5.4.5 Using the cumulative rainfall hyetograph given below for a 150-km² watershed, determine the abstractions and the excess rainfall hyetograph using Horton's equation with fo = 40 mm/h, fe = 10 mm/h, and k 2 h. Assume that an interception storage of 10 mm is satisfied before infiltration begins. Also, determine the depth and volume of excess rainfall and its duration. = Time (h) 1 2 3 5 6 Cumulative rainfall (mm) 25 70 115 140 160 180 5.4.6 Solve Prob. 5.4.5 if the soil is described by Philip's equation with S = 50 mm-h-1/2 and K 20 mm/h. = 0.47 0.297 0.164