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Home My WebLink AboutDrainage ReportDRAINAGE REPORT FOR BRIDGEWOOD SUBDIVISION N ¢ �P S L L I ii I PREPARED FOR: BCS DEVELOPMENT CO. 4090 STATE HWY 6 SOUTH COLLEGE STATION, TX 77845 979-690-1222 April 2014 Revised June 2014 Revised July 7, 2014 MBESI No.10530014 L L� McCLURE & BROWNE ENGINEERING/SURVEYING, INC. 1008 Woodoreek Dr„ Suite 103 College Station, Tx. 77845 • (979) 693-3038 Engineer Reg. No. F-458 Survey Reg. No. 101033-00 Bridgewood Subdivision Stormwater Management Technical Design Summary Report DIBESI #1053-0014 PART 1— Executive Summary Report Section 1 — Contact Information: Project Designer: McClure and Browne Engineering and Surveying, Inc. 1008 Woodcreek Drive, Suite 103 College Station, TX 77845 Project Developer: BCS Development Company 6090 State Highway 6 South College Station, TX 77845 Submittal Date: April 2014 Section 2 — General Information: The Bridgewood Subdivision is a master planned community to be constructed in south College Station. The total area of the development is approximately 61 acres with a total of 120 lots. The plan is based on the currently approved Preliminary Plat for this development. Section 3 — Project Location: The Bridgewood Subdivision is located in south College Station near the intersection of Barron Road and William D. Fitch Pkwy. The entire project site is located within the city limits of College Station. The entire site is located within the Spring Creek Drainage Basin. No portion of the site is shown to be within the 100-year floodplain. (Fema Firm Map # 48041 C0325E, May 16, 2012). Section 4 — Hvdrologic Characteristics The project site is mostly trees and underbrush with the heaviest concentrations of vegetation being near the creek. Spring Creek runs through the middle of the site. The site drains to Spring Creek.. There are no existing drainage easements or ROW on the property. Section 5 — Stormwater Management: Stormwater will be conveyed by curb and gutter to recessed inlets. The Stormwater will be discharged directly into the existing creek or one of the proposed detention ponds. Proper end treatments and riprap stabilization will be used to prevent erosion. The detention ponds will be designed as retention type ponds with a constant water level. The upper pond is much larger and provides the bulk of the detention storage. The connection between the two ponds will be designed as a `water fall' feature that will have a constant stream of water. The channel will be concrete lined with river rock grouted above the concrete. The following are the characteristics of each pond: Stormwater Management Technical Design Summary Report Bridgewood Subdivision Pond #1 Water Surface Elevation = 307.0 Top of Berm = 312.0 Discharge Spillway = 20' Trapezoidal Concrete Maximum Storage Volume =9.90 ac-fit 100-year Volume = 8.30 ac-ft Pond #2 Water Surface Elevation = 305.0 Top of Berm = 310.0 Discharge Spillway = 25' Trapezoidal Concrete Maximum Storage Volume= 1.15 ac-ft 100-year Volume = 0.7 ac-ft Detention Pond Anal sis Pond #1 Pond #2 Storm Event cfs) W.S. Elevation Q (cfs) W.S. Elevation 2-year 140.6 308.7 140.5 306.5 5-year 240.5 309.5 240.5 307.2 10- ear 337.0 310.1 337.0 307.7 25-year 407.7 310.6 407.7 308.1 50-year 471.1 310.9 470.9 308.4 100-year 547.3 311.4 547.3 308.7 Study Point A Analysis Storm Event Ex. Point A (cfs) Prop. Point A (cfs) 2-year 192.9 161.3 5-year 325.1 266.9 10- ear 447.1 372.2 25-year 538.0 451.4 50-year 6213 521.8 100-year 721.9 606.8 Section 6 - Coordination and Permitting: No coordination or permitting is required for this development. Section 7 - Reference: Report Technical Design Summary Report Exhibit A Drainage Area Map (HEC-HMS) Exhibit B Drainage Area Map (Storm Drain) Exhibit C-1 Rational Formula Drainage Area Calculations Exhibit C-2 Inlet Computations Exhibit C-3 Pipe Size Calculations Exhibit D-1 Drainage Area Parameters Exhibit E-1 Retention Pond #1 Design Calculations Exhibit E-2 Retention Pond #2 Design Calculations Exhibit F HEC-HMS Results Stormwater Management Technical Design Summary Report Bridgewood Subdivision 2-Year Results Project: 2014 Detention 2 Simulation Run: 2 Year Start ofRun: 303an2007, 00:00 Basin Model: Bridgewood - End of Run: 313an2007, 00:30 Meteorologic Model: 2 Year Compute Time: 073u12014, 10:20:09 Control Specifications: Control 1 Show Elements: All Elements Volume Units: # IN C) AC -FT Sorting: Hydrologic . Hydrologic Element Drainage Area (MI2) Peak Dlscharge (CFS) Time of Peak volume ON Prop Culverts 0.2469 118.0 303an2007, 13:10 2.17 Culvert IRouting 0.2469 112.6 301an2007, 13:22 2.17 Prop Culvert 2 0.0578 48.3 303an2007, 12:32 2.37 Culvert 2Routing 0.0578 42.6 303an2007, 12:42 2.34 Proposed Pond Area 0.0300 44.2 303an2007, 12:20 3.83 Wet Pond 1 0.3347 140.6 303an2007, 13:24 2.34 Wet Pond 2 0.3347 140.5 303an2007, 13:26 2.34 Prop Bypass 1 0.0700 103.4 303an2007, 12: 18 3.62 Prop PtA 0.4047 161.3 303an2007, 12:30 2.56 Ex Culvert 1 0.2469 118.0 301an2007, 13:10 2.17 Existing Bypass 1 0.0700 54.3 303an2007, 12:28 2.05 Ex Culvert 0.0578 48.3 303an20D7, 12:32 2.37 Existing Pond Area 0,0300 26.8 303an2007, 12:22 2.15 Ex PtA 0,4047 192.9 301an2007, 12:38 2.18 5-Year Results Project: 2014 Detention 2 Simulation Run: 5 Year Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007,00:30 Meteorologic Model: 5Year Compute Time: 07Ju12014, 10:20:00 Control Specifications: Control 1 Show Elements: All FJements Volume Units: CO) IN AC -FT Sorting: Hydrologic . Hydrologic Hement Drainage Area (MI2) Peak Discliarge (CFS) Time of Peak volume (IN) Prop Culvert 1 0,2469 197.3 303an2007, 13:08 3.59 Culvert 1Routing 0.2469 192.7 303an2007, 13:16 3.58 Prop Culvert 0.0578 78.6 303an2007, 12:30 3.82 Culvert 2Routing 0.0578 71.9 303an2007, 12.40 3.79 Proposed Pond Area 0.0300 63.2 303an2007, 12:20 5.48 Wet Pond 1 0.3347 1 240.5 30Jan2007, 13:14 3.78 Wet Pond 2 0.3347 240.5 30Jan2007, 13:16 3.78 Prop Bypass 1 0.0700 149.9 30Jan2007, 12:18 5.26 Prop Pt 0,4047 266.9 30Jan2007, 13:08 4.03 Ex Culvert 1 0.2469 197.3 303an2007, 13:08 3.59 Existing Bypass 1 0.0700 92.4 303an2007, 12:28 3.45 Ex Culvert 2 0.0578 78.6 30Jan2007, 12:30 3.82 Existing Pond Area 0.0300 45.0 30Jan2007, 12:22 3.56 Ex PtA 0.4047 325.1 3OJan2Oo7, 12:36 3.60 1 Stormwater Management Technical Design Summary Report Bridgewood Subdivision 10-Year Results Projed: 2014 Detention 2 Simulation Run: 10 Year StartofRun: 30]an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 10 Year Compute Time: 071u12014, 10:00:02 Control Specifications: Control 1 Show Elements: All Elements Volume Units: (6,) IN C) AC -FT Sorting: Hydrologic . Hydrologic Element Drainage Area (MI2) Peak Disdiarge (CFS) Tlme of Peak Volume (IN) Prop Culvert 1 0.2469 270.3 30Jan2007, 13:08 4.92 Culvert 1 Routing 0.2469 268.3 30Jan2007, 13:12 4.91 Prop Culvert 2 0.0578 106.3 30Jan2007, 12:30 5.18 Culvert 2Routing 0.0578 97.8 30Jan2007, 12:40 5.14 Proposed Pond Area 0.0300 79.9 303an2007, 12:20 6.96 Wet Pond 1 0.3347 337.0 301an2007, 13:12 5.11 Wet Pond 2 0.3347 337.0 303an2007, 13:12 5.11 Prop Bypass 1 0.0700 190.9 303an2007, 12:18 6.72 Prop Pt 0.4047 372.2 30Jan2007, 13:08 5.39 Ex Culvert 1 0,2469 270.3 303an2007, 13:08 4.92 E:dsting Bypass 1 0.0700 127.5 303an2007, 12:28 4.76 Ex Culvert 2 0.0578 106.3 303an2007, 12:30 5.18 Existing Pond Area 0.0300 61.7 303an2007, 12:22 4.89 Ex PtA 0.4047 447.1 303an2007, 12:36 4.92 25-Year Results Project: 2014 Detention 2 Simulation Run: 25 Year StartofRun: 303an2007,00:00 Basin Model: Bridgewood End of Run: 333an2007,00:30 Meteorologic Model: 25Year Compute Time: 073u12014, 10:00:06 Control Specifications: Control 1 Show Fements: All FJements . Volume Units: (o) IN O AC -Fr Sorting: Hydrologic . Hydrologic Element Drainage Area (M12) Peak Discharge (CFS) Time of Peak Volume (IN) Prop Culvert 1 0.2469 324.6 301an2007, 13:06 5.91 Culvert IRouting 0.2469 322.4 303an2007, 13:12 5.90 Prop Culvert 0,0578 126.8 303an2007, 12:30 6.20 Culvert 2Routing 0.0578 116.9 30]an2007, 12:38 6.16 Proposed Pond Area 0.0300 92.1 30]an2007, 12:20 8.04 Wet Pond 1 0.3347 407.7 301an2007, 13:08 6.12 Wet Pond 2 0.3347 407.7 303an2007, 13:10 6.12 Prop Bypass 1 0,0700 221.0 303an2007, 12:18 7.80 Prop Pt A 0.4047 451.4 301an2007, 13:04 6.41 Ex Culvert 1 0.2469 324.6 303an2007, 13:06 5.91 Existing Bypass 1 0.0700 153.6 303an2007, 12:28 5.76 Ex Culvert 2 0.0578 126.8 303an2007, 12:30 6.20 Existing Pond Area 0.0300 74.2 303an2007, 12:22 5.89 Ex Pt A 0.4047 538.0 30]an2007, 12:36 5.93 Stormwater Management Technical Design Summary Report LJ Bridgewood Subdivision 50-Year Results Project: 2014 Detention 2 Simulation Run: 50 Year Start of Run: 30Jan2007, 00:00 Basin Model: Bridgewood End of Run: 31Jan2007, 00:30 Meteorologic Model: 50 Year Compute Time: 07302014, 10:00: 10 Control Specifications: Control 1 Show Elements: All Elements Volume Units: O IN O AC -Fr Sorting: Hydrologic . Hydrologic Element Drainage Area (MI2) Peak Discharge (CFS) Time of Peak Volume (IN) Prop Culvert 1 0.2469 374.4 30Jan2007, 13:06 6.84 Culvert 1 Routing 0.2469 371.8 30Jan2007, 13:12 6.82 Prop Culvert 2 0.0578 145.5 30Jan2007, 12:30 7.13 Culvert 2 Routing 0.0578 134.3 30Jan2007, 12:38 7.09 Proposed Pond Area 0.0300 103.2 30Jan2007, 12:20 9.03 Wet Pond 1 0.3347 471.1 303an2007, 13:08 7.04 Wet Pond 2 0.3347 470.9 303an2007, 13:08 7.04 Prop Bypass 1 0.0700 248.2 303anZ007, 12:18 8.78 Prop Pt A 0.4047 521.8 303an2007, 13:02 7.34 Ex Culvert 1 0.2469 374.4 301an2007, 13:06 6.84 Existing Bypass 1 0.0700 177.5 303an2007, 12:26 6.68 Ex Culvert 2 0.0578 145.5 303an2007, 12:30 7.13 Existing Pond Area 0.0300 85.5 30Jan2007, 12:22 6.81 Ex PtA 0.4047 621.3 301an2007, 12:36 6.85 100-Year Results Project: 2014 Detention 2 Simulation Run: 100 Year Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 100 Year Compute Time: 07Ju12014, 10:00:17 Control Spedfications: Control 1 Show Elements: All Elements Volume Units: (o) IN AC -Fr Sorting: Hydrologic Hydrologic dement Drainage Area (MI2) Peak Discharge (CFS) Time of Peak Volume (IN) Prop Culvert 1 0.2469 434.4 303an2007, 13:06 7.96 Culvert IRouting 0.2469 431.3 303an2007, 13:10 7.94 Prop Culvert 2 0.0578 167.9 301an2007, 12:30 8.27 Culvert 2Routing 0.0578 155.2 301anZ007, 12:38 8.23 Proposed Pond Area 0.0300 116.5 303an2007, 12:20 10.22 Wet Pond 1 0.3347 547.3 303an2007, 13:06 8.17 Wet Pond 2 0.3347 547.3 30Jan2007, 13:08 8.17 Prop Bypass 1 0.0700 2B0.8 303an2007, 12:18 9.97 Prop Pt 0.4047 606.0 303an2007, 13:00 8.48 Ex Culvert 1 0.2469 434.4 303an2007, 13:06 7.96 Existing Bypass 1 0.0700 206.4 303an2007, 12:26 7.80 Ex Culvert 2 0.0578 167.9 303an2007, 12:30 8.27 Existing Pond Area 0.0300 99.2 30Jan2007, 12:22 7.94 Ex Pt A 0.4047 721.9 30Jan2007, 12:34 7.97 Stormwater Management Technical Design Summary Report Bridgewood Subdivision Pond #1 Results 2-Year Results Project: 2014 Detention 2 Simulation Run: 2 Year Reservoir: Wet Pond StartofRun: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 2Year Compute Time: 07Jul2014, 10:20:09 Control Specifications: Control 1 Volume Units: rd) IN (-) AC+T Computed Results Peak Inflow : 142.5 (CFS) Date/fine of Peak Inflow: 30Jan2007, 13:18 Peak Outflow: 140.6 (CFS) Date/Time of Peak Outflow : 301an2007, 13:24 Total Inflow : 2.35 ON) Peak Storage : 2.7 (AC+T) Total Outflow : 2.34 (IN) Peak Fevation : 30B.7" 5-Year Results Project: 2014 Detention 2 Simulation Run: 5 Year Reservoir: Wet Pond 1 StartofRun: 30Jan2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 5 Year Compute Time: 073u12014, 10:20:00 Control Specifications: Control 1 Volume Units: i4! IN (1 AC -FT Computed Results Peak Inflow : 245.B (CFS) Date/Time of Peak Inflow: 303an2007, 13:04 Peak Outflow: 240.5 (CFS) Datefl-ime of Peak Outflow : 303an2007, 13:14 Total Inflow : 3.79 (IN) Peak Storage : 4.2 (AC+-0 Total Outflow : 3.78 ON) Peak Elevation : 309.5 (FT) 10-Year Results Project: 2014 Detention 2 Simulation Run: 10 Year Reservoir: Wet Pond 1 StartofRun: 303an2007,00:00 Basin Model: Bridgewood End of Run: 31Ian2007, 00:30 Meteorologic Model: 10 Year Compute Time: 07Ju12014, 10:00:02 Control Specifications: Control 1 Volume Units: * IN (-) AC -FT Computed Results Peak Inflow : 346.2 (CFS) Date/rme of Peak Inflow: 303an2007, 13:02 Peak Outflow: 337.0 (CFS) Date/Time of Peak Outflow : 303anZ007, 13:12 Total Inflow : 5.13 (IN) Peak Storage : 5.5 (AC -FT) Total Outflow: 5. 11(IN) Peak Elevation : 310.1(FT) Stormwater Management Technical Design Summary Report Bridgewood Subdivision k Pond #1 Results 25-Year Results Project: 2014 Detention 2 Simulation Run: 25 Year Reservoir: Wet Pond 1 Startof Run: 30Jan2007,00:00 Basin Model: Bridgewood End of Run: 31Jan2007, 00:30 Meteorologic Model: 25Year Compute Time: 07Jul2014, 10:00:06 Control Spedfications: Control 1 Volume Units: v IN) AC -FT Computed Results Peak Inflow : 417.7 (CFS) Date/Time of Peak Inflow: 30Jan2007, 12:58 Peak Outflow : 407.7 (CFS) Date/Time of Peak Outflow : 303an2007, 13:08 Total Inflow : 6.14 (IN) Peak Storage : 6.4 (AC+-0 Total Outflow: 6.12 (IN) Peak Elevation : 310.6 (FT) 50-Year Results Project: 2014 Detention 2 Simulation Run: 50 Year Reservoir: Wet Pond 1 Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 50 Year Compute Time: 07302014, 10:00: 10 Control Specifications: Control 1 Volume Units: i# IN (_t AC -FT Computed Results Peak Inflow : 481.6 (CFS) Datefl-ime of Peak Inflow : 303an2007, 12:58 Peak Outflow: 471, 1(CFS) Datetrime of Peak Outflow: 303an2007, 13:08 Total Inflow : 7.07 (IN) Peak Storage : 7.2 (AGFT) Total Outflow : 7.04 (IN) Peak Elevation : 310.9 (FT) 100-Year Results Project: 2014 Detention 2 Simulation Run: 100 Year Reservoir: Wet Pond 1 StartofRun: 303an2007,00:00 Basin Model: Bridgewood End of Run: 311an2007, 00:30 Meteorologic Model: 100 Year Compute Time: 073u12014, 10:00:17 Control Spedfications: Control 1 Volume Units: (o) IN (-) AC+T Computed Results Peak Inflow : 557.9 (CFS) Date/rime of Peak Inflow: 303an2007, 12:56 Peak Outflow : 547.3 (CFS) Datefflme of Peak Outflow : 303an2007, 13:06 Total Inflow : 8.20 (IN) Peak Storage : B.1(AC+-r) Total Outflow : 8.17 (IN) Peak Nevation : 311.4 (Fr) N Stormwater Management Technical Design Summary Report -- Bridgewood Subdivision Pond #2 Results 2-Year Results Project: 2014 Detention 2 Simulation Run: 2 Year Reservoir: Wet Pond 2 Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 2Year Compute Time: 073ul2014, 10:20:09 Control Specifications: Control 1 Volume Units: (®j IN (_) AC -FT Computed Results Peak Inflow : 140.6 (CFS) Date/fime of Peak Inflow: 303an2007, 13:24 Peak Outflow: 140.5 (CFS) Date/Tme of Peak Outflow : 303an2007, 13:26 Total Inflow : 2.34 (IN) Peak Storage : 0.2 (AC+T) Total Outflow : 2.34 (IN) Peak Elevation : 306.5 (FT) 5-Year Results Project: 2014 Detention 2 Simulation Run: 5 Year Reservoir: Wet Pond 2 Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 5 Year Compute Time: 073u12014, 10:20:00 Control Specifications: Control 1 Volume Units: !§)IN i_ AC -FT Computed Results Peak Inflow : 240.5 (CFS) Date/rime of Peak Inflow: 303an2007, 13:14 Peak Outflow : 240.5 (CFS) Date/rime of Peak Outflow : 303an2007, 13:16 Total Inflow : 3.78 ON) Peak Storage : 0.3 (AC-FO Total Outflow : 3.78 (IN) Peak Elevation : 307.2 (FT) 10-Year Results Project: 2014Detention 2 Simulation Run: 10 Year Reservoir: Wet Pond 2 Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 10 Year Compute Time: 073u12014, 10:00:02 Control Spedfications: Control 1 Volume Units: gym) IN ¢ j AC -FT Computed Results Peak Inflow : 337.0 (CFS) Date/flme of Peak Inflow : 303an2007, 13:12 Peak Outflow: 337.0 (CFS) Date/Time of Peak Outflow : 303an2007, 13:12 Total Inflow : 5. 11(IN) Peak Storage : 0.5 (AC+T) Total Outflow : 5. 11(IN) Peak Elevation : 307.7 (Fr) Storinwater Management Technical Design Summary Report Bridgewood Subdivision Pond #2 Results 25-Year Results Project: 2014Detention 2 Simulation Run: 25 Year Reservoir: Wet Pond 2 Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 25 Year Compute Time: 073u12014, 10:00:06 Control Specifications: Control 1 Volume Units: (, IN (_,i AC -FT Computed Results Peak Inflow : 407.7 (CFS) Date/Time of Peak Inflow : 303an2007, 13:08 Peak Outflow : 407.7 (CFS) Date/Tme of Peak Outflow : 303an2007, 13: 10 Total Inflow : 6.12 ON) Peak Storage : 0.6 (AC+- ) Total Outflow : 6.12 ON) Peak Elevation ; 308.1(FT) 50-Year Results Project: 2014 Detention 2 Simulation Run: 50 Year Reservoir: Wet Pond 2 Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 50 Year Compute Time: 073u12014, 10:00: 10 Control Specifications: Control 1 Volume Units: ,4� IN �-� AC -Fr Computed Results Peak Inflow : 471.1(CFS) Datejrme of Peak Inflow : 303an2007, 13:08 Peak Outflow: 470.9 (CFS) Date/Tme of Peak Outflow : 303an2007, 13:08 Total Inflow : 7.04 (IN) Peak Storage : 0.6 (AC4=f) Total Outflow : 7.04 ON) Peak Elevation : 308.4 (FT) 100-Year Results Project: 2014 Detention 2 Simulation Run: 100 Year Reservoir: Wet Pond 2 Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 100 Year Compute Time: 07Jul2014, 10:00:17 Control Specifications: Control 1 Volume Units: i6, IN°) AC -FT Computed Results Peak Inflow : 547.3 (CFS) Datelrime of Peak Inflow: 303an2007, 13:06 Peak Outflow : 547.3 (CFS) Date/rime of Peak Outflow : 303an2007, 13:08 Total Inflow : 8.17 (IN) Peak Storage : 0.7 (AC+-0 Total Outflow: B.17 (IN) Peak Elevation : 308.7 (Fn Stormwater Management Technical Design Summary Report Bridgewood Subdivision Culvert #1 Results 2-Year Results Project: 2014 Detention 2 Simulation Run: 2 Year Reservoir: Culvert 1 Routing Startof Run: 30Jan2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 2Year Compute Time: 07Jul2014, 10:20:09 Control Specifications: Control 1 Volume Units: O IN j AC -FT Computed Results Peak Inflow : 118.0 (CFS) Date/Time of Peak Inflow: 303an2007, 13: 10 Peak Outflow : 112.6 (CFS) Date/Time of Peak Outflow : 303an2007, 13:22 Total Inflow : 2.17 (IN) Peak Storage : 1.8 (AC+-0 Total Outflow : 2.17 (IN) Peak Elevation : 313.0 (FT) 5-Year Results Project: 2014 Detention 2 Simulation Run: 5 Year Reservoir: Culvert I Routing Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 5 Year Compute Time: 07Jul2014, 10:20:00 Control Specifications: Control 1 Volume Units: ia, IN ( j AC -FT Computed Results Peak Inflow : 197.3 (CFS) Date/Time of Peak Inflow : 303an2007, 13:08 Peak Outflow: 192.7 (CFS) Date/Tme of Peak Outflow : 303an2007, 13:16 Total Inflow : 3.59 (IN) Peak Storage : 2.7 (AC+T) Total Outflow : 3.58 ON) Peak Elevation : 313.4 (FT) 10-Year Results Project: 2014 Detention 2 Simulation Run: 10 Year Reservoir: Culvert 1 Routing Start of Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 31Jan2007, 00:30 Meteorologic Model: 10 Year Compute Time: 07Jul2014, 10:00:02 Control Specifications: Control 1 Volume Units: (p,, IN :i AC -FT Computed Results Peak Inflow : 270.3 (CFS) Date/Time of Peak Inflow: 303an2007, 13:08 Peak Outflow : 268.3 (CFS) Datefrime of Peak Outflow: 303an2007, 13:12 Total Inflow : 4.92 (IN) Peak Storage : 3.3 (AC+T) Total Outflow : 4.91(IN) Peak Elevation : 313.6 (FT) Culvert #1 Results Stormwater Management Technical Design Summary Report Bridgewood Subdivision 25-Year Results Project: 2014 Detention 2 Simulation Run: 25 Year Reservoir: Culvert 1 Routing Startof Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 31Jan2007, 00:30 Meteorologic Model: 25 Year Compute Time: 07Ju12014, 10:00:06 Control Specifications: Control 1 Volume Units: .;a. IN (_)AC-FI Computed Results Peak Inflow : 324.6 (CFS) Date/Time of Peak Inflow : 303an2007, 13:06 Peak Outflow : 322.4 (CFS) Date/rime of Peak Outflow : 303an2007, 13:12 Total Inflow : 5.91(IN) Peak Storage : 3.7 (AC -FT) Total Outflow: 5.90 (IN) Peak Elevation : 313.7 (Fr) 50-Year Results Project: 2014 Detention 2 Simulation Run: 50 Year Reservoir: Culvert 1 Routing Startof Run: 303an2007,00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 50 Year Compute Time: 073u12014, 10:00: 10 Control Specifications: Control 1 Volume Units: io,IN ¢ AC -FT Computed Results Peak Inflow : 374.4 (CFS) Date/Time of Peak Inflow : 30Jan2007, 13:06 Peak Outflow : 371.8 (CFS) Date/rme of Peak Outflow : 30Jan2007, 13:12 Total Inflow : 6.84 ON) Peak Storage : 4.0 (AGFT) Total Outflow : 6.82 (IN) Peak Elevation : 313.8 (FT) 100-Year Results Project: 2014 Detention 2 Simulation Run: 100 Year Reservoir: Culvert 1 Routing Startof Run: 303an2007, 00:00 Basin Model: Bridgewood End of Run: 313an2007, 00:30 Meteorologic Model: 100 Year Compute Time: 07Jul2014, 10:00:17 Control Specifications: Control 1 Volume Units: gym; IN AC -FT Computed Results Peak Inflow : 434.4 (CFS) Datelame of Peak Inflow : 303an2007, 13:06 Peak Outflow : 431.3 (CFS) Date/Time of Peak Outflow : 303an2007, 13: 10 Total Inflow : 7.96 (IN) Peak Storage : 4.3 (AGFr) Total Outflow: 7.94 (IN) Peak Elevation : 313.9 (FT) Stormwater Management Technical Design Summary Report Bridgewood Subdivision 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 Engineering Firm Name and Address: Jurisdiction McClure & Browne Engineering/Surveying, Inc. City: Bryan 1008 Woodcreek Drive, Suite 103 x College Station College Station, Texas 77845 Date of Submittal: (979)693-3838 Lead Engineer's Name and Contact Info.(phone, e-mail, fax): Other: Jeffery L. Robertson, P.E. Supporting Engineering / Consulting Firm(s): Other contacts: Developer / Owner 1 Applicant Information Developer / Applicant Name and Address: Phone and e-mail: BCS Development Company (979)690-1222 4090 State Hwy. 6 South College Station, TX 77845 Property Owner(s) if not Developer / Applicant (& address): Phone and e-mail: BCS Development Company Project Identification Development Name: Bridgewood Subdivision Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision? Multi -phase Subdivision If multi -phase, subject property is phase I of 4 Legal description of subject property (phase) or Project Area: (see Section ll, Paragraph B-3a) Siena Subdivision 60.9 Acres out of Robert Stevenson Survey, A-54 College Station, Brazos County, Texas If subject property (phase) is second or later phase of a project, describe general status of all earlier phases. For most recent earlier phase Include submittal and review dates. Project is a master planned development with multiple phases. There will be a CSISD School built on the property along with 12o residential lots. General Location of Project Area, or subject property (phase): Project site is located along William D. Fitch Pkwy (State Hwy 40) and W.S. Phillips Pkwy south of the intersection of William D. Fitch Pkwy. and Barron Road. In City Limits? Extraterritorial Jurisdiction (acreage): Bryan: acres. Bryan: College Station: College Station: 60.9 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: developments: State Hwy 40 W.S. Phillips Pkwy Agnes aker Living Trust (Un-Developed) Robert Carroll (Un-Developed) Castlegate Subdivision (developed) Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): Spring Creek Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: 13-9ooz64 Final Plat File #: Date: Name: Bridgewood Subdivision Status and Vol/Pg: Pending Approval If two plats, second name: File #: Status: Date: Zoning Information For Project or Subject Property (or Phase) PDD ExistingProposed? Existing Case Code: 13-900238 or Zoning Type: p 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? Submittal Date Review Date Review Comments Addressed? Yes _ No _ In Writing? When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any. 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. Contact: Date: Subject: Coordination —Dept. 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 x Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes No x Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? Yes No X Coordination with Summarize need(s) & actions taken (include contacts & dates): TAMUS Needed? Yes No x Permits For Project or Subject Property (or Phase) As to stormwater management, are permits required for the proposed work from any of the entities listed below? If so, summarize status of efforts toward that objective ins aces below. Entity Permitted or Approved . Status of Actions (include dates) US Army Crops of Engineers No x Yes _ US Environmental Protection Agency No x Yes _ Texas Commission on A Stormwater Pollution Prevention Plan must be Environmental Quality implemented prior to the start of construction No Yes x according to TPDES General Permit No. TXR150000. Brazos River Authority Nox 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? Existing undeveloped land (wooded pasture with trees and underbrush). Existing impervious cover is limited to existing gravel roads. 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 applicable) — Building on a single lot, or adjoining lots, where proposed plat will not form a new street (but may include ROW dedication to existing streets). Other (explain): Subdivision x Construction of streets and utilities to serve one or more platted lots. Development Construction of streets and utilities to serve one or more proposed lots on Project lands represented by pending plats. Site proiects: building use(s), approximate floor space, impervious cover ratio. Describe Subdivisions: number of lots by general type of use, linear feet of streets and Nature and drainage easements or ROW, Size Of This subdivision includes 120 lots (50'x130'). The development Proposed consists of approximately 8,350 LF of streets. Project Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? x No Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse No x Yes (Section II, Paragraph 131) or a tributary thereof? Is any part of subject property in floodplain No x Yes Rate Map 48041CO325E area of a FEMA-regulated watercourse? — Encroachment(s) into Floodplain Encroachment purpose(s): — Building site(s) Road crossing(s) areas planned? Utility crossing(s) Other (explain): No x Yes If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA- approved Flood Study to define allowable encroachments in proposed areas? Explain. 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 copy if not already in City files. 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 x plan for the property in Part 4. If property is part of multi -phase project, provide overview of stormwater management plan for Project Area here, In Part 4 describe how plan for subject property will comply therewith. Do existing topographic features on subject property store or detain runoff? x No Yes Describe them (include approximate size, volume, outfall, model, etc). Any known drainage or flooding problems in areas near subject property? x No _ Yes Identify: Based on location of study property in a watershed, is Type 1 Detention (flood control) needed? (see Table B-1 in Appendix B) x Detention is required. _ Need must be evaluated. Detention not required. What decision has been reached? By whom? Dranainage Design Guidelines require Detention. 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) Does subject property straddle a Watershed or Basin divide? X No Yes If yes, describesplits below. In Part 4 describe design concept for handling this. Watershed or Basin Larger acreage Lesser acreage Above -Project Areas(Section Il, Paragraph B3-a) Does Project Area (project or phase) receive runoff from upland areas? _ No X Yes Size(s) of area(s) in acres: 1) 159 ac 2) 37 ac 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), 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). 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. exist for any part of pathway(s)? x No Yes Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired?) Pathway Areas Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). Nearby Drainage Facilities Do any of these have hydrologic or hydraulic influence on proposed stormwater design? No —Yes If yes, explain: STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMAR` -- 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 area, flow section, or discharge point. Culverts have been designed on W.S. Phillips Pkwy to allow the water pass under the roadway and continue on in the existing tributaries and creek. Discharge(s) To Lower Property(ies) (Section II, Paragraph E1) Does project include drainage features (existing or future) proposed to become public via platting? x No Yes Separate Instrument? x No Yes Per Guidelines reference above, how will Establishing Easements (Scenario 1) runoff be discharged to neighboring Pre -development Release (Scenario 2) 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? x No Yes How will runoff from Project 1. With facility(ies) involving other development projects. Area be mitigated to pre- 2 Establishing features to serve overall Project Area, development conditions? Select any or all of 1, 2, 3. x On phase (or site) project basis within Project Area. and/or 3, and explain below. 1. Shared facility (type & location of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit #� 2. For Overall Project Area (type & location of facilities): (Attached Exhibit #) 3. By phase (or site) proiect: 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)? a r Are other Best Management Practices for reducing stormwater pollutants proposed? a- No Yes Summarize type of BMP and extent of use: a c rn N (D 0 Z If design of any runoff -handling facilities deviate from provisions of B-CS Technical o x Specifications, check type facility(ies) and explain in later questions. Cf) N 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 Proiect Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? No x Yes Identify type and general size and In which phase(s). WS Phillips Pkwy Culvert #1 - 3 Bbl. 5'x3' Box Culvert WS Phillips Pkwy Culvert #2 - 51x3' Box Culvert If detention/retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): Detention Ponds will be built with the first phase and will serve the entire development including the CSISD School Site. Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier analysis and report for larger area? Yes No, then summarize the difference(s): Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? a Steepest side slopes: Usual front slopes: Usual back slopes: w } Flow line slopes: least Typical distance from travelway: a (Attached Exhibit #) typical greatest o y Z a ° x 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? w fl ° x No Yes If yes explain: U -O t w X NAre valley gutters proposed to cross any street away from an intersection? o x No Yes Explain: (number of locations?) �Z _ m Q 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 0. 60% Usual varies Greatest 3.84% Are inlets recessed 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. m Will inlet size and placement prevent exceeding allowable water spread for 10-year design storm throughout site (or phase)? x Yes No If no, explain. m Sag curves: Are inlets placed at low points? x Yes No Are inlets and g conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? 0 x Yes No Explain "no" answers. u, m 2 Will 100-yr stormflow be contained in combination of ROW and buried conduit on Q whole length of all streets? x Yes _ No If no, describe where and why. Do designs for curb, gutter, and inlets comply with B-CS Technical Specifications? x Yes No If not, describe difference(s) and attach justification. Are any 12-inch laterals used? X No Yes Identify length(s) and where used. NN Pipe runs between system Typical is° Longest 365 r access points (feet): Nx Are junction boxes used at each bend? X Yes No If not, explain where and why. N G @ O Z E y Are downstream soffits at or below upstream soffits? Least amount that hydraulic N Yes x 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). U m 1) Watercourse (or system), velocity, and angle? 0 Connection to 31S Phillips Culverts, 90 degrees in side of box C Velocity 9.3 fps O E 2) Watercourse (or system), velocity, and angle? O C x Headwall connection to Spring Creek from Phase 2 'C Angle = 90 degrees O Velocity = 6.8 fps 0)) E v 3) Watercourse (or system), velocity, and angle? Ty Headwall connection to Spring Creek from Phase 2 CQ) O Angle = 90 degrees Velocity = 9.2 fps i O O. E - For each outfall above, what measures are taken to prevent erosion or scour of and all facilities at juncture? Nreceiving 1) Rock Rip Rap at discharge into tributary. (6 CU Q. 2) N v, 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): N N N c } Flow line slopes (minimum and maximum): a 0 z Outfall characteristics for each (velocity, convergent angle, & end treatment). N N X (6 3 N N Will 100-year design storm runoff be contained within easement(s) or platted drainage ROW in all instances? Yes No If "no" explain: STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.6) 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 Y Are top of banks separated from road shoulders 2 feet or more? Yes No m _ _ Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No — N For any "no" answers provide location(s) and explain: a 0 0 D' If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: U) r Is 100-year design flow contained in conduit/swale combination? —Yes —No w If "no" explain: U 0 ccaca Space for 100-year storm flow? ROW _ Easement _ Width Z Swale Surface type, minimum Conduit Type and size, minimum and maximum x m and maximum slopes: slopes, design storm: c 0 Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c � c c m — as U p Q o 0 Access Describe how maintenance access is provided (to swale, into conduit): o o E E o a 0 = c c Instance 2 Describe general location, approximate length: o E 0 � a Is 100-year design flow contained in conduit/swale combination? —Yes —No ° o If "no" explain: m `o_ c L Space for 100-year storm flow? ROW Easement Width o 0 0 Swale Surface type, minimum Conduit Type and size, minimum and maximum a> and maximum slopes: slopes, design storm: a 0 0 Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): 0 m c 3 ° — N Access Describe how maintenance access is provided (to swale, into conduit): STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. 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Yes _ No Is swale wholly } within drainage ROW? Yes _ No Explain "no" answers: m 0 Access Describe how maintenance access is provide: a) o z c g 0 o Instance 2 Describe general location, approximate length, surfacing: 0 c N o E c N Is 0 contained n swale?swale wholly `o drainage ge ROW? YesNo E plain "no" answers: withind — �0 N of Access Describe how maintenance access is provided: U 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 o a describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year o w design flow, and amount of freeboard: fl N N Instance 1: c } N E a) 0 Instance 2: 0 E o Z x Instance 3: m U STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMAR` - 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 Yes If "yes" provide the information below. Will small creeks and their floodplains remain undisturbed? —Yes —No How many disturbance instances? Identify each planned location: For each location, describe length and general type of proposed improvement (including floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year design flow. a c c Watercourses (and tributaries): Aside from fringe changes, are Regulatory $ Watercourses proposed to be altered? No Yes Explain below. Submit full report describing proposed changes to Regulatory Watercourses. Address E existing and proposed section size and shape, surfaces, alignment, flow line changes, length affected, and capacity, and provide full documentation of analysis procedures 2 and data. Is full report submitted? Yes _ No If "no" explain: rz E c c vAll 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? _ 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: 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? 2 For each provide info. below. For each dry -type facilitiy: Facility 1 Facility 2 Acres served & design volume + 10% 214 ac 0. Sac-ft 214 ac 1 .3ac-ft 100-yr volume: free flow & plugged 6.3acft 8.3acft cft 0.7acft Design discharge (10 yr & 25 yr) 352 cfs 422 cfs F352cfs 422 cfs Spillway crest at 100-yr WSE? X yes _ no X yes _ no Berms 6 inches above plugged WSE? X yes _ no X yes _ no Explain any "no" answers: N N } X For each facility what is 25-yr design Q, and design of outlet structure? Facility 1: 422 cfs Structure is a trapezoidal spillway channel Z Facility 2: 422 cfs structure is a trapezoidal spillway channel Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: —Yes X No Facility 2: —Yes X No If "no" explain: N Pond Discharges into Common Area and is conveyed to 0 o an existing drainage easement. IL For each, what is velocity of 25-yr design discharge at outlet? & at spillway? T Facility 1: 3.3 fps & 3 . 3 fps Facility 2: 4.1 fps & 4.1 fps Are energy dissipation measures used? No X Yes Describe type and LL location: E 0 Concrete lined channel with river rock grouted in place for both pond discharge channels. m For each, is spillway surface treatment other than concrete? Yes or no, and describe: Q Facility 1: No Facility 2: No For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Concrete is carried to end of spillway and rock rip -rap Facility2:is used at the receiving point from discharge of Pond 2. If berms are used give heights, slopes and surface treatments of sides. Facility 1: 5' , 4:1, Grass Facility 2: 51, 4:1, Grass 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 I 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; Yes m LL °�� Facility 2: Yes c - o c iu m For additional facilities provide all same information on a separate sheet. 0 Are parking areas to be used for detention? x 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: m c oAre culverts parallel to public roadway alignment? Yes _ No Explain: 2 (6 Q Creeks at Private Drives: Do private driveways, drives, or streets cross drainage m ways that serve Above -Project areas or are in public easements/ ROW? z No Yes If "yes" provide information below. w x How many instances? Describe location and provide information below. N 1 a) Location 1: 0 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 Watercourses I& Tributaries): Are culverts proposed on these facilities? x No Yes, then provide full report documenting assumptions, criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? Yes _ No If "no", explain: Arterial or Major Collector Streets: Will culverts serve these types of roadways? N_ No Yes How many instances? For each identify the location and provide the information below. Instance 1: ws Phillips Culvert #1 Sta. 55+50 } CL wo Instance 2: ws Phillips Culvert #2 Sta. 46+30 X c o Instance 3: c 0 o '2 Yes or No for the 100-year design flow: 1 2 3 z E `o c Headwater WSE 1 foot below lowest curb top? Yes Yes Spread of headwater within ROW or easement? Yes Yes E v° Is velocity limited per conditions (Table C-11)? Yes Yes "no" N m Explain any answer(s): N 0 0 U — T f0 0 3 a o o :Q Minor Collector or Local Streets: Will culverts serve these types of streets? No x Yes How many instances? 1 for each identify the Is location and provide the information below: 00 � Y Instance 1: Culvert at Brewster Drive and William D. Fitch Pkwy. c Instance 2: m m o Instance 3: > For each instance enter value, or "yes" / "no" for: 1 2 3 aU ° Design yr. headwater WSE 1 ft. below curb top? Yes Q 100-yr. max. depth at street crown 2 feet or less? Yes E Product of velocity (fps) & depth at crown (ft) = ? 0.0 Is velocity limited per conditions (Table C-11)? Yes Limit of down stream analysis (feet)? 100, 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 eight boxes. Do culverts and travelways intersect at 90 degrees? x 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? x No _ Yes If "yes" identify location(s), describe change(s), and justification: Are flumes or conduit to discharge into culvert barrel(s)? _ No x Yes If yes, identify location(s) and provide justification: WS Phillips Culvert #1 - Storm Drain pipe in side of box to limit erosi Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? x No _ Yes If "yes" identify location(s), describe outfall design treatment(s): W c c 0 U t: > Is scour/erosion protection provided to ensure long term stability of culvert structural <j components, and surfacing at culvert ends? x 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? x Yes _ No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstream to neighboring land(s) not encompassed in subject property? x No Yes If 'yes' describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B-CS Tech. Specifications? x 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? _ 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 N m m A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? —Yes —No If "no" explain: Is a Stormwater Provide a general description of planned techniques: w Pollution Prevention Silt fence and inlet filtration will serve as the = Plan(SW3P) main protection against stormwater pollution. The C1 m established for project construction? Contractor shall use any other means necessary m throughout construction. No x Yes Special Designs — Non -Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream replication, BMPs for water quality, etc.) proposed for any aspect of subject property project? x No _ Yes If "yes" list general type and location below. Provide full report about the proposed special design(s) including rationale for use and expected benefits. Report must substantiate that stormwater management objectives will not be compromised, and that maintenance cost will not exceed those of traditional design solution(s). Is report provided? Yes _ No If "no" explain: 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? x Yes No Briefly summarize the range of applications made of the Rational Formula: For the Rational Formula we assumed that a residential area has a runoff coefficient of 0.55. What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 4.92 acres Location (or identifier): DA 23 STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMAR` 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 determinations for time of concentration, was segment analysis used? x No —Yes In approximately what percent of Design Drainage Areas? % As to intensity -duration -frequency and rain depth criteria for determining runoff flows, were any criteria other than those provided in these Guidelines used? x No _Yes If "yes" identify type of data, source(s), and where applied: For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked), and that used as the basis for design. Feature Analysis Year(s) Design Year Storm drain system for arterial and collector streets 10, 25, 100 10 Storm drain system for local streets 10, 25, 100 10 Open channels Swale/buried conduit combination in lieu of channel Swales Roadside ditches and culverts serving them Detention facilities: spillway crest and its outfall 2, s, 10, 25, so, 100 2, s, 10, 25, s Detention facilities: outlet and conveyance structure(s) 2, s, 10, 25, 50, loo 2, s, 10, 25, s Detention facilities: volume when outlet plugged 100 100 Culverts serving private drives or streets Culverts serving public roadways i2, s, 10, 2s, s0,100 2, s, 10, 2s, 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) Lowest (feet per second) Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For street gutters: 0.014 For conduit type(s) RCP 0.014 HDPE 0.014 Coefficients: STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY --- Effective February 2007 As Revised February 2009 ,100 ,100 0. 100 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? X No —Yes Head and friction losses X No —Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? X Yes _ No Are elevation drops provided at inlets, manholes, and junction boxes? x Yes _ No Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? —Yes X No For 100-year flow conditions? X Yes _ No Explain any "no" answers: Hydraulic grade lines are calculated but not shown. What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: Both storm sewer designs assumed the pipes were full for tailwater conditions. 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 design discharge, will operation be outlet (barrel) control or inlet control? 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 14icrosoft Excel Spreadsheet for inlet, pipe, and culvert sizing AEC -HMS software for Pond )Design 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: The aridgewood subdivision, will have no adverse impact to downstream properties and conforms to the overall subdivision report. Attestation the accuracy and foregoing 6 Parts of "This report (plan) for the drainage design of the development named in Part B was prepare 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 imp rovements have p en issued or fall under applicable general permits."®"boa (Affix Seal) �Q4 C?l; 7',, 9 fess at Engineer ® IEFFERY L, (;C_:f:f{7 Cd, ............. .,,.o,... . State of Texas PE No. o7 f,, -- j ��+°•• <r�- -� STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: As TECH. 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W Ml�i b Wlp� b N MiM [Vi0I0 \O rajnl� -.i •z � N N N IN NI ^� OHO N OI^ I i IN N ___ __ - _ —I t L ._i . � aaa glp.Ml )s I m m m m w m w m r r r r N N N N r m N m M w M r r r r m N N NPIIm m M r N r w ol�lr N M MjM N r N r. r•r PI;N N V Ialulln a lu1oS, i ,° N v o vie�co m o�N m owila al�ioo �o � v�m of{vllo r Nl�w O �J� .IaA IiA.IC OOOMOOIO.O o o M ,ri0.0 O.00OOIOO 0 01010, O6 of ojlo O 0 O 0 OIO : oIo oo0 . . .0 Oj010 oloio TVV V I O m r vl ail m O1� M'N `DI <O r m eaAe aBnulnaQ N M ti Y V'I,° W M O N W O , Vl V VW •D n m V M V1 0 1 r N V� V CaaF+atialllnaQ w ro o d ro F — o o o'.o N N ... ro�m I� ro o — — oIo 41 4Io Pi ^', Ni �N o N Q Z I ,ei m m NINI. m _ _ ml, ro�m MO.IaAO •D .D NI —i- Oni V'12IV I v M N O N M N O I O M O Ol O M O N I N N OI�IM NIN N N I M d9 V NI V HG 0 D p N N N i N i N M I EXHIBIT C-3 PIPE SIZE CALCULATIONS Bridgewood Subdivision I � =° I I I I I v ❑ .k I bU ( -X N N I 1 ln u W F a O F O y u u d o l .a o. o o u Zi N Z Z W W sL0. Cai u A p 1 9 Ac min IYr Icfs jets N !cfs i'% % fps min min 6.03 6.02 10'Oi 10 12.3 16.4 1'I 16.4 0,601 2.27 24 5.2 315 1.01 11.01 6.02 out _1.4 2.8 11.5 10 23.2 23.2I 1 1 23.2 0.37 1.19 30 4.7 i 364 1.291 12.79 T 6.01 b out 1 31 111.3 10 10.5 14 0. 1 14.0 0.441 0.50 24 4 5 74 0 28 11 62- 10 11 O5� 100j 10I 601 60i038�. 18 34 30 0_15 1015 i_ _ 11 1.01 _ 12 13 __� 1.3 0.9 _45 10.1 � 10T 11 0 10.01 10 8.1 14,61 1 14 6 i 0 48 _ 10.71_1 10.7 1.20 24JI}- f 18I 4.61 _346I _ 6 11 30� _ 1.241 0_088� 11.391 10.08J t- _ 13 1.02 1.31 10 1 10 11.3 15 0i 1 15.0I0.51 24 4 8'- 401 0 14 10.221 1.01 1.02 1.02 1 03bb 1�i�10 2.9 104 12.6 10 22Ty _ 13911 1391 043� 0.34 1 22.61_ 0 35L 1.72 24 30 445141 4.611 210 1.19 0.776 12.SSt� 13.34 IMb 104b� 44 133 10 1 336 3361 336- 0771 0.93 30 681 42i 010 1344 1.04b 20 _1 _ 17 1 18 4 81 061 13.41 10 _ __36 41 100. 10t_ 53' 36 4. 1 36 4 i 0 911 1.00 _ _ 71; 1 711_ 0521 30� 18 7.41 32� - 30I 0 07 ___ 012 j _ 10.121 18 19 11 101. 10!__95r 1261 126i 167 _ 18; -_40 71. 351 0.08 _ 10211 _ 19 ) 20 I, 16 102 10 ; 140 186_ 78 18.6r1 0 24j 591_35 010 20 3ib 7.0 13 51 10 53.11 _ 53.1 1 0.73i 361 7.5i 240 0.53 14.05 2.01 j 2.02 1.0' 10.00' 10 83'11.0' _53.1 1T 11.0 1.26; 1.00 181 6.2i 221 0.59 10.59 2.02 1 2.03 1.71 10.6I 1--- 1 16 9 0 :0.8456 _._ 11.15 23 - 24 2 3 - __ -- -- 18 5 10 14 71 __ -- _ 19 51 1 19 5, 0 86 24' 6 2 325 0 87 19 37 -- _ 24 1 25 28 194110 I-___174 ---� y_ 1 23211 2321 563 181. 30 _ 004 19411 _ 25 1 2.03- 32 20.211 20.2I_ 0.28 30� 41 40j_-_016 19.57T 2.04 2.03 1 0! -9--10 -------------------- 10.11 10 1 8 8 11 7'_t 11.7 j 0.31 0.511 24 3 7 0.26 10.411 2.05 - 2.04 0.7 10.0110 1 57 76 1 7.6i 0.60 0.47 18 _58 431 38i 015 10.151 2.03 29B 2 5.9' 196j 10 1 371 1 371 1 3711 036' 00.48r 36 5353� 66 301_ 021 1978 10_08 28B B_+ 1.4 1001 10 1231 164;_1 164 8 _ 181___93 _005 29B 1 31B 7.8 198 10 ` 485' 1 485i_ 061 36i___69i. 329 0.80L 20581 30B ! 31B ._31 �I 0.9 - _ _ _485 101 10 76' .____. _ - 101 1' _ 1011 107 - - 18f 57 _ 50 0I _- _ 15 - 1- 0.21�_ B!---out I out 16,5 20 .6, 10 101.1)I 101.0 1 101.0 0.57! 481 8.0[100 0.21 20.79 7/1/2014 'Includes 33% Flow Increase for pipe sizes <27" dia 10530014-dra - Revlsed2.x15 ` " See Plan & Profile for pipe slope used (Pipe slope>or= Friction slope) Exhibit C-3 E L 0 L r 0 CD .— in W U Z J N m 0 0 X � 0 U � J 'L LL CV �dN OOom NNNNo(mJNNONO 000 �LL1t%ppi ^Nenmrym�m�om nm mrymo�P nam �n a,m mrr aOlm�.N--tryry t�i uQ N�� mNmP�NImVm�alml1 GYM �WNPm N.�pNN �iONn� m��p�mN�O$m �A�i 0 dom(VNNNMVi)Y�� Nr<�-.- �y YYYYYYYYYYYYY YYYYYYYYYYY YYY O V 0000000000000 00000000000 000 F'c gi 38nSe�oon mm. 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