1.0-ha (2.47-ac) parcel of agricultural land is to be developed into medium density residential housing. The soils on the property are in hydrologic soil group C with an average slope of 3 percent. Compute the runoff for the parcel before and after development for a 25-year return period storm. The estimated time of concentration was 30 minutes before development and 20 minutes after development. Coefficients for the rainfall intensity equation are a = 2,261 for / in mm/hr (89 for / in in./hr), b = 8.5, and c = 0.754.
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