Please show the steps to solve for S watershed storage in in

Problem 4: Estimate the SCS CN for a 300-acre development from a rainfall event with an intensity of 2 inches/hour that lasted for two hours. The runoff volume is 12 inches

Solution

Solution:-

According to water budget equation,

Mass inflow - mass outflow = Change in storage

Precipitation - runoff = change in storage

Change in storage = (( 2 inch/ hr) * 2 hr + 12 ) - 12

Change in storage = 4 inch