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HomeMy WebLinkAbout10.1_SubBasinCalcs0.90 0.50 0.60 0.20 Note: Coefficients obtained from CoB Design Standards Table I-1 BASIN SDI-1A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 17131.458 0.39 0.73 0.29 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 28671.237 0.66 0.20 0.13 Totals 45802.695 1.05 0.42 Cw =0.40 BASIN SDI-2A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14188.715 0.33 0.73 0.24 Dense Residential 78790.091 1.81 0.50 0.90 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 92978.8 2.13 1.14 Cw =0.54 BASIN SDI-3A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 11693.065 0.27 0.73 0.20 Dense Residential 83159.417 1.91 0.50 0.95 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 94852.5 2.18 1.15 Cw =0.53 BASIN SDI-4A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 33137.22 0.76 0.73 0.56 Dense Residential 71787.48 1.65 0.50 0.82 Commercial 0 0.00 0.60 0.00 Open Land 28848.49 0.66 0.20 0.13 Totals 133773.19 3.07 1.51 Cw =0.49 MAJOR SUBDIVISION Weighted Runoff Coefficients URBAN + FARM PHASE 2 - BASIN A Asphalt/Concrete Dense Residential Open Land Commercial Neighborhood L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-5A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 16075.44 0.37 0.73 0.27 Dense Residential 62244.254 1.43 0.50 0.71 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 78319.7 1.80 0.98 Cw =0.55 BASIN SDI-6A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14904.38 0.34 0.73 0.25 Dense Residential 22354.22 0.51 0.50 0.26 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 37258.6 0.86 0.51 Cw =0.59 BASIN SDI-7A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 9444.42 0.22 0.73 0.16 Dense Residential 55952.76 1.28 0.50 0.64 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 65397.2 1.50 0.80 Cw =0.53 BASIN SDI-8A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14224.08 0.33 0.73 0.24 Dense Residential 94197.47 2.16 0.50 1.08 Commercial 0 0.00 0.60 0.00 Open Land 25011.01 0.57 0.20 0.11 Totals 133432.6 3.06 1.43 Cw =0.47 BASIN SDI-9A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14032.062 0.32 0.73 0.24 Dense Residential 78663.183 1.81 0.50 0.90 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 92695.2 2.13 1.14 Cw =0.53 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-10A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 19983.61 0.46 0.73 0.33 Dense Residential 161814.43 3.71 0.50 1.86 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 181798.0 4.17 2.19 Cw =0.53 BASIN SDI-11A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 12943.9 0.30 0.73 0.22 Dense Residential 85151.86 1.95 0.50 0.98 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 98095.8 2.25 1.19 Cw =0.53 BASIN SDI-12A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 28600 0.66 0.73 0.48 Dense Residential 69663.84 1.60 0.50 0.80 Commercial 0 0.00 0.60 0.00 Open Land 6419 0.15 0.20 0.03 Totals 104682.84 2.40 1.31 Cw =0.54 BASIN SDI-13A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 15199.45 0.35 0.73 0.25 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 15199.5 0.35 0.25 Cw =0.73 BASIN SDI-14A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 43414.85 1.00 0.73 0.73 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 77802.9 1.79 0.20 0.36 Totals 121217.8 2.78 1.08 Cw =0.39 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-15A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 2427.3 0.06 0.73 0.04 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 2427.3 0.06 0.04 Cw =0.73 BASIN SDI-16A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 28000.25 0.64 0.73 0.47 Dense Residential 68760.68 1.58 0.50 0.79 Commercial 0 0.00 0.60 0.00 Open Land 6303.06 0.14 0.20 0.03 Totals 103063.99 2.37 1.29 Cw =0.54 BASIN SDI-17A Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 35133.72 0.81 0.73 0.59 Dense Residential 86359.82 1.98 0.50 0.99 Commercial 0 0.00 0.60 0.00 Open Land 9694.17 0.22 0.20 0.04 Totals 131187.71 3.01 1.62 Cw =0.54 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Equations Used: Qp = C i A (Modified Rational Method) i = a * (DURATION) ^ -(b) (City of Bozeman) Overland Flow tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman) Gutter Flow V=3.28*k*(S^(1/2), where k=0.618 (paved) (FHWA HEC 22, Eqn 3-4) BASIN 1A Basin Area (ac): 1.05 Storm Event Intensity Post-Dev C (weighted): 0.40 (yr) (in/hr)A B Overland Distance (ft): 72.5 2 0.77 0.36 0.6 Overland Slope (%): 1.0 5 1.17 0.52 0.64 Gutter Flow Distance (ft): 528.0 10 1.46 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.76 0.78 0.64 Post-Dev. Tc (min): 16.9 50 2.12 0.92 0.66 Post-Dev Tc (hr): 0.28 100 2.36 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.40 0.40 0.40 0.40 Storm Intensity (in/hr): 0.77 1.46 1.76 2.36 Post-Dev Qp (cfs):0.32 0.61 0.73 0.99 BASIN 2A Basin Area (ac): 2.13 Storm Event Intensity Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 305.5 2 0.69 0.36 0.6 Overland Slope (%): 1.0 5 1.04 0.52 0.64 Gutter Flow Distance (ft): 318.0 10 1.29 0.64 0.65 Gutter Flow Slope (%): 1.02 25 1.56 0.78 0.64 Post-Dev. Tc (min): 20.4 50 1.88 0.92 0.66 Post-Dev Tc (hr.): 0.34 100 2.08 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.69 1.29 1.56 2.08 Post-Dev Qp (cfs):0.79 1.48 1.78 2.38 BASIN 3A Basin Area (ac): 2.18 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 286 2 0.70 0.36 0.6 Overland Slope (%): 1.0 5 1.06 0.52 0.64 Gutter Flow Distance (ft): 243.0 10 1.32 0.64 0.65 Gutter Flow Slope (%): 0.75 25 1.59 0.78 0.64 Post-Dev. Tc (min): 19.7 50 1.92 0.92 0.66 Post-Dev Tc (hr.): 0.33 100 2.13 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.70 1.32 1.59 2.13 Post-Dev Qp (cfs):0.81 1.52 1.83 2.45 BASIN 4A Basin Area (ac): 3.07 Storm Event Intensity Post-Dev C (weighted): 0.49 (yr) (in/hr)A B Overland Distance (ft): 410 2 0.61 0.36 0.6 Overland Slope (%): 1.0 5 0.92 0.52 0.64 Gutter Flow Distance (ft): 222.0 10 1.14 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.38 0.78 0.64 Post-Dev. Tc (min): 24.7 50 1.65 0.92 0.66 Post-Dev Tc (hr.): 0.41 100 1.83 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.49 0.49 0.49 0.49 Storm Intensity (in/hr): 0.61 1.14 1.38 1.83 Post-Dev Qp (cfs):0.93 1.72 2.08 2.77 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) URBAN + FARM PHASE 2 - BASIN A POST-DEVELOPMENT SUB BASIN FLOWS MAJOR SUBDIVISION Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 5A Basin Area (ac): 1.80 Storm Event Intensity Post-Dev C (weighted): 0.55 (yr) (in/hr)A B Overland Distance (ft): 327.5 2 0.63 0.36 0.6 Overland Slope (%): 1.0 5 0.95 0.52 0.64 Gutter Flow Distance (ft): 496.0 10 1.18 0.64 0.65 Gutter Flow Slope (%): 0.57 25 1.42 0.78 0.64 Post-Dev. Tc (min): 23.4 50 1.71 0.92 0.66 Post-Dev Tc (hr.): 0.39 100 1.90 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.55 0.55 0.55 0.55 Storm Intensity (in/hr): 0.63 1.18 1.42 1.90 Post-Dev Qp (cfs):0.62 1.16 1.40 1.87 BASIN 6A Basin Area (ac): 0.86 Storm Event Intensity Post-Dev C (weighted): 0.59 (yr) (in/hr)A B Overland Distance (ft): 60 2 0.93 0.36 0.6 Overland Slope (%): 1.0 5 1.43 0.52 0.64 Gutter Flow Distance (ft): 478.0 10 1.79 0.64 0.65 Gutter Flow Slope (%): 0.57 25 2.15 0.78 0.64 Post-Dev. Tc (min): 12.3 50 2.62 0.92 0.66 Post-Dev Tc (hr.): 0.20 100 2.92 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.59 0.59 0.59 0.59 Storm Intensity (in/hr): 0.93 1.79 2.15 2.92 Post-Dev Qp (cfs):0.47 0.91 1.09 1.48 BASIN 7A Basin Area (ac): 1.50 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 476 2 0.61 0.36 0.6 Overland Slope (%): 1.0 5 0.92 0.52 0.64 Gutter Flow Distance (ft): 238.0 10 1.14 0.64 0.65 Gutter Flow Slope (%): 0.59 25 1.37 0.78 0.64 Post-Dev. Tc (min): 24.8 50 1.65 0.92 0.66 Post-Dev Tc (hr.): 0.41 100 1.83 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.61 1.14 1.37 1.83 Post-Dev Qp (cfs):0.49 0.91 1.10 1.46 BASIN 8A Basin Area (ac): 3.06 Storm Event Intensity Post-Dev C (weighted): 0.47 (yr) (in/hr)A B Overland Distance (ft): 530 2 0.56 0.36 0.6 Overland Slope (%): 1.0 5 0.83 0.52 0.64 Gutter Flow Distance (ft): 382.0 10 1.02 0.64 0.65 Gutter Flow Slope (%): 1.15 25 1.24 0.78 0.64 Post-Dev. Tc (min): 29.1 50 1.48 0.92 0.66 Post-Dev Tc (hr.): 0.49 100 1.64 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.47 0.47 0.47 0.47 Storm Intensity (in/hr): 0.56 1.02 1.24 1.64 Post-Dev Qp (cfs):0.80 1.47 1.78 2.35 BASIN 9A Basin Area (ac): 2.13 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 298 2 0.69 0.36 0.6 Overland Slope (%): 1.0 5 1.04 0.52 0.64 Gutter Flow Distance (ft): 370.0 10 1.29 0.64 0.65 Gutter Flow Slope (%): 1.15 25 1.56 0.78 0.64 Post-Dev. Tc (min): 20.4 50 1.88 0.92 0.66 Post-Dev Tc (hr.): 0.34 100 2.08 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Storm Intensity (in/hr): 0.69 1.29 1.56 2.08 Post-Dev Qp (cfs):0.78 1.47 1.77 2.37 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 10A Basin Area (ac): 4.17 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 366 2 0.61 0.36 0.6 Overland Slope (%): 1.0 5 0.91 0.52 0.64 Gutter Flow Distance (ft): 609.0 10 1.13 0.64 0.65 Gutter Flow Slope (%): 0.90 25 1.36 0.78 0.64 Post-Dev. Tc (min): 25.1 50 1.64 0.92 0.66 Post-Dev Tc (hr.): 0.42 100 1.81 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.61 1.13 1.36 1.81 Post-Dev Qp (cfs):1.33 2.47 2.99 3.97 BASIN 11A Basin Area (ac): 2.25 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 285 2 0.71 0.36 0.6 Overland Slope (%): 1.0 5 1.08 0.52 0.64 Gutter Flow Distance (ft): 263.5 10 1.34 0.64 0.65 Gutter Flow Slope (%): 1.25 25 1.61 0.78 0.64 Post-Dev. Tc (min): 19.2 50 1.95 0.92 0.66 Post-Dev Tc (hr.): 0.32 100 2.16 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.71 1.34 1.61 2.16 Post-Dev Qp (cfs):0.85 1.60 1.93 2.58 BASIN 12A Basin Area (ac): 2.40 Storm Event Intensity Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 399 2 0.66 0.36 0.6 Overland Slope (%): 1.0 5 0.99 0.52 0.64 Gutter Flow Distance (ft): 167.0 10 1.23 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.49 0.78 0.64 Post-Dev. Tc (min): 21.9 50 1.79 0.92 0.66 Post-Dev Tc (hr.): 0.37 100 1.98 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.66 1.23 1.49 1.98 Post-Dev Qp (cfs):0.86 1.61 1.94 2.59 BASIN 13A Basin Area (ac): 0.35 Storm Event Intensity Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 14 2 1.18 0.36 0.6 Overland Slope (%): 1.0 5 1.84 0.52 0.64 Gutter Flow Distance (ft): 500.0 10 2.31 0.64 0.65 Gutter Flow Slope (%): 0.50 25 2.77 0.78 0.64 Post-Dev. Tc (min): 8.3 50 3.39 0.92 0.66 Post-Dev Tc (hr.): 0.14 100 3.80 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.18 2.31 2.77 3.80 Post-Dev Qp (cfs):0.30 0.59 0.70 0.97 BASIN 14A Basin Area (ac): 2.78 Storm Event Intensity Post-Dev C (weighted): 0.39 (yr) (in/hr)A B Overland Distance (ft): 412.5 2 0.51 0.36 0.6 Overland Slope (%): 1.0 5 0.76 0.52 0.64 Gutter Flow Distance (ft): 857.0 10 0.94 0.64 0.65 Gutter Flow Slope (%): 0.90 25 1.13 0.78 0.64 Post-Dev. Tc (min): 33.4 50 1.35 0.92 0.66 Post-Dev Tc (hr.): 0.56 100 1.50 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.39 0.39 0.39 0.39 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Storm Intensity (in/hr): 0.51 0.94 1.13 1.50 Post-Dev Qp (cfs):0.56 1.02 1.23 1.62 BASIN 15A Basin Area (ac): 0.06 Storm Event Intensity Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 15 2 2.23 0.36 0.6 Overland Slope (%): 1.0 5 3.64 0.52 0.64 Gutter Flow Distance (ft): 34.5 10 4.62 0.64 0.65 Gutter Flow Slope (%): 1.00 25 5.47 0.78 0.64 Post-Dev. Tc (min): 2.9 50 6.85 0.92 0.66 Post-Dev Tc (hr.): 0.05 100 7.76 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 2.23 4.62 5.47 7.76 Post-Dev Qp (cfs):0.09 0.19 0.22 0.32 BASIN 16A Basin Area (ac): 2.37 Storm Event Intensity Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 399 2 0.66 0.36 0.6 Overland Slope (%): 1.0 5 0.99 0.52 0.64 Gutter Flow Distance (ft): 159.5 10 1.23 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.49 0.78 0.64 Post-Dev. Tc (min): 21.8 50 1.79 0.92 0.66 Post-Dev Tc (hr.): 0.36 100 1.99 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.66 1.23 1.49 1.99 Post-Dev Qp (cfs):0.85 1.59 1.92 2.56 BASIN 17A Basin Area (ac): 3.01 Storm Event Intensity Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 400.5 2 0.64 0.36 0.6 Overland Slope (%): 1.0 5 0.97 0.52 0.64 Gutter Flow Distance (ft): 224.0 10 1.20 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.45 0.78 0.64 Post-Dev. Tc (min): 22.8 50 1.74 0.92 0.66 Post-Dev Tc (hr.): 0.38 100 1.93 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.64 1.20 1.45 1.93 Post-Dev Qp (cfs):1.05 1.95 2.35 3.14 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls 0.90 0.50 0.60 0.20 Note: Coefficients obtained from CoB Design Standards Table I-1 BASIN SDI-4B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 19730.889 0.45 0.73 0.33 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 31327.772 0.72 0.20 0.14 Totals 51058.7 1.17 0.47 Cw =0.40 BASIN SDI-5B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 21101.9 0.48 0.73 0.35 Dense Residential 57095.72 1.31 0.50 0.66 Commercial 0 0.00 0.60 0.00 Open Land 7449.88 0.17 0.20 0.03 Totals 85647.5 1.97 1.04 Cw =0.53 BASIN SDI-6B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 13202.151 0.30 0.73 0.22 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 43215.797 0.99 0.20 0.20 Totals 56417.9 1.30 0.42 Cw =0.32 Open Land URBAN + FARM PHASE 2 - BASIN B MAJOR SUBDIVISION Weighted Runoff Coefficients Asphalt/Concrete Dense Residential Commercial Neighborhood L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-7B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 8463.26 0.19 0.73 0.14 Dense Residential 49673.47 1.14 0.50 0.57 Commercial 0 0.00 0.60 0.00 Open Land 645.5 0.01 0.20 0.00 Totals 58782.2 1.35 0.71 Cw =0.53 BASIN SDI-8B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 8119.24 0.19 0.73 0.14 Dense Residential 82659 1.90 0.50 0.95 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 90778.2 2.08 1.08 Cw =0.52 BASIN SDI-9B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 18440.35 0.42 0.73 0.31 Dense Residential 50427.14 1.16 0.50 0.58 Commercial 0 0.00 0.60 0.00 Open Land 4659.94 0.11 0.20 0.02 Totals 73527.43 1.69 0.91 Cw =0.54 BASIN SDI-10B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 8525.88 0.20 0.73 0.14 Dense Residential 21723.98 0.50 0.50 0.25 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 30249.9 0.69 0.39 Cw =0.56 BASIN SDI-11B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 15119.93 0.35 0.73 0.25 Dense Residential 17502.7 0.40 0.50 0.20 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 32622.6 0.75 0.45 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Cw =0.61 BASIN SDI-12B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 13047.577 0.30 0.73 0.22 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 13047.6 0.30 0.22 Cw =0.73 BASIN SDI-13B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14142.952 0.32 0.73 0.24 Dense Residential 4958.76 0.11 0.50 0.06 Commercial 0 0.00 0.60 0.00 Open Land 28638.511 0.66 0.20 0.13 Totals 47740.2 1.10 0.43 Cw =0.39 BASIN SDI-14B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 5818.1 0.13 0.73 0.10 Dense Residential 26144.032 0.60 0.50 0.30 Commercial 26045.755 0.60 0.60 0.36 Open Land 0 0.00 0.20 0.00 Totals 58007.9 1.33 0.76 Cw =0.57 BASIN SDI-15B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 4689.36 0.11 0.73 0.08 Dense Residential 24162.95 0.55 0.50 0.28 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 28852.3 0.66 0.36 Cw =0.54 BASIN SDI-16B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 6170.27 0.14 0.73 0.10 Dense Residential 23132.04 0.53 0.50 0.27 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Totals 29302.3 0.67 0.37 Cw =0.55 BASIN SDI-17B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 5651.14 0.13 0.73 0.09 Dense Residential 551.25 0.01 0.50 0.01 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 6202.4 0.14 0.10 Cw =0.71 BASIN SDI-18B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 1645.83 0.04 0.73 0.03 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 1645.8 0.04 0.03 Cw =0.73 BASIN SDI-19B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 21007 0.48 0.73 0.35 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 21007.0 0.48 0.35 Cw =0.73 BASIN SDI-20B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 22468.84 0.52 0.73 0.38 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 22468.8 0.52 0.38 Cw =0.73 BASIN SDI-21B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 5821.34 0.13 0.73 0.10 Dense Residential 84105.66 1.93 0.50 0.97 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Totals 89927.0 2.06 1.06 Cw =0.51 BASIN SDI-22B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14154.89 0.32 0.73 0.24 Dense Residential 28637.7 0.66 0.50 0.33 Commercial 0 0.00 0.60 0.00 Open Land 2500.87 0.06 0.20 0.01 Totals 45293.5 1.04 0.58 Cw =0.56 BASIN SDI-23B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 18199.36 0.42 0.73 0.30 Dense Residential 44726.69 1.03 0.50 0.51 Commercial 0 0.00 0.60 0.00 Open Land 4109.71 0.09 0.20 0.02 Totals 67035.8 1.54 0.84 Cw =0.54 BASIN SDI-24B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 16909.71 0.39 0.73 0.28 Dense Residential 45663.25 1.05 0.50 0.52 Commercial 0 0.00 0.60 0.00 Open Land 5947.15 0.14 0.20 0.03 Totals 68520.1 1.57 0.83 Cw =0.53 BASIN SDI-25B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 36356.56 0.83 0.73 0.61 Dense Residential 54905.57 1.26 0.50 0.63 Commercial 0 0.00 0.60 0.00 Open Land 7161.3 0.16 0.20 0.03 Totals 98423.4 2.26 1.27 Cw =0.56 BASIN SDI-26B Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 6240.0 0.14 0.73 0.10 Dense Residential 81418.08 1.87 0.50 0.93 Commercial 0 0.00 0.60 0.00 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Open Land 0 0.00 0.20 0.00 Totals 87658.1 2.01 1.04 Cw =0.52 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Equations Used: Qp = C i A (Modified Rational Method) i = a * (DURATION) ^ -(b) (City of Bozeman) Overland Flow tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman) Gutter Flow V=3.28*k*(S^(1/2), where k=0.618 (paved) (FHWA HEC 22, Eqn 3-4) BASIN 4B Basin Area (ac): 1.17 Storm Event Intensity Post-Dev C (weighted): 0.40 (yr) (in/hr)A B Overland Distance (ft): 70 2 0.83 0.36 0.6 Overland Slope (%): 1.0 5 1.26 0.52 0.64 Gutter Flow Distance (ft): 391.0 10 1.57 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.89 0.78 0.64 Post-Dev. Tc (min): 15.0 50 2.30 0.92 0.66 Post-Dev. Tc (hr.): 0.25 100 2.56 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.40 0.40 0.40 0.40 Storm Intensity (in/hr): 0.83 1.57 1.89 2.56 Post-Dev Qp (cfs):0.39 0.75 0.90 1.21 BASIN 5B Basin Area (ac): 1.97 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 391.5 2 0.65 0.36 0.6 Overland Slope (%): 1.0 5 0.98 0.52 0.64 Gutter Flow Distance (ft): 171.0 10 1.22 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.47 0.78 0.64 Post-Dev. Tc (min): 22.3 50 1.77 0.92 0.66 Post-Dev. Tc (hr.): 0.37 100 1.96 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.65 1.22 1.47 1.96 Post-Dev Qp (cfs):0.68 1.27 1.53 2.05 BASIN 6B Basin Area (ac): 1.30 Storm Event Intensity Post-Dev C (weighted): 0.32 (yr) (in/hr)A B Overland Distance (ft): 225 2 0.63 0.36 0.6 Overland Slope (%): 1.0 5 0.94 0.52 0.64 Gutter Flow Distance (ft): 243.0 10 1.17 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.41 0.78 0.64 Post-Dev. Tc (min): 23.8 50 1.69 0.92 0.66 Post-Dev. Tc (hr.): 0.40 100 1.88 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.32 0.32 0.32 0.32 Storm Intensity (in/hr): 0.63 1.17 1.41 1.88 Post-Dev Qp (cfs):0.26 0.49 0.59 0.79 URBAN + FARM PHASE 2 - BASIN B MAJOR SUBDIVISION POST-DEVELOPMENT SUB BASIN FLOWS Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 7B Basin Area (ac): 1.35 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 503 2 0.61 0.36 0.6 Overland Slope (%): 1.0 5 0.91 0.52 0.64 Gutter Flow Distance (ft): 197.0 10 1.13 0.64 0.65 Gutter Flow Slope (%): 0.7 25 1.37 0.78 0.64 Post-Dev. Tc (min): 25.0 50 1.64 0.92 0.66 Post-Dev. Tc (hr.): 0.42 100 1.82 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.61 1.13 1.37 1.82 Post-Dev Qp (cfs):0.44 0.81 0.98 1.30 BASIN 8B Basin Area (ac): 2.08 Storm Event Intensity Post-Dev C (weighted): 0.52 (yr) (in/hr)A B Overland Distance (ft): 406 2 0.64 0.36 0.6 Overland Slope (%): 1.0 5 0.97 0.52 0.64 Gutter Flow Distance (ft): 176.0 10 1.20 0.64 0.65 Gutter Flow Slope (%): 0.64 25 1.45 0.78 0.64 Post-Dev. Tc (min): 22.8 50 1.74 0.92 0.66 Post-Dev. Tc (hr.): 0.38 100 1.93 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.52 0.52 0.52 0.52 Storm Intensity (in/hr): 0.64 1.20 1.45 1.93 Post-Dev Qp (cfs):0.70 1.30 1.57 2.09 BASIN 9B Basin Area (ac): 1.69 Storm Event Intensity Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 23 2 0.96 0.36 0.6 Overland Slope (%): 1.0 5 1.49 0.52 0.64 Gutter Flow Distance (ft): 610.0 10 1.86 0.64 0.65 Gutter Flow Slope (%): 0.6 25 2.23 0.78 0.64 Post-Dev. Tc (min): 11.6 50 2.72 0.92 0.66 Post-Dev. Tc (hr.): 0.19 100 3.04 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.96 1.86 2.23 3.04 Post-Dev Qp (cfs):0.88 1.69 2.03 2.76 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 10B Basin Area (ac): 0.69 Storm Event Intensity Post-Dev C (weighted): 0.56 (yr) (in/hr)A B Overland Distance (ft): 165 2 0.89 0.36 0.6 Overland Slope (%): 1.0 5 1.37 0.52 0.64 Gutter Flow Distance (ft): 129.5 10 1.71 0.64 0.65 Gutter Flow Slope (%): 1.8 25 2.06 0.78 0.64 Post-Dev. Tc (min): 13.2 50 2.50 0.92 0.66 Post-Dev. Tc (hr.): 0.22 100 2.79 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.56 0.56 0.56 0.56 Storm Intensity (in/hr): 0.89 1.71 2.06 2.79 Post-Dev Qp (cfs):0.35 0.67 0.81 1.09 BASIN 11B Basin Area (ac): 0.75 Storm Event Intensity Post-Dev C (weighted): 0.61 (yr) (in/hr)A B Overland Distance (ft): 46 2 1.16 0.36 0.6 Overland Slope (%): 1.0 5 1.81 0.52 0.64 Gutter Flow Distance (ft): 335.0 10 2.27 0.64 0.65 Gutter Flow Slope (%): 1.2 25 2.72 0.78 0.64 Post-Dev. Tc (min): 8.5 50 3.33 0.92 0.66 Post-Dev. Tc (hr.): 0.14 100 3.73 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.61 0.61 0.61 0.61 Storm Intensity (in/hr): 1.16 2.27 2.72 3.73 Post-Dev Qp (cfs):0.53 1.03 1.23 1.69 BASIN 12B Basin Area (ac): 0.30 Storm Event Intensity Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 13.5 2 1.36 0.36 0.6 Overland Slope (%): 1.0 5 2.15 0.52 0.64 Gutter Flow Distance (ft): 430.0 10 2.71 0.64 0.65 Gutter Flow Slope (%): 0.75 25 3.23 0.78 0.64 Post-Dev. Tc (min): 6.5 50 3.98 0.92 0.66 Post-Dev. Tc (hr.): 0.11 100 4.46 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.36 2.71 3.23 4.46 Post-Dev Qp (cfs):0.30 0.59 0.71 0.98 BASIN 13B Basin Area (ac): 1.10 Storm Event Intensity Post-Dev C (weighted): 0.39 (yr) (in/hr)A B Overland Distance (ft): 79 2 0.83 0.36 0.6 Overland Slope (%): 1.0 5 1.27 0.52 0.64 Gutter Flow Distance (ft): 370.0 10 1.58 0.64 0.65 Gutter Flow Slope (%): 0.75 25 1.90 0.78 0.64 Post-Dev. Tc (min): 14.9 50 2.31 0.92 0.66 Post-Dev. Tc (hr.): 0.25 100 2.57 1.01 0.67 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.39 0.39 0.39 0.39 Storm Intensity (in/hr): 0.83 1.58 1.90 2.57 Post-Dev Qp (cfs):0.35 0.67 0.81 1.09 BASIN 14B Basin Area (ac): 1.33 Storm Event Intensity Post-Dev C (weighted): 0.57 (yr) (in/hr)A B Overland Distance (ft): 293.5 2 0.74 0.36 0.6 Overland Slope (%): 1.0 5 1.12 0.52 0.64 Gutter Flow Distance (ft): 142.0 10 1.40 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.68 0.78 0.64 Post-Dev. Tc (min): 18.1 50 2.03 0.92 0.66 Post-Dev. Tc (hr.): 0.30 100 2.26 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.57 0.57 0.57 0.57 Storm Intensity (in/hr): 0.74 1.40 1.68 2.26 Post-Dev Qp (cfs):0.56 1.06 1.27 1.71 BASIN 15B Basin Area (ac): 0.66 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 168 2 0.83 0.36 0.6 Overland Slope (%): 1.0 5 1.27 0.52 0.64 Gutter Flow Distance (ft): 143.0 10 1.59 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.91 0.78 0.64 Post-Dev. Tc (min): 14.8 50 2.32 0.92 0.66 Post-Dev. Tc (hr.): 0.25 100 2.58 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.83 1.59 1.91 2.58 Post-Dev Qp (cfs):0.30 0.57 0.68 0.92 BASIN 16B Basin Area (ac): 0.67 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.55 (yr) (in/hr)A B Overland Distance (ft): 171.5 2 0.88 0.36 0.6 Overland Slope (%): 1.0 5 1.35 0.52 0.64 Gutter Flow Distance (ft): 115.0 10 1.68 0.64 0.65 Gutter Flow Slope (%): 2.6 25 2.02 0.78 0.64 Post-Dev. Tc (min): 13.6 50 2.45 0.92 0.66 Post-Dev. Tc (hr.): 0.23 100 2.73 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.55 0.55 0.55 0.55 Storm Intensity (in/hr): 0.88 1.68 2.02 2.73 Post-Dev Qp (cfs):0.32 0.62 0.74 1.01 BASIN 17B Basin Area (ac): 0.14 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.71 (yr) (in/hr)A B Overland Distance (ft): 37 2 1.61 0.36 0.6 Overland Slope (%): 1.0 5 2.57 0.52 0.64 Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Gutter Flow Distance (ft): 133 10 3.24 0.64 0.65 Gutter Flow Slope (%): 2.6 25 3.85 0.78 0.64 Post-Dev. Tc (min): 5.0 50 4.77 0.92 0.66 Post-Dev. Tc (hr.): 0.08 100 5.37 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.71 0.71 0.71 0.71 Storm Intensity (in/hr): 1.61 3.24 3.85 5.37 Post-Dev Qp (cfs):0.16 0.33 0.39 0.54 BASIN 18B Basin Area (ac): 0.04 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 18 2 2.20 0.36 0.6 Overland Slope (%): 1.0 5 3.58 0.52 0.64 Gutter Flow Distance (ft): 20 10 4.54 0.64 0.65 Gutter Flow Slope (%): 2.0 25 5.37 0.78 0.64 Post-Dev. Tc (min): 2.9 50 6.73 0.92 0.66 Post-Dev. Tc (hr.): 0.05 100 7.62 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 2.20 4.54 5.37 7.62 Post-Dev Qp (cfs):0.06 0.13 0.15 0.21 BASIN 19B Basin Area (ac): 0.48 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 43.5 2 1.31 0.36 0.6 Overland Slope (%): 1.0 5 2.05 0.52 0.64 Gutter Flow Distance (ft): 434 10 2.58 0.64 0.65 Gutter Flow Slope (%): 1.9 25 3.08 0.78 0.64 Post-Dev. Tc (min): 7.0 50 3.79 0.92 0.66 Post-Dev. Tc (hr.): 0.12 100 4.26 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.31 2.58 3.08 4.26 Post-Dev Qp (cfs):0.46 0.91 1.08 1.50 BASIN 20B Basin Area (ac): 0.52 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 75 2 1.17 0.36 0.6 Overland Slope (%): 1.0 5 1.83 0.52 0.64 Gutter Flow Distance (ft): 430 10 2.30 0.64 0.65 Gutter Flow Slope (%): 1.9 25 2.75 0.78 0.64 Post-Dev. Tc (min): 8.4 50 3.38 0.92 0.66 Post-Dev. Tc (hr.): 0.14 100 3.78 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.17 2.30 2.75 3.78 Post-Dev Qp (cfs):0.44 0.87 1.04 1.42 BASIN 21B L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Basin Area (ac): 2.06 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.51 (yr) (in/hr)A B Overland Distance (ft): 406 2 0.64 0.36 0.6 Overland Slope (%): 1.0 5 0.96 0.52 0.64 Gutter Flow Distance (ft): 180 10 1.19 0.64 0.65 Gutter Flow Slope (%): 0.64 25 1.44 0.78 0.64 Post-Dev. Tc (min): 23.1 50 1.73 0.92 0.66 Post-Dev. Tc (hr.): 0.38 100 1.92 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.51 0.51 0.51 0.51 Storm Intensity (in/hr): 0.64 1.19 1.44 1.92 Post-Dev Qp (cfs):0.68 1.27 1.53 2.04 BASIN 22B Basin Area (ac): 1.04 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.56 (yr) (in/hr)A B Overland Distance (ft): 391.5 2 0.70 0.36 0.6 Overland Slope (%): 1.0 5 1.05 0.52 0.64 Gutter Flow Distance (ft): 46.5 10 1.31 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.58 0.78 0.64 Post-Dev. Tc (min): 19.9 50 1.90 0.92 0.66 Post-Dev. Tc (hr.): 0.33 100 2.11 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.56 0.56 0.56 0.56 Storm Intensity (in/hr): 0.70 1.31 1.58 2.11 Post-Dev Qp (cfs):0.40 0.76 0.91 1.22 BASIN 23B Basin Area (ac): 1.54 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.54 (yr) (in/hr)A B Overland Distance (ft): 391.5 2 0.67 0.36 0.6 Overland Slope (%): 1.0 5 1.01 0.52 0.64 Gutter Flow Distance (ft): 113.0 10 1.26 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.52 0.78 0.64 Post-Dev. Tc (min): 21.1 50 1.83 0.92 0.66 Post-Dev. Tc (hr.): 0.35 100 2.03 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.54 0.54 0.54 0.54 Storm Intensity (in/hr): 0.67 1.26 1.52 2.03 Post-Dev Qp (cfs):0.56 1.06 1.27 1.70 BASIN 24B Basin Area (ac): 1.57 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 390.5 2 0.66 0.36 0.6 Overland Slope (%): 1.0 5 1.00 0.52 0.64 Gutter Flow Distance (ft): 129.0 10 1.24 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.49 0.78 0.64 Post-Dev. Tc (min): 21.7 50 1.80 0.92 0.66 Post-Dev. Tc (hr.): 0.36 100 1.99 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.66 1.24 1.49 1.99 Post-Dev Qp (cfs):0.55 1.03 1.25 1.66 BASIN 25B Basin Area (ac): 2.26 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.56 (yr) (in/hr)A B Overland Distance (ft): 103 2 0.88 0.36 0.6 Overland Slope (%): 1.0 5 1.34 0.52 0.64 Gutter Flow Distance (ft): 521.0 10 1.68 0.64 0.65 Gutter Flow Slope (%): 1.25 25 2.01 0.78 0.64 Post-Dev. Tc (min): 13.6 50 2.45 0.92 0.66 Post-Dev. Tc (hr.): 0.23 100 2.73 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.56 0.56 0.56 0.56 Storm Intensity (in/hr): 0.88 1.68 2.01 2.73 Post-Dev Qp (cfs):1.11 2.13 2.56 3.47 BASIN 26B Basin Area (ac): 2.01 Storm Event Intensity Storm Coeff. (i) Post-Dev C (weighted): 0.52 (yr) (in/hr)A B Overland Distance (ft): 406 2 0.64 0.36 0.6 Overland Slope (%): 1.0 5 0.96 0.52 0.64 Gutter Flow Distance (ft): 172.5 10 1.20 0.64 0.65 Gutter Flow Slope (%): 0.64 25 1.44 0.78 0.64 Post-Dev. Tc (min): 22.9 50 1.74 0.92 0.66 Post-Dev. Tc (hr.): 0.38 100 1.92 1.01 0.67 Storm Event (yr):2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.52 0.52 0.52 0.52 Storm Intensity (in/hr): 0.64 1.20 1.44 1.92 Post-Dev Qp (cfs):0.67 1.24 1.50 2.00 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls 0.90 0.50 0.60 0.20 Note: Coefficients obtained from CoB Design Standards Table I-1 BASIN SDI-1C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 33525.86 0.77 0.73 0.56 Dense Residential 0 0.00 0.50 0.00 Commercial 40327.13 0.93 0.60 0.56 Open Land 5974.31 0.14 0.20 0.03 Totals 79827.3 1.83 1.14 Cw =0.62 BASIN SDI-2C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 11049.91 0.25 0.73 0.19 Dense Residential 89958.25 2.07 0.50 1.03 Commercial 40000.459 0.92 0.60 0.55 Open Land 17785.88 0.41 0.20 0.08 Totals 158794.5 3.65 1.85 Cw =0.51 BASIN SDI-3C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 2020.37 0.05 0.73 0.03 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 2020.4 0.05 0.03 Cw =0.73 URBAN + FARM PHASE 2 - BASIN C MAJOR SUBDIVISION Weighted Runoff Coefficients Asphalt/Concrete Dense Residential Commercial Neighborhood Open Land L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-5C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 27813.14 0.64 0.73 0.47 Dense Residential 34864.257 0.80 0.50 0.40 Commercial 0 0.00 0.60 0.00 Open Land 26444.112 0.61 0.20 0.12 Totals 89121.5 2.05 0.99 Cw =0.48 BASIN SDI-6C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 9596.53 0.22 0.73 0.16 Dense Residential 0 0.00 0.50 0.00 Commercial 36275.03 0.83 0.60 0.50 Open Land 29766.58 0.68 0.20 0.14 Totals 75638.14 1.74 0.80 Cw =0.46 BASIN SDI-7C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 16256.27 0.37 0.73 0.27 Dense Residential 107565.7 2.47 0.50 1.23 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 123822.0 2.84 1.51 Cw =0.53 BASIN SDI-8C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14223.06 0.33 0.73 0.24 Dense Residential 45236.86 1.04 0.50 0.52 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 59459.9 1.37 0.76 Cw =0.56 BASIN SDI-9C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 5655.42 0.13 0.73 0.09 Dense Residential 2180.63 0.05 0.50 0.03 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 7836.1 0.18 0.12 Cw =0.67 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-10C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 8620.47 0.20 0.73 0.14 Dense Residential 10021.07 0.23 0.50 0.12 Commercial 60673.38 1.39 0.60 0.84 Open Land 28720.51 0.66 0.20 0.13 Totals 108035.4 2.48 1.23 Cw =0.49 BASIN SDI-11C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 46042.93 1.06 0.73 0.77 Dense Residential 107213.41 2.46 0.50 1.23 Commercial 0 0.00 0.60 0.00 Open Land 24547.86 0.56 0.20 0.11 Totals 177804.2 4.08 2.11 Cw =0.52 BASIN SDI-12C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 14477.61 0.33 0.73 0.24 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 0 0.00 0.20 0.00 Totals 14477.6 0.33 0.24 Cw =0.73 BASIN SDI-13C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 18245.98 0.42 0.73 0.31 Dense Residential 0 0.00 0.50 0.00 Commercial 28704.23 0.66 0.60 0.40 Open Land 4038.67 0.09 0.20 0.02 Totals 50988.9 1.17 0.72 Cw =0.61 BASIN SDI-14C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 8246 0.19 0.73 0.14 Dense Residential 0 0.00 0.50 0.00 Commercial 20140 0.46 0.60 0.28 Open Land 5422 0.12 0.20 0.02 Totals 33808.0 0.78 0.44 Cw =0.57 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN SDI-15C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 7922 0.18 0.73 0.13 Dense Residential 0 0.00 0.50 0.00 Commercial 0 0.00 0.60 0.00 Open Land 42927 0.99 0.20 0.20 Totals 50849.0 1.17 0.33 Cw =0.28 BASIN SDI-16C Post-Development Weighted C-Value (Cw) Area Area Runoff (sqft) (Acres) Coefficient Calculations R.O.W. 9731 0.22 0.73 0.16 Dense Residential 0 0.00 0.50 0.00 Commercial 15378 0.35 0.60 0.21 Open Land 24144 0.55 0.20 0.11 Totals 49253.0 1.13 0.49 Cw =0.43 L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Equations Used: Qp = C i A (Modified Rational Method) i = a * (DURATION) ^ -(b) (City of Bozeman) Overland Flow tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman) Gutter Flow V=3.28*k*(S^(1/2), where k=0.618 (paved) (FHWA HEC 22, Eqn 3-4) BASIN 1C Basin Area (ac): 1.83 Storm Event Intensity Post-Dev C (weighted): 0.62 (yr) (in/hr)A B Overland Distance (ft): 397 2 0.73 0.36 0.6 Overland Slope (%): 1.0 5 1.10 0.52 0.64 Gutter Flow Distance (ft): 127.0 10 1.37 0.64 0.65 Gutter Flow Slope (%): 0.5 25 1.65 0.78 0.64 Post-Dev. Tc (min): 18.5 50 2.00 0.92 0.66 Post-Dev. Tc (hr.): 0.31 100 2.22 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.62 0.62 0.62 0.62 Storm Intensity (in/hr): 0.73 1.37 1.65 2.22 Post-Dev Qp (cfs):0.83 1.57 1.89 2.54 BASIN 2C Basin Area (ac): 3.65 Storm Event Intensity Post-Dev C (weighted): 0.51 (yr) (in/hr)A B Overland Distance (ft): 205 2 0.74 0.36 0.6 Overland Slope (%): 1.0 5 1.12 0.52 0.64 Gutter Flow Distance (ft): 249.0 10 1.39 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.68 0.78 0.64 Post-Dev. Tc (min): 18.2 50 2.02 0.92 0.66 Post-Dev. Tc (hr.): 0.30 100 2.25 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.51 0.51 0.51 0.51 Storm Intensity (in/hr): 0.74 1.39 1.68 2.25 Post-Dev Qp (cfs):1.36 2.57 3.10 4.16 BASIN 3C Basin Area (ac): 0.05 Storm Event Intensity Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 31 2 1.88 0.36 0.6 Overland Slope (%): 1.0 5 3.03 0.52 0.64 Gutter Flow Distance (ft): 17.5 10 3.83 0.64 0.65 Gutter Flow Slope (%): 1.60 25 4.54 0.78 0.64 Post-Dev. Tc (min): 3.8 50 5.66 0.92 0.66 Post-Dev. Tc (hr.): 0.06 100 6.39 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.88 3.83 4.54 6.39 Post-Dev Qp (cfs):0.06 0.13 0.15 0.22 BASIN 5C Basin Area (ac): 2.05 Storm Event Intensity Post-Dev C (weighted): 0.48 (yr) (in/hr)A B Overland Distance (ft): 504 2 0.57 0.36 0.6 Overland Slope (%): 1.0 5 0.85 0.52 0.64 Gutter Flow Distance (ft): 234.0 10 1.06 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.28 0.78 0.64 Post-Dev. Tc (min): 27.7 50 1.53 0.92 0.66 Post-Dev. Tc (hr.): 0.46 100 1.70 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.48 0.48 0.48 0.48 Storm Intensity (in/hr): 0.57 1.06 1.28 1.70 Post-Dev Qp (cfs):0.57 1.05 1.26 1.68 BASIN 6C Basin Area (ac): 1.74 Storm Event Intensity Post-Dev C (weighted): 0.46 (yr) (in/hr)A B Overland Distance (ft): 278 2 0.66 0.36 0.6 URBAN + FARM PHASE 2 - BASIN C MAJOR SUBDIVISION POST-DEVELOPMENT SUB BASIN FLOWS Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls Overland Slope (%): 1.0 5 1.00 0.52 0.64 Gutter Flow Distance (ft): 217.0 10 1.24 0.64 0.65 Gutter Flow Slope (%): 0.55 25 1.50 0.78 0.64 Post-Dev. Tc (min): 21.6 50 1.80 0.92 0.66 Post-Dev. Tc (hr.): 0.36 100 2.00 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.46 0.46 0.46 0.46 Storm Intensity (in/hr): 0.66 1.24 1.50 2.00 Post-Dev Qp (cfs):0.53 0.99 1.19 1.59 BASIN 7C Basin Area (ac): 2.84 Storm Event Intensity Post-Dev C (weighted): 0.53 (yr) (in/hr)A B Overland Distance (ft): 458 2 0.63 0.36 0.6 Overland Slope (%): 1.0 5 0.95 0.52 0.64 Gutter Flow Distance (ft): 127.5 10 1.18 0.64 0.65 Gutter Flow Slope (%): 0.55 25 1.43 0.78 0.64 Post-Dev. Tc (min): 23.4 50 1.71 0.92 0.66 Post-Dev. Tc (hr.): 0.39 100 1.90 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.53 0.53 0.53 0.53 Storm Intensity (in/hr): 0.63 1.18 1.43 1.90 Post-Dev Qp (cfs):0.96 1.78 2.15 2.86 BASIN 8C Basin Area (ac): 1.37 Storm Event Intensity Post-Dev C (weighted): 0.56 (yr) (in/hr)A B Overland Distance (ft): 176.5 2 0.79 0.36 0.6 Overland Slope (%): 1.0 5 1.20 0.52 0.64 Gutter Flow Distance (ft): 415.0 10 1.50 0.64 0.65 Gutter Flow Slope (%): 1.12 25 1.80 0.78 0.64 Post-Dev. Tc (min): 16.3 50 2.18 0.92 0.66 Post-Dev. Tc (hr.): 0.27 100 2.42 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.56 0.56 0.56 0.56 Storm Intensity (in/hr): 0.79 1.50 1.80 2.42 Post-Dev Qp (cfs):0.60 1.13 1.36 1.84 Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 9C Basin Area (ac): 0.18 Storm Event Intensity Post-Dev C (weighted): 0.67 (yr) (in/hr)A B Overland Distance (ft): 18 2 1.73 0.36 0.6 Overland Slope (%): 1.0 5 2.77 0.52 0.64 Gutter Flow Distance (ft): 171.0 10 3.50 0.64 0.65 Gutter Flow Slope (%): 1.72 25 4.16 0.78 0.64 Post-Dev. Tc (min): 4.4 50 5.17 0.92 0.66 Post-Dev. Tc (hr.): 0.07 100 5.83 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.67 0.67 0.67 0.67 Storm Intensity (in/hr): 1.73 3.50 4.16 5.83 Post-Dev Qp (cfs):0.21 0.42 0.50 0.70 BASIN 10C Basin Area (ac): 2.48 Storm Event Intensity Post-Dev C (weighted): 0.49 (yr) (in/hr)A B Overland Distance (ft): 379 2 0.65 0.36 0.6 Overland Slope (%): 1.0 5 0.97 0.52 0.64 Gutter Flow Distance (ft): 127.5 10 1.21 0.64 0.65 Gutter Flow Slope (%): 0.55 25 1.46 0.78 0.64 Post-Dev. Tc (min): 22.6 50 1.75 0.92 0.66 Post-Dev. Tc (hr.): 0.38 100 1.94 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.49 0.49 0.49 0.49 Storm Intensity (in/hr): 0.65 1.21 1.46 1.94 Post-Dev Qp (cfs):0.79 1.48 1.79 2.38 BASIN 11C Basin Area (ac): 4.08 Storm Event Intensity Post-Dev C (weighted): 0.52 (yr) (in/hr)A B Overland Distance (ft): 367 2 0.69 0.36 0.6 Overland Slope (%): 1.0 5 1.03 0.52 0.64 Gutter Flow Distance (ft): 72.0 10 1.29 0.64 0.65 Gutter Flow Slope (%): 1.72 25 1.55 0.78 0.64 Post-Dev. Tc (min): 20.5 50 1.87 0.92 0.66 Post-Dev. Tc (hr.): 0.34 100 2.07 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.52 0.52 0.52 0.52 Storm Intensity (in/hr): 0.69 1.29 1.55 2.07 Post-Dev Qp (cfs):1.45 2.72 3.28 4.38 BASIN 12C Basin Area (ac): 0.33 Storm Event Intensity Post-Dev C (weighted): 0.73 (yr) (in/hr)A B Overland Distance (ft): 71.5 2 1.25 0.36 0.6 Overland Slope (%): 1.0 5 1.97 0.52 0.64 Gutter Flow Distance (ft): 297.0 10 2.47 0.64 0.65 Gutter Flow Slope (%): 1.72 25 2.95 0.78 0.64 Post-Dev. Tc (min): 7.5 50 3.63 0.92 0.66 Post-Dev. Tc (hr.): 0.12 100 4.07 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.73 0.73 0.73 0.73 Storm Intensity (in/hr): 1.25 2.47 2.95 4.07 Post-Dev Qp (cfs):0.30 0.60 0.72 0.99 BASIN 13C Basin Area (ac): 1.17 Storm Event Intensity Post-Dev C (weighted): 0.61 (yr) (in/hr)A B Overland Distance (ft): 398 2 0.73 0.36 0.6 Overland Slope (%): 1.0 5 1.11 0.52 0.64 Gutter Flow Distance (ft): 74.0 10 1.39 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.67 0.78 0.64 Post-Dev. Tc (min): 18.3 50 2.02 0.92 0.66 Post-Dev. Tc (hr.): 0.30 100 2.24 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.61 0.61 0.61 0.61 Storm Intensity (in/hr): 0.73 1.39 1.67 2.24 Post-Dev Qp (cfs):0.53 1.00 1.20 1.61 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls BASIN 14C Basin Area (ac): 0.78 Storm Event Intensity Post-Dev C (weighted): 0.57 (yr) (in/hr)A B Overland Distance (ft): 311 2 0.77 0.36 0.6 Overland Slope (%): 1.0 5 1.16 0.52 0.64 Gutter Flow Distance (ft): 15.0 10 1.45 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.74 0.78 0.64 Post-Dev. Tc (min): 17.1 50 2.11 0.92 0.66 Post-Dev. Tc (hr.): 0.28 100 2.34 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.57 0.57 0.57 0.57 Storm Intensity (in/hr): 0.77 1.45 1.74 2.34 Post-Dev Qp (cfs):0.34 0.64 0.77 1.03 BASIN 15C Basin Area (ac): 1.17 Storm Event Intensity Post-Dev C (weighted): 0.28 (yr) (in/hr)A B Overland Distance (ft): 325 2 0.59 0.36 0.6 Overland Slope (%): 1.0 5 0.87 0.52 0.64 Gutter Flow Distance (ft): 15.0 10 1.08 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.31 0.78 0.64 Post-Dev. Tc (min): 26.7 50 1.57 0.92 0.66 Post-Dev. Tc (hr.): 0.44 100 1.74 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.28 0.28 0.28 0.28 Storm Intensity (in/hr): 0.59 1.08 1.31 1.74 Post-Dev Qp (cfs):0.19 0.36 0.43 0.57 BASIN 16C Basin Area (ac): 1.13 Storm Event Intensity Post-Dev C (weighted): 0.43 (yr) (in/hr)A B Overland Distance (ft): 390 2 0.62 0.36 0.6 Overland Slope (%): 1.0 5 0.93 0.52 0.64 Gutter Flow Distance (ft): 15.0 10 1.16 0.64 0.65 Gutter Flow Slope (%): 0.50 25 1.40 0.78 0.64 Post-Dev. Tc (min): 24.0 50 1.68 0.92 0.66 Post-Dev. Tc (hr.): 0.40 100 1.87 1.01 0.67 Storm Event (yr): 2 10 25 100 Storm Coeff. A: 0.36 0.64 0.78 1.01 Storm Coeff. B:0.60 0.65 0.64 0.67 Composite C: 0.43 0.43 0.43 0.43 Storm Intensity (in/hr): 0.62 1.16 1.40 1.87 Post-Dev Qp (cfs):0.30 0.56 0.68 0.91 Storm Coeff. (i) Storm Coeff. (i) Storm Coeff. (i) L:\203430\Computations\PHASE 2\Stormwater\Stormwater Calculations Inlet Calcs.xls