In a land development project, the peak flow before construction is 40 cfs. The peak flow after construction is estimated to be 120 cfs. The local planning board requires that the peak runoff leaving the site after development be no greater than the 40-cfs predevelopment rate and that on-site storage be provided to accomplish this. If the detention basin will have an average depth of 4 ft at full volume, approximately how many acres of the site will have to be used for the basin? Assume that the time of concentration is 30 min.
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