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HomeMy WebLinkAboutSW6220904_Design Calculations_20221102[CALCULATIONS sheet only set up to handle Tc from 5 min to 30 min A. Flow velocity < 2.0 fps when discharging to wetlands B. Flow velocity < 4.5 fps all other cases" C. Channel slope < 5.0% for curb outlet swales Storm Event Rainfall Intensity 5-min 10-min 15-min 30-min 10-yr 7.98 6.38 5.38 3.90 25-yr 8.90 7.10 6.00 4.44 50-yr 9.58 7.62 6.43 4.84 100-yr 10.201 8.11 6.831 5.23 Drainage Impervious Grassed Tc Stonn Rainfall Ditch No. C Kerby Kirpich Intensity Q (cfs) Area (ac) Area (ac) Area (ac) Event (yr) Total Tc Tc Used (in/hr) L (ft) n s Tom L (ft) S Tab 1 22.27 1.71 20.56 0.35 n/a 2000.0 0.010 15.99 15.99 15 10-yr 5.38 41.93 2 23.18 1.78 21.40 0.35 n/a 2200.0 0.015 14.72 14.72 15 10-yr 5.38 43.65 3 1.13 0.35 0.78 0.50 n/a 700.0 0.030 4.67 4.67 5 10-yr 7.98 4.51 4 1.37 0.42 0.95 0.50 n/a 515.0 0.030 3.69 3.69 5 10-yr 7.98 5.47 5 5.80 0.45 5.35 0.35 n/a 1650.0 0.010 13.79 13.79 15 10-yr 5.38 10.92 6 8.94 2.06 6.88 0.45 n/a 2100.0 0.015 14.20 14.20 15 10-yr 5.38 21.64 7 5.23 0.40 4.83 0.35 n/a 1600.0 0.010 13.47 13.47 15 10-yr 5.38 9.85 8 2.57 0.20 2.37 0.35 n/a 1350.0 0.010 11.82 11.82 10 10-yr 6.38 5.74 9 8.78 0.68 8.10 0.35 n/a 1500.0 0.010 12.81 12.81 15 10-yr 5.38 16.53 10 10.74 0.00 10.74 0.30 n/a 2100.0 0.020 12.71 12.71 15 10-yr 5.38 17.33 11 2.03 0.94 1.09 0.60 n/a 815.0 0.040 4.70 4.70 5 10-yr 7.98 9.72 12 1.44 0.66 0.78 0.60 n/a 560.0 0.050 3.23 3.23 5 10-yr 7.98 6.89 13 1.14 0.53 0.61 0.60 n/a 600.0 0.050 3.41 3.41 5 10-yr 7.98 5.46 printed: 11/2120226:40AM Page 1 of 1