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Home My WebLink AboutDrainage ReportPART ONE -EXECUTIVE DESIGN SUMMARY July 30 , 2007 28 18 PLACE, 1300 HARVEY MITCHELL PARKWAY DATE OF SUBMITTAL 7/30/07 SECTION ONE NAME OF PROJECT 2818 Place -Phase I ADDRESS 1450 Harvey MitchellParkway LEGAL DESCRIPTION Ll Bl 2818 Place Subdivision APPLICANT/PROJECT MANAGER'S INFORMATION (Primary Contact for the Project): Name PLACE PROPERTIES, Ryan D. Griffis Street Address 5215 N. O'Connor Boulevard, Suite 200 City Irving State Texas Zip Code 75039 Phone Number 972-868-9193 PROPERTY OWNER'S INFORMATION: Fax Number 972-868-9001 Name Place Acquisitions, LLC Street Address 105 Eisenhower Parkway City Roseland State New Jersey Zip Code 07068 Phone Number 973-403-3167 Fax Number 973-364-2503 ARCHITECT OR ENGINEER'S INFORMATION: Name BURY + PARTNERS, Randall E. Siemon, P.E. Street Address 1001 West Loop South, Suite 200 State Texas Zip Code 77027 E-Mail Address rsiemon@burypartners .com Phone Number 713-212-0011 Fax Number 713-212-0010 City Houston .. PART ONE -EXECUTIVE DESIGN SUMMARY 28 18 PLACE, 1300 HARVEY MITCHELL PARKWAY SECTION 2 July 30, 2007 The proposed development consists of a 43 acre tract on the south side of Harvey Mitchell Parkway, east of the College Station Airport, that is planned to be developed into a 38 building multi-family development targeted for the Texas A&M student population. The project will be executed in 2 phases. Phase One is submitted today and is planned to be open for the 2008/2009 school year. Phase Two will be submitted in time to open for the 2009/2010 school year. This submitted site plan conforms to the zoning boundaries approved by the city Council in 2006. The Phase 2 development may conform to the revised zoning boundaries if approval from the City Council can be obtained in November of 2007. The present zoning/flood plain boundary is the result of interpretation of the Zone A boundary on the Flood Insurance Rate Ma that was included in the re-zoning effort that occurred in 2006. The new zoning boundary will match the studied flood zone and not Change the actual topography of the site witb the areas that will actually be affected by any flood event. The applicant plans to re-apply for a zoning boundary revision as soon as allowable in the ordinance to change the zoning boundary to match the 100 year flood plain boundary determined by an engineering study. The development consists of the Phase One 196 uni ts and the future Phase Two consisting of another 196 apartment units. Preparation of the plans for this phase will be put on hold until the re-zoning issue is resolved with the city council. SECTION 3 The project is located in the White Creek water shed in an area that has not been previously developed. The entire watershed on the south side of Harvey Mitchell Parkway has not been previously studied. The entire site is within the White Creek watershed. The entire site is within the city of College Station Corporate limits. The AO zo ned area is within the un-studied flood plain. A LOMR has been prepared and submitted to FEMA to more accurately define the flood plain extents and the flood way limits. SECTION 4 PART ONE -EXECUTIVE DESIGN SUMMARY July 30, 2007 2818 PLACE, 1300 HAR VEY MITCHELL PARKWAY The entire site is characterized by steep slopes and deep creek ravins. The area within the studied flood plain boundary is not intended to be developed in accordance with the zoning regulations. A comprehensive report studying the area hydrology and hydraulics was prepared during early 2007 by Dodson & Associates. This repo1i defies the actual , existing flood plain extents. The site is not developed and does not contain any drainage easements. The site is bounded on the south by an existing, 1 O" diameter, 2 foot burial depth petroleum pipeline. Contacts with the pipeline owner have determined that the pipeline is in use. Special grading and paving criteria have been made to allow development adjacent to the pipeline. Runoff from the tract to the east flows through well developed and deeply cut, clay bottom creek beds. Runoff from the tract to the south does not flow onto the site. Runoff from the area on the north side of FM 2818 flows onto the site through 2 existing culverts that run under FM 2818 and into existing creek channels on the site. Runoff from the tract to the west of the site does not flow onto the site. SECTION 5 Storm water on the site will be managed by collection roof drainage into a gutter and downspout system at each building. This flow will be routed into the parking lot area. Flows off of the parking lots ( 10 year intensity) will be collected into curb inlets placed at locations to limit the depth to 6", collect runoff and convey it into the creek channel using inlet boxes, storm sewer and stone rip-rap lined swales. One hundred year events will sheet flow from the parking areas to the creek bed via stone rip-rap lined swales. No land will be required to be reclaimed on this project. SECTION 6 A NOi as required by the TCEQ General Permit for Construction Projects will be submitted to the TCEQ at least 2 days before the start of operations on-site. The NOi will also be submitted to the city with the Site Plan Review Application. PART ONE -EXECUTIVE DESIGN SUMMARY July 30, 2007 2818 PLACE, 1300 HAR VEY MITCHELL PARKWAY The work proposed within the areas of the waters of the US will conform to General Permits Numbers 12 (Utilities), 14 (Linear Transportation), and 43 (Storm water management). The March 2007 release of these Nationwide permits are referenced here. Permit 12. Work on site for installation of Utility systems will not disturb more than Y2 acre of area below the high water mark of the creek in the area of each individual crossing. Not more than 500 feet of the length of stream bed below the high water mark of the creek in the area of each indiyidual crossing. In the area where the sanitary sewer or water main crosses the streams, the width of the stream bed below the high water mark is less than 50 feet. The allowable length of disturbance is 435 feet along the length of the stream. In all instances the disturbance will be confined to the area of the easement (30 ' width maximum). The maximum area planned to be disturbed is less than 0.07 acres (100' wide and 30' long). Permit 14. Work on site for installation oflinear transportation systems (site private streets) will not disturb more than Yi acre of area below the high water mark of the creek in the area of each individual crossing. Not more than 500 feet of the length of stream bed below the high water mark of the creek in the area of each individual crossing will be disturbed. Permit 41. Work on site for the reshaping of the drainage channel within the easement of the sanitary sewer main will be performed to not reduce the capacity of the channel at the sanitary sewer crossing. Not more than 500 feet of the length of stream bed below the high water mark of the creek in the area the reshaping will occur at the sanitary sewer crossmg. SECTION 7 The executed 26 page technical design summary is attached as required by the City regulations. Also attached are the following documents: 1. Copies of the Corps of Engineers Culvert and parking lot drainage calculations ( pages). 2. One set of construction drawings ( sheets) dated 3. One page technical specifications document dated these attachments consist of the drainage report for this project. I:\70152\003 \exec summary design report.doc SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Start (Page 2.1) Engineering and Design Professionals Information Engineering Firm Name and Address: Jurisdiction 0 Bury+Partners, Inc. City: Bryan 1001 W. Loop South 0 College Station Houston, Texas 70027 Date of Submittal: 07126107 Lead Engineer's Name and Contact lnfo.(phone, e-mail, fax): Other: Randall E. Siemon, P.E. 713-212-00 11 D Supporting Engineering I Consulting Firm(s): Other contacts: Dodson & Associates MattZeve 28 1-440-3787 D Developer I Owner I Applicant Information Developer I Applicant Name and Address: Phone and e-mail: Place Properties 972-868-9193 5215 N O'Connor Boulevard 972-868-9001 Irving, Texas 75039 D Property Owner(s) if not Developer I Applicant (&address): Phone and e-mail: Project Identification Development Name: 28 18 Place Phase I Is subject property a site project, a single-phase subd ivisi on, or part of a multi-phase subdivision? Yes If multi-phase, subj ect property is phase 1 of 2 Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B-3a) Lot I Block 1 2818 Place 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. NIA General Location of Project Area, or subject property (phase): South ofHarvey Mitchell Parkway 1300 Harvey Mitchell In City Limits? Extraterritorial Jurisdiction (acreage): Bryan: 0 acres. Bryan: 0 College Station: 0 College Station: 43 acres. Acreage Outside ET J: 0 STORMWATER DESIGN GUIDELINES Effective February 2007 Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or Abutting tracts, platted land, or built subject property: developments: TxDOT Vacant, unplatted Land On 3 sides Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): Unnamed Trib White Creek Brazos Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: 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: R-4/A-O Existing or Proposed? Existing Case Code: Case Date Status: ORD# 2938 Zoning Type: Existing or Proposed? Existing Case Code: Case Date Status: Stormwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s) & Date(s): Participants: 4/2007 Bury+Partners, Inc. Dodson & Assocaites Preliminary Report Required? No Submittal Date Review Date Review Comments Addressed? Yes D No D In Writing? No When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Continued {page 2.3) Coordination For Project or Subject Property (or Phase) Note: For any Coordination of stormwater matters indicated below, attach documentation describing and substantiating any agreements, understandings, contracts, or approvals. Coordination Dept. Contact: Date: Subject: With Other NONE Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non-jurisdiction City Needed? Yes _CJ_ No JZl Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes c:::J. No r:::J Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? Yes _D_ Nol _ I Coordination with Summarize need(s) & actions taken (include contacts & dates): T AMUS Needed? Yes .D.No _D 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 NIA No l21_ Yes D US Environmental Protection Agency No III Yes O NIA Texas Commission on Environmental Quality No r::l_ Yes J::Zl NIA Brazos River Authority No r::1_ Yes D NIA STORMWATER DESIGN GUIDELINES Effective February 2007 Status of Actions (include dates) Areas in Jursdictional waters disturbed less than 300 feet and 1/2 acre NOi and SWPPP prepared Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D-TECHNICAL DESIGN SUMMARY Part 3 -ProQerty Characteristics I Start (Page 3.1) Nature and Scope of Proposed.Work Existing: Land proposed for development currently used, including extent of impervious cover? Site L . I Redevelopment of one platted lot, or two or more adjoining platted lots. Development LJJ Building on a single platted lot of undeveloped land. Project l . J Building on two or more platted adjoining lots of undeveloped land. (select all I m m J 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). L _J Other (explain): Subdivision LL I Construction of streets and utilities to serve one or more platted lots. Development L J Construction of streets and utilities to serve one or more proposed lots on Project lands represented by pending plats. Site projects: building use(s), approximate floor space, impervious cover ratio. Describe Subdivisions: number of lots by general type of use, linear feet of streets and Nature and drainage easements or ROW. Size of 16 Buildings~ squrefoot total floor space Pro~osed 2 Z't) S-b Project . Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? ,,,_.No I J Yes " FEMA ~loodplains " Is any part of subject property abutting a Named Regulatory Watercourse I No I" I Yes D (Section II, Paragraph B 1) or a tributary thereof? Is any part of subject property in floodplain INo O Yes l "l Rate Map 4804ICOI81+~ area of a FEMA-regulated watercourse? Encroachment(s) Encroachment purpose(s): I. J Building site(s) I .. J Road crossing(s) into Floodplain areas planned? I. J Utility crossing(s) I J Other (explain): No D Yes lrn J If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA- approved Flood Study to define allowable encroachments in proposed areas? Explain. See Dodson & Associates revised report dated 6/18/07 /j/U~ STORMWATER DESIGN GUIDELINES Effective February 2007 Page 6 of 26 lf(J/2-{L zoo 7 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -ProQertv Characteristics I Continued (Page 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic analysis been done for larger area including subject property? Yes Reference the study (&date) here, and attach copy if not already in City files. Cl Is the stormwater management plan for the property in substantial conformance with the earlier study? Yes CJ No D 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. JIL 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. See timing analysis in the 4/07 Dodson report Do existing topographic features on subject property store or detain runoff? J::Z:L No I .J Yes Describe them (include approximate size, volume, outfall, model, etc). Any known drainage or flooding problems in areas near subject property? CZJ No c::!I 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) I .I Detention is required. [ __ I Need must be evaluated. I ; . I Detention not required. What decision has been reached? Bv whom? Dodson & Associates If the need for Type 1 Detention How was determination made? must be evaluated: Hydro-Graph timing analysis STORMWATER DESIGN GUIDELINES Effective February 2007 Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ---- SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Pro~ertv Characteristics I Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) Does subject property straddle a Watershed or Basin divide? I "I No I = 1 Yes If yes, describe splits below. In Part 4 describe design concept 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? l. J No I .-J Yes Size(s) of area(s) in acres: 1) BPH 76.8 2) BP2 12.8 3) BPI 76.8 4) BP 3 19.b Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), small creek (non-regulatory), regulatory Watercourse or tributary); See Dodson Report All have curve # 86 Flow determination: Outline hydrologic methods and assumptions: HEC-HMS MUSK-CUNGE-8 POINT SUB CRITICAL (6/07 REV.) Does storm runoff drain from public easements or ROW onto or across subject property? I rn .• J No t " J Yes If yes, describe facilities in easement or ROW: :/:.Culverts under F.M. 2818 Drain BP4+BP2 Are chanaes in runoff characteristics subject to chanae in future? Explain No areas fully developed Conveyance Pathways (Section II, Paragraph C2) Must runoff from study propertl drat across loler lroperties before reaching a Regulatory Watercourse or tributary? . -" · No . _. Yes Describe length and characteristics of each conveyance pathway(s). Include ownership of property(ies ). White Creek water shed Texas A& M property STORMWATER DESIGN GUIDELINES Effective February 2007 Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -ProRert~ 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? J __ j plat, or easements '-I instrument. If instrument(s), describe their provisions. exist for any part of pathway(s)? Lr .H No I ..... I Yes Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired?) Pathway Existing White Creek and undeveloped land Areas See Dodson Report Describe any bui lt or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). None Nearby Drainage Do any of these have r ydryiogic or hydraulic influence on proposed stormwater Facilities design? L -1 I No __ Yes If yes, explain : STORMWATER DESIGN GUIDELINES Effective February 2007 Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Start (Page 4.1) Stormwater Management Concept Discharge(s) From Upland Area(s) If runoff is to be received from upland areas, what design drainage features will be used to accommodate it and insure it is not blocked by future development? Describe for each area, flow section, or discharge point. Culverts under planned streets existing stream beds not disturbed Discharge(s) To Lower Property(ies) (Section II, Paragraph E1) Does project include drainage features (existing or future) proposed to become public via platting? cz:l No r:::J Yes Separate Instrument? CZJ No CJ Yes Per Guidelines reference above, how will r=:I Establishing Easements (Scenario 1) runoff be discharged to neighboring property(ies )? I ; i Pre-development Release (Scenario 2) c::i Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit # ) Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated , etc.). (Attached Exhibit# ) Parking Lot Detention See App. A of 4/07 Dodson report for Hydro logic impacts analysis 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 .c.ombination ~re to be used, has pr0 sed design be~n coordin~ted with owner(s) of receiving property(1es)? c:I No _-_ Yes Explain and provide documentation. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 10 of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ ? • SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters J Continued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi-Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result in shifting runoff between Basins or between r--W-h_a_t -de-s-ig_n_a-nd-m-it-ig_a_t-io-n-is-u-se-d-to_c_o_m_p_e_n_s_a_te_f_o_r _in-c-re_a_s_e_d_r_u_no_ff_-----1 Watersheds? from gaining basin or watershed? L..-J No •-=·Yes How will runoff from Project 1. L. J With facility(ies) involving other development projects. Area be mitigated to pre-2. I . J Establishing features to serve overall Project Area. development conditions? Select any or all of 1, 2, 3. Im.-i 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 Project Area (type & location of facilities): (Attached Exhibit# ) 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. C'· -0 Q) (/) § :e ro ~D c Ol ·u; Q) 0 Oz fol Are aquatic echosystems proposed? t:t.] No Cl Yes In which phase(s) or project(s)? Parking Lot Detention Are other Best Management Practices for reducing stormwater pollutants proposed? D No WJ Yes Summarize type of BMP and extent of use: Rip Rap & grass strips in flood plain area per B-CS specs If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain in later questions. D Detention elements l i Conduit elements CJ Channel features Cl Swales t mJ Ditches L m ii Inlets I .. I Valley gutters L I Outfalls CJ Culvert features CJ Bridges _______ Other STORMWATER DESIGN GUIDELINES Effective February 2007 Page 11 of26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage 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)? I --~' No LL 11 Yes Identify type and general size and In which phase(s). 2 Culvert systems under proposed Phase I streets see site plans designed for zero rise ( 100 year) 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): NIA Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is dr i:f in substantial conformance with earlier analysis and report for larger area? I i Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? I Surfaces? 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? D Yes Cl No, then explain: At intersections or otherwise, do valley gutters cross arterial or collector streets? c::J No I i Yes If yes explain: Are valley gutters proposed to cross any street away from an intersection? c:::J No c::J Yes Explain: (number of locations?) STORMWATER DESIGN GUIDELINES Effective February 2007 Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes: Least .005 Ft/Ft Usual .03 Greatest .05 Ft/Ft Are inlets recessed on arterial and collector streets? r::J Yes Ll I No If "no", identify where and why. All curb inlets flush in parking areas Will inlets capture 10-year djsi:r stormflow to prevent flooding of intersections (arterial with arterial or collector)? ~ Yes Inn ;I No If no, explain where and why not. Will inlet size and placement prevent exceetn) allowable water spread for 10-year design storm throughout site (or phase)? __ Yes I ' I No If no, explain. I 00 year sheet flow to creek -c-c -0 ca ~ Sag curves: Are inlets placed at low points? r::J Yes L I No Are inlets and ~ :§ conduit sized !2.£_revent 100-year stormflow from ponding at greater than 24 inches? ~ g CJ Yes _l:=t_._ No Explain "no" answers. ~1 NIA I Et-----------~ Will 100-yr stormflow be contained in combination of ROW and buried conduit on ~ ce. whole length of all streets? L;J Yes I I No If no, describe where and why. C'-· -0 Q) (/) (/) Q) ::I>-E i BI (/) NIA Do designs for curb, gutter, and inlets comply with B-CS Technical Specifications? c::z::J Yes CJ No If not, describe difference(s) and attach justification. Are any 12-inch laterals used? r::z:J No L _J Yes Identify length(s) and where used. Pipe runs between system I Typical Longest access points (feet): ----- Are junction boxes used at each bend? CJ Yes CJ No and why. NIA If not, explain where .!: 0 -o_;a,t--~~~~~~~~~~--r-~~~~~--, (/) Are downstream soffits at or below upstream soffits? Least amount that hydraulic .!!!. Yes LJ No I _ I If not, explain where and why: grade line is below gutter line (system-wide): NIA STORMWATER DESIGN GUIDELINES Effective February 2007 Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX . APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) -Describe watercourse(s), or system(s) receiving system discharge(s) below en (include design discharge velocity, and angle between converging flow lines). Q) (.) c 1) Watercourse (or system), velocity, and angle? ro (ii c Rip-Rap (Stone) & Sheet flow to exist channel Q) L.. -o al E 2) Watercourse (or system), velocity, and angle? ::J L.. c 0 ·---c . 0 .E ~.~ -E a> ~ a> E 3) Watercourse (or system), velocity, and angle? -ro ]! ~en -en a> ::J c 32 0 ·-> ~ 0 'O a. E-For each outfall above, what measures are taken to prevent erosion or scou r of L.. Q) 0 Q) receiving and all facilities at juncture? -.r:. (f) en Q) 1 )$tone Rip Rap n; L.. ro 0.. 2) Q) en c 3) .£, Are swale(s) situated along property lines between properties? I .-j No CJ Yes Number of instances: For each instance answer the following questions. Surface treatments (includinQ low-flow flumes if any): C'-· en -Q) ~ en -Q) Flow line slopes (minimum and maximum): en >- !01 al 0 en Z Outfall characteristics for each (velocity, convergent angle, & end treatment). ::J iol en Q) L.. Will 100-year design storm runoff be contained within easement(s) or platted drainage ~ ROW in all instances? I " I Yes I J No If "no" explain: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) (/) Are roadside ditches used? I ' :I No c:::I Yes If so, provide the following: <l> Is 25-year flow contained with 6 inches of freeboard throughout? I -I Yes c:::I No .!:: .B Are top of banks separated from road shoulders 2 feet or more? I . J Yes c:::l No 0 Are all ditch sections trapezoidal and at least 1.5 feet deep? '-t Yes c:::i No <l> "O For any "no" answers provide location(s) and explain: ·u; "O ct1 0 er: If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: (/) <l> Sheet Flow to exist creek >- I -Is 100-year design flow contained in conduiUswale combination? I I Yes I I No Lil ~ If "no" explain: c 0 ct1 ROW CJ Easement C:=J z iii Space for 100-year storm flow? Width -9~ Swale Surface type, minimum Conduit Type and size, minimum and maximum ct1 c and maximum slopes: slopes, design storm: C'-· ~ (/) "O Qi "O ct1 c >. Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c ct1 c .!:: ct1 (.) L.. c .£ <l> c c. 0 0 ~ Access Describe how maintenance access is provided (to swale, into conduit): -ct1 0 E ::J L.. -~ .£ c c <l> "O E Instance 2 Describe general location, approximate length: <l> ct1 (/) (/) ::J (/) <l> c "O 0 ·::; Is 100-year design flow contained in conduiUswale combination? I I Yes l _;;J No ~ 0 L.. If "no" explain: c c. :c -<l> E <l> ROW CJ Easement r=::I 0 .!:: Space for 100-year storm flow? Width (.) (/) -<l> Swale Surface type, minimum Conduit Type and size, minimum and maximum ::J -ct1 "O L.. and maximum slopes: slopes, design storm: c ct1 0 c. (.) <l> --(/) Describe how conduit is loaded (from streets/storm drains, inlets by type): <l> Inlets <ii c 3: ~ (/) <l> L.. <( 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 ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.7) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) c ·ro a. E x gw If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surtacing: 15 en Is 100-year design flow contained in swale? t I Yes c:J No Is swale wholly c ~ within drainage ROW? t Ji Yes Cll No Explain "no" answers: .;01 !----------------~ ~ Access Describe how maintenance access is provide: ..... 0 1 ~1 ~ln-s-ta_n_c_e_2~-D-e-s-cr-ib_e_g_e_n_e_r-al-l-oc_a_t-io-n-.-a-pp_r_o_x1-.m-a-te~le_n_g-th-.-s-u_rt_a_ci_n_g_:~~~~~---1 Q) ·;:: C'-· ::J en .0 c -Q) i:5 E ~ Q) -en -~ ~ ~ 0 C\l s: ~ 0 0::: ~ .!:2 :a ::J a. Is 100-year design flow contained in swale? c:J Yes c:J No Is swale wholly within drainage ROW? c:J Yes c::ll 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? r=I No D Yes If only slightly C'-· shaped, see "Swales" in this Part. If creating side banks, provide information below. "C c 1--~~~~~~~~~~~~~--===~~--===~~~~~~~~~~~--j 3l ro Will design replicate natural channel? t::J Yes r=I No If "no", for each instance ~ ~ describe section shape & area, flow line slope (min. & max.), surtaces, and 100-year a. w design flow, and amount of freeboard: 2 ~ Instance 1: 101 a. Instance 2: -~ ~ 1 EJI Instance 3: () STORMWATER DESIGN GUIDELINES Effective February 2007 Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels {small creeks}: Are these used? t::2:J No •--__ ! Yes If "yes" provide the information below. Will small creeks and their floodplains remain undisturbed? L. _J Yes I I 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. -'O a> :::J c ~ Watercourses {and tributaries): Aside from fringe changes, are Regulatory 0 Watercourses proposed to be altered? I 'J No I -J Yes Explain below. ~ (/) -Submit full report describing proposed changes to Regulatory Watercourses. Address c a> existing and proposed section size and shape, surfaces, alignment, flow line changes, E a> length affected, and capacity, and provide full documentation of analysis procedures > 0 and data. Is full report submitted? c::J Yes I A No If "no" explain: L.. c. E Qi c c ro All Proposed Channel Work: For all proposed channel work, provide information .c () 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. Will 100-year flow be contained with one foot of freeboard? I 1 Yes I . J No If not, identify location and explain: Are ROW I easements sized to contain channel and required maintenance space? c::J Yes I J No If not, identify location(s) and explain: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j 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: _ 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? CJ yes I I no D yes I . I no Berms 6 inches above plugged WSE? D yes I 1 no 1.-... J yes L J no ). Explain any "no" answers: - en a Q) >- Dl·j 0 ~ For each facility what is 25-yr design Q, and design of outlet structure? Facility 1: z () Bl~ Facility 2: Do outlets and spillways discharge into a public facility in easement or ROW? C'-· a Facility 1: CJ_ Yes J::l No Facility 2: r::1 Yes J::l No "O ..J Q) If "no" explain: en 0 ~\ 0.. 0 .... ·;z a.. ~ ~ For each, what is velocity of 25-yr design discharge at outlet? & at sgillway? '5 ~ Facility 1: & Facility 2: & ro -Are energy dissipation measures used? _D_No r::J Yes Describe type and u_ .I"" c • i-location: 0 >. :;:; c Q) I'< a; c.: 0 Q) v .... ~ For each, is spillway surface treatment other than concrete? Yes or no, and describe: < Facility 1: --Ci -......J 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 ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Do structures comply with 8-CS Specifications? Yes or no, and explain if "no": (/) Facility 1; ~ =:c g (!) Facility 2: u. :J c c;; 0 c :;::; 0 c () (!) -Qi For additional facilities provide all same information on a separate sheet. 0 Are parking areas to be used for detention? I. J No L .J Yes What is maximum depth due to required design storm? Roadside Ditches: Will culverts serve access driveways at roadside ditches? c::JNo 12J Yes If "yes", provide information in next two boxes. Will 25-yr. flow pass without flowing over driveway in all cases? ~Yes .W. No Without causing flowing or standing water on public roadway? JZL Yes Q No Designs & materials comply with 8-CS Technical Specifications? J::zl Yes L J No Explain any "no" answers: C'-· (/) Cl c ·u; Are culverts parallel to public roadway alignment? I l j Yes _c::::t No Explain: (/) 0 L. (/) () 2~ !Bl Creeks at Private Drives: Do private driveways, drives, or streets cross drainage CCI w;:s rat serve Above-Project areas or are in public easements/ ROW? -0 0 __ No CZ I Yes If "yes" provide information below. (!) z ]01 How many instances? 2 Describe location and provide information below. (!) Location 1: NE Culvert 2 12x6 Main Channel ~ :J () (!) Location 2: Tributary 3 1 6x3 L. <( Location 3: Entrance Drive 24" RCP. For each location enter value for: 1 2 3 Design year passing without toping travelway? 100 100 100 Water depth on travelway at 25-year flow? Water depth on travelway at 100-year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulatort Watercourses (& Tributaries}: Are culverts proposed on these facilities? I . . jl No L. ......... ! Yes, then provide full report documenting assumptions, crit~ria, analysis, compu~er p~ograms, and studJlfindings.,th~t supp~rt proposed des1gn(s). Is report provided . J::j_ Yes _~_·_No If no , explain: -Arterial or Major Collector Streets: Will culverts serve these types of roadways? Q) Q) L J No L.J Yes How many instances? For each identify the ..c: en Q) location and provide the information below. -en ro Instance 1: Q) ..... >-~ DI~ Instance 2: Instance 3: c .Q Yes or No for the 100-year design flow: \I. 0 co 1 2 3 ~I ~ Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? ~ E C'· Cll Is velocity limited per conditions (Table C-11 )? en en g'-o Explain any "no" answer(s): ·-c l:l Cll 0 c ] ..... 0 () +:i >. Cll Cll (.) 3: _Q "O Q) ~ Cll ..a Minor Collector or Local Streets: Will culverts serve these types of streets? 0 --.......... (.) (.) CJ No J::l Yes How many instances? for each identify the ·-en -Q) !CS: -§ "O location and provide the information below: a. Q) -a. Instance 1: I Cll$ "C >. Instance 2: Q) c en Cll :J ..... Instance 3: en o -~ en > Q) For each instance enter value, or "yes" I "no" for: 1 2 3 -(.) :J c ,_us Design yr. headwater WSE 1 ft. below curb top? No No No Q.l en ~ ..... c <( ·-100-yr. max. depth at street crown 2 feet or less? No No No Q) ..... 0 Product of velocity (fps) & depth at crown (ft)=? No No No E ..... g Is velocity limited per conditions (Table C-11 )? No No No Limit of down stream analysis (feet)? No No No Explain any "no" answers: STORMWATER DESIGN GUIDELINES Effective February 2007 Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continu ed (Page 4. 12) Stormwater Management Concept (continued) Within Or Serv ing Subject Property (Phase, or Site) (continued) All P ro~osed 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 ~ Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? "O Q) ::i No Yes If "yes" identify location(s), describe outfall design treatment(s): c ---- ~ 0 () (/) t Q) 2! ::i Is scour/erosion protection provided to ensure long term stability of culvert structural 0 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 fu ll y contained in street ROW, and/or drainage easements/ ROW? __ Yes --No if not, why not? Do appreciable hydraulic effects of any cu lvert extend downstream or upstream to neighboring land(s) not encompassed in subject property? --No --Yes If "yes" describe location(s) and mitigati on measures Are all culvert designs and materials in compliance with B-C S Tech. Specifications? --Yes --No If not, expla in in Special Design Section of th is Part. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 21 of 26 APPENDIX. D TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D-TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceRt 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? L_:I No r:: I Yes If "yes" provide the following information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? Ci) Q) Ol -0 ·;:::: 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? I. I Yes L mJ No If "no" explain: Is a Stormwater Provide a general description of planned techniques: £ Pollution Prevention Silt fencing and maintenance -ro Plan (SW3P) :::i a established for .... project construction? Q) (ii CJ No I l J 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? .l:ZJ.No L mJ 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? J::l_ Yes _c:]_ No If "no" explain: NIA STORMWATER DESIGN GUIDELINES Effective February 2007 Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Special Designs -Deviation From B-CS Technical Specifications If any design(s) or material(s) of traditional runoff-handling facilities deviate from provisions of B-CS Teclinical Specifications, check type facility(ies) and explain by specific detail element. I . J Detention elements _.D._ Drain system elements L. i Channel features _r::]_ Culvert features r::::JL Swales r::::JL Ditches r::::l_ Inlets DI.outfalls r::l Valley gutters _.D_ 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) None 2) 3) 4) 5) Have elements been coordinated with the City Engineer or her/his designee? For each item above provide "yes" or "no", action date, and staff name: 1) 2) 3) 4) 5) Design Parameters Hydrology Is a map(s) showing all Design Drainage Areas provided? l2J Yes CJ No Briefly summarize the range of applications made of the Rational Formula: Used TP-40 rainfall data of Brazos County to calculate rainfall intensity for 10 yr., 25 yr. and JOO yr. storm events at initial TC=IOmin. "C" factor of#; per unified Stormwater Design Guideline, sec. ix table C-2 0-~' What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 2.14 acres STORMWATER DESIGN GUIDELINES Effective February 2007 Location (or identifier): @ southeast comer of drainage area map Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce12t and Design Parameters / Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making determinations for time of concentration, was segment analysis used? l2J No Lj Yes In approximately what percent of Design Drainage Areas? NIA % As to intensity-duration-frequency and rain depth criteria for determining runoff flows, were any criteria other than those provided in these Guidelines used? __(2J_ No Q 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 10 Storm drain system for local streets -- Open channels -- Swale/buried conduit combination in lieu of channel -- Swales 25 25 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 100 100 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) -10.00 5.93 -- Lowest (feet per second) -4.14 2.29 -- Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For conduit type(s) HDPE STORMWATER DESIGN GUIDELINES Effective February 2007 For street gutters: RCP Page 24 of 26 NIA Coefficients: 0.008 0.013 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ____ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters j Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street and Storm Drain Systems (continued) For the following , are assumptions other than allowable per Guidelines? Inlet coefficients? I l_ I No I .. J Yes Head and friction losses IZ .I No I .. J Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? l2J Yes CJ No Are elevation drops provided at inlets, manholes, and junction boxes? tZJ Yes L mJ NO Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? L2 I Yes I i No For 100-year flow conditions? .J:Z]Yes L )No Explain any "no" answers: What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: The tailwater elevation is taken account for at every outfall location per the approved Floodplain report. Open Channels If a HEC analysis is utilized, does it follow Sec Vl.F.5.a? r:::l Yes _r=I No Outside of straight sections, is flow regime within limits of sub-critical flow? m Yes I I No If "no" list locations and explain: 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? See Attached Culvert Computations Entrance, friction and exit losses: See Attached Culvert Computations Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Effective February 2007 Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software has been used in the analysis and assessment of stormwater management needs and/or the development of facility designs proposed for subject property project? List them below, being sure to identify the software name and version, the date of the version, any applicable patches and the publisher -Company excel spreadsheet for pip there calculation -Bentley flowmaster and culvertmaster service pack 3, 2005 for inlet/culverts calculations 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: Attestation State of Texas PE No. 7 J,(O 7 ------- STORMWATER DESIGN GUIDELINES Effective February 2007 Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised ___ _ Culvert Calculator Report Cross Section 7995 (NE-mainstream) ,._ Input Data is Base on the Approved "Floodplain Analysis Report for a Proposed Student Housing Complex and Letter of Map Revision Request" Dated June 2007, Prepared by Dodson & Associated, Inc. Culvert Summary Allowable HW Elevation 300.62 ft Headwater Depth/Height 1.16 (Upstream 100-YR WSE) Computed Headwater 300.62 ft Discharge 't-329.34 cfs Elevation Inlet Control HW Elev. 300.49 ft Tailwater Elevation ~00.49 ft (Downstream 100-YR WSE) Outlet Control HW Elev. 300.62 ft Control Type Outlet Control Grades Upstream Invert 293.64 ft Downstream Invert 293.26 ft Length 54.00 ft Constructed Slope 0.007037 ft/ft Hydraulic Profile Profile Pressure Depth, Downstream 7.23 ft Profile Slope Type N/A Normal Depth 1.21 ft Flow Regime N/A Critical Depth 1.80 ft Velocity Downstream 2.29 ft/s Critical Slope 0.002056 ft/ft Section Section Shape Box Mannings Coefficient 0.011 Section Material Concrete Span 12.00 ft Section Size 12x6ft Rise 6.00 ft Number Sections 2 Outlet Control Properties Outlet Control HW Elev. 300.62 ft Upstream Velocity Head 0.08 ft Ke 0.50 Entrance Loss 0.04 ft Inlet Control Properties Inlet Control HW Elev. 300.49 ft Flow Control Unsubmerged Inlet Type go• Area Full 144.0 ft2 Headwall K 0.51000 HOS 5 Chart 9 M 0.66700 HOS 5 Scale 1 c 0.03090 Equation Form 2 y 0.80000 Title: Student Housing Complex Project Engineer: vnguyen j:\70152\001\culvert comps\rev-ne-x-sections.cvm Bury & PartnersHouston CulvertMaster v3.1 [03.01 .010.00] 712512007 7:07:41 PM c Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1 -203-755-1666 Page 1 Culvert Calculator Report Cross Section 272 (SE) Tributary 3 f-Input Data is Base on the Approved "Floodplain Analysis Report for a Proposed Student Housing Complex and Letter of Map Revision Request" Dated June 2007, Prepared by Dodson & Associated, Inc. Culvert Summary Allowable HW Elevation 303.93 ft Headwater Depth/Height 1.33 (Upstream 100-YR WSE) Computed Headwater 303.52 ft Di scharge (100-YR) iJl..1 06.75 cfs Elevation Inlet Control HW Elev. 303.02 ft Tailwater Elevation * 302.64 ft (Downstream 100-YR WSE) Outlet Control HW Elev. 303.52 ft Control Type Outlet Control Grades Upstream Invert 299.54 ft Downstream Invert 298.85 ft Length 41 .00 ft Constructed Slope 0.017250 fUft Hydraulic Profile Profile Pressure Depth, Downstream 3.79 ft Profile Slope Type N/A Normal Depth 1.14 ft Flow Regime N/A Critical Depth 2.14 ft Velocity Downstream 5.93 fUs Critical Slope 0.002806 fUft Section Section Shape Box Mannings Coefficient 0.011 Section Material Concrete Span 6.00 ft Section Size 6 x 3 ft Rise 3.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 303.52 ft Upstream Velocity Head 0.55 ft Ke 0.50 Entrance Loss 0.27 ft Inlet Control Properties Inlet Control HW Elev. 303.02 ft Flow Control N/A Inlet Type goo Area Full 18.0 ft2 Headwall K 0.51000 HOS 5 Chart 9 M 0.66700 HOS 5 Scale c 0.03090 Equation Form 2 y 0.80000 Title: Student Housing Complex Project Engineer: vnguyen j:\70152\001\culvert comps\rev-ne-x-sections.cvm Bury & PartnersHouston CulvertMaster v3.1 (03.01 .010.00] 7/25/2007 7:08:18 PM c Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 Culvert Calculator Report @Entrance to F.M 2818 Solve For: 25-YR Headwater Elevation &~ Culvert Summary l "l Allowable HW Elevation 310.40 ft Headwater Depth/Height 0.64 f AGG Computed Headwater 310.28 ft Discharge~ 4.35 cfs Elevation Inlet Control HW Elev. 310.20 ft Tailwater Elevation 310.20 ft (Top of Downstream Pipe) Outlet Control HW Elev. 310.28 ft Control Type Outlet Control Grades Upstream Invert 309.00 ft Downstream Invert 308.20 ft Length 80.00 ft Constructed Slope 0.010000 ft/ft Hydraulic Profile Profile S1 Depth, Downstream 2.00 ft Slope Type Steep Normal Depth 0.59 ft Flow Regime Subcritical Critical Depth 0.73 ft Velocity Downstream 1.38 ft/s Critical Slope 0.004506 ft/ft Section Section Shape Circular Mannings Coefficient 0.013 Section Material Concrete Span 2.00 ft Section Size 24 inch Rise 2.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 310.28 ft Upstream Velocity Head 0.08 ft Ke 0.20 Entrance Loss 0.02 ft Inlet Control Properties Inlet Control HW Elev. 310.20 ft Flow Control Unsubmerged Inlet Type Groove end Area Full 3.1 ft2 projecting K 0.00450 HOS 5 Chart M 2.00000 HOS 5 Scale 3 c 0.03170 Equation Form y 0.69000 Title: Student Housing Complex Project Engineer: vnguyen j:\70152\001\culvert comps\rev-ne-x-sections.cvm Bury & PartnersHouston CulvertMaster v3.1 [03.01 .010.00] 7/25/2007 6:49:54 PM c Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 Culvert Calculator Report @Entrance to F.M 2818 Solve For: 100-YR Headwater Elevation Culvert Summary Allowable HW Elevation 310.40 ft Headwater Depth/Height 0.66 Computed Headwater 310.32 ft Discharge (100-YR) 5.14 cfs Elevation Inlet Control HW Elev. 310.20 ft Tailwater Elevation 310.20 ft (Top of Downstream Pipe) Outlet Control HW Elev. 310.32 ft Control Type Outlet Control Grades Upstream Invert 309.00 ft Downstream Invert 308.20 ft Length 80.00 ft Constructed Slope 0.010000 ft/ft Hydraulic Profile Profile S1 Depth , Downstream 2.00 ft Slope Type Steep Normal Depth 0.65 ft Flow Regime Subcritical Critical Depth 0.80 ft Velocity Downstream 1.64 ft/s Critical Slope 0.004565 ft/ft Section Section Shape Circular Mannings Coefficient 0.013 Section Material Concrete Span 2.00 ft Section Size 24 inch Rise 2.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 31 0.32 ft Upstream Velocity Head 0.11 ft Ke 0.20 Entrance Loss 0.02 ft Inlet Control Properties Inlet Control HW Elev. 310.20 ft Flow Control Unsubmerged Inlet Type Groove end Area Full 3.1 ft2 projecting K 0.00450 HOS 5 Chart 1 M 2.00000 HOS 5 Scale 3 c 0.03170 Equation Form y 0.69000 Title: Student Housing Complex Project Engineer: vnguyen j:\70152\001\culvert comps\rev-ne-x-sections.cvm Bury & PartnersHouston CulvertMaster v3.1 (03.01 .010.00) 7/25/2007 6:49:15 PM c Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 Fo/l crrr ()5 iY t?Nt Y a ~= TCEQ Office Use Only Notice of Intent (NOi) for Storm Water ~ ~ Pennit No . -~ Discharges Associated with Construction RN : ...-.. Activity under TPDES General Permit CN: TCEQ (TXR150000) ~ Sign up now fo1· on line NOi at http://www.tceq.state.tx.us/pennittinglstee!'s/steel's.html Get Instant Approval Did you know you can pay on line? Go to https://www6. tceq.state. tx.us/epay/ Select Fee :rype: GENERAL PERMIT CONSTRUCTION STORM WATER DISCHARGE NOi APPLICATION Application Fee: You must pay the $100 Application Fee to TCEQ for the application to be considered complete. How did you pay this fee? Maited:D Check/Money Order No.: Name Printed on Check: EPAY: D Voucher No.: Is the Payment Voucher copy attached? 0 Yes IMPORTANT: •Use the attached I STRUCTIONS when completing thi s form . •After completing this form, use the attached CUSTOMER CHECKLIST to make certain all items are complete and accurate. •Missing, illegible, or inaccurate items may delay final acknowledgment or coverage under the general permit. A. OPERATOR (applicant) PLA-c~ /} /2-() fJ~/l17 c cs l. If tlie applicant is currently a customer with TCEQ, what is the Customer Number (CN) issued to this entity? CN 2. What is the full Legal Name of the applicant? (J'he legal name must be spelled exactly as filed with the Texas Secretary of State, County, or in the legal document fom1ing the entity.) 3. What is the applicant's mailing address as recognized by the US Postal Se!'vice? Address: 5 2-f ) N OCON/VOil I Suite No./Bldg. No./Mai l Code: #;?.CO City: f /lUt/V'o I State: 7X I ZIP Code: ? )0 '57 Country Mailing Information (if outside USA). Country Code: Postal Code: 4. Phone No.: «(7 Zl '?C/j-'! l'l' _J Extension: S. Fax No.: <crrz) 8'6tf 9t?O/ E-mail Address: 6. Indicate the type of Customer: ~lnd;v;dual Dso!e Proprietorship-D.BA D Limited Partnership Corporation D Federal Government 0General Partnership State Government O county Government Deity Government Dother:. 7. Independent Operator: ~Yes D No (If governmental entity, subsidiary, or part of a larger corporation, check "No".) 8. Number of Employees: l:J 0-20; Psi_21-100; bJ I 01-250; l:J 25 1-500; or l:J SO I or higher 9. Customer Business Tax and Filing Numbers (J'his item is not applicable lo Individuals, Government, GP or Sole Proprietor.) REQUIRED for Corporations and Limited Partnerships State Franchise Tax ID Number: Federal Tax ID: TX SOS Charter (filing) Number: DUNS Number (if known): B. BILLING ADDRESS The Operator is responsible fo r paying the annual fee . The annual fee will be assessed to permits active on September 1 of each year. TCEQ will send a bill to the address provided in this section. The Operator is respoqsible fo r terminating the permit when it is no longer needed. Is the billing address same as the Operator Address? JJ:sf!es. go to Section C. O No. fill out Section B 1. Bi lling Mailing Address: I Suite No./Bldg. No./Mai l Code: City: I State: I ZIP Code: 2. Country Mailing In formation (if outside US A). Territory: Count1y Code: Postal Code: 3. Billi ng Contact (Attn or C/0): 4. Phone No.: ( ) Extension: S. Fax No.: ( ) E-mail Address: TC EQ-20022 ( 12/0 I /2006) Page I C. APPLICATION CONTACT lfTCEQ needs additional information regarding this application, who should be contacted? I. Name fl ( !::;>/ C°f-!OI\/ j Title: ENC wt cC fl j Company /J(,}(2 l T /.Wl!/V&-/2~ 2. Phone No. (7( 3 ) 21?-001( Extension: 3. Fax No.: '713-7 (2-0010 E-mail Address: £ SttflOtV@ tf v,t, f I /fl217V¥#-5t CC)~ D. REGULATED ENTITY (RE) INFORMATION ON PROJECT OR SITE I. TCEQ Issued RE Reference Number (RN) (if available): 2. Name of Project or Site (the name as known by the community where thi s fac ility/project is located): poo 2 8 ( s-jJ t-/t-Cc(__ (example: phase and name of subdivision or name of project that's unique to the site) 3. Physical Address of Project or Site: (enter in spaces below) Street Number: /JOO f' f lf(l cJ le;,'(' M ( TCH ~l(., I Street Name: City : Col c ("G ( 5Tlt-noµ/ I ZIP Code: I County (Counties if>!): t:J (C,/J-2/25 4. If no physical address (Street Number & Street Name), provide a written location access description to the site: (Ex.: phase I of Woodland subdivision located 2 miles west from intersection of Hwy 290 & IH35 accessible on Hwy 290 South) ---5. Latitude: '50-'Jc;--L{ c,8( N I Longitude: q6-20-5"'6. V' L- 6. What is the primary busiiless of this entity? In your own words, briefly de scribe the primlry business of the Regulated Entity: (Do not repeat the SIC and NAICS code) M Ul-rt F/fl'l1 ti!' C OIV 5 /f2 UC rw-A./' 7. What is the mailing address and contact information for the regulated entity? ls the RE mailing address the same as the Operator? J2aYes, address is the same as Operator ONo, provide the address Street Number: j StreetName: City: j State: I ZIP Code: '~E. GENERAL cq,~cTERISTICS . > ·{ ·f . " I. I certify that the project/site is not located on Indian Country Lands? ~Yes 0No If No, you must obtain authorization through EPA, Region VI. 2. Is thi s NOi being submitted due to a change in Operator? 0Yes j4No 3. What is the Standard Industrial Classification (SIC) code (see instructions for common codes): Primary: 17~2-Secondary: 4. What is the total number of acres disturbed? I ? 5 I Is the project site part of a larger common plan ~f developm~nt ~; s~le? !1l:tes 0No If Yes, the total number of acres disturbed can be less than 5 acres. If No, the total number of acres disturbed must be 5 or more. If the total number of ac res disturbed is less than 5 then the project site does not qualify for coverage through this Notice of Intent Coverage wi ll be denied. See the requirements in the general permit for small construction sites. 5. Discharge Information a What is the name of the first water body to receive the stonn water runoff or potential runoff from the site?{,() f{ ("{F!' Cllfft'"- b. What is the segment number(s) of the classified water body(s) that the di scharge or potential discharge will eventually reach? c. ls the discharge into an MS4? 0Yes K!)No If Yes, what is the name of the MS4 Operator? Note: The general permit requires you to send a copy of the NOi to the MS4 Operator. 6. Is the discharge or potential discharge within the Recharge Zone, Contributing Zone, or Contributing Zone within the Transition Zone of the Edwards Aquifer? 0 Yes !SQ No If the answer is Yes, please note that a copy of the agency approved Plan required by U1e Edwards Aquifer Rule (30 TAC Chapter 213) must be included in the Stonn Water Pollution Prevention P lan. TCEQ-20022 (1210112006) Page 2 F. CERTIFICATION Check "Yes" to the certifications below. Failure to indicate "Yes" to ALL items may result in denial of coverage under the general permit. I certify th at I have obtai ned a copy and understand the terms and conditions of the general permit TX 150000. I certi fy that the activities at this site quali fy for coverage under the general permit TX 150000. I understand that a Notice of Termination (NOT) must be submitted when this authorization is no longer needed. I understand that permits active on September lst of each year will be assessed an Annual Water Quality Fee. l certify that a Storm Water Pollution Preventi on Plan (SWP3) has been prepared and implemented as required by the general permit. Operator Certification: I, (Required) Title (Required) ~Yes ~Yes ~Yes ~Yes )@ Yes certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the infonnation submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the infonnati on, the infonnation submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware there are significant penalties for submitting fa lse information, including the possibility of fine and imprisonment fo r knowing violations. er 30 Texas Administrative Code §305.44 to sign and submit thi s document, and can provide documentation in TCEQ-20022 ( 12/01/2006) Page 3