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Stormwater Drainage Report
Stormwater Drainage Report for Tower Point Infrastructure Development for Private Drive G & H College Station, Texas Prepared far: Weiner Development Corporation Prepared by: Walter P. Moore & Associates, Inc. 920 Main Street, 10 Floor Kansas City, Missouri 65104 TAPE Firm Registration No. 1856 June 7, 2010 Revised August 2. 2010 Moiviv Revised September 7, 2010 � Of TF or tri J. SHAWN ces NA j , ( p O : at % S iSp ENS ' ! �. , TABLE OF CONTENTS PROFESSIONAL CERTIFICATION 2 EXECUTIVE SUMMARY 3 GENERAL LOCATION AND DESCRIPTION OF PROJECT AREA 4 DRAINAGE WATERSHEDS AND STUDY AREAS 5 DRAINAGE DESIGN CRITERIA 6 COMPLIANCE WITH PROPOSED DEVELOPMENT ASSUMPTIONS 7 DRAINAGE SYSTEM DESIGN 7 CONCLUSION 8 APPENDIX 9 Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 1 PROFESSIONAL CERTIFICATION This report and plans for the drainage design of Tower Point Infrastructure Development project 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 will be issued prior to construction. ■ �1�_ �� • OF . 4 %1 Licen--d Professioninee ��— 7.4 • • ................. • 1** State of Texas No � ............. CEssp q •07 t v toms w ; . Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 2 1 EXECUTIVE SUMMARY Infrastructure improvements are being proposed for future development of the Tower Point Subdivision located at the west corner of the intersection of Highway 6 and Highway 40 in the City of College Station, Texas. These improvements include a storm sewer system to capture stormwater runoff generated from adjacent future development and minimize runoff within the proposed streets. Storm sewer inlets will capture storm water runoff and an underground storm sewer system will convey runoff into Spring Creek located to the west of the development. The existing bridge serving Highway 6 over Spring Creek contains storm water detention control structures to minimize peak runoff rates for this development. As such, no additional storm water detention is anticipated for this project. Previous design information indicates that the control structures at the bridge minimize runoff rates and allow storm water runoff to back up within the Spring Creek tributary during storm events. Storm sewer system components have been designed according to the Unified Stormwater Design Guidelines of the City f College Station based on anticipated future development. StormCAD® b Y g p P by Bentley Systems was utilized to determine peak runoff rates, pipe capacities, hydraulic grade lines throughout the system, and other necessary hydraulic information. The storm sewer system components have been designed to mitigate impacts to the existing downstream storm sewer system and watercourses. No adverse impacts are expected with these improvements. Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 3 i GENERAL LOCATION AND DESCRIPTION OF PROJECT AREA The Tower Point Infrastructure Development project is located within the Tower Point Subdivision. This subdivision is approximately 128 acres and is located at the west corner of the intersection of Highway 6 and Highway 40. The project area is approximately 11.3 acres and for the purposes of this report is the extent of the Drainage Study Area. It is bounded by existing Private Drive C to the north, Highway 40 to the east, Arrington Road to the south and west. Surrounding the project area is undeveloped property to the west and south. Site development construction is currently occurring north of Private Drive C. The land developer for this project is the Weiner Development Corporation and the owner is College Station Marketplace, L.P. The project area is located within the Spring Creek named regulatory watercourse. Spring Creek proceeds into Lick Creek, followed by the Navasota River and then the Brazos River. Beyond the west limits of the project and within the Tower Point Subdivision is a stormwater detention facility located within Spring Creek constructed previously to serve this development. An existing storm sewer system is located along the recently constructed Private Drive C and Arrington Road. No other storm sewer systems currently exist within the project limits. The limits of the infrastructure development portion of this project are bounded by Private Drive C, Highway 40, and Arrington Road. All infrastructure improvements included in this report serve the Tower Point Subdivision plat. All infrastructure improvements are also located within this subdivision. Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 4 ( r This extent of this project includes infrastructure improvements for future site development within the Tower Point Subdivision. Infrastructure improvements include new parking lots and private driveways, storm sewer systems, water supply systems, and sanitary sewer systems. These improvements are designed and constructed to allow future development to occur. Future land development in this project area is expected to be commercial development, particularly retail shops and restaurants. The project area is currently undeveloped and existing land cover consists primarily of rocky soil with minimal vegetation. DRAINAGE WATERSHEDS AND STUDY AREAS The entire project area is within the Spring Creek named regulatory watershed and drains into Spring Creek. A FEMA flood panel map of the project area is located in the Appendix. From aerial photography, it appears the Spring Creek watershed is generally undeveloped at this time. Relatively small portions of the watershed along the northern and southern sides are currently developed as primarily single family residential homes. The land cover of the remaining portions of the watershed is predominately forested with small amounts of agricultural land. Stormwater runoff in the existing undeveloped condition generally flows from east to west across the project site area. The existing right -of -way for Highway 40 represent the limits of the project area to the east and represents the limits of the watershed boundary of storm water runoff that flows onto the project site. As such, no stormwater runoff from other areas flows onto the project site. Stormwater runoff from the project area will be conveyed into existing storm sewer systems located along Private Drive C and along Arrington Road. A high point is located within the proposed Private Drive G. Storm water runoff from approximately the northern one -third of the project is conveyed into the existing storm sewer system located in Private Drive C, and the storm water runoff from the Stormwater Drainage Report Tower Point Infrastructure Development — Private Drive G Page 5 r > remaining approximately southern two - thirds or the project in conveyed into the existing storm sewer system within Arrington Road. Proposed site improvements maintain existing drainage patterns to the extent possible. All stormwater runoff generated from the project area proceeds overland into the proposed storm sewer systems. The proposed storm sewer systems convey the captured runoff into the existing storm sewer systems as mentioned previously. A proposed drainage area map is located in the Appendix that delineates the overall watershed boundaries and the individual drainage boundaries for each proposed storm sewer inlet in the proposed condition. DRAINAGE DESIGN CRITERIA Storm sewer systems have been designed according to the Unified Stormwater Design Guidelines contained within the Site Design Standards manual of the City of Bryan and the City of College Station. All storm sewer inlets and pipes have been designed according to these standards to convey storm water runoff from the anticipated future development within the project area for a 10 year storm event. Inlets have been placed along the roadways to limit gutter flow rates and spreads and allow for future storm sewer connections for individual properties as they become developed within the project area. Runoff rates have been calculated based on future development using conservative runoff coefficients of 0.90 for all areas with minimum times of concentrations of 10 minutes. According to the above referenced Design Guideline, rainfall intensities for the 10 year storm event were calculated using the following equation: i = 80 / (Tc + 8.5)0 763 The 100 year storm event was also calculated to determine the impacts on the storm sewer systems and surrounding development. The rainfall intensity equation used for this storm event was: i = 96 / (Tc + 8.0)0 Sao Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 6 r � COMPLIANCE WITH PROPOSED DEVELOPMENT ASSUMPTIONS As indicated previously, all storm water runoff from the proposed site development is conveyed into the existing storm sewer systems in Private Drive C and Arrington Road. The existing storm water detention controls located at the bridge serving Highway 6 and the existing storm sewer systems took into account for future development. Both the Spring Creek detention control structures and the existing storm sewer system used hydrologic assumptions of the anticipated and development to calculate fully developed peak runoff rates for this project site. The hydrologic assumptions made for the proposed storm sewer system are in compliance with the assumptions made for the existing storm water control structures as well as the existing storm sewer system. These assumptions include using minimum time of concentrations and fully development runoff coefficients. As a result, no additional storm water detention in anticipated for this project and there will be no adverse impacts on the existing storm sewer systems within Private Drive C and Arrington Road. DRAINAGE SYSTEM DESIGN Storm sewer system peak runoff rates and system components were designed using the aid of StormCAD® by Bentley Systems. StormCAD® utilizes the rational method to developed peak runoff rates along with Manning's equation and the Continuity equation to determine pipe sizes, flow rates, head and friction losses, gutter spreads, and hydraulic grade lines throughout the storm sewer system. StormCAD® input data and output results are included in the Appendix for both the 10 year storm event and the 100 year storm event. As mentioned previously, the proposed storm sewer system has been designed for anticipated future development within the project area. It is expected that separate storm sewer systems will be designed and constructed for individual future lot developments which will capture a majority of the 9 p p l y Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 7 r � stormwater runoff and convey it into the underground pipe systems. Individual watershed boundaries and peak runoff rates have been estimated to the extent possible based on the limited knowledge of the future development of the surrounding lots. The storm sewer design is based on this limited information. It is recommended that future lot developers and owners analyze their development's impacts on the storm sewer system to ensure compliance with the Unified Stormwater Design Guidelines and limit impacts to surrounding areas and the downstream storm sewer systems and watercourses. CONCLUSION The storm sewer system for the Tower Point Infrastructure Development - Private Drive G has been Y p designed in compliance with the Unified Drainage Design Guidelines for the City of College Station, Texas. Storm sewer inlets and underground storm sewer pipes have been designed to capture and convey stormwater runoff generated from the anticipated future development of adjacent lots within the project area for a 10 year storm event. It should be expected that during less frequent, more intense storm events all stormwater runoff may not be able to enter the underground storm sewer system. It has been determined that during the 100 year storm event, storm water runoff that cannot enter the storm sewer system will continue flowing within the proposed roadways. Runoff will continue to flow within the proposed roadway until it has an opportunity to enter the storm sewer system or discharges into Spring Creek as it currently does. This report and the data contained within the Appendix should be reviewed during the design of the storm sewer systems for future lot development within the project area to ensure that the assumptions made in this report are valid and consistent with future and development and land use. Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G Page 8 APPENDIX Exhibit 1 USGS Quadrangle - Wellborn Texas Exhibit 2 FEMA Flood Map Exhibit 3 Overall Grading Plan Exhibit 4 Storm Sewer Plan and Profile (1 of 2) Exhibit 5 Storm Sewer Plan and Profile (2 of 2) Exhibit 6 Developed Conditions Drainage Area Map Exhibit 7 Arrington Road Drainage Area Map / Storm Sewer Calculations Exhibit 8 Private Drive C Drainage Area Map Exhibit 9 Storm Sewer Calculations Exhibit 10 10 year Hydraulic Grade Line Profiles Exhibit 11 100 year Hydraulic Grade Line Profiles Exhibit 12 Appendix D - Technical Design Summary Stormwater Drainage Report Tower Point Infrastructure Development - Private Drive G e9 Pa P 9 EXHIBIT 1 iv ,. nwaimpt,,,,Nottt.,....w Arc,,,mopm4;" 4f"/ it A 3TATL OF TEXAS AA.J2...i.tt ...... 'id da .17lat X11.1060311 i ■ e.s, 1,',,, tIFITED STATES " cp nc NT OF nit ugra9loa 4 ■toTT.T 'F .- -, ,..-,-- -,,,, rfir "' ' .." - ' 4"'Ni,,,,NA 1 " _ , r... 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Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 Profile Scenario: 10 YEAR Profile: ST -4 Scenario: 10 YEAR OO co O a) O O O T M M .--. CO C C C C J J J N 4) N ^ N Cll N ( � O O CO CO O O M o O. V . Mod . 9 .9 co co (B Cp a a E'T° O C C C _ _ (X = _ 320.00 315.00 Elevation (ft) 310.00 6 o @ S \ 95 010 305.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 10yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/27/10 04:25:06 PM© Bentley Systems, Inc. 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V. V N N U U N N O 7 7 C C O N (j2 E(0 (NI co n3 M > > > .E > �, O c c c_= 295.00 N E 2 2 290.00 Elevation (ft) 285.00 -SO) r 'r3 � �� / ooh i 280.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 10yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/31/10 09:10:21 AM © Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 Profile Scenario: 10 YEAR Profile: ST -7 Scenario: 10 YEAR o r 00 co 406 cy;o0 W N N • 5 c 0 C O C C C C C C J J • J J •U N = =11.71 U N CD - 0 - 0 N N a moo - M= E2 F_ r '= F2 W T^ w (a N 00 0) 0 0 °off ` ` rrr W co CD CD N • U U °o1 C7 oom°oNCD P :.%c> 7 7 N •U U N N N 7 7 5 N c0 CO N t CO 5 C C C Q N (0 al E 'S "6 NO �T > > > ccc22 N �tY22 300.00 N E IY22 295.00 Elevation (ft) 290.00 6', 7, s c.,_.... P23 -15 d' �,�c 16.70 ft 24 inch Q- ° @S0.479°° 285.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 10yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/31/10 09:16:52 AMC) Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 Profile Scenario: 10 YEAR Profile: ST -8 Scenario: 10 YEAR M = N. N D D T T O oo O T O O O • E 0 E 0 U U C C C J J J U U O) - p -a (X)� (0 (0 M M0 0 ' '' rn r 00 c� 0 N U U OO N N. . U . N N c p j 7 7 7 M 2 2 0 f0 _ E CD > > > � -, N C E M _ — C C C .E 310.00 305.00 Elevation (ft) 300.00 /o 295.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 10yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/31/10 09:18:22 AMC. Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 f EXHIBIT 11 T T "_"^ y o cui i d °.a Y N N `� o N rn W U 0 3 a` N g 8 1 8 S 8 8 8 8 8 8 8 116E'0171 0'19pe10' I PH 111 : 1160198710 9119676H li 87108 178 11 60'608 NO nut L 1 Y 86'60E90 919870 9 0 1 .0 6 H Y 0860E 91 90 1 9 0.0 1 Nn 71 P 6 H 1106118 018 ' 0 1129108 9 611 2 Y 19'01811 11 06'806 11 911 9 I 8 u' m 0 y D N W � p O L5 fr S Q m W a cc e I W 0 1— > ° U Q. 0 (n O 896' lob 00 90 LI o c 11 ES 'zOL'u19u19P710n1n71p6H c., — — CO 110Z'8oE'71'0 T+ G C C Y9696Z 00611 A CD O II 68'26Z .91991 U 1196'10E 91911 - a N 0 CO 61 , 91 u d U E A N Y L0ace N091119971016071P6H ci 116E W8 6196091/010110716H 9 - Y 08'808 .0 0 19160 00 911 E 000'860 91 9 uI 9 N m 8 000' 662 NO 99 0 9 p 0 i0An 71 P9 :. 62660 116109871011n.POH 1106'000 .8 8 11 96'6820081 _. Y 58'06Z -11 E I 0 07660 00 9 71 9 1 7, 0 7 0 00660'.0 67168710 911n7179 1100'660'.80 661'66000991 669'660 91991 Y0016000 971910 91 PAH 1107860 0 1 9 41?P71016n71POH 11 00' 660' 17 0 11 00880 00 911 1100680' 109880'91991 8 S E'E 8 o ds 0 v o o.. 1 �r 3 as = oa E,9 d o % ° ry o F oo o m Fao T � Profile Scenario: 100 YEAR Profile ST-2 Scenario: 100 YEAR L( LO Q) CS C $ O N co M LO M C 0 O O Cn N C C N ar J J 4) a) L L C C r 0 0 J J N U U LO U U j 7 7 L (0 f6 0 (6 (O cEmm 0) N N U U N O 7 7 EOM f ( > >. �_= 305.00 300.00 Elevation (ft) 295.00 p12 -1 34.50 it 24 inch g _ 1.0145 290.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \.., \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore Sto rmCAD v5.6 [05.06.014.00] 08/27/10 03:29:15 PM© Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 T r Profile Scenario: 100 YEAR Profile: ST -3 Scenario: 100 YEAR M r to N = L)r MO . C) c.j 0 o M _ 7 Cvo M 5 E0 OM E 0 CD <I.) M 5 U U C C C C J J • C D J J = U Q) C C = == CO U GV= co c ` CO JJ OCD Off= (2 CO OO U` " N. U U COO 0 0 C[) O en 0 N O U U a 0 (3 0 O) 0 06 07 N .. O. 00)N 00 V .V 0 r- en� N CO N • O 7 7 7 CO to Co O M o d U U C C C 0 M 10 (O . E "O 'O T T .. O 7 7 > > > > . � "O co C E = _ O M " co CQ Lo C C C C E _ _ > > 7 rn X 0' 2= 310.00 305.00 � $ -o� 300.00 Elevation (ft) Ls .6 v. 4 ja �6 P8 -5 0 34.50 ft 2 4 inch @5- 1.01 295.00 290.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/27/10 03:31:06 PM 0 Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 Profile Scenario: 100 YEAR Profile: ST -4 Scenario: 100 YEAR CO N CO O N L ° 00 r O M 0 0 M M : M .. p � p CD CD CD CD C C C J J J J N N N CD M od U U O .— W U U .. T 7 7 M M M 7 7 O M 7, (` C C 0 (O > >_ -0 "> > > > O C_ O 320.00 315.00 Elevation (ft) /3.30 h 10-6 310.00 CA S; g4ach 305.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/27/10 03:32:36 PM© Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 y r u° a t ° u a y ou ° 1 y H N i 'En p w0) 8 8 8 8 8 8, 8 8 8 y E m r 8 0 m 4ZL LIE NOaunweO 4nu8AH u 66'1 0 ul aun uou+O'DIna1PAH Y Z6'9LE .Id Y S9'60E 80.1 8 OZ 1 V 60')OE 40 aun 09.0 4 4 PAH I 1665')00 48 1 D.0 alnuPAH Y 9000O q8 169000080^ 992600 91^91 t 6l 00 6 EE'90E 80 aw4 40a+08ne+PAH Y 9190E ..0 awl .0910 01, ¢ +PAH 1696'6•0 .8 10110EIn0 nut 028'90E.ul nul 9l . 8 � ri 1 n N 0) 1 D 8 F. Y 15'LOE 80 a11.PM 8n1DAH 8 41610E l aw1.P.0 H. 6 )8')00 .8 0) 160)062 198'00E - ? LLI i L C ' IA y 0 YE2 0E O 4 9P 0 I 0 W vice'LOC.nl a94 ..D.1 4 441 6 SS , O 4 60'8601EO.1 M1 C) a • co g 166 660 10) 0.1 € r O co 166E96Z l Sul 8 ; '� w O f/l N O ag • B a u % u i g y r y o • • 696'090 In0 ape) 41nuplH 1606')60 u1 aun >MD 01nypAH 6 00096Z 916 481'98080^ 680')80 41u1 8 6 LE't62 4.4 601')80'11191 SL • • • u 91'890100 au1 IPU0 n,n1PAH Y 9)980 :91.91.0.109ne1PAH • 490 16)118080 g E 16 61680 .11 , O Y2fi98i In0aulapy0 up.* 0 0 Y L6'L8Z u1. 4 4.4H 4 00)6Z 416 N O Y1l'E6Z Y LZ'E92 uW A u1 - t r Y LL'EBZ 4I IW - f to EL t 4$ 6 06'990 110 1 Pe ]0 alnEPAH " 6 Et992 1 1 Pa101In9PAH A s 96 9 � I. O N 14 4 1tl I^ %LO'ZIZ r0.1_ 8 0 ' YL629Z L1..1 3 E 0 F •;'-5. ° 1- 1 O r r Profile Scenario: 100 YEAR Profile: ST -6 Scenario: 100 YEAR N CO . r � C) N cn t\ M 00 co N W N C C C C J J $ J • N 0 ' -0 t0 f0 n N M ci c6 co ci co cp n1 (\ j U U o0 0o N N .V . YO) >> N N+' cs) 7 7 O ( L D C C (0 (0 • � _ co c c c cc 295.00 290.00 Elevation (ft) 285.00 72s r -73 QpS ?64 fikY? 0 � 280.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/27/10 03:34:32 PM© Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 T I Profile Scenario: 100 YEAR Profile: ST -7 Scenario: 100 YEAR O O (n r r N N �; O N N Y O N .-% 7 z EO CD C O c C c c J J U N cc JJ mm co -0 = J J = X00 -0 -U0 Ch = 2 2 o M r 00 Es E co .1- co _ r co N CO N Or O C V r U U_ 00 00 0000 N 0 O o cn o r 0 r o N 6 . U 7 7 3 N • U U NNN::0 0 7 O N G7 ( co O N ( (0 > > > > - T - T N C Fc Ii N> TT Loccccii 300.00 N E tY 2 2 295.00 • Elevation (ft) 290.00 0, i f ' 75 S -D_... . P23 -15 � och 16.70 ft 24 inch o q© S = 0.4790 % 285.00 0 +00 1+00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/27/10 03:35:42 PM© Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 • Profile Scenario: 100 YEAR Profile: ST -8 Scenario: 100 YEAR .0o =m N c? O M 'CSC') O •• WW WW C C C C J J J WW C) C)N= ((0 ((0 M 00 p odod Cr' O C7 �} "06 . 7 M m @ (6 C C O M 22 O C.0 >>>7,7, N >IY2'2 — C C C E = _ 310.00 305.00 Elevation (ft) 300.00 P25 -16 2420 ft 24 inch @5= 0.950 295.00 0 +00 1 +00 Station (ft) Title: Tower Point Infrastructure Development Project Engineer: Kenneth Rich p: \... \stormcad \2010 -08 -27 - total 100yr.stm Walter P Moore StormCAD v5.6 [05.06.014.00] 08/31/10 09:19:55 AMC) Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1 EXHIBIT 12 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 2 - Project Administration Stari (Page 2 1) En • ineerin and Desi n Professionals Information Engineering Firm Name and Address. Jurisdiction City' Bryan SEC IZE Po,t X College Station p, mo g.G 4 A,SSo, Date of Submittal, Lead Engineer's Name and Contact Info.(phone, e -mail, fax) Other Cel KC vtN S w,.r. c taw Eta^ pe)44641t.e011, Kr:Vin} Sut_t»tVF o /k3.4./130.1"330 bupporting Engineering/Consulting Firm(s) Other contacts. SH /*win) e-Essn1A, Developer / Owner / Applicant Information Developer / Applicant Name and Address. Phone and e -mail MICHAEL CoawrZ -f , 3,554.1i.453 51.z' Pea i ohK diu9 Sit SST oN)'ttj.3 01,H4'i1 _ _kd 1d.3t2t . -sap L31 1 r _ �m iecr� >�+�tr u r E . mom Property Owner(s) if not Developer / Applicant (8 address) Phone and e -mail S0.M.t hS Project Identification Development Name. Is subject property a site project, a single -phase subdivision, or part of a multi -phase subdivision'? S 1 � ) (4,1.eP>!A'�� If multi - Phase, surhjPrt prnpp,rty is phase of Legal description of subject property (phase) or Project Area: (see Section 11, Paragraph B -3a) TaWel!Z ft. iNi )toPYtA54'RA SIALe P C.1VAr piime 4(a 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. N1A General Location of Project Area, or subject property (phase) SEE. RePo&T In City t+mits? Extraterritorial Jurisdiction (acreage) Bryan aces Bryan. College Station College Station I t, 3 acres Acreage Outside ETJ STORMWATER DESIGN GUIDELINES Pdge 3 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 2 - Project Administration [ Continued (page 2.2) I Project Identification (continued) Rnadways abutting or within Project Area or Abutting tracts. platted land, or built subject property developments f RIVATg. cogwes C, G,, iN L b'f`S x$ i y- LZ 2.3A 42 7 ,6 .., R&RiNt 1 j RoAp SEE Po RI) Named Regulatory Watercouise(s) & Wdteisiied(s)_ Tributary Basin(s) Scv. itePa Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: N1Nc 1 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 M anagement Planning For Project or Subject Property (or Phase) Planning Confeences) & Date(s) Participants: N( Preliminary Report Required? NVII. Su bniittal Date Review Date Review Comments Addressed Yes No In Writing? When Compliance With Preliminary Drainage Report. Briefly describe (or attach doLunientatiun explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any STORIVIVVATER DESIGN GUIDELINES Page 4 of 26 APPENDIX 0 TECH DESIGN SUMMARY Effective February 200/ As Revised February 2009 • SECTION IX 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 be1ow attach documentation describing and substantiating any agreements understandings contracts. or approvals. Dept FContact, Date Subject Coordination With Other Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates) Non-jurisdiction City Needed? Yes No) Coordination with Summarize need(s) & actions taken (include contacts & dates) Brazos County Needed? Yes No X Summarize need(s) & actions taken (include contacts & dates). Coordination with TxDOT Needed' Yes No X Summarize need(s) & actions taken (inciude 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? It so, summarize status of efforts toward that objective in spaces below. Permitted or Entity Approved Status of Actions (include dates) US Army Crops of Engineers No ) Yes US Environmental Protection Agency No X Yes Texas Commission on Environmental Quality No > Yes Brazos River Authority No Yes STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDiX a 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 impervious cover? 1 1.•� oofr)M - c, :44AIANOrr euEt :cinrf` =o.go Site 1 X Redevelopment of one platted tot, or two or more adjoinrnrg platted tots. Development I Budding on a single platted lot of undeveloped land. Project Building on two or more platted adjoining lots of undeveloped land (select all Building on a single lot, or adjoining lots, where proposed plat will not form applicable) a new street (but may include ROW dedication to existing streets). Other (explain) Construction of streets and utilities t o serve one or m ore platted lots Subdivision p Development 1r Construction of streets and utilities to serve one or more proposed lots on Project lands represented by pending plats. Sit 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 Nature and dranage easements or ROW Size of Proposed Project Is any work planned on Ittnd that is not platted yes, explain; or on lanrt 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 H. Paragraph 81) or a tributary thereof? is any part of subject property in floodplain area of a FEMA - regulated watercourse? No X Yes Rate Map Encroachment(s) 1 Encroachment purpose(s): Building site {s) Road crossino(s) into Fl into Floodplain 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 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics L Continued (Payt.: 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic analysis been done for larger area including subject prupefty'' I Yes Reference the study j& date) here. and attach copy if not already in City files X Ogx\ 1"‹: NAL Wvi•PkovLn‹. 03- OZ.-D'A SeS EEPo‘V Is the stormwater management plan fur the property in substantial conformance with the earlier study? Yes X. No If not, explain how it differs If subject property is not part of multi-phase project. describe stormwater management No 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 IA peity wilt curliply 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 propeity? X No Yes Identify Based on location of study property in a watershed, ts Type 1 Detention Wood control) needed? (see Table B-1 in Appendix 8) Detention is required. Need must be evaluated. X Detention not required • What decision has been reached? By whom? If the need tor How was determination made? Type 1 Detention must be evaluated • STORMWATER DESIGN GUIDELINES Page 7 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 Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) Does subject property straddle a Watershed or Basin divide? X Nu Yes If yes, describe splits below. In Part 4 describe design concept for handling this Watershed or Basin ! Larger acreage Lesser acreage SPRtas atter. Above- Project Areas(Section II, Paragraph B3 -a) Does Project Area (project or phase) receive runoff from upland areas? X No Yes Sizo(c) of arca(c) in acrd: 1) 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(sl, small creek (non- regulatory), regulatory Watercourse or tributary); Flow determination Outline hydrologic methods and assumptions Does storm runoff drain from public easements or ROW onto or across subject property? No Yes If yes, describe facilities In easement or ROW: Are changes in runoff characteristics subject to change in future? Explain 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). STORMWATES DESIGN GUIDELINES Page 8 of 26 APPENDIX D. TECH, DESIGN SUMMARY Effective February 2007 As Revised Febn, iary 2m) SECTION IX 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? % Created by? plat, or easements instrument. If instrument(s), describe their provisions. exist for any part of pathway(s)? X No Yes Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing water courses? 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). EX iSn'ir -le, STALA. 5✓E.4.4 A. N,a ti .0A4v et G' Aso A RJt.t G,Tbt») R. O . Nearby Dr ainage — Facilities Do any of these have hydrologic or hydraulic influence on proposed stormwater design? No X Yes If yes, explain: SSE K EPt) R-r . 5TUF MATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. 0 TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters I Start (Page 4 1) Storrnwater Management Concept Discharge(s) From Upland A rea(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 see +., E P o k.s' (-.e a - - Discharges) To Lower Property(ies) (Section Il, Paragraph E1) Dues project include drainage features (existing or future) proposed to become public via platting? )( No Yes Separate Instrument? No Yes Per Guidelines reference above. how will Establishing Easements (Scenario 1) runoff be discharged to neighboring Pre - development Release (Scenario 2) property;ies} tU /A 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 releases) will be managed to pre - development conditions (detention. sneet flow partially concentrated, etc) (Attached Exhibit # Combination- If combination is proposed, explain how discharge will differ from pre - development conditions at the property line for each area (or point) of release. If Scenario 2, or Combination are to be used has proposed design been coordinated with owner(s) of receiving propertyties)? No Yes Explain and provide documentation STORMWATER DESIGN GUIDELINES Page 10 of 26 ANNLNUIX t) I E(H UISIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters 1 Continued (Page 4.2) Stormwater Management Concept (continued) Within Protect 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 I eCa,tok,/ &' 1\e3 T Yes NIS of Ati2.;.14t'orJ ILO 5(4 or kv.s Y t: (s CE EX1-1,16 -4 Huw will runoff (torn Pzujeut 1. With facility(ies) irnvulvn iy utl ter develupnrent projects Area be mitigated to pre 2 Establishing features to serve overall Project Area. development conditions Select any or all of 1. 2, 3. On phase (or site) project basis within Project Area. and/or 3, and explain below. 1. Shared facility (type & location of facility: design drainage area served: relationship to size of Project Area) (Attached Exhibit # 2. For Overall Project Area (type & location of facilities). (Attached Exhikiit K - ) 3. By phase for site) proiect Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part Are aquatic echosystems proposed? )C No Yes In which phase(s) or project(s)? Cs- -0 rn C Are other Best Management Practices for reducing stormwater pollutants proposed? n. No )L Yes Summarize type of BMP and extent of use 01 z If design of any runoff - handling facilities deviate from provisions of B -CS Technical k Specifications, check type facility(ies) and explain in later questions Detention elements Conduit elements Channel features Swales Ditches Inlets Valley gutters Outfalls Culvert features Bridges Other STORMWATER DESIGN GUIDELINES Page 11 Of 16 AI'HtrNUIX U 1 ECH 1.)5:51(.3N SUMMAKY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert (s)? No 1 g (s ) � 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 sr,hject phase or site project (physical location, conveyance pathway(s), construction sequence)' C °N » ' 'Ll- (LoiA,C,A, A. 4 "Stv 'S 1r5 mp.,, 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)' Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? i Surfaces? - a _ N - Steepest side slopes Usual front slopes. Usual back slopes: t � _u Flow fine slopes: least Typical distance from travelway: .5 (Attached Exhibit # ) a typical greatest Z co Are longitudinal culvert ends in compliance with B -CS Standard Specifications? Q Yes No, then explain m ; At intersections or otherwise. do valley gutters cross arterial or collector streets? 5 - y { No X Yes If yes explain pg„►VC U $C 3 cp k + At3 AR. k34tur.J e...0 RD ft DRiiE y Y Are valley gutters proposed to cross any street away from an intersection? z No X Yes Explain (number of locations - ?) 7� 3 w � • � d r STORMWATER DESIGN GUIDELINES Page 12 of 26 APPFN 0 TECH DESIGN SUMMARY Effective February 2007 As Revised February 200 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes. Least 3.0'x. Usual Greatest t, .e /. Are inlets rece se -ii on arterial and collector streets? X Yes No If - no .. . identify where and why Will inlets capture 10 -year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? X, Yes No If no, explain where and why not. d • Will inlet size and placement prevent exceeding allowable water spread for 10 -year • design storm throughout site (or phase)? ?d Yes No lino, explain rn a c S aq curves: Are inlets placed at low points? ?O Yes No Are inlets and conduit sized to prevent 100 -year stormflow from ponding at greater than 24 inches? u x Yes No Explain "no' answers. .3 v N d Q1 Will 100 -yr stormflow be contained in combination of ROW and buried conduit on `t whole length of all streets? h Yes No If no. describe where and why Do designs for curb, gutter, and inlets comply with D -CS Technical Specifications? Yes X No If not, describe difference(s) and attach justification. 2- ChoDinEn t■t,t ors N• sto>r 4F iiv‘ 4 ntek.rZa t.Yc 28 Are any 12 -inch laterals used? )q No Yes Identify length(s) and where used • Pipe runs between system to r access points (feet). Typical 5 Longest Z. t a.) I Are junction boxes used at each bend? ?C Yes No If not, explain where a and why O Z . E • Are downstream soffits at or below upstream soffits? Least amount that hydraulic Yes )r; No If not, explain where and why: grade line is below gutter line (system- wide) STORMWATER DESIGN GUIDELINES Page 13 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 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Describe watercourses , or system (s) ys Oreceiving system discharge(s) below u (include design discharge velocity, and angle between converging flow tines) cis 1) Watercourse (or system), velocity, and angle? � o EE REP° l� ci P CANS w E 2) Watercourse (or system), velocity, and angle? c o ci 0 SEE REPo - 9 ,„, N ; 3) Watercourse (or system), velocity. and angle? T m ° /'e. P-V CIl br A. ?LAOS 0 'o a E � For each outfatl above. what measures are taken to prevent erosion or scour of 8 a receiving and all facilities at juncture? io 1) 1-4( m 2) 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 tiumes it any): 1' v Flow line slopes (minimum and maximum) c 0 Z Outfatl characteristics for each ( velocity. convergent angle. & end treatment) ur v Q j Will 100 -year design storm runoff be contained within easements) or platted drainage ROW in all instances? Yes No If no explain' STORM'MWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX D TECH. DESIGN SUMMARY Effective February 200 As Revised February 2009 � t SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Are roadside ditches used? ?f No Yes If so. provide the following Is 25 -year flow contained with 6 inches of freeboard throughout ? Yes No 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 P P ` For any ''no" answers provide location(s) and explain. 0 If conduit is beneath a swale, provide the following information (each instance) Instance 1 Describe general location, approximate length. > Is 100 -year design flow contained in conduit/swale combination? Yes No u If no explain. o a Space for 100 -year storm flow? ROW Easement Width c Swale Surface type, minimum Conduit Type and size, minimum and maximum )(I c and maximum slopes slopes, design storm O a • O Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): • c m u c ° � n o Access Describe how maintenance access is provided (to swate, into conduit): o • m o E � • o ' E Instance 2 Describe general location, approximate length: • m � N c Is 100 -year design flow contained in conduit/swale combination? Yes No a ° o o If no explain • + t 4 c E 71, Space for 100 -year storm flow? ROW Easement Width 0 Swale Surface type, minimum Conduit Type and size, minimum and maximum a ro and maximum slopes.: slopes, design storm: O el• V , Inlets Describe how conduit is loaded (from streetslstorm drains, inlets by type) c o �`� Access Describe how 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 t t t � 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 Instance 1 Describe general location. approximate length, surfacing: a E • Is 100 -year design flow contained in swale? _ Yes __ __ No Is swale wholly c within drainage ROW? Yes No Explain "no' answers • Access Describe how maintenance access is provide. 0 Z 0 -° 2 instance Describe general location, approximate length, surfacing a c a 7 N • N o E ✓ at - m Is 100 -year design flow contained in swale? _ Yes No Is swale wholly . withi n n drainage ROW? Yes No Explain "no" answers- • CC Access Describe how maintenance access is provided U .f] 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 Will design replicate natural channel? Yes No If "no ", for each instance 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. in C N � • Instance 2' a E ° •- Z w c X Instance 3' c ca L STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2001 As Revised February 2009 s SECTION IX APPENDIX 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) 1 Existino channels (small creeks): Are these used? _)g_ No Yes If "yes' provide the information below. Will small creeks and their floodplains remain undisturbed? Yes _____ No How many disturbance instances? Identify each planned location , f k For each location, describe length and general type of proposed improvement (including floodplain changes). For each location, describe section shape & area, flow line slope (milt & max.), surfaces, and 100 -year design flow. ii 1 o o Watercourses (and tributaries): Aside from fringe changes. are Regulatory Watercourses proposed to be altered? ?G No Yes Explain Ueluw rz Submit full report describing proposed changes to Regulatory Watercourses Address E existing and proposed section size and shape, surfaces. alignment, flow line changes, O length affected, and capacity, and provide full documentation of analysis procedures o and data. Is full report submitted? Yes No If "no" explain, E f ID r -c All Proposed Channel Work: For all proposed channel work. provide information requested in next three boxes. N /s4 if design is to replicate natural channel, identify location and length here, and describe design in Special Design section of this Part 01 Repuit. f 1 I Will 100 -year flow be contained with one foot of freeboard? Yes __ No If not, identify location and explain • Are ROW/ easements sized to cut Rain chan lei and i equired mail tenar ice space? { Yes — No If not, identify location(s) and explain { STORM/WATER DESIGN GUIDELINES Page 17 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2007 As Revised February 2009 L. . 1 � SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 Drainage Concept and Design Parameters Continued (Page 4.9) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase. or Site) (continued) How many facilities for suhjert property project? For each provide info below For each dry -type facilitiy Facility 1 Facility 2 Acres served & design volume + 10% 100 - yr volume:: free flow & plugged Design discharge (10 yr & 25 yr) Spillway crest at 100 -yr WSE? yes no yes no Berms 6 inches above plugged WSE? _ yes no yes no Explain any no answers: a) - For each facility what is 25 -yr design Q, and design of outlet structure? Facility 1. 0 Z Facility 2. Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1 — Yes No Facility 2. Yes No If "no" explain U a For each. what is velocity of 25 -yr design discharge at outlet? & at spillway? Facility 1 & Facility 2 u Are energy dissipation measures used? No Yes Describe type and u location: c 4 0 For each, is spillway surface treatment other than concrete? Yes or no, and describe. z s Facility 1 • Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1 Facility 2 r If berms are used give heights, slopes and surface treatments of sides_ Facility 1 � I Facility 2 STORMWATER DESIGN GUIDELINES Page 18 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2007 As Revised February 2009 i r SECTION IX 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 explan if -nos': Facility 1 a Facility 2 c f o c c u a 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 r o Are culverts parallel to public roadway alignment? Yes No Explain N Y I IO a Creeks at Private Drives: f?n private. driveways, drives, nr streets cross drainage o' o ways that serve Above - Project areas or are in public easements/ ROW? v z No Yes If 'yes" provide information below. x How many instances? Describe location and provide information below . Location 1: - Location 2 Location 3: For each location enter value for. ! 1 2 3 Design year passing without toping travelway? F I ° 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 Page 19 of 26 APPENDIX. D TECH DESIGN SUMMARY Effective February 2007 As Revised F ;ebriary_2009 R 1 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters I 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 • a, Arterial or Major Collector Streets: tAfiII culverts serve these types of roadways? c. No X Yes Haw many instances? j For each identify the m location and provide the information below. } n I nstance 1. HW 4-to 4 DRak1' N C i DD z APPRavkC) ?„' Instance 2_ 0 Instance 3: o .�o • Yes or No for the 100 -year design flow: [ 1 2 3 o Headwater WSE 1 foot below lowest curb top's E Spread of headwater within ROW or easement? o� Is velocity limited per conditions (Table C 11)? 7 c Explain any "no" answers) to O c CO • o o .- Minor Collector or Local Streets: Will culverts serve these types of streets? u v, No Yes How many instances? for each identify the = v location and provide the information below: a. a m >. Instance 1 N " c Instance 2: ro u, o Instance 3: t _�— — c ror each instance enter value, or yes" / no for. 1 2 3 v m a , Design yr. headwater WSE 1 ft below curb top? , < c, 1 00 -yr. rnax depth at street crown 2 feet or less o Product of velocity (fps) & depth at crown (ft) ? o Is velocity limited per conditions (Table C -11)? Limit of down stream analysis (feet)? Explain any no answers: STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX 0 TECH DESIGN SUMMARY Effective February 2001 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.12) Stolmwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except dnvewaylroadsrde ditch intersects) provide information requested in next eight boxes Do culverts and travclways intersect at 00 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 locationfs) and provide justification Q Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? No Yes If "yes" identify location(s), describe outlet' design troatmont(s): Is scour /erosion protection provided to ensure long term stability of culvert structural ci components. and surfacing at culvert ends? Yes No If no Identify locations and provide justification(s): Wltl 100 -yr flow and spread of backwater be fully c:untained in street ROW, and /or drainage easements/ ROW? Yes No if not, why riot? Do appreciable hydraulic effects of any culvert extend downstream or upstream to neighboring land(s) not encompassed in subject property? No Yes If "yes" describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B -CS Tech Specifications? Yes No If not, explain in Special Design Section of tl tib Part. STORMVVATER DESIGN GUIDELINES Page 21 of 26 APPENDIX D'. TECH DESIGN SUMMARY Effective February 2007 As Revised February 2009 i 1 r � SECTION IX 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) T ---- 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? N i A full report supporting all aspects of the proposed bridges) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? Yes No If "no" explain: Is a Stormwater ( Provide a general description of planned techniques. Pollution Prevention Plan(SW3P) 51t_' rrENGel INLET PR.a E.(.144 / Q established for project construction? T rv∎PD ps.R-`9 Ca &I 51 L-:.N's"Gt,..A.Y-,✓/ No )(.Yes 5 eeptpsy (5 et., Gn)SsAu,trr kx) (kpaS) 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? )d 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: STORMWATER DESIGN GINDF.LINES Page 22 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2007 As Revised February 20Q9 � 1 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 - Drainage Concept and Design Parameters 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 Technical Specifications. check type facility(ies) and explain by specific detail element. Detention elements Drain system elements Channel features Culvert features Swales Ditches k Inlets Outfalls Valley gutters Bridges (explain in bridge report) In table below briefly identity specific element, justification for deviation(s). Specific Detail Element { Justification for Deviation (attach additional sheets if needed) 1) L I UIRa 'j Ni 3-Nt.EQ OP£M04 N 'NP DF B0)0 - rb 0..1 0; 2) L56. c4.1143511,y4osi,a J PL 5) 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. .5 > 1) ve tt,c,s 13R.:0 e,E5, (,/Lt /t 2) 3) 4) 5) Design Parameters Hydrology Is a map(s) showing ail Design Drainage Areas provided? Yes No Briefly summarize the range of applications made of the Rational Formula. j UISF 0 • i Rwa o ? ebC i( / 03 10 4 5rg. R.c1'o .5TbRrvt Ederats What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? O- acres Location (or identifier): STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX D: TECH DESIGN SUMMARY Effective February 2007 As Revised February 2009 • 1 SECTION IX APPENDIX - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters I Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making determinations for time of concentration, was segment analysis used? No )4 Yes In approximately what percent of Design Drainage Areas? _1 00 As to intensity-duration-frequency and rain depth criteria for determining runoff flows, were any criteria other than those provided in these Guidelines used? )( No Yes If "yes" itieritify type of data, suurce(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 to* to ittoo Storm drain system for local streets N/A. Open channels !kVA. Swale/buriod conduit combination in lieu of channel • Swales Mr*, Roadside ditches and culverts serving them Detention facilities: spillway crest and its outfali Detention facilities: outlet and conveyance structure(s) Detention facilities. volume when outlet plugged NA/A Culverts serving private drives or streets Woe. Culverts serving public roadways Bridges: provide in bridge report. /1 Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities: Gutters Conduit I Culverts Swales Channels Highest (feet per second) h i.% 1 5,6 Mitt 14 A Lowest (feet per second) 3. Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used. For street gutters: 011 For nnntliJit type(s) kce Coefficients D. 0 3 STORMWATER DESIGN GUIDELINES Page 24 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 I 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? )k No Yes Head and friction losses 24 No Yes Explain any "yes" answer In conduit is velocity generally increased in the downstream direction? ?G Yes No Are elevation drops provided at inlets. manholes, and junction boxes? NC Yes No Explain any no answers: Are hydraulic grade lines calculated and shown for design storm? ?Q Yes No For 100-year flow conditions? x Yes No Explain any 'no" answers: What tailwater conditions were assumed at outfall point(s) of the storm drain system' Identify each Location and explain: 11/4/N Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? ISiA Yes No Outside of straight sections, is flow regime within limits of sub - critical flow? N/A Yes 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? 1A Entrance, friction and exit losses. Bridges Provide all in bridge report StORMVVATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D TECH DESIGN SUMMARY Effective February 200/ As Revised bruary 20Q9 . s T SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters I 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 ,rt 2_,,, Cpo 6 y 3Ev - 7 S , Y_ S.L. Part 5 — Plans and Specifications 1 Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section 111, 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 Parr 8 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 under applicable general permits " �~ (Affix Seal) l i Lrcen - • d Professional Engineer 1 1 State of Texas PE No, 10 3 9 3 $ , STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX D TECH DESIGN SUMMARY Effective February 2007 As Revised February 20Q9 ■