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X3 <br />C & C Truck Parts 3-18-88 <br />87-4531 R.E.M. <br />Detention Requirements <br />Ex. Slope Overland = 7% <br />Ex. Ground Cover: 1,700 S.F. (0.039 Ac.) Imp. Rooftop <br />1.51,550 S.F. (3.02 Ac.) Perv. Lt. Grs., Trees <br />Prop. Ground Cover: 20,900 S.F. (0.48 Ac.) Landscape <br />112,350 S.F. (2.58 Ac.) Imp. Asp. <br />Design Storm: Powder mill basin <br />2 yr. release - 25 yr. storm 04, <br />Peak Rate Runoff: (7%) <br />(2 yr.) Ex. Rooftop: 0.986 <br />Ex. Grd. Cover: 0.108 O c <br />Total All,Release Rate. = 0.039 (.986) + 3.02 (.108) <br />= 0.365 CFS <br />= 0.119 CFS/Ac 414 <br />Storage Req'd: (0.119 CFS/Ac) <br />(25 yr.) Landscape: 948.8 CF/Ac Off. <br />Asp.: 4,222.5 <br />Total Detention Req'd = 0.48 (948.8) + 2.58 (4222.5) <br />= 11,350 CF p,C <br />.•' pN D E. ' <br />i0 <br />•w •e•' 3-JI-VV <br />