A mildly sloped, undisturbed catchment area is covered with approximately 50% woods and 50% grass. For a 60-minute storm of 50 mm/h intensity, calculate:

a. Interception using the Brooks et al. method. Estimate S = 4 mm and neglect evaporation during the storm

b. Depression storage using Equation 3.3 with Sd = 20 mm.