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Home My WebLink AboutAppendix D ~ Technical Design StandardPart 2 - Proiect Administration Start (Page 2.1) Engineering and Design Professionals Information Engineering Firm Name and Address: SN a . , /AI C, 171(o BRiazow DDa., .S E Roc &y00 IX 778 02. - 2 77 t.. Jurisdiction City: Bryan ✓ College Station Date of Submittal: / Z Lead Engineer's Name and Contact Info.(ph ne, e-mail, fax): ADAvn - J• BRonEkLiG 14 a bct4n,bece Cor°satrPer: coni P 79 ) 73 / - scco Other: Supporting Engineering / Consulting Firm(s): kq4 Other contacts: Developer / Owner / Applicant Information Developer / Applicant Name and Address: /46.0 N91LLENN turn FTKESS Ccf LTD. c fo Ley IsHA n /gat w drt.c.A, MR■A R/ q! Tx, 77807 gin nd a -mail: Z3 Wry. Lgel i tclubs. Go►n Property Owner(s) if not Developer / Applicant (& address): Phqne and e-mail: (975) 7t 4-5,85 - neink.lxt.lrrtm@csr►ed •{2,- . Ca n G. mEDrc,4- 060162 `/o FlNak Aaerr►�an) llc04 Poct IPRAdatc R6 6%4E66 s7AVO'‘ l 77545 Project Identification Development Name: j FrT LdEtAtess Ct j`Ei Is subject property a site project, a single -phase subdivision, or part of a multi -phase subdivision? 517 TRoiEcr If multi - phase, subject property is phase of . Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B -3a) Lar7 PcocK 3, L.O. FA rnewoRAL Stiaol )LS ex) l3 AsC 2 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. N/A General Location of Project Area, or subject property (phase): J jErao C5 mebrONL C6052. 4- Lpu( nRE Der v Alatal of 1 /C.S {/EAT In City Limits? 1/ Bryan: acres. Extraterritorial Jurisdiction (acreage): =➢ fa _ _- Bryan: - • - ge Station: Acr- - - outside ETJ: College Station: (P.20 acres. SECTION IX Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 I' l.r I,� Part 2 — Project Administration Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or subject property: L&m'R aR iva- ilrEtin S ff - R) 'ft E6-r Abutting tracts, platted land, or built developments: CS ►sieb C& ; QCs 1 i Named Regulatory Watercourse(s) & Watershed(s): L. ICik 6IMK 101 =N1 a5nE - J Tributary Basin(s): Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: Final Plat File #: Date: Status and Vol /Pg: Name: If two plats, second name: File #: Status: Date: Zoning Information For Pro or Subject Property (or Phase) Zoning Type: Fb Existing 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): C, m ►�U ! i ij oN 3 ZOl[ i; 03, Participants: _ \\ -- nitiffr �BINsOti t4 i1cATh ), S % . EVE l� GCN LA� rneAUG/ Leo I. i I mson" AbAm gRa { Preliminary Report Required? NV Submittal Date Review Date Review Comments Addressed? Yes No In Writing? When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any. N A SECTION IX STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY Effective February 2007 Part 2 — Project Administration Continued (page 2.3) Coordination For Project or Subject Property (or Phase) Note: For any Coordination of stormwater matters indicated below, attach documentation describing and substantiating any agreements, understandings, contracts, or approvals. Coordination With Other Departments of Jurisdiction City (Bryan or College Station) Dept. Contact: Date: Subject: /d /� Coordination With Non jurisdiction City Needed? f Yes No ✓ Summarize need(s) & actions taken (include contacts & dates): N f A Coordination with Brazos County Needed? Yes No Summarize need(s) & actions taken (include contacts & dates): N /A Coordination with TxDOT Needed? Yes No Summarize need(s) & actions taken (include contacts & dates): IA Coordination with TAMUS Needed? � Yes No t/ Summarize need(s) & actions taken (include contacts & dates): ikti�( � 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 a Approved . Status of Actions (include dates) US Army Crops of Engineersr No v Yes US Environmental Protection Agency No 1O' Yes Texas Commission on Environmental Quality No `°'.� Yes Brazos River Authority No Yes SECTION IX STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Effective February 2007 Part 3 — Property Characteristics Start (Page 3.1) Nature and Scope of Proposed Work Existin.: Land proposed for development currently used, including extent of impervious cover? \it%O.,0T IA) ITN Lid cA,c c sissri'G o' ( ,ci *, fg, -fize.E Site Development Project (select all applicable) Redevelopment of one platted lot, or two or more adjoining platted lots. Building on a single platted lot of undeveloped land. Building on two or more platted adjoining lots of undeveloped land. Building on a single lot, or adjoining Tots, where proposed plat will not form a new street (but may include ROW dedication to existing streets). Other (explain): Subdivision Development Project t---Construction of streets and utilities to serve one or more platted lots. Construction of streets and utilities to serve one or more proposed lots on lands represented by pending plats. Describe Nature and Size of Pro 4 osed Site projects: building use(s), approximate floor space, impervious cover ratio. Subdivisions: number of lots by general type of use, linear feet of streets and drainage easements or ROW. Tiv0 - slpfq rnebic4L 12pi tz Yrajh 4- HEN 114 CL OG P:)caL pot„ to r 3q coo 5F I oI ACC I m COV6f. - o? Project Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? No Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse (Section II, Paragraph B1) or a tributary thereof? No Yes Is any part of subject property in floodplain area of a FEMA - regulated watercourse? No Yes Rate Map Encroachment(s) into Floodplain areas planned? No Encroachment purpose(s): Building site(s) Road crossing(s) Utility crossing(s) Other (explain): 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. )4 /4 SECTION IX STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Continued (Page 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic analysis been done for larger area including subject property? Yes Reference the study (& date) here, and attach copy if not already in City files. BG5 IfENa AaNin9 Ps(TE AvALySIS ray illigHezt 4 1914 ( `! Is the stormwater earlier study? manage nt plan for the property in substantial Yes No If not, explain how conformance with the it differs. No If subject property plan for the property is not part of multi -phase project, describe stormwater management in Part 4. If property is part of multi -phase project, provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. Do existing topographic features on subject property store or detain Describe them (include approximate size, volume, outfall, model, etc). runoff? ✓ No Yes Any known drainage or flooding problems in areas near subject property? Identify: t/ No Yes Based (see Table on location of B -1 in Appendix Detention is required. study property in a watershed, is Type 1 Detention (flood control) needed? B) Need must be evaluated. Detention not required. If the need for Type 1 Detention must be evaluated: What decision has been reached? By whom? ejE T I o ti 's ? e thi F A j S - - • How was determination made? gE01E OF EystS7„o& REcoiwNt, /rUWk3WuJ (12c « c-ri y 4' PacVbs ,t5D Posr — D eve- oPn-€•)T F w SECTION IX STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY Effective February 2007 Part 3 — Property Characteristics Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Ph e) (continued) Does subject property straddle a Watershed or Basin divide? describe splits below. In Part 4 describe design concept No Yes If yes, for handling this. Watershed or Basin Larger acreage Lesser acreage __ - -- Above - Project Areas(Section II, Paragraph B3 -a) Does Project Area (project or phase) receive runoff from upland areas? Size(s) of area(s) in acres: 1) 2) 3) Yes 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable Watercourse or tributary); S r - IALLo CoNCe T ft ?t,, concentrated section(s), small creek (non - regulatory), regulatory 0\{E12,_CNoP S )tpr,.) Lo ITFf Lim, cc-0 Flow determination: Outline hydrologic methods and assumptions: 0 F Jim 'Alai . PAT /0(0At.._ V'i en uo (1 feu/ 1 1,1, 4 ,.. ‘ TG Doe storm runoff drain from public easements or ROW No Yes If yes, describe facilities in easement onto or across subject property? or ROW: Are changes in runoff characteristics subject to change in future? Explain 1`IO Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property drain across lowerproperties before reaching a Regulatory Watercourse or tributary? No ✓ Yes Describe length and characteristics of each conveyance property(ies). PO(ZIIoto baisiNS `ID S kliA T I EN►'t00 Tlf50 RI Lco &rnIPC- DR 91bRr &I 5EkJY2' ■ Rt pathway(s). Include ownership of Po,ob vIt\N SAaftsteDQ,Ifieukbi `� skit. tr rA fOlte7 s7rvt WceQ �, ttic v GS �� G 1) I�J"MON i)ti l To BERM (nr mow, R . SECTION IX Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 3 — Property Characteristics Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways (continued) Do drainage easements exist for part of pathv(s)? ✓✓ No any If yes, for what part of length? % Created by? plat, or instrument. If instrument(s), describe their provisions. Yes Pathway Areas Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired ?) 13 C>S fir TD ' (1S 50U714 / S TiNeT! Pc UEveae CarnMR2t Nkc, . / / / GS mew 0 Tile, i s 4 Hvspi L S iTL; SEE R a Nearby Drainage Facilities Describe any built or improved drainage facilities existing bridges, Tined channels, buried conduit, swales, detention 1BcS H€Pcer i-Vss Ex bbl thw Pwvb TEAT R ■RAe DE UEcq*I61vT 1P2os C near the property (culverts, ponds, etc). Actocmi F24 c G S fr'? Rf_P i Mks C - -y_ be7 7J a,, , SEE Do any of design? eGS Me42 Pc6 t Fb Pcpt- these have hydro gic or hydraulic influence on No V Yes If yes, explain: proposed stormwater -)/ mcrtT R9w f r s C- CS mbO CEu7L4 CA LCS cm,. —sac,: mu( Pl Ec E t t.1c tL - beuet , n rt�.,ws (4' t-c 3E PAD (A Ex. Aric !MPaelA 2tlZ it BA4� SECTION IX STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY Effective February 2007 Part 4 — Drainage Concept and Design Parameters Start (Page 4.1) Stormwater Management Concept Discharge(s) From Upland Area(s) If runoff is to be received from upland areas, what design drainage features will be used to accommodate it and insure it is not blocked by future development? Describe for each area, flow section, or discharge point. k /A Discharge(s) To Lower Property(ies) (Section 11, Paragraph El) Does project in de drainage features (existing or future) proposed to come public via platting? No Yes Separate Instrument? No Yes Per Guidelines reference above, how will runoff be discharged to neighboring property(ies)? ab ►fishing Easements (Scenario 1) Release (Scenario 2) Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit # ) Pi A Scenario 2: Provide general description of how release(s) will be managed to pre - development conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit # ) srf- r — tEu L 1 TD p6s NEAa-T ; 60r- ON 6S mr:Pe -PTL C- J- s /X; S Reba i 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 propo design been coordinated with owner(s) of receiving property(ies)? No Yes Explain and provide documentation. molt N 1 z b EvEio'nnaT ri TD t.fE/ V/fsoo-S 4. 5Psrn6 amvc -25 of GS mth c6- tXUmv Ttii s PAo3 i — ee RAT SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project Will project result in shifting runoff between Basins or between Watersheds? No Identify gaining Basins or Watersheds and acres shifting: 1\i/Ac What design and mitigation is used to compensate for increased runoff from gaining basin or watershed? / n r 1'c 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 & locaton of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit # ) REL S rrtJ IFRe 17 Ev>L r t? -tiffs ro Rcs kfE -T r (= fE-4) PaN0 %z- mtm zoo g t>t2T) S �_ � _ ___ 2. For Overall Project Area (type & location of facilities): (Attached Exhibit # ) Con&TAuc o N- s rig STca'ise- a- 4 rktDO , F cA ?sue 0 F C5 k15 C&via Tit Ptiv6. See C 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)? Are other Best Management Practices for reducing stormwater pollutants proposed? No Yes Summarize type of BMP and extent of use: If design of any runoff - handling facilities deviate from provisions of B -CS Technical Specifications, check type facility(ies) and explain in later questions. Detention elements Conduit elements Channel features Swales Ditches Inlets Valley gutters Outfalls Culvert features Bridges Other SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? ' No Yes Identify type and general size and In which phase(s). If detention /retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): E^'7•0 t> %VOW / JF ) aF t. GS mE ILe�i 6t6 `rm The 5k) t F fie; `7frs GO/U_ i3& C Lrj& Rk'oa To 517FK E by Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier analysis and report for larger area? Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? ditches use Yes Steepest side slopes: Usual front s opes: Usual back slopes: Flow line slopes: least Typica distance from travelway: (Attached Exhibit # ) typical greatest Are longitudinal culvert ends in compliance with B -CS Standard Specifications? Yes No, then explain: At inter tions or otherwise, do valley gutters cross arterial or collector streets? No Yes If yes explain: Bets with cL gutter usecr Jo Are va gutters proposed to cross any street away from an intersection? No Yes Explain: (number of locations ?) SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Are streets with curb and gutter used? (continued) Gutter line slopes: Least 0,80. Usual 01 0- Greatest 2.3 - A Are inlets recessed on arterial and collector streets? Yes No If "no ", identify where and why. PA I uK' E 5 77EL r °' 14 /0 61 ‘ Will inlets capture 10 -year desig 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 al able water spread for 10 -year design storm throughout site (or phase)? Yes No If no, explain. Sag curves: Are inlets placed at low points? `-- Yes No Are inlets and condu ized to prevent 100 -year stormflow from ponding at greater than 24 inches? Yes No Explain "no" answers. n"in combination of ROW and buried conduit on Will 100 -yr stormflow be contai�e� whole length of all streets? Yes No If no, describe where and why. " PRlvk 57f T— q,, 3 ,,,.T 1 6--, Do des' ns for curb, gutter, and inlets comply with B -CS Technical Specifications? Yes No If not, describe difference(s) and attach justification. Is storm drain system used? No L es Are any 12 -inch laterals used? No Yes Identify length(s) and where used. Pipe runs between system access points (feet): Typical / n9 Longest /8 Are junction boxes used at each bend? f Yes No If not, explain where and why. Are dow ream soffits at or below upstream soffits? Yes No If not, explain where and why: Least amount that hydraulic grade line is below gutter line (system- wide): I / _ 9to wINsrn mobEL SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Storm drain system (continued) (on separate sheet provide same info. for more instances) (s)IlelinO Describe watercourse(s), or system(s) receiving system discharge(s) below (include design discharge velocity, and angle between converging flow lines). 1) Watercourse (or system), velocity, and angle? tTEJ4DON ?ogb 00) G mth P "r" TY" A I' CFs 2) Watercourse (or system), velocity, and angle? 3) Watercourse (or system), velocity, and angle? For each outfall above, what measures are taken to prevent erosion or scour of receiving and all facilities at juncture? 1 ) (Coe, F k c r C f i L 2) 3) Are swales used to drain streets? No Yes Are s swale situated along property lines between properties? No Yes () 9p p Y p p Number of instances: For each instance answer the following questions. Surface treatments (including low -flow flumes if any): Flow line slopes (minimum and maximum): Outfall characteristics for each (velocity, convergent angle, & end treatment). Will 100 -year design storm runoff be contained within easement(s) or platted drainage ROW in all instances? Yes No If "no" explain: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, grSite) (continued) Roadside Ditches Are roadside ditches used? No Yes If so, provide the following: ? Yes No Is 25 -year flow contained with 6 inches of freeboard throughout Are top of banks separated from road shoulders 2 feet or more? Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No Yes No For any "no" answers provide location(s) and explain: (on separate sheet provide same information for any additional instances) If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: Is 100 -year design flow contained in conduit/swale combination? If "no" explain: Yes No Space for 100 -year storm flow? ROW Easement Width Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): Access Describe how maintenance access is provided (to swale, into conduit): Instance 2 Describe general location, approximate length: Is 100 -year design flow contained in conduit/swale combination? If "no" explain: Yes No Space for 100 -year storm flow? ROW Easement Width Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): Access Describe how maintenance access is provided (to swale, into conduit): SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.7) Stormwater Management Concept (cont 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: Is 100 -year design flow contained in swale? Yes No Is swale wholly within drainage ROW? Yes No Explain "no" answers: 1 conciiittieceive rL v No Access Describe how maintenance access is provide: Instance 2 Describe general location, approximate length, surfacing: Is 100 -year design flow contained in swale? Yes No Is swale wholly within drainage ROW? Yes No Explain "no" answers: Access Describe how maintenance access is provided: Instance 3, 4, etc. If swales are used in more than two instances, attach sheet providing all above information for each instance. "New" channels: Will any area(s) of concentrated flow be channelized (deepened, widened, or straightened) or otherwise altered? No Yes If only slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. Will design replicate natural channel? Yes No If "no ", for each instance Channel improvements propos No Yes Expla describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year design flow, and amount of freeboard: Instance 1: Instance 2: Instance 3: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Channel Improvements (continued) Existing channels (small creeks): Are these used? ✓ No Yes If "yes" provide the information below. Will small creeks and their floodplains remain undisturbed? Yes No How many disturbance instances? Identify each planned location: For each location, describe length and general type of proposed improvement (including floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year design flow. Watercourses (and tributaries): Aside fro ringe changes, are Regulatory Explain below. Watercourses proposed to be altered? No Yes Submit full report describing proposed changes to Regulatory existing and proposed section size and shape, surfaces, alignment, length affected, and capacity, and provide full documentation and data. Is full report submitted? Yes No Watercourses. Address flow line changes, of analysis procedures If "no" explain: All Proposed Channel Work: For all proposed channel work, provide informal requested in next three boxes. If design is to replicate natural channel, identify location and lengt. re, and describe design in Special Design section of this Part of Report. giA Will 100 -year flow be contained with one,foriof freeboard? Yes No If not, identify location and explain: ; =" Are ROW / ease is sized to contain channel and required Yes No If not, identify location(s) and explain: maintenance space? SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.9) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) How many facilities for subject property project? ( For each provide info. below. For each dry -type facilitiy: Faci ity 1 Faci ity 2 Acres served & design volume + 10% 100 -yr volume: free flow & plugged /2J,53z N/A Design discharge (10 yr & 25 yr) 23,3c 21.9.2c As Spillway crest at 100 -yr WSE? Berms 6 inches above plugged WSE? ,✓ yes no yes no ✓ yes no yes no Explain any "no" answers: TRAPE3tt eta. Nor L,KELy'Ru &C " r tN►� >Av Recw For each facility what is 25 -yr design Q, and design of outlet structure? Facility 1: 5t— Fi gEri ?4 Rec.) ° t`4 J i cgs Facility 2: 71 yQ R : 2- I° 2 c- Do outlets and Ilways discharge into a public facility in easement or ROW? Facility 1: • • Yes No Facility 2: Yes No If "no" explain: For each, what is velocity of 25 -yr design discharge at outlet? & at spillway? Facility 1: & Facility 2: & Are energy dissipation measures used? No ✓Yes Describe type and location: goc "PP * Eikellicno 5W PsLE D'< po 7b buLE FEND 0F ern), &gAn'. i?OAb For each, is spillway surface treatment other than concrete? Yes or no, and describe: Facility 1: M.7 Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Re 2, p_? Facility 2: If berms are used give heights, slopes and surface treatments of sides. Facility 1: Facility 2: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Detention Facilities (continued) Do structures comply with B -CS Specifications? Yes or no, and explain if "no ": Facility 1; 10e Facility 2: For additional facilities provide all same informati on a separate sheet. Are parking areas to be used for detention? No Yes What is maximum depth due to required design storm? Are culverts used at private crossings? y No Yes 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: Are culverts parallel to public roadway alignment? Yes No Explain: 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. How many instances? Describe location and provide information below. Location 1: Location 2: Location 3: For each location enter value for: 1 2 3 Design year passing without toping travelway? Water depth on travelway at 25 -year flow? Water depth on travelway at 100 -year flow? For more instances describe location and same information on separate sheet. SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) (for more instances of any type describe location and same information on separate sheet) Named Regulatory Watercourses (& Tributaries): Are culverts proposed on these assumptions, support proposed ", explain: facilities? No Yes, then provide full report documenting that If "no criteria, analysis, computer programs, and study findings design(s). Is report provided? Yes No Arterial or Maior Collector Streets: Will culverts serve these types of roadways? For each identify the No Yes How many instances? location and provide the information below. Instance 1: Instance 2: Instance 3: Yes or No for the 100 -year design flow: 1 2 3 Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? Is velocity limited per conditions (Table C -11)? Explain any "no" answer(s): Minor Collector or Local Streets: Will culverts serve these types for of streets? each identify the No Yes How many instances? location and provide the information below: Instance 1: Instance 2: Instance 3: For each instance enter value, or "yes" / "no" for: 1 2 3 Design yr. headwater WSE 1 ft. below curb top? 100 -yr. max. depth at street crown 2 feet or less? Product of velocity (fps) & depth at crown (ft) = ? Is velocity limited per conditions (Table C -11)? Limit of down stream analysis (feet)? Explain any "no" answers: SECTION IX STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Effective February 2007 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.12) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Culverts (continued) All Proposed Culverts: For all proposed culvert facilities (except veway /roadside boxe . ditch intersects) provide information requested in next eight Do culverts and travelways intersect at 90 degrees? Ye No If not, identify location(s) and intersect angle(s), and justify the des' n(s): Does drainage way alignment change within or nea(limits of approaches thereto? No Yes If "ye,& identify location(s), culvert and surfaced describe change(s), and justification: / Are flumes or conduit to discharge int2/culvert barrel(s)? No Yes If yes, identify location(s) and provide justifJation: Are flumes or conduit to disc rge into or near surfaced approaches No Yes If "y , " identify location(s), describe to culvert ends? outfall design treatment(s): Is scour /erosion pr ection provided to ensure long term stability of culvert structural components, and urfacing at culvert ends? Yes No If "no" Identify locations and pr ide justification(s): / Will 100- flow and spread of backwater be fully contained in drainag easements/ ROW? Yes No if not, why street ROW, and /or not? l D appreciable hydraulic effects of any culvert extend downstream l ye land(s) not encompassed in subject property? yes" describe location(s) and mitigation measures: or upstream to No Yes If Are all culvert designs and materials in compliance with B -CS Yes No If not, explain in Special Design Section Tech. Specifications? of this Part. SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.13) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) 7 Bridge(s) Is a bridge included in If "yes" provide the following plans for subject property project? V No Yes information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? A full report supporting all aspects of the proposed bridge(s) hydrologic, and hydraulic factors) must accompany this summary provided? Yes No If "no" explain: (structural, geotechnical, report. Is the report Water Quality Is a Stormwater Pollution Prevention Plan (SW3P)10� established for project construction? No Yes Provide a general description of planned techniques: (AN-0c_ P� t� R iP Sib/42,( iC) C' NC – Wrl- EG mEP ukEs `,IA/ ecLc ity, ce 510- "x'c)/ Cq,vinkcl- (-J1L(. COThOLy (A) 776 "PbES REQut2cm CtuTS , Special Designs – Non - Traditional Methods Are any non - traditional methods repjjation, BMPs for water quality, ✓✓ No Yes If "yes" list (aquatic echosystems, wetland -type detention, natural stream etc.) proposed for any aspect of subject property project? general type and location below. r '~ Provide full report about the proposed expected benefits. Report must be compromised, and that mainte solution(s). Is report provi.,. special de,sigticgiincluding rationale substan at stormwater management a cost will not exceed those of Yes No If "no" explain: for use and objectives will not traditional design SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) , 21/ Special Designs — Deviation From B -CS Technical Specifications If any design(s) or material(s) of traditional runoff - handling facilities B -CS Technical Specifications, check type facility(ies) and explain by Detention elements Drain system elements deviate -f om provisions of s cific detail element. Channel features Inlets Outfalls Culvert features Swales Ditches / Valley gutters Bridges (explain in bridge re rt) In table below briefly identify specific element, justificati for deviation(s). Specific Detail Element Justification for D iation (attach additional sheets if needed) 1) r 2 ) 3) f r 4) 5) // Have eleme s been coordinated with the City Engineer or her /his designee? For each item above pro de "yes" or "no ", action date, and staff name: 1) �,'� y 2) / ) Design Parameters Hydrology ,✓ Is a map(s) showing all Design Drainage Areas provided? ✓ Yes No Briefly summarize the range of applications made of the Rational Formula: 7 ASS �°b-S TNfrN sokcizes k lc- /MN 0 F /Ormiu, 7FS. What is the size and location of largest has been applied? 4.7 acres Design Drainage Area to which the Rational Formula Location (or identifier): b4 A " SECTION IX STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Effective February 2007 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making deter nations for time of concentration, was segment analysis used? No Yes In approximately what percent of Design Drainage Areas? /CD % As to intensity- duration - frequency and rain depth criteria for criteria other than those provided in these Guidelines used? identify type of data, source(s), and where applied: deter ing No runoff flows, Yes were any If "yes" 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 14 PM Storm drain system for Iecal streets. - /0 in Open channels Nia, NBA Swale /buried conduit combination in lieu of channel (Uf1 N/A Swales NA NIA Roadside ditches and culverts serving them !U /A, NA Detention facilities: spillway crest and its outfall 2, 5, /o 'L5. 50� /6(D Detention facilities: outlet and conveyance structure(s) 2 5 , to 25 50 Sri /c0 Detention facilities: volume when outlet plugged tJ 4 _ j(ZjC, fjpcL. Ccic/fz Culverts serving private drives or streets NIq et* Culverts serving public roadways ,V/A 4 Bridges: provide in bridge report. N/ /u/A Hydraulics _ What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit Culverts Swales Channels Highest (feet per second) 7 BPS d- Lowest (feet per second) � BPS .re' Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For street gutters: For conduit type(s) ?t? 0.016 0.013 Coefficients: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? V No Yes Head and friction losses Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? Are elevation drops provided at inlets, manholes, and junction boxes? Explain any "no" answers: Yes �o O Yes No Doty .:_cu k 1v_< Ia os E 57 R-rn sevE-e Kg) Vts R c ,L. Ro lira ADD / Are hydraulic grade lines calculated eF iewrrfor design storm? VYes No For 100 -year flow conditions? Yes No Explain any "no" answers: /t £ /G0y� 1/61 Ac' loo t`'PoF7L ARC RCQur Fay t��tior�i� - 9701 stw� j What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: bZNT/eN) ,`sobs %AK 1) 7 Su m C Jae. 77 /Dy2 /Wye s7a 20-t Re % Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? Yes No Outside of straight sections, is flow regime within limits of sub - critical If "no" list locations and explain: NA flow? Yes No Culverts If plan sheets do not provide the following for each culvert, describe it here. y . For each design discharge, will operation be outlet (barrel) control or inlet control? Entrance, friction and exit losses: Bridge rovide all in bridge report SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Effective February 2007 Rtizr rniu. toviot 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 management needs and /or the development of facility designs proposed project? List them below, being sure to identify the software name and version, any applicable patches and the publisher 105 R ill ( �x f Ge PR l u k'r E S cu) of stormwater for subject property version, the date of the 5 Part 5 — Plans and Specifications Requirements for submittal of construction drawings and specifications not differ due to use of a Technical Design Summary Report. See Section III, Paragraph C3. Part 6 — Conclusions and Attestation Conclusions Add any concluding information here: Attestation Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Design Summary Drainage Report by signing and sealing below. "This report (plan) for the drainage design of the development named in by me (or under my supervision) in accordance with provisions of the Unified Drainage Design Guidelines for the owners of the property. All required by any and all state and federal regulatory agencies for the improvements have been issued or fall under applicable general permits." 6144' Affix 1,5f.74p1 Part B was prepared Bryan /College Station licenses and permits proposed drainage �..! . 4te " Licensed rofessional En• f+%' -er * • '� • pM J. BRUMBAUGH % State of Texas PE No. / C65� l l P .. 108506 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 #r ---- - ..■ 0 Ui En 0 w 00 0 < ce CL I T ' l 0 Z ID w II a a 0 w X a 0 o W 2 0 0 O a a 1- 0 i 11 - m o M ix w 0 w m o co S3INVA z 0 I- 0 LJ co 0 z 0 0 z z LJJ F- LU 0 Ui z F— LU 0 0 z 0 U z 0 F— z LU H- LU 0 a_ Li z c g 5 § z a a 05 g tr. 0 SV ..9151 - 1.10Z tO A.N I.fltoSC p4 NP.9---133H5\ MILO\ pen *41 ID UPAI, ,00,0000Vp.ry uoswom Loom\ \