided at inlets, manholes, and junction boxes? Vves --No Explain any "no" answers: / Are hydraulic grade lines ca lculzd shown for design storm? V 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: s ~ {f; J-oF ol.:5ch tvj ,'._.) f ·/~ l ~:\v.sJrv-~ N[ tepen Channels If a HEC analysis is utilized, does it follow Sec Vl.F.5.a? __ Yes __ No Outside of straight sections, is flow regime within limits of sub-critical flow? __ Yes __ No If "no" list locations and explain: r-J I tr 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? f'J( A Entrance, friction and exit losses: ('Jr Pr Bridges Provide all in bridge report tJ I fl- STORMWATER DESIGN GUIDELINES Effective February 2007 Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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 Conclusions Add any concluding information here: O.e s:v C .,,~l· J w : !+-. /rev ,; d ckr:5"' J urJ f3c S Oe5 rjv-G.~{kL'~ l Attestation . Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Desi n Summa Draina e Re ort b si nin and sealin below. State of Texas PE No .. _0_S"_B_S_'1 __ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised Februarv 2009 APPENDIXB Drainage Area Calculations Castle Rock Subdivision -Phase 4 Drainage Area Summary Area# Area, A (acres) 401 2.870 402 1.180 403 0.430 404 0.190 405 0.210 406 0.220 407 0.190 408 0.630 409 0.690 411A 0.140 4118 0.050 412 0.210 413 0.630 414A 0.450 4148 0.400 415 2.560 The Rational Method: Q=CIA Q = Flow (cfs) A = Area (acres) C = Runoff Coeff. I = Rainfall Intensity (in/hr) Brazos County: c tc 10 year stonn 110 010 (min) (in/hr) (cfs) 0.40 32.8 4.679 5.37 0.46 32.0 4.749 2.58 0.60 10.0 8.635 2.23 0.60 10.0 8.635 0.98 0.60 10.0 8.635 1.09 0.60 10.0 8.635 1.14 0.60 10.0 8.635 0.98 0.60 15.2 7.148 2.70 0.60 15.6 7.057 2.92 0.60 10.0 8.635 0.73 0.60 10.0 8.635 0.26 0.60 10.0 8.635 1.09 0.60 20.6 6.111 2.31 0.60 20.1 6.193 1.67 0.60 10.0 8.635 2.07 0.60 20.0 6.209 9.54 I = b I (tc+d)e tc = Time of concentration (min) 10 year storm b = 80 d = 8.5 e = 0.763 100 year storm b = 96 d = 8.0 . e = 0.730 100 year stonn 1100 (in/hr) 6.405 6.498 11.639 11 .639 11 .639 11 .639 11 .639 9.671 9.551 11 .639 11 .639 11 .639 8.301 8.408 11 .639 8.430 0100 (cfs) 7.35 3.53 3.00 1.33 1.47 1.54 1.33 3.66 3.95 0.98 0.35 1.47 3.14 2.27 2.79 12.95 le= U(V*60) L = Length (ft V = Velocity (ft/sec) APPENDIXC Depth of Flow in Gutter Calculations Castle Rock Subdivision Phase 4 Depth of Flow in Gutter (Refer to Exhibit A for Gutter Locations) Gutter A Location Area# (acres) 2A 402 1.180 2B 40S 0.6S4 3A 403 0.109 3B 404 0.632 4A 407 0.190 4B 409 0.690 SA 406 0.220 SB 408 0.630 SA 413 0.630 7A 414A 0.4SO 7B 414B 0.400 BA 411A 0.140 BB 411B O.OSO Laydown Curb -10-yr storm max design depth -4" Transverse (Crown) slope (ft/ftl 27' street = 0.0330 c Slope tc (ft/ft) (min) 0.46 0.0080 32.0 0.60 O.OOBO 10.0 0.60 O.OOBO 10.0 0.60 O.OOBO 10.0 0.60 0.0080 10.0 0.60 O.OOBO 10.0 0.60 0.0080 10.0 0.60 0.0080 10.0 0.60 0.0100 20.6 0.60 0.0100 20.1 0.60 0.0080 10.0 0.60 0.0010 10.0 0.60 0.0080 10.0 Straight Crown Flow (Solved to find actual depth of flow In gutter, yl: Q = 0.56 * (z/n) * S112 * y113 ~ y ={QI [0.56 * (z/n) * S112]}311 n =Roughness Coefficient= 0.018 S = StreeVGutter Slope (ft/ft) y = Depth of flow at inlet (ft) z = Reciprocal of crown slope: 27' street = 30 1,. (In/hr) 4.749 8.63S 8.63S 8.635 B.63S B.635 B.63S B.63S 6.111 6.193 8.63S B.635 8.63S 10-year stonn 100-year stonn Q,. Y10-actua1 1, .. Q, .. Y100 (cfs) (ft) (In) (In/hr) (cfs) (ft) (In) 2.S8 0.270 3.24 6.498 3.S3 0.304 3.6S 3.39 0.300 3.S9 11 .639 4.S7 0.33S 4.02 O.S6 0.153 1.84 11.639 0.76 0.171 2.0S 3.27 0.296 3.SS 11.639 4.41 0.331 3.97 0.9B 0.1BB 2.26 11.639 1.33 0.211 2.S3 3.S7 0.306 3.67 11.639 4.B2 0.342 4.10 1.14 0.199 2.39 11.639 1.S4 0.223 2.67 3.26 0.29S 3.S4 11.639 4.40 0.330 3.96 2.31 0.249 2.99 8.301 3.14 0.279 3.3S 1.67 0.220 2.65 8.40B 2.27 0.247 2.97 2.07 0.249 2.99 11.639 2.79 0.279 3.34 0.73 0.24B 2.98 11.639 0.98 0.278 3.33 0.26 0.114 1.37 11.639 0.3S 0.128 1.S3 APPENDIXD Storm Sewer Inlet Design Summary Castle Rock Subdivision -Phase 4 Storm Sewer Inlets on Grade -Design Analysis Inlet Length Street 010 L 10, ft. Bypass 010 L 100, ft. Bypass No. ft. Slope,% cf s Design cfs cfs Design cfs 6 5 1.00% 2.31 11 .14 0.83 3.14 12.67 1.29 Castle Rock Subdivision -Phase 4 Storm Sewer Inlets in Sump -Design Analysis Inlet Length 010 D10 D10 0100 D100 D100 No. ft. cfs ft. in. cfs ft. in. 2 5 3.67 0.420 5.04 5.00 0.516 6.19 3 5 3.21 0.384 4.61 4.33 0.469 5.62 4 5 3.90 0.437 5.24 5.28 0.535 6.42 5 5 3.84 0.433 5.19 5.2 0.529 6.35 7* 5 4.57 0.486 5.83 6.35 0.605 7.26 8 5 0.98 0.174 2.09 1.33 0.213 2.56 * Includes bypass flow from upstream inlets on grade Assume 10% clogging for design Castle Rock Subdivision -Phase 4 Storm Sewer Grate Inlets in Sump -Design Analysis Inlet Open Area 010 D10 D10 0100 D100 D100 No. sf cfs ft. in. cfs ft. in . 1 4.52 5.37 0.243 2.92 7.35 0.455 5.46 Grate is an East Jordan Iron Works 36" grate, V-5736 Assume 50% clogging for design APPENDIXE Storm Sewer Pipe Design Summary Castle Rock-Phase 4 Storm Sewer Pipe Summary (10-yr Storm) Pipe Pipe Length Slope Contributing Contributing Size No. Drainage Areas Area Contributing Pipes c Tc 110 Q10 v Travel Time (In) (ft) (%) (Acres) (min) (In/hr) (cfs) (fps) (sec) (min) 401 42 82.89 0.30 Previous Phases 16.320 Existing 42" 0.55 42 4.013 36.02 6.10 14 0.23 402 42 94.48 0.50 413 16.950 P401 0.60 42.23 3.999 40.67 8.20 12 0.19 403 18 31 .00 1.00 411A, 4118 0.190 0.60 10.00 8.635 0.98 3.50 9 0.15 404 42 94.42 0.60 411A,4118,413,414A,4148 17.990 P401 ,P402, P403 0.60 42.42 3.988 43.04 8.30 11 0.19 501 18 31 .00 0.80 412 0.210 0.60 10.00 8.635 1.09 3.60 9 0.14 502 24 122.09 0.60 412, 415 2.770 P501 0.60 20.15 6.184 10.28 5.80 21 0.35 405 2-36 191 .80 0.80 411A,4118,412,413,414A, 20.760 P401,P402, P403,P404, P501 , 0.60 42.61 3.976 49.41 9.30 21 0.34 4148,415 P502 406 2-36 248.76 0.80 411A,4118, 412, 413,414A, 20.760 P401 , P402, P403, P404, P501 , 0.60 42.95 3.956 49.24 9.60 26 0.43 4148,415 P502, P405 408 18 30.43 0.40 403,404 0.620 0.60 10 8.635 3.21 4.10 7 0.12 409 24 46.97 0.30 2.010 402,403, 404,405 P408 0.52 32.00 4.749 4.96 4.50 10 0.17 407 18 128.42 1.00 401 2.870 0.40 32.80 4.679 5.37 6.00 21 0.36 410 24 127.98 0.45 401 ,402,403,404,405 4.880 P407, P408, P409 0.45 33.16 4.648 10.21 5.40 24 0.40 411 30 31.09 0.30 401 ,402,403,404,405,407, 5.760 P407, P408, P409. P410 0.46 33.56 4.614 12.23 5.20 6 0.10 409 412 30 268.08 0.30 401 ,402,403,404,405,406, 6.610 0.49 33.66 4.606 14.92 5.50 49 0.81 407,408,409 P407, P408, P409,P410. P411 Castle Rock-Phase 4 Storm Sewer Pipe Summary (100-yr Storm) Pipe Pipe Length Slope Contributing Contributing Size No. Drainage Areas Area Contributing Pipes c Tc 1100 Q100 v Travel Time (In) (ft) (%) (Acres) (min) (In/hr) (cfs) (fps) (sec) (min) 401 42 82.89 0.30 Previous Phases 16.320 Existing 42" 0.55 42 5.521 49.56 6.10 14 0.23 402 42 94.48 0.50 413 16.950 P401 0.60 42.23 5.503 55.96 8.20 12 0.19 403 18 31 .00 1.00 411A, 4118 0.190 0.60 10.00 11.639 1.33 3.50 9 0.15 404 42 94.42 0.60 17.990 0.60 P401 , P402, P403 42.42 5.487 59.23 8.30 11 0.19 411A,4118,413,414A,4148 501 18 31.00 0.80 412 0.210 0.60 10.00 11.639 1.47 3.60 9 0.14 502 24 122.09 0.60 412,415 2.770 P501 0.60 20.15 8.398 13.96 5.80 21 0.35 405 2-36 191 .80 0.80 411A,4118,412,413,414A, 20.760 P401 , P402, P403, P404,P501, 0.60 42.61 5.472 68.16 9.30 21 0.34 4148, 415 P502 406 2-36 248.76 0.80 411A,4118,412,413,414A, 20.760 P401, P402, P403, P404,P501 , 0.60 42.95 5.446 67.83 9.60 26 0.43 4148,415 P502, P405 408 18 30.43 0.40 403,404 0.620 0.60 10 11 .639 4.33 4.10 7 0.12 409 24 46.97 0.30 2.010 P408 402,403, 404,405 0.52 32.00 6.498 6.79 4.50 10 0.17 407 18 128.42 1.00 401 2.870 0.40 32.80 6.405 7.35 6.00 21 0.36 410 24 127.98 0.45 401 ,402,403,404,405 4.880 P407,P408,P409 0.45 33.16 6.364 13.97 5.40 24 0.40 411 30 31 .09 0.30 401, 402,403,404,405,407, 5.760 P407, P408, P409. P410 0.46 33.56 6.319 16.74 5.20 6 0.10 409 412 30 268.08 0.30 401 ,402,403,404,405,406, 6.610 0.49 33.66 6.308 20.43 5.50 49 .0.81 407,408,409 P407, P408,P409, P410. P411 Castle Rock-Phase 4 Storm Sewer Pipe Design Analysis (10 yr Storm) Pipe Pipe Pipe Nonnal Surcharged Downstream Upatream Upatream Structure No. Size Length Pipe Q10 V10 Depth HGL10 TOP Pli>e HGL10 TOP Pl1><1 HGL10 Minor lo•• Minor Lo•• HGL10 (lnchea) (feet) Slope (cfa) (fpa) (feet) Slope Structure Elev. FL Elev. Structure Elev. FL Elev. Structure CoefT. (feet) Elev. 406 42 248.76 0.80% 49.24 9.57 1.85 0.23% Ditch 270.89 274.39 JB3 278.30 272.88 274.96 JB3 0.25 0.36 275.32 ----405 42 191.80 0.80% 49.41 9.57 1.85 0.23% JB3 278.30 272.98 275.32 JB2 281.50 274.51 276.36 JB2 0.25 0.36 276.72 404 42 94.47 0.60% .43.04 8.30 1.86 0.18% JB 2 281.50 274.61 276.72 17 280.86 275.17 277.03 17 0.25 0.27 277.30 402 42 94.48 0.50% 40.67 8.19 1.79 0.17% 17 280.86 275.27 277.30 16 281.42 275.74 277.53 16 0.50 0.52 278.05 401 42 82.89 0.30% 36.02 6.11 2.06 0.13% 16 279.34 275.84 278.05 276.09 278.16 ,_ ---- -502 24 122.09 0.60% 10.28 5.70 1.24 0.42% JB2 281.50 276.11 277.35 110 280.86 276.83 278.07 110 0.25 0.13 278.20 501 18 31.00 0.80% 1.09 3.60 0.36 0.25% 110 280.86 277.33 278.20 19 280.86 277.58 278.27 19 1.25 0.25 278.53 - - 403 18 31.00 1.00% ~ 3.78 0.32 0.22% 17 280.86 277.27 277.59 18 280.86 277.58 277.90 18 1.25 0.28 278.18 - - 412 30 268.08 0.30% 14.92 4.89 1.49 0.13% CHANNEL 271.79 274.29 15 278.12 272.59 274.64 15 0.50 0.19 274.82 ----411 30 31.09 0.30% 12.23 4.68 1.31 0.09% 15 278.12 272.69 274.82 14 278.12 272.78 274.85 14 0.25 0.09 274.94 ------------410 24 127.98 0.45% 10.21 5.00 1.40 0.42% 14 278.12 273.28 274.94 JB1 278.40 273.86 275.47 JB1 0.25 0.10 275.57 ~ ~ 409 24 46.97 0.30% 4.96 3.73 0.96 0.11% JB1 278.40 273.96 275.57 12 278.12 274.1 275.62 12 0.25 0.05 275.68 ~ 408 18 30.43 0.40% 3.21 3.71 0.81 0.26% 12 278.12 274.60 275.68 13 278.12 274.72 275.76 13 1.25 0.27 276.02 -------- ----~ ---- 407 18 128.42 1.00% 5.37 5.93 0.84 0.55% JB1 278.40 274.62 275.57 11 278.50 275.90 276.74 11 1.25 0.68 277.42 Notes 1. Friction losses and minor losses for 18" diameter oioe are comouted as for a 15.6" diameter pipe which represents a 25% reduction in pipe flow area. 2. Friction losses and minor losses for 24" diameter pioe are comouted as for a 20.8" diameter pipe which represents a 25% reduction in pipe flow area. 3. HGL at storm sewer outfall is based the higher of: 1) FEMA BFE lif available) or 2 soffitt of the storm sewer. 4. HGL at uostream of pipe run is the higher of: 1) Normal Depth or 2) HGL based on Surcharged HGL Slope 5. Too Elev. Is too-of-curb for Junction Boxes and to"-"f-curtl for Inlets. I I Castle Rock-Phase 4 Storm Sewer Pipe Design Analysis (100 yr Storm) HGL100 Depth Pipe Pipe Nonn•I Surcharged Downstream Upstream Upstream Stnu:ture Below Plpo Size Lenath ____f!e!_ Q100 V100 Depth HGL100 Too p; .. HGL100 Too Pipe HGL100 Minorlo11 Minorlo11 HGL100 Gutter No. llH I) (lnchH) (feet) Slooe (ch) (fps) (feet) Slope Structure Elev. FL Elev. Structure Elev. FL Elev. Structure Coelf. (IHI) Elev. 406 42 248.76 0.80% 67.83 10.27 2.27 0.45% Ditch 270.89 274.39 JB3 278.30 272.88 275.51 JB3 0.25 0.41 275.92 1.88 ----------------405 42 191 .80 0.80% 68. 16 10.29 2.28 0.45% JB3 278.30 272.98 275.92 JB2 281.50 274.51 276.79 JB2 0.25 0.41 277.20 3.80 ----404 42 94.42 0.60% 59.23 8.91 2.28 0.35% JB 2 281.50 274.61 277.20 17 280.86 275.17 277.53 17 0.25 0.31 277.84 2.52 402 42 94.48 0.50% 55.96 8.81 2.19 0.31% 17 280.86 275.27 277.84 16 281.42 275.74 278.13 16 0.50 0.60 278.74 2.18 ,_ 401 42 82.89 0.30% 49.56 6.48 2.59 0.25% 16 279.34 275.84 278.74 276.09 278.94 ------------- 502 24 122.09 0.60% 13.96 6.19 1.35 0.80% JB2 281 .50 276.11 277.46 110 280.86 276.83 278.44 110 0.25 0.15 278.59 1.77 ----501 18 31.00 0.80% 1.47 3.87 0.40 0.04% 110 280.86 277.33 27e:59~ 19 280.86 277.58 278.80 19 1.25 0.29 278.89 1.47 ----------403 18 31 .00 1.00% 1.33 4.07 0.36 0.04% 17 280.86 277.27 277.84 18 280.86 277.58 277.94 18 1.25 0.32 278.26 2.10 --------I------ --------412 30 268.08 0.30% 20.43 5.19 1.87 0.24% CHANNEL 271.79 274.29 15 278.12 272.59 274.93 15 0.50 0.21 275.14 2.48 ----411 __ 3_0_ 31.09 0.30% 16.74 5.00 1.59 0.16% 15 278.12 272.69 275.14 14 278.12 272.78 275.19 14 0.25 0.10 275.29 2.33 ----410 24 127.98 0.45'~ 13.97 5.48 1.51 0.80% 14 278.12 273.28 275.29 JB1 278.40 273.86 276.31 JB1 0.25 0.12 276.43 1.47 --------409 __ 2_4_ 46.97 0.30% 6.79 4.03 1.06 0.19% JB1 278.40 273.96 276.43 12 278.12 274.1 276.52 12 0.25 0.06 276.58 1.04 408 18 30.43 0.40% 4.3 4.00 0.88 0.35% 12 278.12 274.60 276.58 13 278.12 274.72 276.69 13 1.25 0.31 277.00 0.62 - ----~ 18 128.42 1.00% 7.35 6.43 0.92 1.10% JB1 278.40 274.62 276.43 11 278.50 275.9 277.84 11 1.25 0.80 278.64 -0.64 ~ Notes 1. Friction losses and minor losses for 1 B" diameter pipe are computed as for a 15.6" diameter pipe which represents a 25% reduction in pipe flow area. 2. Friction losses and minor losses for 24" diameter nice are computed as for a 20.8" diameter nice which reoresents a 25% reduction in pine flow area. 3. HGL at storm sewer outfall is based the hioher of: 1 l FEMA BFE !ff available I or 21 soffitt of the storm sewer. I I 4. HGL at upstream of pipe run is the higher of: 1) Normal Depth or 2) HGL based on Surcharged HGL Slope I I 5. Too Elev. Is too-<if-<:urtl for Junction Boxes and too-<if-curti for Inlets. I I I I EXHIBIT A Drainage Area Map