Mathematics Grade Prototype Curriculum Guide

Rv = [(0.6 inches/12 inches/foot)][(0.75 acre)(43,560 square feet/acre)] Rv =1,633.5 cubic feet or 60.5 cubic yards Assuming that the stored runoff will exfiltrate completely into the ground within 72 hours, the infiltration structure must have a storage volume of 1,633.5 cubic feet. ................
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