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HomeMy WebLinkAboutDetention and Draiange System ReportREVISED DETENTION AND DRAINAGE SYSTEM REPORT FOR CASTLEGATE II SUBDIVISION, SECTION 200 COLLEGE STATION, TEXAS March 2011 Revised April 2011 Prepared by: Phillips Engineering 4490 Castlegate Drive College Station, Texas 77845 (979) 690 -3141 GENERAL INFORMATION AND BACKGROUND The Castlegate II Subdivision is a 202 -acre development located immediately southwest of the existing Castlegate Subdivision in south College Station. It is a single - family residential development that has 629 lots under its current layout. The new subdivision is split roughly in half by the extension of Victoria Avenue through the tract. Sections 100 -107 are located on the northwest side of Victoria and Section 200- 208 are located to the southeast. The first phase of development in the subdivision will be Section 200, which includes 47 lots located near the current terminus of Victoria Avenue. It involves the construction of all standard infrastructure associated with a residential subdivision. The 202 -acre tract lies across the drainage divide that separates the Spring Creek Drainage Basin in the north and the Peach Creek Drainage Basin to the south. As a result, the development will require two independent drainage systems and two detention ponds. The larger of the two detention ponds is in the Spring Creek Basin and will be constructed initially with Section 200. It will serve Sections 100 -107 and 200 -201. It will be located near the intersection of Victoria Avenue and WS Phillips Parkway as shown on the Preliminary Plat in Exhibit A. The second pond will be built in conjunction with Section 202 at the south end of the development and will serve Sections 202 -208. The Detention and Drainage Report that follows analyzes the first pond (referred to as Pond A) only. The second pond (Pond B) will be addressed with the development of those subsequent phases. DETENTION SYSTEM REPORT The Spring Creek Drainage Basin has been studied extensively in recent years in conjunction with the Tower Point Development, Castlegate Subdivision, and the Spring Creek Residential Developments, all of which are located downstream from Castlegate II. A large regional detention pond was constructed for those projects many years ago and continues to function in that role. The most recent study of Spring Creek was conducted by Walter P. Moore & Associates, which determined that the regional detention pond was capable of attenuating the 100 -year flood event for the developments it was intended to serve. It also found there was no additional capacity for storage in the pond, so any circumstance that caused an increase in the peak flows into the pond could not be tolerated. The Castlegate II tract, which lies outside of those originally planned developments, was assumed to be developed under low density residential uses. Current plans for the subdivision have it at a much higher density, so it became necessary to detain runoff from the new site in order to stay within the capacity of the regional detention pond. The regional detention pond at Tower Point was designed to attenuate the 100 -year rainfall event, which was the standard for pond designs at the time it was planned The outfall structure is not designed to attenuate the 2 -yr through 100 - yr events as described in the current BCS Design Guidelines. The Castlegate Subdivision was developed with the understanding that 100 -year flood event could pass through the major streams and channels, so in order to prevent flooding of any adjacent structure, the building pads were raised well above the 100 -year flood level. At the present time, there are no known flooding issues along the segment of Spring Creek downstream of Castlegate II. Following several conversations with the City staff and engineers from Walter P. Moore, it was concluded that requiring detention of 2 -yr through 50 -yr rainfall event for the Castlegate II Subdivision would likely have the undesirable effect of increasing the peak flows reaching the regional detention pond, causing it to exceed its maximum capacity. This effect would be caused by the delayed timing of the peak flows released by Pond A in Castlegate II reaching the regional pond at the same time that peak flows from other parts of the basin were also reaching it. In keeping with that decision, the design of Pond A in Castlegate II was prepared with the goal of attenuating the 100 -yr rainfall event, but not the lesser events that would otherwise be required. The LOMR prepared by Walter P. Moore for Spring Creek indicates that the 100 -yr floodplain lies over a portion of this site, and extends downstream of the site through the existing Castlegate Subdivision. It will be demonstrated later in this report that the peak flow rates from the two detention ponds during the 100 -yr event are less than those anticipated in the Walter P. Moore Study. Detention Concept The proposed site of Pond A in Castlegate II is immediately upstream of an existing detention pond in the Castlegate Subdivision. The area around the existing Castlegate pond is a privately owned park that has been highly landscaped and manicured, except for the upper end near its border with the Castlegate II property. This unused area is available for the expansion of that existing pond, thus allowing the area needed for Pond A to be minimized. The two ponds will work in series with one another, with the culverts under WS Phillips Parkway acting as an outlet control structure for Pond A. The outlet control structure for the existing pond in Castlegate will be modified to restrict the flows to a greater level than currently provided. Both ponds are expected to have permanent pools of water below the storage level to serve as an aesthetic amenity. Hydrologic Analysis Design Software: Soil Group Design Storm Storm Intervals Note: Computations for CN, % Impervious, and Lag Times are shown in Exhibits C & D. Pond Information Existing Castlegate Pond Outlet Structure: Emerg. Spillway: Pond A in Castlegate II Outlet Structure: Emerg. Spillway: HEC -HMS 3.3 Type D 24 hr, SCS Type III distribution 100 year event Summary of Results The Pre- and Post - development flowrates were analyzed immediately downstream of the outlet control structure of the existing detention pond near Castlegate Drive. Location 4 -6'x 3' reinforced concrete box culverts Pavement surface of WS Phillips Parkway Study Pt A2 Castlegate Drive 448.8 cfs Multi- staged, broad - crested weir (modified from existing structure) Trapezoidal channel above the broad - crested weir Pre -Dev Post Dev Reduction 405.3 cfs 43.5 cfs Max. WSEL — Mod. Castlegate Pond (peak 100 yr) = 309.10 Max. WSEL — Mod. Castlegate Pond (blocked) = 309.80 Top of Berm — Mod. Castlegate Pond = 310.50 Max. WSEL — Pond A (peak 100 yr) = 311.70 Max. WSEL — Pond A (blocked) = 314.70 * Low Pt of WS Phillips Pkwy = 314.03 * Note: This figure is estimated based on assumptions of how the future roadways and park around the detention pond will be developed and how the final contours are set. It is not possible to accurately compute the storage volume and peak WSEL upstream of WS Phillips Parkway until final grades in the park and surrounding streets are established. For purposes of this study, the assumption was made that the lowest elevation on the other three future streets encircling the park/detention area was 315.0 ft. The Blocked Outlet Conditions shown above assume both pond outlets are blocked at the same time. The Walter P. Moore Study of Spring Creek computed a flowrate of 626.6 and 671.0 cfs for the Existing and Ultimate Development Conditions respectively at this same location. Since the anticipated flowrates from the two detention ponds are lower than either of these two figures, we assume that there is No Adverse Effects on the downstream properties by the development of Castlegate II, including the fill that will be necessary in the floodplain to construct portions of WS Phillips Parkway and Victoria Avenue. Applicable Exhibits: Exhibit A — Drainage Area Map — Pre - Development Exhibit B — Drainage Area Map — Post - Development Exhibit C — CN Computation Worksheet Exhibit D — Drainage Area Lag Time Computations Exhibit E — Reach Lag Time Computations Exhibit F — HEC -HMS Summary Output File — Pre - Development Exhibit G — HEC- HMS Summary Output Files — Post - Development Storm Drain Design Parameters Street Design: DRAINAGE SYSTEM REPORT General Hydraulic and Hydrologic Characteristics Section 200 of the subdivision includes the headwaters of Spring Creek Trib A2A, which is where the proposed detention pond (Pond A) will be located. The area around the detention pond has been cleared by previous owners, but many of the larger trees were left and are scattered in the general area. The residential portion of this phase is located generally east of the detention pond. The topography is gently sloping toward the channel with densely wooded ground cover. • Standard cross - section (3% cross - slope) • Laydown curb, Standard Curb • Asphalt pavement • Standard recessed curb inlets T Methodology: TR 55 T, Minimum 10 minutes Design Storm Event: 10 -year Pipe Materials: RCP and HDPE. Concrete box culverts are used for detention pond outfall. Manning's n Value: 0.013 Runoff Coefficients: 0.55 for surrounding development Design Constraints: Design Software: AutoCAD 2011 w/ Civil 3D Hydraflow Storm Sewer Design Package Applicable Exhibits: Max water depth: Laydown curb = 4.5 in. or 0.38 ft. Standard curb = 6 in. or 0.5 ft Min flow velocity = 2.5 fps Max flow velocity = 15 fps 100 -yr storm runoff maintained within the ROW (4 inches above curb) Exhibit H — Storm Sewer Drainage Area Map Exhibit I — Time of Concentration Calculation Worksheet Exhibit J — Gutter Depth Calculation Worksheet Exhibit K — Inlet Size Computation Worksheet Exhibit L — Hydraflow Pipe Analysis Summary (10 -yr and 100 -yr storms) To the City Engineer for the City of College Station, Texas: Re: Castlegate II Subdivision, Sections 100 -107 & 200 -201 Certification Statement I have conducted a topographic review and field investigation of the existing and proposed flow patterns for stormwater runoff from the Castlegate Subdivision, Sections 100 -201. 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DATE DESCRIPTION DRAWN BY: 4490 Caslegate Drive DESIGNED BY: KML DRAINAGE AREA MAP College Station, Texas 77845 PLOT DATE: 4/19/2011 CASLTEGATE II SUBDIVISION (979) 690-3141 Fax: (979) 690 -1041 TBPE Firm No. F -13130 Jr duty % palOpm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °: 0 0 O O co O O O O O O C C C C O „ o 0 0 0 O O 0 0 O O 0 O 0 O M „M O 0 cog) Raw a�euteaQ ploy 0 0 0 0 0 0 0 q 0 0 0 0 0 0 0 oo cia CU co cia cla q b g marauuuoa JO ssauIsng to • 4 CO y cl a �i )eyuap)sa� suaQ OH a 000 o rn S CO • C •mml v juguapgsali ,CiIsuacwmpayv 4, )eUuapisag ChsuaQ mo7 to H CCI 00 (sseuj) aaedS uad° o v, - v 0 �l2 v n O O l� O v, 0 o; , , as O N , , o O; C ND Pala M o a 0 N s n s s 00 0000 o 0 t- N n o0 •~ oo b `� 0 ice, Cog) eaay aSeuleau ploy 4 ° h N b ^ n �; • ° o `— c A „��;� o �o ���� 0 - - 00 rn • 4 Wed '$ sumr1 v O 000 P - cy 0, E - o P e V D (aimed aood) 00 a .0 0, 0 0 ped aseg auolsawl'( `o 00 00 U U H E E . a r 0. ^ � 0. va E4 04 0 seaatl snoinaadwl a a a o°O, 0. 0. a, kl W t, M O t, d ti .^. 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C C co 0 Q) CO o O w E O) @ >, O c O O C o a a 2 coo 11 11 11 11 11 11 z J c N C/) L L m U U h 1- N r N N M ce tY EXHIBIT F CASTLEGATE II SUBDIVISION HEC -HMS SUMMARY OUTPUT - Pre Development Modeling Variables: Design Storm = SCS Type 111 Reoccurrance Interval = 100 yr Length of rainfall event = 24 hr Computational step interval = 1 min Hydrologic Element Area Peak Discharge Volume Time of Peak (sq. mi.) (cfs) (ac -ft) 100 0.093 215.9 01Jan2010, 12:51 45.10 101 0.025 87.6 01Jan2010, 12:25 12.50 102 0.009 40.1 01Jan2010, 12:13 4.40 110 0.019 68.8 01Jan2010, 12:20 8.50 111 0.165 373.0 01Jan2010, 12:48 73.30 112 0.007 25.1 01Jan2010, 12:22 3.20 113 0.126 270.0 01Jan2010, 12:52 55.80 120 0.024 106.6 01Jan2010, 12:11 10.50 121 0.201 367.4 01Jan2010, 13:10 92.20 Castlel - Existing Pond 0.213 440.6 01Jan2010, 12:51 96.00 R1 - A2A Upper 0.024 106.6 01Jan2010, 13:16 10.50 R2 - A2A Lower 0.222 448.8 01Jan2010, 13:22 99.70 Stdy Pt Al - WS Phillips 0.188 395.6 01Jan2010, 12:48 83.80 Stdy Pt A2 - Castlegate Pwy 0.222 448.8 01Jan2010, 12:51 100.40 Stdy PtA3 - Confl A2B 0.315 613,3 01Jan2010, 13:19 144.80 Stdy Pt B - Greens Pr 0.327 620.1 01Jan2010, 13:01 148.00 Total - Both Basins 0.669 1,236.4 01Jan2010, 13:12 304.50 POND DATA Pond Peak Storage Max WSEL ac - ft ft Castlel- Existing Pond 4.3 308.10 EXHIBIT G CASTLEGATE II SUBDIVISION 0 HEC -HMS SUMMARY OUTPUT - Post Development Modeling Variables: Design Storm = SCS Type Ill Reoccurrance Interval = 100 yr Length of rainfall event = 24 hr Computational step interval = 1 min Hydrologic Element Area Peak Discharge Volume Time of Peak (sq. mi.) (cfs) (ac -ft) 200 0.093 215.9 01Jan2010, 12:51 45.10 201 0.053 153.7 01Jan2010, 12:35 26.20 202 0.009 40.1 01Jan2010, 12:13 4.40 210 0.165 353.8 01Jan2010, 12:59 86.00 211 0.125 350.8 01Jan2010, 12:38 66.20 220 0.024 106.6 01Jan2010, 12:11 10.50 221 0.201 367.4 01Jan2010, 13:10 92.20 Castlel- Modified 0.241 400.7 01Jan2010, 13:13 121.60 Castle2- North -Pond 0.188 402.5 01Jan2010, 13:05 95.70 Castle2- South -Pond 0.125 309.0 01Jan2010, 12:52 65.60 R1 - A2A Upper 0.024 106.6 01Jan2010, 12:48 10.50 R2 - A2A Lower 0.250 405.3 01Jan2010, 13:44 125.20 Stdy Pt Al - WS Phillips PWy 0.188 447.9 01Jan2010, 12:50 96.50 Stdy Pt A2 - Castlegate Pwy 0.250 405.3 01Jan2010, 13:13 126.00 Stdy Pt A3 - Confl A2B 0.343 499.8 01Jan2010, 13:38 170.30 Stdy Pt B - Greens Pr * 0.326 654.2 01Jan2010, 12:59 9.07 Total - Both Basins 0.669 1,053.4 01Jan2010, 13:10 9.20 * Note: This HEC -HMS model was prepared in conjunction with the design of Pond A in Section 200 of the Subdivision. Pond B and it's associated outlet structure have not been designed so no attempt has yet been made to reduce Post - Development flowrate to Pre - Development levels. That design will occur with Section 202. POND DATA Pond Peak Storage Max WSEL Spillway Elev Top of Berm ac -ft ft ft ft Castlel- Modified (peak flows) 9.2 309.10 Castlel- Modified (blocked outlet) 12.5 309.80 309.10 310.50 Castle2- North -Pond (Pond A) 8.5 311.70 Castle2- North -Pond blocked outlet 22.3 314.70 314.03 ** 314.03 ** " Note: There is no emergency spillway for this pond. The elevation shown is the low point elevation of WS Phillips Parkway. .....--_ . • all1111111M1111111111111 O .. : .. .....4, 1 i t ....... ,. . ..„. . Ili ___ , , --_........ \ 1 ,.. -, ... ii , (..n ... . , , (II (f) 1 a 7 1 \ \'-.;-----------;- _, o 1 TI > ,$ El > M m r - 0 0 N i , s Z Ar 4. 1 1 i \\ 1) 1 I ■ • on 1 ili x , ,,, — 1 • - -o C11 0 _. VIct orm Avenue 1 1 CD co 4 , — 1 1 i . e I o - 0 M , 1 ..... \ 0 . 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O � 1 A w M O) ' (() CO m t� W V CO '''. N M O M CO N O m l co 60,- I CV co m r n V O O O,_ N O i (n N N (O ,- co H0) O (O O) v N N a 6 CC) W CC) N V 06 6 (6,6 ' I- M M M M N- W W W W m . R N, N ,- O. ,- ,- ,- V 1 C) M V M N e-- V ca CO (O W O co m m N- (O co W W( M M O) m n co ,02,9;; O V W O N co 4 N W (O W n N • Q ,- MIN O� W W N r-: W V V M V V V V M N W W M M v M E a • V V L000100000000,0000010 V O O (O 0 (O 0 W W A 0 0 A 0 0 (O TO TO O O i V A A V V V CO N N V CO CO V 0 w = ri (•i co 0 o co 0 o v V 414 cm m (ri co 6 o0 0o co v M 1 (ri N N M M N N M M M M M. N N N N • E M M M M M M M I M M M M M M M M M M M M M M M M M M M H E N Ce _ , < ti O W Q nl WIt` 4 O W m W M m O N W N- N • M n M O n 0 m 4 W O 7 W N CO C'M V m W h (O CO 1,.. J. A- M N V V ! (O N M V V to N N N M M (O CO V (A W N N V 1 L CI) CL w = M M M M M M M M M M M M M M M M M M M M M M M M M M V/ .� > I -- a 0 Q N. W h h h coo W N VI N (O V CO (Dir. V I W M M O f- W r O V V O O (O M W O W O N W CO N14 CO V (o (o V I� ,- (n N N F O W ,- O N N 4 M V N O O m 01010, _i Cl ,V M V M O O N CO CI O W O N N N N N CO co O N N N N _ C CM CO CO CO CO CO CO CO CO CO CO CO M CO CO i CO 1 CO CO I CO CO CO CO CO CO CO CO X L 1 I Q j II 0, >I% j O O V (O O (O 0 0 0 0 0 0 0 0 : 0 0 0 0 0 L O V 0 . L . 0 0 0 0 W O O LO O O O O (O (O (O O 0,4 V V V W N V V M V V M CO O W v O O V V N' V W W (O CO CO I- W (O (O V (O V 2 M N N M M M M N I I N M M M M M M M M M M M M M M M M M M M M M M M M M M ci CO to (O 1 V CO V co co 0 W N ' (O I O 0 V I� 0 m I f- I m f� f� LOT..- W N O , N A n CO 0 CO CO O' CO j N- co O O O co W m Vim ,- CO (O 1 CO CO J _ � ,- V V V V W W N M V V V 6 (O I CO (O CO (O N V C7 N N N N CM N N 1 M 1 M M M M M M M M M M M M M M MIM M MIM M M M M M M I I Q (O M (O N- N 0)' O O N N M N O V (O (O h V W M M i W v f� (O —corn 0, V O M A- A- A- M O N- M (O N m V CO (O 1 V n N N- 0) W 1 W .-- 1 0 W M M M M C- O m m O O •- M V M M N O A- 0 O i O ., N 0 N N N M' O 0 N N C I M M COI M M M M M M M M M M M M M M M M M M M M M M N C W O 0) (0 (0 0 0) (0 (0 (0 (0 0) (0 (0 (0 CO O . 0 (0 (01 0) 0) (0 0) W H ... M N - M M M, M, M, M. M; III .__.I _ 1 2 N o I I O O 0 0 O O' O (C) N O O � N � N M O V I (n' (O (O W V M M N N, O' O O 0 O N M M M N r I N N N N N N N N 1 N N N N N J II' SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY The Cities of Bryan and College Station both require storm drainage design to follow these Unified Stormwater Design Guidelines. Paragraph C2 of Section III (Administration) requires submittal of a drainage report in support of the drainage plan (stormwater management plan) proposed in connection with land development projects, both site projects and subdivisions. That report may be submitted as a traditional prose report, complete with applicable maps, graphs, tables and drawings, or it may take the form of a "Technical Design Summary". The format and content for such a summary report shall be in substantial conformance with the description in this Appendix to those Guidelines. In either format the report must answer the questions (affirmative or negative) and provide, at minimum, the information prescribed in the "Technical Design Summary" in this Appendix. The Stormwater Management Technical Design Summary Report shall include several parts as listed below. The information called for in each part must be provided as applicable. In addition to the requirements for the Executive Summary, this Appendix includes several pages detailing the requirements for a Technical Design Summary Report as forms to be completed. These are provided so that they may be copied and completed or scanned and digitized. In addition, electronic versions of the report forms may be obtained from the City. Requirements for the means (medium) of submittal are the same as for a conventional report as detailed in Section III of these Guidelines. Note: Part 1 — Executive Summary must accompany any drainage report required to be provided in connection with any land development project, regardless of the format chosen for said report. Note: Parts 2 through 6 are to be provided via the forms provided in this Appendix. Brief statements should be included in the forms as requested, but additional information should be attached as necessary. Part 1 — Executive Summary Report Part 2 — Project Administration Part 3 — Project Characteristics Part 4 — Drainage Concept and Design Parameters Part 5 — Plans and Specifications Part 6 — Conclusions and Attestation STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT Part 1 — Executive Summary This is to be a brief prose report that must address each of the seven areas listed below. Ideally it will include one or more paragraphs about each item. 1. Name, address, and contact information of the engineer submitting the report, and of the land owner and developer (or applicant if not the owner or developer). The date of submittal should also be included. 2. Identification of the size and general nature of the proposed project, including any proposed project phases. This paragraph should also include reference to applications that are in process with either City: plat(s), site plans, zoning requests, STORMWATER DESIGN GUIDELINES Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY or clearing /grading permits, as well as reference to any application numbers or codes assigned by the City to such request. 3. The location of the project should be described. This should identify the Named Regulatory Watershed(s) in which it is located, how the entire project area is situated therein, whether the property straddles a watershed or basin divide, the approximate acreage in each basin, and whether its position in the Watershed dictates use of detention design. The approximate proportion of the property in the city limits and within the ETJ is to be identified, including whether the property straddles city jurisdictional lines. If any portion of the property is in floodplains as described in Flood Insurance Rate Maps published by FEMA that should be disclosed. 4. The hydrologic characteristics of the property are to be described in broad terms: existing land cover; how and where stormwater drains to and from neighboring properties; ponds or wetland areas that tend to detain or store stormwater; existing creeks, channels, and swales crossing or serving the property; all existing drainage easements (or ROW) on the property, or on neighboring properties if they service runoff to or from the property. 5. The general plan for managing stormwater in the entire project area must be outlined to include the approximate size, and extent of use, of any of the following features: storm drains coupled with streets; detention / retention facilities; buried conveyance conduit independent of streets; swales or channels; bridges or culverts; outfalls to principal watercourses or their tributaries; and treatment(s) of existing watercourses. Also, any plans for reclaiming land within floodplain areas must be outlined. 6. Coordination and permitting of stormwater matters must be addressed. This is to include any specialized coordination that has occurred or is planned with other entities (local, state, or federal). This may include agencies such as Brazos County government, the Brazos River Authority, the Texas A &M University System, the Texas Department of Transportation, the Texas Commission for Environmental Quality, the US Army Corps of Engineers, the US Environmental Protection Agency, et al. Mention must be made of any permits, agreements, or understandings that pertain to the project. 7. Reference is to be made to the full drainage report (or the Technical Design Summary Report) which the executive summary represents. The principal elements of the main report (and its length), including any maps, drawings or construction documents, should be itemized. An example statement might be: "One -page drainage report dated , one set of construction drawings ( sheets) dated , and a -page specifications document dated comprise the drainage report for this project." STORMWATER DESIGN GUIDELINES Page 2 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 Start (Page 2.1) Engineering and Design Professionals Information En ine ing Firm Name and Address: Jurisdiction P�j ,'/ S Eh l n ee r / City: Bryan yyg0 �Ca S aTe / / v+` College Station Co /Ie e 5/4 1( D h 7 79 ys- Date of ub ittal: Lead Engineer's Name and Contact lnfo.(ho e, it fax): � r , Ce \ Other: 6470- /lenf la2q' kI/AZq�Q hrh� sen /freer- /n1 JCS • �'D/n Supporting Engineering / Consulting Firn(s): • Other codtacts: Developer / Owner /'Applicant Information Deveelop r / Applicant Name nd A 1 c 1 ss: Phone and a -ma : c v e . men /C (� 6 9'O - 7 2 S`C1 Iddal / ace /41i walla( E � ) e. Ii / /� S - er zo9. /l ei - ^ Stye Cat / e q/e /Jr,'ve C� 778 - y! 'l„ll,,s .t2 y4 tipm_ r.ar,-, Property Owner(s) if not Developer / Applicant (& address): Phone and e-mail: Project Identification Development Name: Q9 -/e &de E Is subject property a site project, a sin` -phase subdivision, or part of a multi -phase Subdivision? P20/ * - o tigSe If multi - phase, subject property is phase / — of / 7 . Legal description of subject property (phase) or Project Area: (see Section II, Paragrap B -3a) y / J vfn 14./ / e S o Cc? 5 k/erl e- Sc/ l� rt a yr s /os7 r h I /i c / V I ✓) 1 ,, /( VICTor/ gi 4 ve yn c/� 6, ree »s /4 / v1_ e e / G'li/CIG / /td fe4 cies (' » 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. l s� / Se General Location of Project Area, or subject property (phase): See above In City Limits? Extraterritorial Jurisdiction (acreage): Bryan: acres. Bryan: College Station: College Station: 27. 17 acres. Acreage Outside ETJ: STORMWATER DESIGN GUIDELINES Page 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) Project Identification (continued) Roadways abutting or within Project Area or Abutting tracts, platted land, or built subject / property: / . 1 development: VI Cio / a liven Ccr 5 1 Ieg a-1..e �C7'io Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): I Cree R2 Plat Information For Project or Subject Property (or Phase) Plat File #: Final Plat File #: Date: Name: C,gsfle Status and Vol /Pg: If two plats, second name: File #: Status: Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: H xistin or Proposed? Case Code: Case Date Status: Zoning Type: Existing or Proposed? Case Code: Case Date Status: Stormwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s) & Date(s): Participants: Preliminary Report Required? /Ud) Submittal Date Review Date Review Comments Addressed? Yes No In Writing? When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Prel Drainage Report, if any. STORMWATER DESIGN GUIDELINES Page 4 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 2.3) 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 Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non - jurisdiction City Needed? Yes No t/ Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes No 1- Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? Yes No 1/ Coordination with Summarize need(s) & actions taken (include contacts & dates): TAMUS Needed? Yes No V 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 Status of Actions include dates) ? Actions ( include US Army Crops of CQ rr.¢ n //i 13 el e V a /trai �� �e rm ' " Engineers n e % n f l c 41ibn /s ea yor- C ° m l # // r1� _// � // N /� 1/ ? / ,o . No Yes ,/ L/ l t J tT 1 i /UT �on / �/'m� / � 4 13 un�ol�terS US Environmental Protection Agency No V Yes Texas Commission on Environmental Quality /�0�c o =n / /en 7 1 se No Yes V Brazos River Authority No i/ Yes STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Start (Page 3.1) Nature and Scope of Proposed Work Existing: Land proposed for development currently used, including extent of impervious cover? Site Redevelopment of one platted lot, or two or more adjoining platted lots. Development Building 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): Subdivision Construction of streets and utilities to serve one or more platted lots. Development L— nstruction 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 RO Size of 147 Si'n Ie 'F ik 1!Is Proposed /q� p 0 a Siree�� Project Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? �No Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse No Yes (Section II, Paragraph B1) or a tributary thereof? Is any part of subject property in floodplain No Yes f Rate Maps rl n C, /� re o �C area of a FEMA- regulated watercourse? Encroachment(s) Encroachment s ur ose : Building site into Floodplain p p () 9 s () Road crossing(s) areas planned? Utility crossing(s) Other (explain): No 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. 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 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 S h copy if not alpead / i n City files. h'. Moore What s/ 0 4 i Vreel� Q Q/ aeco✓v! an i� - 1.0 � y � Is the stormwater management plan for the property in substantial conformance with the earlier study? Yes ✓ No If not, explain how it differs. No If subject property is not part of multi -phase project, describe stormwater management plan for the property in Part 4. If property is part of multi -phase project, provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. Do existing topographic features on subject property store or detain runoff? 17-No Yes Describe them (include approximate size, volume, outfall, model, etc). Any known drainage or flooding problems in areas near subject property? V No Yes Identify: Based on location of study property in a watershed, is Type 1 Detention (flood control) needed? (see Table B -1 in Appendix B) Io Detention is required. Need must be evaluated. Detention not required. What decision has been reached? By whom? If the need for 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) ; c � i ' o n 2.00 ; goes not Lt Does subject property straddle a Watershed or Basin divide? V No Yes If yes, / Di describe splits below. In Part 4 describe design concept for handling this. �` g v h d ] r v, K Watershed or Basin Larger acreage Lesser acreage C/o$SeS OQSc .1 S ,Drl nq Ci - e K 12.2 aE kooelrlcerir s A 01i Cre SD ac Above - Project Areas(Section II, Paragraph B3 -a) Does Project Area (project or phase) receive runoff from upland areas? No ✓Yes Size(s) of area(s) in acres: 1) /lo. Sac 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), small creek (non - regulatory), regulatory Watercourse or tributary); DV'er Shaest R Flow determination: Outline hydrologic methods any as um tion e P Sf 1, l/ C Nets Con ,1 ->>1 ode 1 . ee en l.or reDorj or dela•'Is . Does storm runoff drain from public easements or ROW onto or across subject property? V No Yes If yes, describe facilities in easement or ROW: Are changes in r noff h racteristi subject to change in future? Explain n , 4J/ ./1 t * wh ,e -e u ve /, me•i D ± o „ , o ac aY s ' aft ci Se CA d., .200 v /an e l arm s /h e s'ov -i' J will / oc) /01° -✓4vre / »JaSe -s. Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property dr n across lower properties before reaching a Regulatory Watercourse or tributary? V No Yes Describe length and characteristics of each conveyance pathwa / y(s). / //J Include ownership of / Pr rty(ies). Cr' /c 424 ,.7en /$ 14ro(/ h C-as}le,e I Seca, yn 2° 0 Pr,n (_ee / ec7i�n /- 0,4)er /'cam S cA9 /BOSS -"{h rou h exi'sIi S e j f1 $ o � / J (psi /egqo7/e .S; v r's (eh ,e4 w/ 9er e ea e'n 5 av Lee" CJreoI c «Tea l . STORMWATER DESIGN GUIDELINES Page 8 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 3.4) 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. C .5 fe� ale exist for any part of Car )od5 See s) pathway(s)? No des Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired ?) l oAlee ,oroptr41e5 r�, cladI Cct -1 /ey - f - e an di Pathway C /C S c. b�e' v�'ss0✓! S. S ,pt j C Ti'L Areas a s�1 e /"v c � D/ / LS - f 2 � ieyls7 nq aldler'cov5 e, / ado/ ! ,, ia l Ccrsem ehis or cgn s e is re iv, .i•e Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). C u lverj- oiler DI Ai 0. Nearby Drainage Do any of thesOiave hydrologic or hydraulic influence on proposed stormwater Facilities design? V No Yes If yes, explain: STORMWATER DESIGN GUIDELINES Page 9 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 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 ar a, flow section, or discharge point. RU4.0 1 -C, �!, /,, Jed a real e S 40-1- ca/�Tf/re-01 Oc Co,17, -o I1-e 6dIT�"L - 7 1- 1) I' � 1 h as 4/eVe(9 /0 C' m _ e / m P n IS Po # / e C77 %G/ 14 a i' -� r s ire K /I ort • T 7L j 4�e7 - en �Ion on of uj II be 0'0 ole W I h - fv�urc ,dhsS�S �s7� w (1/ a CC o �1 -f'ro•r s tor 4,, 0/ Are Discharge(s) T ower roperty(ies) (Section II, Paragraph E1) �11 I Does project include drainage features (existing or future) proposed to become public via /VO add, , l a / platting? Yes Separate Instrument? No Yes 4 a-iv Per Guidelines reference above, how will Establishing Easements (Scenario 1) / runoff be discharged to neighboring Pre - development Release (Scenario 2) cJ OW/) 5 'rea ✓r .. property(ies)? Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit # ) Scenario 2: Provide general description of how release(s) will be managed to pre - development conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit # ) Combination: If combination is proposed, explain how discharge will differ from pre - development conditions at the property line for each area (or point) of release. If Scenario 2, or Combination are to be used, has proposed design been coordinated with owner(s) of receiving property(ies)? No Yes Explain and provide documentation. STORMWATER DESIGN GUIDELINES Page 10 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 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result in shifting runoff between Basins or between What design and mitigation is used to compensate for increased runoff Watersheds? from gaining basin or watershed? V No Yes How will runoff from Project 1. With facility(ies) involving other development projects. Area be mitigated to pre- 2 t0 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 Over II Project Area (type & location of facili 'es : (Att9ched Exhibit # ) mo��' /c..f( 7 e)ci'5A deten i on /? a, 4' af►v c heuJ delen r Prl po4 � O� - s� T� . See a ec orntrcr /0/ /// con57lrvc- j / n5. 3. By phase (or site) project. Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. Are aquatic echosystems proposed? No Yes In which phase(s) or project(s)? c- a> v, } Are other Best Management Practices for reducing stormwater pollutants proposed? a No Yes Summarize type of BMP and extent of use: rn o Z If design of any runoff - handling facilities deviate from provisions of B -CS Technical Specifications, check type facility(ies) and explain in later questions. co Detention elements Conduit elements Channel features Swales Ditches Inlets Valley gutters Outfalls Culvert features Bridges Other STORMWATER DESIGN GUIDELINES Page 11 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 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? No l/ Yes Identify type and /� < general size and In which phase(s). the ocJT �`� G x 3' bo Iver- c,> c '`� Se r ve u s t. Krr`/ cross Cel / �1r Ai al. QQr ;de ��e e h po ►� v� Y If detention /rete~ntion serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): The ,�(e'f'en7r'on 4on ,- Seel/ s 100 -107 anol 200 - 01 / c N s / r ✓ c e- d w ! f 11)/.5* / �J! v) c t - TS 0 v I�`�+ / / e /SQpe14_ c ,-7-1 1,17 '' o7 r on 7 „aT i s 2r� I�'!o••/� r�a1 % s e ti C s t . e 0Ie � �r�, Sr�� Within Or Serving Subject Pro (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier analysis and report for larger area? Yes No, then summarize the difference(s): TIP'S / S fn e — Cr - $ I ,/]A a S e. Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? �. 2 Steepest side slopes: Usual front slopes: Usual back slopes: a) Flow line slopes: least Typical distance from travelway: a (Attached Exhibit # typical greatest - 0 I ° Are longitudinal culvert ends in compliance with B -CS Standard Specifications? Yes No, then explain: At intersections or otherwise, do valley gutters cross arterial or collector streets? No Yes If yes explain: � • U a� Are valley gutters proposed to cross any street away from an intersection? o ✓No Yes Explain: (number of locations ?) EEmz Th N to STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes: Least O. bD 7;9 Usual 1, 2 Greatest 2. q % Are inlets recessed on arterial and collector streets? 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)? V Yes No If no, explain where and why not. c-. a) z Will inlet size and placement prevent exceeding plowable water spread for 10 -year a) design storm throughout site (or phase)? Yes No If no, explain. ' rn C0 5 Saa curves: Are inlets placed at low points? 'Yes No Are inlets and conduit sized to prevent 100 -year stormflow from ponding at greater than 24 inches? U c c) 1/Yes No Explain "no" answers. 3 a) a) U) U) 2 Will 100 -yr stormflow be contained in combination of ROW and buried conduit on Q whole length of all streets? 1- Yes No If no, describe where and why. Do dOgns for curb, gutter, and inlets comply with B -CS Technical Specifications? V Yes No If not, describe difference(s) and attach justification. Are any 12 -inch laterals used? V'No Yes Identify length(s) and where used. 3 Pipe runs between system Typical ti // X lop . Longest 403 N 3 } access points (feet): a ) Are junction boxes used at each bend? 1,4 No If not, explain where >, and why. 0) C • o �Z E o Are downs ream soffits at or below upstream soffits? Least amount that hydraulic N Yes 1/ 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 watercourse(s), or system(s) receiving system discharge(s) below (include design discharge velocity, and angle between converging flow lines). co 1) WI S4o aterc urse (ors tem) velocity, and gle Se c � v �J .004411 (� // r'rrm ral // r n s n n/ )� 2 D 0` i r r o c deJevS, o n m h 0/ . /2 Dn e 50 GIli 1'17 I a i d; E 2) Watercourse (or system), velocit y, and angle? wafer coarse c c O s- o C E - 3) Watercourse (or system), velocity, and angle? r' U) >' � (1) . 0 o -0 n E -- For each outfall above, what measures are taken to prevent erosion or scour of ( r receiving and all facilities at juncture? 1) f6 n 2) a> `0 0 3) Are swale(s) situated along property lines between properties? No Yes Number of instances: For each instance answer the following questions. Surface treatments (including low -flow flumes if any): �. a) In' } Flow line slopes (minimum and maximum): 0 0 Outfall characteristics for each (velocity, convergent angle, & end treatment). a m ) v, a� . Will 100 -year design storm runoff be contained within easement(s) or platted drainage ROW in all instances? Yes No If "no" explain: STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Are roadside ditches used? No Yes If so, provide the following: a) Is 25 -year flow contained with 6 inches of freeboard throughout ? Yes No 0 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 3, For any "no" answers provide location(s) and explain: CO 0 ct 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 If "no" explain: a`) O m Space for 100 -year storm flow? ROW Easement Width \ c Swale Surface type, minimum Conduit Type and size, minimum and maximum 1 c and maximum slopes: slopes, design storm: 0 c- a a, m Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): c T c c co c — O o Access Describe how maintenance access is provided (to swale, into conduit): is o E 0 a) 0 c •E .0 Instance 2 Describe general location, approximate length: a E a) m c Is 100 -year design flow contained in conduit/swale combination? Yes No 2. o If "no" explain: m n c E a Space for 100 -year storm flow? ROW Easement Width 0 ") Swale Surface type, minimum Conduit Type and size, minimum and maximum 5 m and maximum slopes: slopes, design storm: c (6 2 Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): a) m c 0) it-) 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 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: x o w Is 100 -year design flow contained in swale? Yes No Is swale wholly c } within drainage ROW? Yes No Explain "no" answers: a) ° o ' Access Describe how maintenance access is provide: o 3�Z a I 0 0 Instance 2 Describe general location, approximate length, surfacing: a m L c'' c 5' a) o E 3 m Is 100 -year design flow contained in swale? Yes No Is swale wholly a within drainage ROW? Yes No Explain "no" answers: o N 0 Access Describe how maintenance access is provided: U Q 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 chan9elized (deepened, widened, or straightened) or otherwise altered? No 1/Yes If only slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. a c Will design replicate natural channel? Yes No If "no ", for each instance ( 13 `—° describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year o w design flow, and amount of freeboard: / / w/ �� �� Instance 1: -II e c O/ O 5 e (kyle 74 et pd2ne Y (1. Con ri,c y Or) the 'ley' -f aT �`r /po S S v / f � e �a e � Gv /' f° Instance 2: f`1r 9" �° / ° J �o a'4 e r 0 / • 1 , N I nstance 3: CA an e- /i 7 al / ot/i 1 S unit c7 STORMWATER DESIGN GUIDELINES Page 16 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 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels (small creeks): Are these used? No V Yes If "yes" provide the information below. Will small creeks and their floodplains remain undisturbed? Yes No How many disturbance instances? Id ntify each planned location: ROD Q�C cav G / - t See COi? sir dC7< /aa IcD d1 / For each location, describe length and general type of proposed improvement (including floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year design flow. a) Watercourses (and tributaries): Aside from range changes, are Regulatory Watercourses proposed to be altered? V No Yes Explain below. Submit full report describing proposed changes to Regulatory Watercourses. Address °' • existing and proposed section size and shape, surfaces, alignment, flow line changes, • length affected, and capacity, and provide full documentation of analysis procedures • and data. Is full report submitted? Yes No If "no" explain: n E m All Proposed Channel Work: For all proposed channel work, provide information • requested in next three boxes. If design is to replicate natural channel, identify location and length here, and describe design in Special Design section of this Part of Report. Will 100 -year flow be contained with one foot of freeboard? t/'Yes No If not, identify location and explain: Are ROW / easements sized to contain channel and required maintenance space? Yes No If not, identify location(s) and explain: / 1 (L /Vo e aSemenrfs- Oeedp t 4.€ ■,1014 ?011 Pol y /1O /• STORMWATER DESIGN GUIDELINES Page 17 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 4.9) 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? 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: U i Facility 2: 5y6 #9" kr r Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: Yes No Facility 2: Yes No --0 If "no" explain: a) 0 0 0 0 a For each, what is velocity of 25 -yr design discharge at outlet? & at spillway? a Facility 1: & Facility 2: & 'e) Are energy dissipation measures used? No Yes Describe type and u.. location: c 0 a) II 0 m For each, is spillway surface treatment other than concrete? Yes or no, and describe: Q Facility 1: Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Facility 2: If berms are used give heights, slopes and surface treatments of sides. Facility 1: Facility 2: STORMWATER DESIGN GUIDELINES Page 18 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 4.10) Stormwater Management Concept;, (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Do structures comply with B -CS Specifications? Yes or no, and explain if "no ": Facility 1; a) L c Facility 2: o c ." o c U • 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: c- rn o Are culverts parallel to public roadway alignment? Yes No Explain: • N ra n Creeks at Private Drives: Do private driveways, drives, or streets cross drainage ways that serve Above - Project areas or are in public easements/ ROW? N z° No Yes If "yes" provide information below. How many instances? Describe location and provide information below. Location 1: U 22 Location 2: Location 3: For each location enter value for: 1 2 3 Design year passing without toping travelway? Water depth on travelway at 25 -year flow? Water depth on travelway at 100 -year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Page 19 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 4.11) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulatory Waterc9 urses (& Tributaries): Are culverts proposed on these facilities? No V Yes, then provide full report documenting assumptions, criteria, analysis, computer program -and study findings that support proposed design(s). Is report provided? V Yes No If "no ", explain: ac Arterial or Major 9pllector Streets: Will culverts serve these types of roadways? c No ■/ Yes How many instances? 1 For each identify the a , location and provide the information belovy. 2 iii 1: (Q5 P // 1/ ;n 3 I rlc w4 y °' Instance 2: / I c o Instance 3: c 0 o Ti Yes or No for the 100 -year design flow: 1 2 3 z E `O Headwater WSE 1 foot below lowest curb top? JJ /1 !e S criii �� �, Spread of headwater within ROW or easement? Ye S pa 4 11 E rn ° Is velocity limited per conditions (Table C -11)? ye s J .c c ea Explain any "no" answer(s): o c U O (0 0 0 -0 a) o 42 Minor ollector or Local Streets: Will culverts serve these types of streets? n No Yes How many instances? for each identify the = -0 location and provide the information below: nay m Instance 1: y c Instance 2: o Instance 3: = • U) 2 0 For each instance enter value, or "yes" / "no" for: 1 2 3 = c m ° Design yr. headwater WSE 1 ft. below curb top? < .; 100 -yr. max. depth at street crown 2 feet or less? E Product of velocity (fps) & depth at crown (ft) = ? Is velocity limited per conditions (Table C -11)? Limit of down stream analysis (feet)? Explain any "no" answers: STORMWATER DESIGN GUIDELINES Page 20 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 4.12) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway /roadside ditch intersects) provide information requested in next eigh boxes. Do culverts and travelways intersect at 90 degrees? V Yes No If not, identify location(s) and intersect angle(s), and justify the design(s): Does drainage way align nt change within or near limits of culvert and surfaced approaches thereto? V No Yes If "yes" identify location(s), describe change(s), and justification: Are flumes or conduit to discharge into culvert barrel(s)? 17No Yes If yes, identify location(s) and provide justification: Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? No Yes If "yes" identify location(s), describe outfall design treatment(s): z 0 0 N Is scour /erosion protection provided to ensure longifm stability of culvert structural components, and surfacing at culvert ends? V Yes No If "no" Identify locations and provide justification(s): Will 100 -yr flow and spread of backwater be fully contained in street ROW, and /or drainage easements/ ROW? ✓ Yes No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstrepi to neighboring land(s) not encompassed in subject property? No V Yes If "yes" describe location(s) an itigation measures: ,E S11 rl q de n rend d o wn s ii ,r Orr) f 5 h ¢ •� o d, - r da" , 1 Co o Q - i & er -now tro, -i � dr° se o f 19 oral. Are all culvert designs and materials in compliance with B -CS Tech. Specifications? ✓Yes No If not, explain in Special Design Section of this Part. STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 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) Is a bridge included in plans for subject property project? V to Yes If "yes" provide the following information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? a) rn A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? Yes No If "no" explain: Is a Stormwater Provide a general description of plann d tech niques: Pollution Prevention Co y)1 + c, e I/o n en 1riAh « /e x / , T // n ftt / �e I established for t o epl & °e , Se Z/ r r, 4 v s e �, project construction? p S ? � ' heQOlPO� is 5 No Yes Special Designs — Non - Traditional Methods Are any non - traditional methods (aquatic echosystems, wetland -type detention, natural stream repltion, BMPs for water quality, etc.) proposed for any aspect of subject property project? No Yes If "yes" list general type and location below. Provide full report about the proposed special design(s) including rationale for use and expected benefits. Report must substantiate that stormwater management objectives will not be compromised, and that maintenance cost will not exceed those of traditional design solution(s). Is report provided? Yes No If "no" explain: STORMWATER DESIGN GUIDELINES Page 22 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 4.14) 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 Inlets Outfalls Valley gutters Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviation(s). Specific Detail Element Justification for Deviation (attach additional sheets if needed) 1) 2) 3) 4) 5) Have elements been coordinated with the City Engineer or her /his designee? For each item above provide "yes" or "no ", action date, and staff name: 1) 2) 3) 4) 5) Design Parameters Hydrology Is a map(s) showing all Design Drainage Areas provided? /Yes No Briefly summarize the range of applications made of the R Tonal Formula: / R C7T , o n 1 - r r» / is / S t) S PGf r- v 4 '7 d i4 Y i m n s If VO IV/ 5 I0 rv, ar-G1rh Si ZeS and i4 /e 5 What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 2,77 acres Location (or identifier): I n l e t- 2,/i STORMWATER DESIGN GUIDELINES Page 23 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 4.15) Design Parameters (continued) Hydrology (continued) In making deterr nations for time of concentration, was segment analysis used? No V Yes In approximately what percent of Design Drainage Areas? /00 % As to intensity- duration - frequency and rain depth criteria for determi ing runoff flows, were any criteria other than those provided in these Guidelines used? V No Yes If "yes" identify type of data, source(s), and where applied: For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked), and that used as the basis for design. Feature Analysis Year(s) Design Year Storm drain system for arterial and collector streets /0 /Do 10 Storm drain system for local streets /0 100 1p Open channels Swale /buried conduit combination in lieu of channel Swales Roadside ditches and culverts serving them Detention facilities: spillway crest and its outfall /n D / 00 Detention facilities: outlet and conveyance structure(s) 00 /00 Detention facilities: volume when outlet plugged / 0 0 / 0 0 Culverts serving private drives or streets Culverts serving public roadways Bridges: provide in bridge report. Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit Culverts Swales Channels Highest (feet per second) 2.61 7. D3 Lowest (feet per second) ', 8 a6 Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For street gutters: 1') = �� 2. q For conduit type(s) /MCP ri) PF Coefficients: . 0 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 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? ✓ No Yes Head and friction losses ►VNo Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? ✓Yes No Are elevation drops provided at inlets, manholes, and junction boxes? ,Yes No Explain any "no" answers: Are hydraulic grade lines calculate5And shown for design storm? V Yes No For 100 -year flow conditions? Yes No Explain any "no" answers: 'Ira cxot6 1 L What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: f Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? Yes No Outside of straight sections, is flow regime within limits of sub - critical flow? 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 desi n discharge, will operation pe outl t (arr I) control or inle contro Ti. re orr / c l ver-f is 1 valerih n o, out-2. //. /'�oy� an v mc, / Conic o ccu r u� � or f,4e WS CAanGes Entrance, friction and exit losses: Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software has been used in the analysis and assessment of stormwater management needs and /or the development of facility designs proposed for subject property project? List them below, being sure to identify the software name and version, the date of the version, any applicable patches and the publisher NEC l inS 3.3 / gio (AD 2 011 w/ C�'v�' 3,0 l'hidrai ! /ow /�acko Part 5 — Plans and Specifications Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section III, Paragraph C3. Part 6 — Conclusions and Attestation Conclusions Add any concluding information here: Attestation Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Design Summary Drainage Report by signing and sealing below. "This report (plan) for the drainage design of the development named in Part B 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 agenc " - - 'f. ' . • •osed drainage improvements have been issued or fall under applicable ge • : •� a . •� (A S 4- KENT M LAZA .. • .. Licensed Professional En7 eer 65923 $ State of Texas PE No. 2 ..EN • • • pa S oN • EN 3 STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009