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HomeMy WebLinkAboutWPO200800051 Calculations Stormwater Management Plan 2008-05-01 Mt. Calvary Baptist Church-- Dominion Developme: iZesources, LLC Storm Water Calculations May 1, 2008 The Albemarle County Water Protection Ordinance requires that the post-development peak rate of runoff from land development shall not exceed the pre-development peak rate of runoff for two and ten year storm events. Chapter 5 of the Virginia Stormwater Management Handbook provides guidelines for performing various engineering calculations associated with the design of stormwater management facilities. The modified rational method discussed in that reference is used here. The critical storm was determined for the 2 and 10-year storms by trial-and-error. That is, the storm duration was increased in increments until the maximum storage and outflow was reached, the critical storm, for each drainage area. Drain Area#1 Pre-Development i,-r+****1* 43*******,#k*********** HYDRO **** ********************************* VERSION 2.2 **** Area Number C Area (ac) CA 1 0.900 0.130 0.117 0.300 0.570 0.171 Weighted Totals: 0.411 0.700 0.288 Time of concentration= 5 min Period Intensity Peak Flow (years) (in/hr) (cfs) 2 5.40 1.56 1.6 cfs allowable 5 6.35 1.83 10 7.10 2.04 2.0 cfs allowable 25 8.00 2.30 50 8.90 2.56 150 9.60 2.76 Post-Development Area Number C Area (ac) CA 1 0.900 0.380 0.342 0.300 0.320 0.096 Weighted Totals: 0.626 0.700 0.438 Time of concentration= 5 min Period Intensity Peak Flow (years) ;in/hr) (cfs) 2 5.40 2.37 5 6.35 2.78 10 7.10 3.11 25 8.00 3.50 50 8.90 3.90 100 9.60 4.20 Mt. Calvary Baptist Church Y- Dominion Developme, ttesources, LLC Storm Water Calculations May 1, 2008 Storage Pipe Geometry (MC1.STO) 1: Downstream Invert Elevation (ft) 189.51 2: Downstream Manhole Area (sq ft) 12.50 3: Upstream Invert Elevation (ft) 190.00 4: Upstream Manhole Area (sq ft) 12.50 5: Pipe Diameter (in) 30.00 6: Pipe Length (ft) 115.00 Structures (MC1.STR) (Types: 1:Weir; 2:Pipe; 3:Riser) Structure 1 1: Type 2: Pipe Weir: 2: Elevation (ft) 0.00 3: Length (ft) 0.00 4: Coefficient 0.00 Riser: 5: Elevation (ft) 0.00 6: Inlet Area (sf) 0.00 7: Inlet Perimeter (ft) 0.00 8: Orifice Elevation (ft) 0.00 9: Orifice Diameter (in) 0.00 10: Orifice Elevation (ft) 0.00 11: Orifice Diameter (in) 0.00 12: Orifice Elevation (ft) 0.00 13: Orifice Diameter (in) 0.00 Pipe: 14: Invert Elevation (ft) 189.51 15: Diameter (in) 12.00 16: Orifice Diameter (in) 7.00 17: Length (ft) 4.72 18: Manninq's n 0.013 19: Slope (ft/ft) 0.010 20: Entrance Loss Coefficient 0.5 Surface: 21: Initial Elevation (ft) 189.51 *****************+**+****+******* VERSION 5.4 **+**** Control: RW - Riser acting as a weir RO - Riser acting as an orifice PI = Horizontal pipe in inlet control PO - Horizontal pipe in outlet control 2-Year; 5-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.47 0.2 PI 0.15 189.76 8.94 2.0 0.95 0.4 PI 0.41 189.97 33.51 3.0 1.42 0.7 PO 0.66 190.16 72.43 4.0 1.89 0.9 PI 0.94 190.37 12.3.72 5.0 2.37 1.1 PI 1.11 190.60 190.12 6.0 2.08 1.2 PI 1.25 190.81 253.33 7.0 1.80 1.3 PI 1.33 190.95 294.88 8.0 1.52 1.4 PI 1.37 19i.01 315.30 9.0 1.23 1.4 PI 1.37 191.01 315.49 < 1.6 cfs 10.0 0.95 1.3 PI 1.34 190.96 298.22 11.0 0.67 1.3 P1 1 .28 190.86 268.26 12.0 0.38 1.2 P1 1.19 190.72 225.75 Mt. Calvary Baptist Church Dominion Development-Resources,esources, LLC Storm Water Calculations May 1, 2008 2-Year; 10-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.37 0.1 PI 0.12 189.72 6.63 2.0 0.74 0.3 PI 0.33 189.92 25.13 3.0 1.10 0.4 PO 0.41 190.10 58.94 4.0 1.47 0.9 PI 0.87 190.27 98.61 5.0 1.84 1.0 PI 0.99 190.43 142.31 6.0 1.84 1.1 PI 1.10 190.59 187.81 7.0 1.84 1.2 PI 1.19 190.73 229.21 8.0 1.84 1.3 PI 1.27 190.85 266.89 9.0 1.84 1.3 PI 1.34 190.97 301.18 10.0 1.84 1.4 PI 1.40 191.06 329.34 11.0 1.62 1.4 PI 1.44 191.13 351.00 12.0 1.40 1.4 PI 1.45 191.14 355.06 < 1.6 cfs CRITICAL STORM 13.0 1.18 1.4 PI 1.43 191.11 345.67 14.0 0.96 1.4 PI 1.39 191.04 324.36 15.0 0.74 1.3 PI 1.32 190.93 291.36 16.0 0.52 1.2 PI 1.24 190.81 252.04 17.0 0.30 1.1 PI 1.14 190.65 204.87 2-Year; 15-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.30 0.1 PI 0.10 189.70 5.36 2.0 0.60 0.3 PI 0.28 189.87 19.82 3.0 0.89 0.5 PI 0.48 190.02 41.47 4.0 1.19 0.6 PO 0.63 190.16 70.70 5.0 1.49 0.9 PI 0.88 190.29 103.78 6.0 1.49 1.0 PI 0.98 190.42 137.35 7.0 1.49 1.0 PT 1.05 190.51 164.29 8.0 1.49 1.1 PI 1.10 190.60 188.37 9.0 1.49 1.2 PI 1.15 190.67 209.90 10.0 1.49 1.2 PI 1.19 190.73 229.12 11.0 1.49 1.2 PI 1.23 190.79 246.28 12.0 1.49 1.3 PI 1.26 190.84 261.58 13.0 1.49 1.3 PI 1.29 190.88 275.21 14.0 1.49 1.3 PI 1.31 190.92 287.34 15.0 1.49 1.3 PI 1.34 190.96 298.12 16.0 1.31 1.3 PI 1.34 190.97 302.12 < 1.6 cfs 17.0 1.13 1.3 PI 1.33 190.94 294.43 18.0 0.95 1.3 PI 1.29 190.89 276.36 19.0 0.78 1.2 PI 1.24 190.81 252.18 20.0 0.60 1.2 PI 1.18 190.70 220.77 21.0 0.42 1.1 PI 1.09 190.58 183.11 22.0 0.24 1.0 PI 0.99 190.43 140.12 10-Year; 5-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.62 0.2 PI 0.20 189.80 12.57 2.0 1.24 0.2 PO 0.25 190.08 53.94 3.0 1.87 0.9 PI 0.91 190.33 113.08 4.0 2.49 1.1 PI 1.09 190.58 183.76 5.0 3.11 1.3 PI 1.30 19C.90 280.66 6.0 2.74 1.5 PI 1.48 191.20 372.65 7.0 2.36 1.6 PI 1.60 191.40 433.64 8.0 1.99 1.7 PI 1.66 191.51 466.82 9.0 1.62. 1.7 PI 1.68 191.54 474.45 < 2.0 cfs 10.0 1.25 1.7 PI 1.65 191.49 461.47 11.0 0.88 1.6 PI 1.59 191.38 429.22 12.0 0.50 1.5 PI 1.49 191.21 378.19 Mt. Calvary Baptist Church- Dominion Developme -Resources, LLC Storm Water Calculations May 1, 2008 10-Year; 10-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) )cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.49 0.2 PI 0.15 189.76 9.20 2.0 0.98 0.4 PI 0.42 189.98 34.81 3.0 1.47 0.7 PO 0.69 190.17 74.90 4.0 1.96 1.0 PI 0.95 190.38 128.49 5.0 2.45 1.1 PI 1.13 190.63 198.64 6.0 2.45 1 .3 PI 1.29 190.88 274.51 7.0 2.45 1.4 PI 1.42 191.09 340.43 8.0 2.45 1.5 P1 1.53 191.28 399.17 9.0 2.45 1.6 PI 1.63 191.46 451.77 10.0 2.45 1.7 PI 1.73 191.63 499.06 11.0 2.16 1.8 PI 1.80 191.76 532.90 12.0 1.87 1.8 PI 1.82 191.81 545.34 < 2.0 cfs CRITICAL STORM 13.0 1.57 1.8 PI 1.81 191.79 540.41 14.0 1.28 1.8 PI 1.77 191.70 518.45 15.0 0.98 1.7 PI 1.69 191.57 482.42 16.0 0.69 1.6 PI 1.60 191.41 436.33 17.0 0.40 1.5 PI 1.49 191.21 376.50 10-Year; 15-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 189.51 0.00 1.0 0.41 0.1 PI 0.13 189.73 7.44 2.0 0.82 0.4 PI 0.37 189.94 28.54 3.0 1.24 0.5 PO 0.54 190.13 65.25 4.0 1.65 0.9 PI 0.89 190.30 107.01 5.0 2.06 1.0 PI 1.04 190.50 160.42 6.0 2.06 1.2 PI 1.17 190.69 216.56 7.0 2.06 1.3 PI 1.28 190.86 268.15 8.0 2.06 1.4 PI 1.36 191.00 312.43 9.0 2.06 1 .4 PI 1.44 191.13 351.77 10.0 2.06 1.5 PI 1.51 191.24 386.82 11.0 2.06 1.6 PI 1.57 191.35 418.10 12.0 2.06 1.6 PI 1.62 191.44 446.04 13.0 2.06 1.7 PI 1.67 191.53 470.97 14.0 2.06 1.7 PI 1.71 191.61 493.19 15.0 2.06 1.8 PI 1.75 191.68 512.96 16.0 1.81 1.8 PI 1.78 191.72 523.29 < 2.0 cfs 17.0 1.57 1.8 PI 1.77 191.70 519.00 18.0 1.32 1.7 PI 1.73 191.64 502.68 19.0 1.07 1.7 PI 1.68 191.54 474.71 20.0 0.83 1.6 PI 1.60 191.40 435.30 21.0 0.58 1.5 PT 1.50 191.24 384.65 22.0 0.33 1 .4 PI 1.39 191.04 322.95 4 Mt. Calvary Baptist Church-- Dominion Developmcm Resources, LLC Storm Water Calculations May 1, 2008 Drain Area#2 Pre-Development Area Number C Area (ac) CA 1 0.300 0.360 0.108 Weighted Totals: 0.300 0.360 0.108 Time of concentration= 5 min Period Intensity Peak Flow (years) (in/hr) (cfs) 2 5.40 0.58 0.6 cfs allowable 5 6.35 0.69 10 7.10 0.77 0.8 cfs allowable 25 8.00 0.86 50 8.90 0.96 100 9.60 1.04 Post-Development Area Number C Area (ac) CA 1 0.900 0.220 0.198 2 0.300 0.140 0.042 Weighted Totals: 0.667 0.360 0.240 Time of concentration= 5 min Period Intensity Peak Flow (years) (in/hr) (cfs) 5.40 1.30 5 6.35 1.52 10 7.10 1.70 25 8.00 1.92 50 8.90 2.14 100 9.60 2.30 Raintank Geometry (MC2.STO) Section Elevation Volume (ft) (cu ft) 1 182.50 0.00 183.00 116.10 3 184.00 343.60 9 185.00 394.00 Structures (MC2.STR) (Types: 1:Weir; 2:Pipe; 3:Riser) Structure 1 1: Type Pipe Weir: Elevation (ft) 0.00 3: Length (ft) 0.00 4: Coefficient 0.00 Riser: 5: Elevation (ft) 0.00 6: Inlet Area (sf) 0.00 7: Inlet Perimeter (ft) 0.00 8: Orifice Elevation (ft) 0.00 9: Orifice Diameter (in) 0.00 10: Orifice Elevation (ft) 0.00 11: Orifice Diameter (in) 0.00 12: Orifice Elevation (ft) 0.00 13: Orifice Diameter (in) 0.00 Pipe: 14: Invert Elevation (ft) 182.50 15: Diameter (in) 4.00 16: Orifice Diameter (in) 4.00 17: Length (ft) 10.00 18: Manning's n 0.013 Mt. Calvary Baptist Church.,. Dominion DevelopmerrrResources, LLC Storm Water Calculations May 1, 2008 19: Slope (ft/ft) 0.020 20: Entrance Loss Coefficient 0.5 Surface: 21: Initial Elevation (ft) 182.50 2-Year; 5-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.26 0.0 PI 0.00 182.52 9.81 2.0 0.52 0.0 P1 0.02 182.58 34.45 3.0 0.78 0.1 PI 0.08 182.73 71.39 4.0 1.04 0.2 PI 0.22 182.96 117.70 5.0 1.30 0.3 P1 0.32 183.28 171.83 6.0 1.14 0.4 PI 0.40 183.62 223.45 7.0 0.99 0.5 PI 0.47 183.89 261.14 8.0 0.83 0.5 PI 0.51 184.08 286.34 9.0 0.68 0.5 PI 0.53 184.19 301.18 10.0 0.52 0.5 PI 0.54 184.22 304.46 < 0.6 cfs 11.0 0.36 0.5 PI 0.53 784.18 299.48 12.0 0.21 0.5 PI 0.51 184.07 285.54 2-Year; 10-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.20 0.0 PI 0.00 182.51 7.79 2.0 0.40 0.0 PI 0.01 182.56 27.30 3.0 0.60 0.0 PI 0.05 182.67 56.77 4.0 0.81 0.2 PI 0.15 182.84 93.69 5.0 1.01 0.3 PI 0.26 183.07 136.49 6.0 1.01 0.3 PI 0.33 183.33 179.58 7.0 1.01 0.4 PI 0.40 183.59 218.37 8.0 1.01 0.5 PI 0.45 183.83 253.38 9.0 1.01 0.5 PI 0.51 184.07 285.05 10.0 1.01 0.6 PI 0.55 184.29 313.73 11.0 0.89 0.6 PI 0.59 184.48 337.43 12.0 0.77 0.6 PI 0.62 184.60 351.56 13.0 0.65 0.6 PI 0.62 184.64 357.03 < 0.6 cfs 14.0 0.53 0.6 P1 0.62 184.62 354.97 15.0 0.40 0.6 PI 0.61 184.56 346.68 16.0 0.28 0.6 PI 0.58 184.44 332.71 17.0 0.16 0.6 PI 0.55 184.28 312.00 • 2-Year; 15-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.16 0.0 PI 0.00 182.51 6.41 2.0 0.33 0.0 PI 0.01 182.55 22.43 3.0 0.49 0.0 PI 0.03 182.63 46.74 4.0 0.65 0.1 PI 0.10 182.76 77.66 5.0 0.82 0.2 PI 0.22 182.94 113.07 6.0 0.82 0.3 PI 0.28 183.13 147.52 7.0 0.82 0.3 PI 0.33 183.32 178.47 8.0 0.82 0.4 PI 0.38 183.50 206.36 9.0 0.82 0.4 PI 0.42 183.68 231.53 10.0 0.82 0.5 PI 0.46 183.84 254.28 11.0 0.82 0.5 PI 0.49 183.99 274.87 12.0 0.82 0.5 PI 0.52 184.14 294.70 13.0 0.82 0.6 PI 0.55 184.28 312.49 14.0 0.82 0.6 PI 0.58 184.41 328.46 15.0 0.82 0.6 PI 0.60 184.52 342.83 16.0 0.72 0.6 PI 0.62 184.61 352.83 17.0 0.62 0.6 PI 0.62 184.63 355.96 = 0.6 cfs CRITICAL STORM 18.0 0.52 0.6 PI 0.62 184.61 353.27 19.0 0.43 0.6 PI 0.61 184.55 345.62 20.0 0.33 0.6 PI 0.59 184.45 333.46 21.0 0.23 0.6 PI 0.56 184.31 315.84 22.0 0.13 0.5 PI 0.52 184.14 294.27 t Mt. Calvary Baptist Church-- Dominion Development-Resources, LLC Storm Water Calculations May 1, 2008 2-Year; 20-Min Storm Time Inflow Pipe Total E1ev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 5.0 0.69 0.2 PI 0.16 182.85 97.05 6.0 0.69 0.2 PI 0.24 183.01 126.55 7.0 0.69 0.3 PI 0.28 183.16 152.17 8.0 0.69 0.3 PI 0.32 183.30 175.22 9.0 0.69 0.4 PI 0.36 183.44 195.99 10.0 0.69 0.4 PI 0.39 183.56 214.74 11.0 0.69 0.4 PI 0.42 183.68 231.69 12.0 0.69 0.4 PI 0.44 183.79 247.01 13.0 0.69 0.5 PO 0.47 183.90 262.08 14.0 0.69 0.5 PO 0.48 184.00 275.76 15.0 0.69 0.5 PO 0.50 184.09 288.27 16.0 0.69 0.5 PO 0.52 184.18 299.73 17.0 0.69 0.5 PO 0.53 184.26 310.25 18.0 0.69 0.5 PO 0.54 184.34 319.93 19.0 0.69 0.6 PO 0.55 184.41 328.84 20.0 0.69 0.6 PO 0.56 184.48 337.05 21.0 0.60 0.6 PO 0.57 184.52 342.12 < 0.6 cfs 22.0 0.52 0.6 PO 0.57 184.52 341.81 23.0 0.44 0.6 PO 0.56 184.48 337.17 24.0 0.36 0.6 PO 0.55 184.41 328.47 25.0 0.28 0.5 PO 0.54 184.31 316.03 26.0 0.19 0.5 PO 0.51 184.17 298.55 27.0 0.11 0.5 PO 0.49 184.01 277.62 10-Year; 5-Min Storm Time Inflow Pipe Total E1ev Storage (min) (cfs) (cfs) (cfs) ift) (en ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.34 0.0 PI 0.00 182.52 12.62 2.0 0.68 0.0 PI 0.03 182.62 44.35 3.0 1.02 0.1 PI 0.14 182.83 91.36 4.0 1.36 0.3 PI 0.28 183.15 150.99 5.0 1.70 0.4 PI 0.40 183.62 222.76 6.0 1.50 0.5 PI 0.52 184.12 291.14 7.0 1.30 0.6 PI 0.60 184.51 341.58 8.0 1.09 0.7 PI 0.65 184.80 375.62 9.0 0.89 0.7 PI 0.69 184.97 395.65 10.0 0.68 0.7 PI 0.70 185.01 400.94 < 0.8 cfs 11.0 U.48 0.7 PI 0.69 184.96 394.84 12.0 0.28 0.7 PI 0.66 184.82 378.23 10-Year; 10-Min Storm Time Inflow Pipe Total E1ev Storage (nun) (efs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.27 0.0 PI 0.00 182.52 10.15 2.0 0.54 0.0 PI 0.02 182.59 35.63 3.0 0.81 0.1 PI 0.09 182.74 73.78 4.0 1.08 0.2 PI 0.23 182.98 121.68 5.0 1.34 0.3 PI 0.33 183.32 177.88 6.0 1.34 0.4 PI 0.43 183.71 236.10 7.0 1.34 0.5 PI 0.51 184.10 288.67 8.0 1.34 0.6 PI 0.59 184.47 336.25 9.0 1.34 0.7 PI 0.66 184.83 379.40 10.0 1.34 0.7 PI 0.72 185.17 418.55 11.0 1.18 0.8 PI 0.77 185.45 450.49 12.0 1.02 0.8 PI 0.81 185.63 470.05 13.0 0.86 0.8 PI 0.82 185.70 478.23 < 0.8 cfs 14.0 0.70 0.8 PI 0.81 185.68 476.18 15.0 0.54 0.8 PI 0.80 185.59 465.50 16.0 0.38 0.8 PI 0.77 185.42 446.90 17.0 0.22 0.7 PI 0.73 185.18 419.93 Mt. Calvary Baptist Church -- Dominion Developmenr`Resources, LLC Storm Water Calculations May 1, 2008 10-Year; 15-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 1.0 0.23 0.0 PI 0.00 182.51 8.64 2.0 0.45 0.0 PI 0.01 182.57 30.30 3.0 0.68 0.1 PI 0.06 182.70 62.92 4.0 0.90 0.2 PI 0.19 182.89 103.62 5.0 1.13 0.3 PI 0.28 183.15 150.90 6.0 1.13 0.4 PI 0.36 183.46 199.42 7.0 1.13 0.4 PI 0.44 183.76 243.15 8.0 1.13 0.5 PI 0.50 184.05 282.67 9.0 1.13 0.6 PI 0.56 184.33 318.44 10.0 1 .13 0.6 PI 0.61 184.59 350.87 11.0 1.13 0.7 PI 0.66 184.84 380.28 12.0 1.13 0.7 PI 0.71 185.07 408.00 13.0 1.13 0.7 PI 0.75 185.29 433.03 14.0 1.13 0.8 PI 0.78 185.50 455.68 15.0 1.13 0.8 PI 0.82 185.69 476.27 16.0 0.99 0.8 PI 0.84 185.82 490.96 17.0 0.86 0.8 PI 0.85 185.87 496.21 =- 0.8 cfs CRITICAL STORM 18.0 0.72 0.8 PI 0.84 185.84 493.13 19.0 0.59 0.8 PI 0.83 185.75 482.90 20.0 0.45 0.8 PI 0.80 185.59 466.12 21.0 0.32 0.8 PI 0.76 185.39 443.38 22.0 0.18 0.7 PI 0.72 185.13 413.99 10-Year; 20-Min Storm Time Inflow Pipe Total Elev Storage (min) (cfs) (cfs) (cfs) (ft) (cu ft) 0.0 0.00 0.0 0.00 182.50 0.00 5.0 0.97 0.2 PI 0.25 183.04 132.17 6.0 0.97 0.3 PI 0.32 183.29 173.62 7.0 0.97 0.4 PI 0.38 183.54 210.93 8.0 0.97 0.4 PI 0.44 183.77 244.60 9.0 0.97 0.5 PI 0.49 183.99 275.05 10.0 0.97 0.5 PI 0.54 184.20 302.60 11.0 0.97 0.6 PI 0.58 184.40 327.57 12.0 0.97 0.6 PI 0.62 184.59 351.32 13.0 0.97 0.6 PI 0.65 184.77 372.70 14.0 0.97 0.7 PI 0.68 184.93 391.97 15.0 0.97 0.7 PI 0.71 185.09 409.36 16.0 0.97 0.7 PI 0.73 185.22 425.06 17.0 0.97 0.8 PI 0.76 185.35 439.25 18.0 0.97 0.8 PI 0.78 185.46 452.12 19.0 0.97 0.8 PI 0.80 185.57 463.78 20.0 0.97 0.8 PI 0.81 185.67 474.37 21.0 0.86 0.8 PI 0.82 185.72 480.48 < 0.8 cfs 22.0 0.74 0.8 PI 0.82 185.71 479.15 23.0 0.62 0.8 PI 0.81 185.64 471.57 24.0 0.51 0.8 PI 0.79 185.52 458.26 25.0 0.39 0.8 PI 0.76 185.35 439.74 26.0 0.27 0.7 PI 0.72 185.15 416.48 27.0 0.16 0.7 PI 0.67 184.90 387.57 In drainage area #1 detention is accomplished by using an oversized stormwater system and in drainage area #2 raintanks provide the storage for detention. In each case the outlet is restricted to attenuate the discharge and in each case the post-development discharge for the critical storm does not exceed the pre-development rate for the 2-year or 10-year storm events as required by the ordinance. 0 o 4' NUMBER m n r(9) TYPE am rn rn rn LENGTH(FT) STATION O 0 0 o DRAINAGE rn 0) V V AREA (AC) O 0 0 0 °V' w C 0 0 0 0 iv iv A A A A CA A I IN/HR O N C_ a' °' Q INCR(CFS) O 0 0 o Q CARRY OVER (CFS) v rn Co N QT GUTTER rn w FLOW v 0 0 0 0 O 0 o S GUTTER cI) SLOPE(FT/FT) - 0 c 0 0 0 o SX CROSS E cn cn N N SLOPE(FT/FT) CO N 0) A A -"' A 'I N V ^� o T(SPREAD) m 70 N N N N Z W(FT) m 0o 00 -i o 0 o SW(FT/FT) 0 SW/SX C EO m Z N co a N O O 0 SW=a/12 SE(FT/FT)=SX +SWEO LT(FT)/P EFFEC L LILT-d(FT) E-h 0 0 0 0 Q INTER N N N V CEPTED/D/H QB CARRY OVER CFS 0' w N T SPREAD AT N) °i SAG REMARKS n C I- U? < o n CD m N D n 1 JJ 0 N O O 1 u m-I II O c o , m w 3 x 0 fzi n -t, w 0 0 fl O = I-1 S II 0 • D m 7 OD \ 1_, D o CD CO Cp r+ Z p D S C7 --1 0 rn m D 0 O O x 0 (Jt CD O CO P O n O -D s v a. -IU.J (0 N i D n a O H CA n c 0 O O + r+ Z c9 0 ' U) CD CD \ r+ O I IU O O n 1 O 0 c • O c u, 0 r-r O n D O O 0 m o H CD O r o < 1 (n < N o 1 N Cr, m O I CD w I Iv < (IA [n m (N D Co m n Co a 1— S O cn O NM Z D w N n m O cn (n O -CI 1--- O Cn 3 C7 r111 o 1-1 rn �` 70 O -I _, (N O n rt _< N Q r c J I-, H co < `N 0 1-' O_ rt CD rr (II CD N N co O Protect O..0- Mtn-I.,\Pro,.cte\EnprUple\TM 88\Mount Calvary eeptaat2 pro Plat Oats/TaY' Ion May f2.2008/14.23.3D y- /©� , ,04/////////////////06... • 600 • j. • 1536-a -- 1/1 -- -s I-2C T-194 . 0 1\ / 0= 190 . 0 ,,,,,\ ''300 / 1 i/ 'i � , . ` i 1 / A\ i 0 1 i I 0 . 1 '� ac ,, / ,i / o % m o� m % m° n� __ __ ___„.. m / la N '90 / o / 0 0 . 22 ac i c. -.Tnt al, 75X y, , high ] 48' �-- 34 65:= ouble 2. / / j 1 No l / i / Il m o _ --- ■ec,,u � / / / - ■ucuc�/ i — r +alix g I PROJECT TITLE: REVISIONS REVISIONS 18.a1A[7Hl�poltCtierh no. ma�]at DMZ no mew OCR c• y ���. 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