A 53,200-acre area has a ϕ index of 0.10 in./hr. A storm with a constant rainfall rate of 0.7 in./hr lasts for 6 hr.
(a) What is the rational formula peak discharge in cfs if the time of concentration is 4 hr?
(b) What is the runoff rate (in cfs) at the end of the fifth hour after the rainfall begins?
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