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 an interception storage of 10 mm is satisfied before infiltration begins. Also, determine the depth and volume of excess rainfall and its duration. = 40 mm/h, fe 10 mm/h, and k = 2 h. Assume that Time (h) Cumulative rainfall (mm) 25 70 115 140 160 180