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SDP200800027 Calculations 2008-03-02
HYDROLOGIC /HYDRAULIC CALCULATIONS FOR TIP -TOP RESTAURANT March 02, 2008 LOCATION: Tax Map 78, Parcel 10A Rivanna District, Albemarle County, Virginia OWNER / DEVELOPER: Vassalos, LLC 1186 TURNER MOUNTAIN ROAD Charlottesville, VA 22903 Summary: PREPARED BY: Dominion Development Resources 172 South Pantops Road Charlottesville, VA 22911 434.979.8121 F) 434.979.1681 INDEX Pre - Development: DA -A Flood Hydrographs: Post - Development: 2 3 -4 DA -M Hydrographs:5 -7 DA -N Hydrographs:8 -10 Combined Hydrographs:11 -13 Pond & Outlet Structure:14 -19 Routed Hydrographs:20 -22 Drainage Area Maps are at the end of this packet Dominion Development Resources, LLC Page 1 434) 979 -8121 Tip Top, SWM -1 Summary One pond will provide stormwater management for Tip Top Restaurant. SWM Pond 1 is a detention basin which provides quantity and quality control. Drainage areas DA -N and DA -M flow into SWM Pond 1. DA -N and DA -M are combined prior to routing through the detention basin. The routed, combined flows from DA- N and DA -M do not exceed the pre - development peak runoff rate of DA -A. Run -off Summary Stormwater Pre -Dev Pre -Dev Pre -Dev Post -Post -Dev Post -Dev Management DA 2 -Year 10 -Year Dev 2 -Year 10 -Year Facility Peak Peak DA Peak Peak SWM -1 A 0.70 0.98 M & N 0.56 0.97 cfs cfs cfs cfs Dominion Development Resources, LLC Page 2 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: DA -A 2 -year Type: Modified Rational HYDROGRAPH INFORMATION] Peak Flow (Qp)0.70 cfs) Time to Peak (Tp)15.00 min) Time of Base (TO)37.50 min) Volume 0.02 ac -ft) Time Step 1.00 min) Flow Multiplier 1.00 RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier 1.00 Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.02 cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -A Pre Parking 0.10 0 0.90 DA -A Pre Grass 0.60 0 0.20 Overall Approximation 0.69 NA 0.30 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc)15.00 min) RAINFALL DESCRIPTION] Distribution Type Synthetic Total Precipitation 0.85 in) Return Period 2 (yr) Storm Duration 0.25 hr) Dominion Development Resources, LLC Page 3 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] DA -A 10 -year Modified Rational Peak Flow (Qp)0.98 cfs) Time to Peak (Tp)15.00 min) Time of Base (Tb)37.50 min) Volume 0.03 ac -ft; Time Step 1.00 min) Flow Multiplier 1.00 RATIONAL HYDROGRAPH INFORMATION] Time of Concentration (Tc) Flow Multiplier 1.00 15.00 (min) Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.03 cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -A Pre Parking 0.10 0 0.90 DA -A Pre Grass 0.60 0 0.20 Overall Approximation 0.69 NA 0.30 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc)15.00 (min) RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.18 (in) Return Period = User Defined (yr) Storm Duration = 0.25 (hr) Dominion Development Resources, LLC Page 4 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: DA -M 2 -year Type: Modified Rational HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.25 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 15.57 (min) Volume = 0.02 (ac -ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.02 (cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -M Post Parking 0.29 0 0.90 DA -M Post Grass 0.07 0 0.20 Overall Approximation 0.36 NA 0.77 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.60 (in) Return Period = 2 (yr) Storm Duration = 0.13 (hr)Hydrograph Dominion Development Resources, LLC Page 5 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: DA -M 10 -year Type: Modified Rational HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.68 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 15.57 (min) Volume = 0.02 (ac -ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.02 (cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -M Post Parking 0.29 0 0.90 DA -M Post Grass 0.07 0 0.20 Overall Approximation 0.36 NA 0.77 TIME CONCENTRATION -- User Defined] Time of Concentration (To) = 5.00 (min) RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.81 (in) Return Period = User Defined (yr) Storm Duration = 0.13 (hr) Dominion Development Resources, LLC Page 6 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: DA -M 100 Year Type: Modified Rational HYDROGRAPH INFORMATION] Peak Flow (Qp)2.37 cfs) Time to Peak (Tp)5.00 min) Time of Base (Tb)15.57 min) Volume 0.03 ac -ft) Time Step 1.00 min) Flow Multiplier 1.00 RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier 1.00 Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.03 cu ft BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -M Post Parking 0.29 0 0.90 DA -M Post Grass 0.07 0 0.20 Overall Approximation 0.36 NA 0.77 TIME CONCENTRATION -- User Defined] Time of Concentration (To)5.00 min) RAINFALL DESCRIPTION] Distribution Type Synthetic Total Precipitation 1.14 in) Return Period 100 yr) Storm Duration 0.13 hr) Dominion Development Resources, LLC Page 7 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] DA -N 2 Year Modified Rational Peak Flow (Qp)0.71 cfs) Time to Peak (Tp)8.07 min) Time of Base (Tb)20.18 min) Volume 0.01 ac -ft) Time Step 1.00 min) Flow Multiplier 1.00 0.34 RATIONAL HYDROGRAPH INFORMATION] 0.47 Flow Multiplier 1.00 Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.01 cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef DA -N Post Parking 0.13 0 0.90 DA -N Post Grass 0.21 0 0.20 Overall Approximation 0.34 NA 0.47 TIME CONCENTRATION -- User Defined] Time of Concentration (To) RAINFALL DESCRIPTION] 8.07 (min) Distribution Type = Synthetic Total Precipitation = 0.60 (in) Return Period = 2 (yr) Storm Duration = 0.13 (hr)Number: Dominion Development Resources, LLC Page 8 434) 979 -8121 Tip Top, SWM -1 w Hydraulic Calculations Name: DA -N 10 Year Type: Modified Rational HYDROGRAPH INFORMATION] Peak Flow (Qp)0.96 cfs) Time to Peak (Tp)8.07 min) Time of Base (Tb)20.18 min) Volume 0.01 ac -ft) Time Step 1.00 min) Flow Multiplier 1.00 RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier 1.00 Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.01 cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] Description Area CM Runoff Coef DA-N Post Parking 0.13 0 0.90 DA -N Post Grass 0.21 0 0.20 Overall Approximation 0.34 NA 0.47 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc)8.07 min) RAINFALL DESCRIPTION] Distribution Type Synthetic Total Precipitation 0.81 in) Return Period User Defined (yr) Storm Duration 0.13 hr) Dominion Development Resources, LLC Page 9 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] DA -N 100 Year Modified Rational Peak Flow (Qp)1.35 cfs) Time to Peak (Tp)8.07 min) Time of Base (Tb)20.18 min) Volume 0.02 ac -ft) Time Step 1.00 min) Flow Multiplier 1.00 0.34 RATIONAL HYDROGRAPH INFORMATION] 0.47 Flow Multiplier 1.00 Receding Limb Factor 1.50 APPROXIMATE STORAGE] Maximum Outflow 0.00 cfs) Maximum Storage 0.02 cu ft) BASIN INFORMATION] WEIGHTED WATERSHED AREA] RAINFALL DESCRIPTION] Description Area CN Runoff Coef DA -M Post Parking 0.13 0 0.90 DA -M Post Grass 0.21 0 0.20 Overall Approximation 0.34 NA 0.47 TIME CONCENTRATION -- User Defined] Time of Concentration (Tc)8.07 min) RAINFALL DESCRIPTION] Distribution Type Synthetic Total Precipitation 1.14 in) Return Period 100 yr) Storm Duration 0.13 hr) Dominion Development Resources, LLC Page 10 434) 979 -8121 Tip Top, SWM -1 -. Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] Post 2 -Year Combined Peak Flow (Qp)1.95 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.03 ac -ft) Time Step 1.00 min) COMBINED HYDROGRAPH RECORDS] Hydrograph Number:2 Name: DA -N_ 2 Year Type: Modified Rational Peak Flow (Qp) = 1.25 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Hydrograph Number:3 Name: DA -N 2 Year Type: Modified Rational Peak Flow (Qp) = 0.71 (cfs) Time to Peak (Tp) = 8.07 (min) Time Step = 1.00 (min) Dominion Development Resources, LLC Page 11 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] Post 10 -Year Combined Peak Flow (Qp)2.63 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.03 ac -ft) Time Step 1.00 min) COMBINED HYDROGRAPH RECORDS] Hydrograph Number:4 Name: DA -N 10 Year Type: Modified Rational Peak Flow (Qp)0.96 cfs) Time to Peak (Tp)8.07 min) Time Step 1.00 min) Hydrograph Number:? Name: DA -M 10 Year Type: Modified Rational Peak Flow (Qp)1.68 cfs) Time to Peak (Tp)5.00 min) Time Step 1.00 min) Dominion Development Resources, LLC Page 12 434) 979 -8121 Tip Top, SWM -1 4 Hydraulic Calculations Name: Type: HYDROGRAPH INFORMATION] Post 100 -Year Combined Peak Flow (Qp)3.71 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.05 ac -ft) Time Step 1.00 min) COMBINED HYDROGRAPH RECORDS] Hydrograph Number:8 Name: DA -M 100 Year Type: Modified Rational Peak Flow (Qp)2.37 cfs) Time to Peak (Tp)5.00 min) Time Step 1.00 min) Hydrograph Number:5 Name: DA -N 100 Year Type: Modified Rational Peak Flow (Qp)1.35 cfs) Time to Peak (Tp)8.07 min) Time Step 1.00 min) Dominion Development Resources, LLC Page 13 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: SWM Facility RATING CURVE LIMIT] Maximum Storage = 3286.20 (cu ft) Maximum Discharge = 13.08 (cfs) Dominion Development Resources, LLC Page 14 434) 979 -8121 Minimum Elevation 475.00 ft) Maximum Elevation 480.30 ft) Elevation Increment 0.10 ft) STAGE STORAGE INFORMATION] Storage Method: User Defined Storage Input Method: Area Number Elevation Area Ave Area Volume Cumulative Volume ft)sq ft)sq ft)cu ft)cu ft) 1 477.99 0.00 0.00 0.00 0.00 2 478.00 917.90 458.95 4.59 4.59 3 480.00 1777.00 1347.45 2694.90 2699.49 4 480.30 1859.00 1818.00 545.40 3244.89 DISCHARGE INFORMATION] Structure Number:1 Type: Name:SWM Outlet Structure Elevation Stage Area Storage Discharge ft)ft)sq ft)cu ft)cfs) 478.00 3.00 917.90 45.89 0.00 478.10 3.10 960.86 139.83 0.00 478.20 3.20 1003.81 238.07 0.00 478.30 3.30 1046.17 340.59 0.00 478.40 3.40 1089.72 447.42 0.00 478.50 3.50 1132.68 558.54 0.00 478.60 3.60 1175.63 613.95 0.10 478.70 3.70 1218.58 793.66 0.27 478.80 3.80 1261.54 917.67 0.50 418.90 3.90 1304.49 1045.97 0.77 479.00 4.00 1347.45 1178.57 1.08 479.10 4.10 1390.41 1315.46 1.98 479.20 4.20 1433.36 1456.65 3.39 479.30 4.30 1476.32 1602.13 5.12 479.40 4.40 1519.27 1751.91 7.13 479.50 4.50 1562.22 1905.99 9.22 479.60 4.60 1605.18 2064.36 11.00 419.70 4.70 1648.13 2227.02 12.18 479.80 4.80 1691.09 2393.99 12.34 479.90 4.90 1734.04 2565.24 12.49 480.00 5.00 1771.00 2740.79 12.64 480.10 5.10 1804.33 2919.86 12.79 480.20 5.20 1831.67 3101.66 12.93 480.30 5.30 1859.00 3286.20 13.08 Maximum Storage = 3286.20 (cu ft) Maximum Discharge = 13.08 (cfs) Dominion Development Resources, LLC Page 14 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Type Name RATING CURVE LIMIT] Minimum Elevation Maximum Elevation Elevation Increment STAND PIPE INFORMATION] Stand Pipe SWM Outlet Structure ORIFICE INFORMATION] Diameter Crest Length Effective Crest Length Orifice Coefficient Fractional Open Area ORIFICE EQUATION] Q = Co *A((2gh) /k)"0.5 DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (sq ft) WEIR INFORMATION] 475.00 (ft) 480.00 (ft) 0.10 (ft) 2.00 ft) 6.28 ft) 5.37 ft) 0.60 0.70 Crest Elevation = 479.00 (ft) Weir Coefficient = 3.33 Exponential = 1.50 WEIR EQUATION] Q = Cw * L * H^exp DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert It L = Crest lengtt ft Structure Number 1 Type Rectangular Weir Suppressed WEIR INFORMATION] Crest Length = 0.92 (ft) Crest Elevation = 478.50 (ft) Weir Coefficient = 3.33 Exponential = 1.50 RECTANGULAR SUPRESSED EQUATION] Q = Cw * L * H"exp DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest length Dominion Development Resources, LLC Page 15 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations CULVERT INFORMATION] Type : Circular Concrete - Square Edge with Headwall OUTLET STRUCTURE INFORMATION] Diameter = 15.00 (in) Invert Elevation = 475.00 (ft) Pipe Length = 53.09 (ft) Slope = 0.09 Manning's n Value = 0.01 Orifice Coefficient = 0.60 Tailwater Elevation = 474.50 (ft) Number of Barrels = I UNSUBMERGED EQUATION] H /Diam = Hc/ Diam +K *(Q /(A *Diam ^0.5)) ^ M -0.5 *S Coefficient K = 0.01 Coefficient M = 2.00 Q Maximum = 4.80 SUBMERGED EQUATION] H /Diam = c *(Q /(A *Diam ^0.5)) ^2 +Y -0.5 *S Coefficient c = 0.04 Coefficient Y = 0.67 Q Minimum = 5.49 DEFINITIONS] H Headwater depth above inlet control section invert,ft) Diam Interior height of culvert barrel, (ft) He Specific head at critical depth (dc +Vc ^2/2g),ft) Q Discharge,cfs) A Full cross sectional area of culvert barrel,sq ft) S Culvert barrel slope,ft /ft) STAND PIPE STAGE VS.DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert Total ft)ft)cfs)cfs)cfs)cfs)cfs) 475.00 0.00 0.00 0.00 0.00 0.00 0.00 475.10 0.10 0.00 0.00 0.00 0.09 0.00 475.20 0.20 0.00 0.00 0.00 0.25 0.00 475.30 0.30 0.00 0.00 0.00 0.46 0.00 475.40 0.40 0.00 0.00 0.00 0.73 0.00 475.50 0.50 0.00 0.00 0.00 1.06 0.00 475.60 0.60 0.00 0.00 0.00 1.42 0.00 475.70 0.70 0.00 0.00 0.00 1.81 0.00 475.80 0.80 0.00 0.00 0.00 2.22 0.00 475.90 0.90 0.00 0.00 0.00 2.65 0.00 476.00 1.00 0.00 0.00 0.00 3.09 0.00 476.10 1.10 0.00 0.00 0.00 3.53 0.00 476.20 1.20 0.00 0.00 0.00 3.97 0.00 476.30 1.30 0.00 0.00 0.00 4.41 0.00 476.40 1.40 0.00 0.00 0.00 4.80 0.00 476.50 1.50 0.00 0.00 0.00 5.49 0.00 Dominion Development Resources, LLC Page 16 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations 476.60 1.60 0.00 0.00 0.00 5.57 0.00 476.70 1.70 0.00 0.00 0.00 5.90 0.00 476.80 1.80 0.00 0.00 0.00 6.22 0.00 476.90 1.90 0.00 0.00 0.00 6.51 0.00 477.00 2.00 0.00 0.00 0.00 6.80 0.00 477.10 2.10 0.00 0.00 0.00 7.07 0.00 477.20 2.20 0.00 0.00 0.00 7.33 0.00 477.30 2.30 0.00 0.00 0.00 7.59 0.00 477.40 2.40 0.00 0.00 0.00 7.83 0.00 477.50 2.50 0.00 0.00 0.00 8.07 0.00 477.60 2.60 0.00 0.00 0.00 8.30 0.00 477.70 2.70 0.00 0.00 0.00 8.53 0.00 477.80 2.80 0.00 0.00 0.00 8.75 0.00 477.90 2.90 0.00 0.00 0.00 8.96 0.00 478.00 3.00 0.00 0.00 0.00 9.17 0.00 478.10 3.10 0.00 0.00 0.00 9.37 0.00 478.20 3.20 0.00 0.00 0.00 9.57 0.00 478.30 3.30 0.00 0.00 0.00 9.77 0.00 478.40 3.40 0.00 0.00 0.00 9.96 0.00 478.50 3.50 0.00 0.00 0.00 10.15 0.00 478.60 3.60 0.10 0.00 0.00 10.33 0.10 478.70 3.70 0.27 0.00 0.00 10.51 0.27 478.80 3.80 0.50 0.00 0.00 10.69 0.50 478.90 3.90 0.77 0.00 0.00 10.87 0.77 479.00 4.00 1.08 0.00 0.00 11.04 1.08 479.10 4.10 1.42 0.00 0.57 11.21 1.98 479.20 4.20 1.79 0.00 1.60 11_.38 3.39 479.30 4.30 2.18 0.00 2.94 11.54 5.12 479.40 4.40 2.61 0.00 4.52 11.71 7.13 479.50 4.50 3.05 0.00 6.17 11.87 9.22 479.60 4.60 3.52 0.00 7.48 12.02 11.00 479.70 4.70 4.01 0.00 8.79 12.18 12.18 479.80 4.80 4.53 0.00 9.47 12.34 12.34 479.90 4.90 5.06 0.00 10.04 12.49 12.49 480.00 5.00 5.61 0.00 10.58 12.64 12.64 WEIR STAGE VS. DISCHARGE] Elevation Stage Weir 1 Weir 2 Weir 3 Weir 4 Total ft)ft)cfs)cfs)CIS)cfs)cfs) 475.00 0.00 0.00 0.00 0.00 0.00 0.00 475.10 0.10 0.00 0.00 0.00 0.00 0.00 475.20 0.20 0.00 0.00 0.00 0.00 0.00 475.30 0.30 0.00 0.00 0.00 0.00 0.00 475.40 0.40 0.00 0.00 0.00 0.00 0.00 475.50 0.50 0.00 0.00 0.00 0.00 0.00 475.60 0.60 0.00 0.00 0.00 0.00 0.00 475.70 0.70 0.00 0.00 0.00 0.00 0.00 475.80 0.80 0.00 0.00 0.00 0.00 0.00 475.90 0.90 0.00 0.00 0.00 0.00 0.00 476.00 1.00 0.00 0.00 0.00 0.00 0.00 476.10 1.10 0.00 0.00 0.00 0.00 0.00 476.20 1.20 0.00 0.00 0.00 0.00 0.00 Dominion Development Resources, LLC Page 17 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations 476.30 1.30 0.00 0.00 0.00 0.00 0.00 476.40 1.40 0.00 0.00 0.00 0.00 0.00 476.50 1.50 0.00 0.00 0.00 0.00 0.00 476.60 1.60 0.00 0.00 0.00 0.00 0.00 476.70 1.70 0.00 0.00 0.00 0.00 0.00 476.80 1.80 0.00 0.00 0.00 0.00 0.00 476.90 1.90 0.00 0.00 0.00 0.00 0.00 477.00 2.00 0.00 0.00 0.00 0.00 0.00 477.10 2.10 0.00 0.00 0.00 0.00 0.00 477.20 2.20 0.00 0.00 0.00 0.00 0.00 477.30 2.30 0.00 0.00 0.00 0.00 0.00 477.40 2.40 0.00 0.00 0.00 0.00 0.00 477.50 2.50 0.00 0.00 0.00 0.00 0.00 477.60 2.60 0.00 0.00 0.00 0.00 0.00 477.70 2.70 0.00 0.00 0.00 0.00 0.00 477.80 2.80 0.00 0.00 0.00 0.00 0.00 477.90 2.90 0.00 0.00 0.00 0.00 0.00 478.00 3.00 0.00 0.00 0.00 0.00 0.00 478.10 3.10 0.00 0.00 0.00 0.00 0.00 478.20 3.20 0.00 0.00 0.00 0.00 0.00 478.30 3.30 0.00 0.00 0.00 0.00 0.00 478.40 3.40 0.00 0.00 0.00 0.00 0.00 478.50 3.50 0.00 0.00 0.00 0.00 0.00 478.60 3.60 0.10 0.00 0.00 0.00 0.10 478.70 3.70 0.27 0.00 0.00 0.00 0.27 478.80 3.80 0.50 0.00 0.00 0.00 0.50 478.90 3.90 0.77 0.00 0.00 0.00 0.77 479.00 4.00 1.08 0.00 0.00 0.00 1.08 479.10 4.10 1.42 0.00 0.00 0.00 1.42 479.20 4.20 1.79 0.00 0.00 0.00 1.79 479.30 4.30 2.18 0.00 0.00 0.00 2.18 479.40 4.40 2.61 0.00 0.00 0.00 2.61 479.50 4.50 3.05 0.00 0.00 0.00 3.05 479.60 4.60 3.52 0.00 0.00 0.00 3.52 479.70 4.70 4.01 0.00 0.00 0.00 4.01 479.80 4.80 4.53 0.00 0.00 0.00 4.53 479.90 4.90 5.06 0.00 0.00 0.00 5.06 480.00 5.00 5.61 0.00 0.00 0.00 5.61 Dominion Development Resources, LLC Page 18 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Type Trapezoidal Weir Name Emergency Spillway RATING CURVE LIMIT] Minimum Elevation 477.90 ft) Maximum Elevation 480.00 ft) Elevation Increment 0.10 ft) OUTLET STRUCTURE INFORMATION] Crest Length 4.00 ft) Angle of Walls 33.3300 Crest Elevation 479.20 ft) Weir Coefficient 3.33 Exponential 1.50 TRAPEZOIDAL EQUATION] Q = Cw ( L + 0.8H * tan ( ang /2.0 )H ^exp DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest lenght ang = Angle of the walls MAXIMUM DISCHARGE] Q 9.99 cfs) WEIR STAGE VS. DISCHARGE] Elevation (ft) Stage (ft)Discharge (cfs) 477.90 0.00 0.00 478.00 0.10 0.00 478.10 0.20 0.00 478.20 0.30 0.00 478.30 0.40 0.00 478.40 0.50 0.00 478.50 0.60 0.00 478.60 0.70 0.00 478.70 0.80 0.00 478.80 0.90 0.00 478.90 1.00 0.00 479.00 1.10 0.00 479.10 1.20 0.00 479.20 1.30 0.00 479.30 1.40 0.42 479.40 1.50 1.21 479.50 1.60 2.23 479.60 1.70 3.45 479.70 1.80 4.85 479.80 1.90 6.41 479.90 2.00 8.13 480.00 2.10 9.99 Dominion Development Resources, LLC Page 19 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: 2 Year Routed Type: Reservoir: Modified Puls HYDROGRAPH INFORMATION] Peak Flow (Qp)0.56 (cfs) Time to Peak (Tp)14.00 (min) Time of Base (Tb)327.00 (min) Volume 0.01 (ac -ft) Time Step 1.00 (min) Peak Elevation 478.80 (ft) Detention Time NA RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = SWM Facility Storage Type = User - Defined Area Maximum Storage = 3286.20 (cu ft) Maximum Discharge = 13.08 (cfs) INFLOW HYDROGRAPH INFORMATION] Number 9 Name Post 2 -Year Peak Flow (Qp)1.95 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.03 ac -ft) Flow Multiplier 1.00 Dominion Development Resources, LLC Page 20 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: 10 Year Routed Type: Reservoir: Modified Puls HYDROGRAPH INFORMATION] Peak Flow (Qp)0.97 (cfs) Time to Peak (Tp)14.00 (min) Time of Base (Tb)358.00 (min) Volume 0.02 (ac -ft) Time Step 1.00 (min) Peak Elevation 478.97 (ft) Detention Time NA RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = SWM Facility Storage Type = User - Defined Area Maximum Storage = 3286.20 (cu ft) Maximum Discharge = 13.08 (cfs) INFLOW HYDROGRAPH INFORMATION] Number 10 Name Post 10 -Year Peak Flow (Qp)2.63 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.03 ac -ft; Flow Multiplier 1.00 Dominion Development Resources, LLC Page 21 434) 979 -8121 Tip Top, SWM -1 Hydraulic Calculations Name: 100 Year Routed Type: Reservoir: Modified Puls HYDROGRAPH INFORMATION] Peak Flow (Qp)2.21 (cfs) Time to Peak (Tp)12.00 (min) Time of Base (Tb)360.00 (min) Volume 0.04 (ac -ftj Time Step 1.00 (min) Peak Elevation 479.12 (ft) Detention Time NA RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = SWM Facility Storage Type = User - Defined Area Maximum Storage = 3286.20 (cu ft) Maximum Discharge = 13.08 (cfs) INFLOW HYDROGRAPH INFORMATION] Number 11 Name Post 100 -Year Peak Flow (Qp)3.71 cfs) Time to Peak (Tp)8.00 min) Time of Base (Tb)20.00 min) Volume 0.05 ac -ft) Flow Multiplier 1.00 Dominion Development Resources, LLC Page 22 434) 979 -8121 w .' { yii ". X11. : s, ,t_ o-s "- s.` ;g ='°a4.