The runoff coefficient is 0.90, and the time of concentration is 20 minutes for a 10-acre watershed. Which of the following design rainfall storms, associated with the same annual exceedance frequency, results in the greatest peak discharge by the rational formula: (a) 2.2 inches uniformly distributed over a duration of 20 minutes or (b) 2.6 inches uniformly distributed over a duration of 30 minutes. Explain why the rainfall duration is set equal to the time of concentration in the rational method.
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