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Home My WebLink AboutDrainage ReportDIX D -TECHNICAL DESIGN SUMMARY Part 2 — Proiect Administration Start (Page 2.1) Engineering and ;Design ProfessionaIsInformation Engineering Firm Name and Address: Jurisdiction Walter P. Moore & Associates, Inc. City: Bryan 1301 McKinney, Suite 1100 _ X College Station Houston, TX 77010 Date of Submittal: Lead Engineer's Name and Contact Info. (phone, e-mail, fax): Other: Kevin Sullivan (a) ksullivan@walterpmoore.com (p)713-630-7330 Supporting Engineering / Consulting Firm(s): Other ontact: Heatcher Guilslen N/A (p)713-349-3770 (e) hguillen@walterpmoore.com Developer [ Owner / Applicant Information Developer / Applicant Name and Address: Phone and e-mail: Weiner Development (o) 713-554-7608 Michael Coontz 520 Post Oak BLVD STE 850 (m) 713-319-4447 Houston, TX 77027 (a) mcoontz@weinerdevlopment.com Property Owner(s) if not Developer/ Applicant (& address): Phone and e-mail: Same as above Project Identification Development Name: Tower Point Site Development - Lot 15 Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision? Site Project If multi -phase, subject property is phase of Legal description of subject property (phase) or Project Area: (see Section 11, Paragraph B-3a) tF l All of Lot 15, Block 3, Tower Point Phase , in the City of College Station, Brazos County Texas 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): See Report In City Limits? Extraterritorial Jurisdiction (acreage): Bryan: acres. Bryan: College Station: College Station: _ 0.97 acres. Acreage Outside ETJ: STORMWAIFR DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY ...-.— Part 2 — Project Administration I Continued (page 2.2) Project Identification (continued) Roadways ahutting or within Project Area or I Abutting tracts, platted land, or built subject property: developments: Private Drive G and Highway 40 Lot 14 and Lot 16 i Named Regulatory WaterCOUrse(s) & Watershed(s): I Tributary Basin.(s): See Report ( See Report j —------------............... .....— Plat Information For Project or Subject Property (or Phase) Preliminary Plat File* N/A I Final Plat File #: Date: Name: Status and Vol/Pg: If two plats, second name: File #: — Status: Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: Existing or Proposed? Case Code: Case Date Status: Zoning Type: Existing or Proposed? Case Code: Case Date Status: --------- -- Stormwater Management Planning For Project or Subject Property (or Phase) — -- Planning—Conferenc--------e—s)— & Date(s): Participants N/A Preliminary Report Required? N/A 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. I. S DDRMWATER DESIGN GUIDEUINES Page 4 of 26 APPENDIX. D: TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY 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. De t Contact Date: Subject: Coordination With Other N/A Departments of ----- ---- -------- ---- Jurisdiction _____— City (Bryan or College Station) ----.__--- -- Coordination With Summarize need(s) & actions taken (include contacts &dates) Non -jurisdiction City Needed? Yes No X - Coordination with --- --- -- .- __ ------------- Summarize needs)&actions taken (include contacts &dates): Brazos County Needed? Yes No X Coordination with Summarize needs) & actions taken (include contacts & dates): TxDOT Needed? Yes No X Summarize need(s) & actions taken (include contacts & dates): Coordination with TAMUS Needed? Yes No X 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 ins aces below. Entity Permitted or Status of Actions (include dates) ? Approved - --- -- US Army Crops of j Engineers No X Yes US Environmental Protection Agency No X Yes _ Texas Commission on Environmental Quality No X Yes ------_. Brazos River— ._._.._............_........._-....------- --------------- -- - - -------------- . Authority- No X Yes _ ---� STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Start (Page 3 1) ................._ ..... Nature and Scope of Proposed Work Existing: Land proposed for development currently used, including extent of imperviouscover? Commercial / Runoff Coefficient 0.90 Site ' — Redevelopment of one platted lot, or two or more adjoining to atted lots. Development X Building on a single platted lot of undeveloped land. Project Building on two or more platted atted adjoining lots of undeveloped land. (select all _ Building on a single lot, or adjoining lots, where proposed plat will not form applicable) I a new street (but may include ROW dedication to existing streets). ' Other (explain): i Subdivision _ Construction of streets and utilities to serve one or more platted lots. Development Construction of streets and utilities to serve one or more proposed lots on Project lands represented by >I ending plats. Sit j e. 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 ' drainage easements or ROW. Nature and Size of Proposed Approximate 3,700 sq. ft. of commercial retail. Project Is any work planned on iffnd that is not platted yes, explain or on land for which platting is not pending? X No Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse No X Yes (Section II, Paragraph B1) or a tributary thereof? -- Is any part of subject property in floodplain No X Yes Rate Map area of a FEMA-regulated watercourse? Encroachments) i into Floodplain Encroachment purpose(s): _ Building site(s) _ Road crossing(s) areas planned? Utility crossing(s) Other (explain). No X 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. N/A STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2005 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. X Arrington Road and Decature Drive Infrastructure Improvement (March 2, 2007) Tower Point Infrastructure (October 7, 2009) I Is the stormwater management plan for the property in substantial conformance with the earlier study? Yes X No If not, explain how it differs. i No If subject property is not part of multi -phase project, describe stormwater management plan for the property in Part 4. If property is part of multi -phase project, provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. Do existing topographic features on subject property store or detain runoff? X No Yes Describe them (include approximate size, volume, outfall, model, etc). Any known drainage or flooding problems in areas near subject property? X No Yes Identify: -----_-_-------'--- Based on location of study property in a watershed, is Type 1 Detention (flood control) needed? (see Table B-1 in Appendix B) Detention is required. Need must be evaluated. _ Detention not required. What decision has been reached? By whom? I ! If the need fer How was determination made? Type 1 Detention must be evaluated: L- _. —. ....-..... ..... .... .. ..._..------- STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised Februa_ry,2009 DIX D -TECHNICAL DESIGN SUMMARY Part 3 - Property Characteristics Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) , Does subject property straddle a Watershed or Basin divide? X No Yes If yes, describesplitsbelow_ In Part 4 describe design concept for handling this. - - -- r Watershed or Basin Lar�e�r acreageacreage Lesser acreage iSpring Creek Above -Project Areas(Section II, Paragraph B3-a) Does Project Area (project or phase) receive runoff from upland areas? No X Yes Size(s) of area(s) in acres: 1) 1 A 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated recognizable concentrated section(s), small creek (non -regulatory), regulatory Watercourse or tributary); 1. Overland sheet flow Flow determination: Outline hydrologic methods and assumptions — Does storm runoff drain from public easements or ROW onto or across subject property? X 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 lower properties before reaching a Regulatory Watercourse or tributary? X No _ Yes Describe length and characteristics of each conveyance pathway(s). Include ownership of property(ies). STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February22002 APPENDIX D—TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) _ Conveyance Pathways (continued) Do drainage If yes, for what part of length? °l� Created by? _plat, or easements _instrument. if instrument(s), describe their provisions exist for any part of pathway(s)? X No _ Yes rroph,,re runoff must cross lower properties, describe characteristics of abutting lower erty(ies)_ (Existing watercourses? Easement or Consent aquired?) Pathway Areas .__. ___.. .......---. -. -___._._. Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). Existing storm sewer along Private Drive G. Nearby Drainage -- ...._.... .__........-----.,..._.._ Facilities Do any of these have hydrologic or hydraulic influence on proposed stormwater design? —No _X Yes If yes, explain: See report i ... ___ ___._ ......... ___._-_-_ ........ STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised Fe6ruary_2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4— Drainage Concept and Design Parameters Start (Page 4 1) 111 Stormwater Management Concept Discharge(s) From Upland Area(s) j 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, I I flow section, or discharge point. See Report and Construction Documents I Discharges) To Lower Pro perty(ies) (Section Il, Paragraph E1} Does project include drainage features (existing or future) proposed to become public via platting? X No _Yes Separate Instrument? No Yes Per Guidelines reference above, how will — Establishing Easements (Scenario runoff be discharged to neighboring Pre -development Release (Scenarioo 2) property(ea)? N/A _ Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit #------- I Scenaro 2. Prowde general description ofhow release(s) will be managed to pre -development i 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. i If Scenario 2, of Combination are to be used has proposed design been coordinated with owner(s) of receiving property(ies)? No Yes Explain and provide documentation. STORMWATER DESIGN GUIDELINES Page 10 of 26 APPENDIX, D- TECH_ DESIGN SUMMARY Effective February 200T As Revised February 200g APPENDIX D — TECHNICAL DESIGN SUMMARY _- Part 4 — Drainage Concept and Design Parameters Continued (Page 4.2) Stormwater Management Concept (continued) Within Proiect 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 Watersheds? from gaining basin or watershed? X No Regional Detention Basin NE of Arrington Rd, SW of HWY 6 _ Yes How will runoff from Project 1 —With facility(ies) involving other development projects. Areabe mitigated to pre- 'L X 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# ) 2. For Overall Proiect Area (type & location of facilities) (Attached Exhibit# 5 ) Regional Detention Basin 3. By phase for sitel proiect Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. _ I Are aquatic echosystems proposed? No __ Yes In which phases) or project(s)? o a > Are other Best Management Practices for reducing stormwater pollutants proposed? No X Yes Summarize type of BMP and extent of use: N C II' See Report and Construction Documents US N o 0 Z If design of any runoff -handling facilities deviate fromprovisions of B-CS Technical o. X Specifications, check type facility(ies) and explain in later questions. Detention elements Conduit elements Channel features a Swales — Ditches _ Inlets _ Valley gutters Outfalls Culvert features __ Bridges Other STORMWATER DESIGN ciubFLINES Page 11 of 26 APPENDIX D: TECH DESIGN SUMMARY Effective February 2007 As Revised Febmary 2009 D -TECHNICAL DESIGN Part 4 — Drainage Concept and Design Parameters 1 Continued (Page 4.3) 1 Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert(s)7 X 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): Convey through a public system 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? X Yes No, then summarize the difference(s): i Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? Steepest side slopes: Usual front slopes: Usual back slopes: � r w �q Flow line slopes: least Typical distance from travelway -o (Attached Exhibit # ) typical greatest a o N Z o X Are longitudinal culvert ends in compliance with B-CS Standard Specifications? 2 Yes No, then explain: Q At intersections or otherwise, do valley gutters cross arterial or collector streets? j No Yes If yes explain: U a N � Are valley gutters proposed to cross any street away from an intersection? Z _ No Yes Explain: (number of locations?) m X i STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters ! Continued (Page4.4) — -- — — Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes: Least Usual Greatest - -- -..-.-.- ..- -_-.. .-._.. ......... ..-..... i Are inlets recessed on arterial and collector streets? _Yes No If "no", identify where and why, j Will inlets capture 10-year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? Yes _ No If no, explain where and why not. a m Will inlet size andplacement prevent exceeding allowable water spread for 10-year design storm throughout site (or phase)? No If no, explain. —Yes o� a 9 Sag curves: Are inlets placed at low points? Yes No Are inlets and conduit sized to prevent 100-year stormflow from pending at greater than 24 inches? " o Yes No Explain "no" answers, U v _ 3 m m w 2 Will 100-yr stormflow be contained in combination of ROW and buried conduit on whole length of all streets? _ Yes No If no, describe where and why. Do designs for curb, gutter, and inlets comply with 8-CS Technical Specifications? Yes _ No If not, describe difference(s) and attach justification. Are any 12-inch laterals used? X No Yes Identify length(s) and where used. N Pipe runs between system Typical 38' Longest 79' W access points (feet): junction boxes used at each bend? X Yes _ No If not, explain where >, IAre and why. c t0 z° a I I EX _ Are downstream soffits at or below upstream soffits? Least amount that hydraulic w y — Yes X No If not, explain where and why: grade line is below gutter line I I (system -wide): i I � STORMWATER DESIGN GUIDELINES Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4— Drainage Concept and Design Parameters Continued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Describe watercourse(s).. or system(s) receiving system discharges) below a (include design discharge velocity, and angle between converging flow lines). ` 1) Watercourse (or system), velocity, and angle? 5 � See Report E 2) Watercourse (or system), velocity, and angle? o See Report `c o o w U G h E @ 3) Watercourse (or system), velocity, and angle? T � See Report � v o M 0 E For each outfall above. what measures are taken to prevent erosion or scour of o receiving and all facilities at juncture? o 1) N/A m `m a 2) d N 0 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) - r, m w } Flowline slopes (minimum and maximum). c m 0 o z Outfall characteristics for each (velocity, convergent angle, & end treatment). N f6 X 3 N N _ 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 Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 —Drainage Concept and Design Parameters Continued (Page 4.6) —Storm-mate; Management Concept -(continued) Within Or Serving Subject Property (Phase, or Site) (continued) j Are roadside ditches used? X No Yes If so; provide the following: N _ Is 25-year flow contained with 6 inches of freeboard throughout ? Yes No r Are top of banks separated from road shoulders 2 feet or more? Yes _ No Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No m For any "no" answers provide location(s) and explain: a m O If conduit is beneath a swale, provide the following information (each instance).. Instance-1 Describe general location, approximate length: w > Is 100-year design flow contained in conduit/swale combination? —Yes No If "no" explain: o m Space for 100-year storm flow? ROW Easement Width z c_ Swale Surface type, minimum Conduit Type and size, minimum and maximum X Im and maximum slopes: slopes, design storm: C O � a m m Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c c c L m U � G a m Access Describe how maintenance access is provided (to swale, into conduit): o -2 t6 o E m a v Instance 2 Describe general location, approximate length: a E m m m m a Is 100-year design flow contained in conduit/swale combination? —Yes —No oo If "no' explain: a a c E ii, Space for 100-year storm flow? ROW _ Easement Width os ..---- Swale Surface type, minimum - --------------------- Conduit Type and size, minimum and maximum '9 m and maximum slopes: slopes, design storm: a c m _ N Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): � � C 3 0 N Access Describe haw maintenance access is provided (to swale, into conduit): STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February_2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters 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: jInstance 1 Describe general location, approximate length. surfacing: m 0 o W r y Is 100-year design flow contained in Swale? _ _ Yes ......._ No Is swale wholly y _ within drainage ROW? Yes _ No Explain "no" answers: v cvi Access Describe how maintenance access is provide: 0 mI Z a c o X rInstance 2 Describe generaPlocation, approximate length, surfacing: ,a m c o � c o E m .c _3 m .----....... ._.....---_----— Is 100-year design flow contained in Swale? Yes No Is swale wholly within drainage ROW? Yes No Explain "no' answers: o 30 m Access Describe how maintenance access is provided: o s a 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. � c WIII design replicate natural channel? Yes No If "nd', for each instance o a describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year o W design flow, and amount of freeboard: �- N Instance 1: N E N > 0 Instance 2: a E o - Z X Instance 3: o ........._. ....._.I STORMWATER DESIGN GUIDELINES Page 16 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 ENDIX D - TECHNICAL DESIGN SUMMARY Part 4- Drainage Concept and Design Parameters Continued (Page 4.8) Stormwater Management Concept (continued) - Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels (small creeks): Are these used? 1' f "Yes" Provide the information below. Will small creeks and their floodplains remain undisturbed? Yes No How many disturbance instances? Identify each plann—ed locations 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. a c 1� Watercourses (and tributaries): Aside from fringe changes, are Regulatory o Watercourses proposed to be altered? _ No Yes Explain below. _ c Submit full report describing proposed changes to Regulatory Watercourses. Address c existing and proposed section size and shape, surfaces, alignment, flow line changes, � length affected, and capacity, and provide full documentation of analysis procedures P and data. Is full report submitted? Yes No If"no" explain: E ITS --- - — All Proposed Channel Work: For all proposed channel work, provide information 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. I I WWII 100-year flow be contained with one foot of freeboard? _Yes --_ No If not, identify location and explain: Are ROW r easements sized to contain channel and required maintenance space? _ Yes _ No If not, identify location(s) and explain: S-rORMWATER DESIGN GUIDELINES Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 X D -TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters , Continued (Page 4.9) Stormwater Management Concept (continued) j Within Or Serving Subject Property (Phase, or Site) (continued) .. .._..----- -.— f How many facilities for subject property projects For each provide info. below. j For each dry -type facilitiy: Facility 1 Facility 2 rAcres 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: m Y -- For each facility what is 25-yr design O, and design of outlet structure? Facility 1: 0 z Facility 2: X Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: —Yes —No Facility 2: —Yes No -moo If "no" explain: 0 oa 0 For each, what is velocity of 25-yr design discharge at outlet? & at spillway? ^—' Facility 1.: & Facility 2: & .5 Are energy dissipation measures used? No Yes Describe type and m LL location: 0 2 m E For each, is spillway surface treatment other than concrete? Yes or no, and describe: 4 Facility I 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 Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effertive February 2007 As Revised February. 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) i Do structures comply with B-CS Specifications? Yes or no, and explain if "no": Facility 1; Facility 2: c G o c .= o C U m 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? 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: N D1 o ._._.-..- — .............. _- Are culverts parallel to public roadway alignment? Yes No Explain: _ U N N N w } .Q I Creeks at Private Drives: Do private driveways, drives, or streets cross drainage m ways that serve Above -Project areas or are in public easements/ ROW? m z No _Yes If 'yes' provide information below. N X How many instances? Describe location and provide information below. Location 1: S U m Location 2: Location 3: For each location enter value for 1 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. STORNPNATER DESIGN GUIDELINES Page 19 of 26 APPENDIX, D: TECH, DESIGN SUMMARY Effective February 2007 As Revised tebruaiv 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulatory Watercourses (& Tributaries): Are culverts proposed on these facilities? _ No _ Yes, then provide full report documenting assumptions, criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? Yes No If "no", explain: Arterial or Maior Collector Streets. WIII culverts serve these types of roadways? N_ No Yes How many instances? For each identify the _ location and provide the information below. mInstance 1: u, instance 2: c o Instance 3: c om Yes or No for the 100-year design flow. 1 2 3 Z E o `c Headwater WSE 1 foot below lowest curb top? X .� -- .........._ ...... __- Spread of headwater within ROW or easement? Is velocity limited per conditions (Table C-11)? h C Explain any "no" answer(s): o c T 10 a � `6 E Minor Collector or Local Streets: Will culverts serve these types of streets? P No Yes How many instances? for each identify the _ location and provide the information below: rz Q � Instance 1: W c Instance 2: N_ m w o Instance 3: w" o I � c For each Instance enter value or yes 1 no' for 1 2 3 Design yr. headwater WSE 1 ft, below curb top? 1 00yr. max. depth at street crown 2 feet or less? E _— .-......- Product of velocity (fps) & depth at crown (ft) = ? --...... _t.-__..- ------ Is velocity limited per conditions (Table C-11)? Limit of down stream analysis (feet)? ! j i i i Explain any `no' answers: -- — --- ----- STORMWAfER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 STORM SEWER SYSTEM DESIGN CALCULATIONS 10 YEAR STORM EVENT \. �+r e € 55 d _ _ ar e eE_ €'pa 52s se= s.£5 / /I dI e a 85a d 12 IL A .. _ . �J If I i U i OL ill TTT. .MlGS (AWMM RAA1 Tc-IO WIMl16 1 a -ael as It uvula r�-,0 M.1(FS A ARR.fl T 4. IA{ NAS PIPES IX) c 10 MN116 0 . &W RS STFUL 8 NFA. O.m. (Pf%YO iLQA) m . KeanEs T, I {11 5111L - 1 ,a 4, T. - IO YXUI6 a A - 1v1 IFS �M:..IZ \ I usA. oal Mrns (owAwa RAA7 is . IY WI Y - 1{I 4R s I TOM n - N wwlfS M.�{,� I II 51$&NIE..IB 2 - 10 wnma A-uz In IffA . 159 Mt3 (RPr1 IN) n . to WMIt3 U s 1248 6$ Tc 9MEA - 0.19 M65 1Q.E8.MD flV.l) AR 4 AREA Q,S 'S (VA.WU flIIn MNJI6 4 -I.N o-$ MFA - 1.0 ivM3 (MPM 11) m wNn6 a-tlse a: 3�49tlEll ANA 1 6 06S PWFD 1M rc _ IY WOOL M . 112163 NFA - I'M Ams (RPm III) rt-IB WM6 0 - IIb3. _ ' BVAINAt ® _ S1R4Nff MXtlFA I. NL CVNAfn.IS RUN CWE2 FAWN STE 0.3YY1 2 MIYNII w [f W WgIM1kY1 - IB MNJI6 a Phut Lffrmolr. u.m wR Ml..ws a MANwac VlttruXNs PSES m 102w 9 BERT PRINTED GATE REMARKS 06/07/10 CRY SUBMITTAL 08/02/10 PER CRY COMMENTS 09/07/10 PER CRY COMMENTS REVISIONS NO. REMARKS 08/02/10 PER CITY COMMENTS 09/O6/10 PER CITY COMMENTS WALTER P MOORE WA�TEDD MooRE AID ,.. NNEY. ASI.E I „AN.To„..E.as „o,O P T.lE FIRM REGILLTAD 10N NUMBER 18. WDC WEINER DEVELOPMENT CORPORATION HOUSTON, TEXAS TOWER POINT INFRASTRUCTURE DEVELOPMENT DRAINAGE AREA MAP 6 CALCIL LATIONS P0.0JECT N0: 26-a.-. DRAWING NO: DATE: os/or/,o D STORM SEWER CALCULATIONS WALTER P. MOORE & ASSOCIATES, INC 1301 MCKINNEY, SUITE 1100 HOUSTON, TX 77010 LOCATION: Tower Point Lot 15 - College Station, TX BY: HMG DATE: 2/18/2011 CHECKED BY: DATE: JOB NO: 23-05040-13 MH/ MH/ AREA AREA SUM OF C*A SUM OF INTENSITY FLOW Tc 4t REACH DIAM. Width SLOPE MANNINGS DESIGN FALL FLOWLINE Yn ACTUAL HYDRAULIC CHANGE ELEVATION OF ELEVATION OF INLET INLET AREA C'A I Q Hei M "n" Q Full V full ELEVATIONS V GRADIENT IN HEAD HYDRAULIC GRADIENT GROUND FROM TO IF ACRES ACRES IN/HR) (CFS) (MIN MIN F IN IN % CFS FT/S F UPSTREAM DOWNSTREAM F FOS % F UPSTREAM DOWNSTREAM UPSTREAM I DOWNSTREAM 1-1 1-2 5055 0.12 0.12 0.10 0.10 8.63 0.90 10.00 0.19 56 12 0 1.00 - 0.009 5.146 6,55 0.56 316A0 315.54 0.28 4.93 1.000 0.560 304.090 303.53 319.10 318.85 1-2 1-3 4019 0.09 0.21 0.08 0.19 8.57 1.61 10.19 0.22 75 12 0 1,00 0.009 5.146 6.55 0.75 315.54 314.79 0.38 5.79 1.000 0.750 303.530 302.78 318.85 319A 1 1-3 14 5525 0.13 0.34 0.11 0.30 8.49 2.56 10.41 0.19 73 12 0 1.00 0,009 5.146 6.55 0.73 314.79 314.06 0.50 6.65 1.000 0.730 302.780 302.05 319.11 318 oo 1-4 OUTFALL 2992 0.07 0.58 0.06 0,52 8,43 L40 10.59 0.24 105 12 0 1.00 0.009 5.146 6.55 1.05 300.05 299.00 0.71 7.36 1.000 1.050 302.050 301.00 318.00 304.00 14A 1-4 7657 0.18 0.18 0.16 0.16 8,43 1.33 10.59 0.18 60 12 D 100 0.009 5.146 6,55 0.60 314.06 313.46 0.35 5.50 1.000 1 0.600 302.650 302.05 318.00 318.60 NOTES: 1. DESIGN BASED ON 2-YEAR RAINFALL 2. RUNOFF COEFFICIENT EQUALS 0.9 (5) 3. INTENSITY CALCULATIONS BASED ON CITY OF HOUSTON DESIGHN MANUAL CHAPTER 9 PAGE CH9/15 OF 17 4. TIME OF CONCENTRATION (T c) = 10A0 t16 + 15 MIN (USE =MIN) (6) 5. STARTING HGL EQUALS THE TOP OF INSIDE OF OUTFALL PIPE 6. ALL PIPES ARE CIRCULAR P:\23\2005\05040-13\Design & Studies\Calculations\2-18-11 05040-13 Drainage talcs 2/18/2011 ELECTRIC FACILITIES Exlstln9 = RED Proposed = CYAN Pad Mount Transformer Three Phase Fuse - Meter O—= Pole -- Parywa srrvc Eul.e b0' MC p FL�tlnBeH Grlmery WALTER P MOORE .-00 ma NO .23,06WB-66 i - - - ?tSYEAR -:: sflLitEq',5. Mr A}xl. It3LET EF€ET F?2Qfd' "I Tp R n SUM OF C`A SUFd CF AREA .. ` C'A: $.1CF2�$1-{A6RE5}' iNTE15{Tv (I } (SN%F#2) 1Dr.E R- Irf1Ef;SITY ' 1 4 J,_ (It4'HRS "1;T331'EAfi F[C vJ ..fl „CF5j T (tr1Ni. a: 1h91ta) R }GH (FT} 0IA41 `5,,OPE Fefght -- -:{1P1'-. :. 1%} : MAiJS1NGS 'il' .. 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Z= e= r. cApn, T I JY=_Ai R S `M1, I J _!iS P•-.L;T_t�. r �-'iL> E S_ i, .'J .'mil' 'r, F COLLEGE a -. r .. •:'C'F�Iti1-..�.....e''i' �.S r€ )! _I+kn i.",._ If._� ,_. .i.- t;0 .`4i �iIl_K) �i�%;!T._A2LS a�. =CN. .__WAL T--I453E if(r11-A.. PI 111F1PFS iE _._ W APPENDIX D —TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.12) Stormwater. Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside ditch intersects) provide' information requested in next eight Loxes. —_ Do culverts and'travelways intersect at 90 degrees? Yes No if not, identify Iocation(s) and intersect angie(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: Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? No Yes if "yes" identifylocation(s), describe outfail design treatment(s): c .E 0 Is scourlerosion protection provided to ensure long term stability of culvert structural 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 Lin subject, property? No Yes If "yes" describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B-CS Tech. Specifications? Yes No if not, explain in Special Design Section of this Part. STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February.2009 S APPENDIX D —'TECHNICAL DESIGN SUMMARY Part 4 —Drainage Concept and Design Parameters Continued (Page 4:13) Stormwater'Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Is a bridge included in plans for subject property project? No Yes If "yes provide the following information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? ai -a m` A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? Yes No If "no" explain: Is a Stormwater Provide a general description of planned techniques:_ w Pollution Prevention m Plan.(SW3P) Silt Fence, Inlet Protection, temporary construction entrance, c3 established for and seeding (see construction documents) m project construction? . No X Yes Special Designs — Non -Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream replication, BMPs for water quality, etc.) proposed for any aspect of subject property project? X 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? Yes No If "no" explain: STORMVVATER DESIGN GUIDELINES Page 22 of26 APPENDIX. D TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 PENDIX D —TECHNICAL DESIGN SUMMARY Part 4 Drainage Concept and Design Parameters I Continued (Page 4:14) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or'Site) (continued) ....... —_ _.._...,y ._..... Special Designs — Deviation From B GS Technical Specifications If an 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. Drains stem elements Channel features Detention elements y Outfalis Culvert features Swales Ditches Inlets Valley gutters Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviabon(s). Specific Detail Element Justification for Deviation (attach additional sheets if needed). 1} 3) 4) r2) ents been coordinated with the City Engineer or her/his designee? For eai vide "yes" or "no", action date, and staff name: Design Parameters Hydrology Is a map(s) showing all Design Drainage Areas provided? X Yes o Briefly summarize he range of:applications made of the Rational Formula: Use 0.9 runoff coefficeint design for 10-yr storm analyzed for 100-yr is (See Report) What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 9 acres Location (or identifier):. STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: As TECH. DedIGN SUM A Y Effective February 2007 SE APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and:. Design Parameters Continued (Page 4.15) Design Parameters (continued) Hydrology ,(continued) In making determinations for time of concentration, was segment analysis used? No . X Yes In approximately what percent of Design Drainage Areas? 100 qQ _._..__. — -- --... --- ........ -........ _...._ As to 'intensity -duration -frequency and rain depth criteria for determining runoff flows were any criteria other than those provided in these Guidelines used? X 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. 100-yr 10-yr Storm drain system for local. streets Open channels Swalelburied conduit combination in lieu of channel Swales Roadside ditches and culverts serving them Detention facilities: spillway crest and its outfall Detention facilities: outlet and conveyance structure(s) Detention facilities: volume when outlet plugged Culverts serving private drives or streets Culverts serving public roadways Bridges: provide in bridge report. Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit Culverts Swales Channels Highest (feet per second) 4.8 7.15 N/A N/A N/A Lowest (feet per second) 2.5 6.00 N/A N/A N/A Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used; For street gutters: For conduit type(s) RCP PVC Coefficients: 0.013 0.009 STORMWATER DESIGN GUIDELINES Page 24of 26 APPENDIX. D` TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY 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? X No — Yes Head and friction losses X No Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? X Yes No Are elevation drops provided at inlets, manholes, and junction boxes? X Yes No Explain any "no" answers. - Are hydraulic grade lines calculated and shown for design storm? X Yes No For I 00-year flow conditions? X — Yes No Explain any "ne answers: What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: N/A Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? N/A Yes No Outside of straight sections, is flow regime within limits of sub-critica,l flow?— Yes No If "no" list locations and explain: Culverts If plan sheets do notprovide the following for each culvert, describe it here. For each design discharge, will operation be outlet (barrel) control or inlet control? N/A Entrance, friction and exit losses: Bridges Provide all in bridge report N/A STORMVVATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 200 SECTION 'IX APPENDIX D - TECHNICAL DESIGNSUMMARY 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 N/A 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 Section111, 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 Part Q was prepared by me (or under my supervision) in accordance with provisions of the Bryan/College Station Unified Drainage Design Guidelines for the owners of the property. All licenses and permits required by any and all state and federal regulatory agencies for the proposed drainage improvements have been issued or fall tinder applicable general permits. (Affix Seal) Licensed Professional Engineer State of Texas PE No. STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX, D: TECH. DESIGN SUMMARY Effective February 2007 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 N/A 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 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 si nin and sealing below.. `This report (plan) for the drainage design of the development named in Part 8 was prepared by me (or under try supervision) in accordance with provisions of the Bryan/College Station Unified Drainage Design Guidelines for the owners of the property. All licenses and permits required by any and all state and federal regulatory agencies for the proposed drainage improvements have been issued or fall under applicable general pennits." (Affix Seal) Licensed Professional Engineer State of Texas PE No. STORMWATER DESIGN GUIDELINES Page 26 of 26 -`-� RY APPENDIX. D: TECH. DESIGN SUMMA Effective February 2007 As Revised February 2009