Swale 2 Sizing <br />Open Channel Flow Calculation Results <br />Notes: <br />-Q based on runoff on previous page <br />-Depth is 4" or less <br />-Velocity is used to calculate residence time below <br />Residence Time Calculations <br />V = 0.23 ft/s <br />Length = 143 ft <br />Time = (L/V)/60 = 10.36 minutes