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SOIJTH14EST PARKING LOT (LOTS 11 THROUGH 15) <br />A. Existing Runoff Coefficient <br />Lot Nos. Area, S.P. <br />Cexist. <br />11, 12 6,000 <br />0.9 <br />13 3,000 <br />0.7 <br />14, 15 6,000 <br />0.9 <br />Subtotal 15,000 S.F. <br />(0.34 Acre) <br />Weighted C ,900 = 0.86 <br />9 e 1215,000 <br />B. Slope, SW - NE Corner <br />S = 236no— — = 0.04 or 4% <br />C. Runoff Velocity, Fig. 1 = 4 FFS <br />D. <br />Tc 4 Fps 182'--wq + 10 min. <br />= 10.76 min. <br />E. Rainfall Intensity, i, Fig. 2 = <br />1.9 in./hr. <br />F. Qa=Cex i xA=0.86 x 1.9 x <br />0.34 Acre = 0.56 <br />G. = Qa = 0.56 = 1 83 <br />o A.Cd 0.34 x 0.9 —= <br />CexA <br />5,400 <br />2,100 <br />5,400 <br />19,900 <br />H. T = -25 + 2254 _ 2254 <br />(10 Year Storm) _ -25 + ti 1 - 10.09 <br />0 <br />I. V = 3607 T _ 40 Q T - 36112.2 s TT +7 o 9 _ 40 x 1.83 x 10.09 = 299.09 <br />J. VT = Vs x A x Cd = 299.09 x 0.34 x 0.9 = 91.52 C.F. <br />t�a"wv D <br />APR 1 N 1963 <br />.................... <br />cry of MMETT <br />