An area consists almost entirely of sandy loam with a saturated hydraulic conductivity of 11 mm/h, average suction head of 110m, porosity of 0.45, field capacity of 0.190, wilting point of 0.085, and depression storage of 4 mm. The design rainfail is given by: Interval (min)Average intensity (mm/h) 0-10 20 10-20 40 20-30 60 30-40 110 40-50 60 50-60 20 Assume the initial moisture conditions are midway between the field capacity and wilting point..