The watershed described in Problem is to be developed as an industrial area, with a runoff coefficient of 0.9. Part of the stream is channelized, increasing the average flow velocity to 0.4 m/s. Assume that the overland flow time remains the same. Determine the 100-year peak discharge from the watershed under developed conditions.
Problem
A 0.45-km2 watershed has a composite runoff coefficient of 0.33. The overland flow distance to the beginning of a stream that drains the watershed is 200 m, and the ground slope is 5 percent. The stream is 750 m long, with an average flow velocity of 0.25 m/s. Estimate the peak rate of runoff for the 100-year storm.
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