5.4.4 5.4.5 Solve Example 5.4.1 in the text if the soil is described by Horton's equation with fo 5 cm/h, fc = 1 cm/h, and k = 2 h. Using the cumulative rainfall hyetograph given below for a 150-km watershed, determine the abstractions and the excess rainfall hyetograph using Horton's equation with fo = 40 mm/h, fc = 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 4 5 6 Cumulative rainfall (mm) 25 70 115 140 160 180