Runoff from a development 600 m (1,968 ft) X 1,200 m (3,936 ft) is concentrated in a single channel. The time of concentration is estimated as 60 minutes before development and 30 minutes after development. Compute the runoff before and after development using the rainfall intensity equation listed in Problem 10.2, with a runoff coefficient of 0.2 before development and 0.5 after development.
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