Question: Using the rational method, the 100-year pre- and postdevelopment peak rates of runoff from a 50-acre residential development site are calculated at 20 and 50

Using the rational method, the 100-year pre- and postdevelopment peak rates of runoff from a 50-acre residential development site are calculated at 20 and 50 cfs, respectively.

Estimate the required storage to regulate the 100-year discharge from the site to 80% of the predevelopment peak rate of runoff. Assume that the runoff from the entire site is drained to a detention basin and the postdevelopment time of concentration is 30 minutes.

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