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Post -Development Calculations: <br />Impervious area <br />Peak runoff (See Table 5) <br />Peak rate of runoff <br />Landscaped area <br />Peak runoff (see Table 3) <br />Peak rate of runoff <br />= 0.14 acres x .75 <br />= 0.105 Ac <br />= 1.40 cfs/Ac <br />= 0.105 x 1.40 <br />= 0.147 cfs <br />= 0.14 Ac x 0.25 <br />= 0.035 Ac <br />= 0.41 cfs/Ac <br />= 0.035 x 0.41 <br />= 0.014 cfs <br />Total Post -development Peak Rate of Runoff <br />0.170cfs + 0.008 cfs = 0.161 cfs <br />Detention Requirements: <br />Impervious: 0.147 cfs <br />Detention: (See Table 6) = 2911 CF/AC <br />.105 x 2911 = 306 cf <br />Landscaped 0.014 cfs <br />Detention: (See Table 6) = 1030 CF/AC <br />0.035 x 6362 = 36cf <br />342 cf <br />