The rain falls uniformly for 1 hour at the rate of 2 in./h on a 100-acre watershed

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The rain falls uniformly for 1 hour at the rate of 2 in./h on a 100-acre watershed composed of: 25 acres, C = 0.3; 20 acres, C = 0.4; 40 acres, C = 0.6; and 15 acres, C = 0.90.

Calculate the peak rate of runoff, assuming a time of concentration of 1 hour.

What will be the peak discharge, if the time of concentration is 45 minutes?

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