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SW6220805_Design Calculations (Time of Concentration)_20221019
[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" Storm Event Rainfall Intensity 5-min 10-min 15-min 30-min 10-yr 7.88 6.31 5.32 3.85 25-yr 8.80 7.01 5.92 4.38 50-yr 9.48 7.55 6.37 4.80 100-yr 10.101 8.051 6.781 5.19 Ditch No. Drainage Impervious Grassed C Area (ac) I Area (ac) I Area (ac) 1 0.27 0.06 0.21 0.45 2 1.76 0.41 1.35 0.45 3 2.47 0.19 2.28 0.35 4 0.21 0.05 0.16 0.45 5 0.22 0.05 0.17 0.45 6 1.58 0.24 1.34 0.40 7 1.24 0.19 1.05 0.40 8 0.21 0.05 0.16 0.45 Kerby L (ft) n s T- n/a n/a n/a n/a n/a n/a n/a n/a Tc L (ft) 335.0 650.0 950.0 290.0 295.0 700.0 565.0 240.0 Kirpich S 0.010 0.010 0.008 0.005 0.005 0.005 0.005 0.010 C. Channel slope < 5.0% for curb outlet swales Rainfall Stonn Intensity Q (cfs) Total Tc Tc Used Event (yr)(in/hr) Tin 4.04 4.04 5 10-yr 7.88 0.96 6.73 6.73 5 10-yr 7.88 6.24 9.82 9.82 10 10-yr 6.31 5.45 4.72 4.72 5 10-yr 7.88 0.74 4.78 4.78 5 10-yr 7.88 0.78 9.31 9.31 10 10-yr 6.31 3.99 7.89 7.89 10 10-yr 6.31 3.13 3.13 3.13 5 10-yr 7.88 0.74 printed: 10/19/2022 425 PM Page 1 of 1