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II. JAIL <br />SITE, INCLUDING EXISTING NORTH -SOUTH <br />ALLEY <br />A. <br />Existing runoff coefficient <br />Lots Area S.F. <br />C Exist <br />C. x A <br />21 thru 30 30,000 <br />0.7 <br />21,000 <br />Alley 6,250 <br />0.9 <br />5,625 <br />Subtotal 36,250 S.F. <br />26,625 <br />(0.83 Acre) <br />Weighted C = 26,625 S.F. = 0.73 <br />e 36,250 S.F. <br />B. <br />Slope, SW - NE Corners <br />S = 224.5' 198- - 0.092, Use 10% <br />289 <br />C. <br />Runoff Velocity, Fig. 1 = 8 FPS <br />D. <br />Te = + 10 = 10.6 Min. <br />828960 <br />E. <br />Rainfall Intensity, i, Figure 2 = 1.7 in./hr. <br />F. <br />Qa=Cex i xA=0.73x 1.7x0.83= <br />1.04 <br />G. <br />Qo = Qa = 1.04 = 1.39 <br />A Cd 0.33 x 0.9 <br />H. <br />T = -25 + V2--254 = 25 + \12254 = 15.27 <br />Qo 1.39 -- <br />I. V = 3607T _ 40 Q T = 3607 x 15.27 - 40 x 1.39 x 15.27 = 518.73 <br />s T+25 0 <br />J. Vi = Vs x A x Cd = 518.73 x 0.83 x 0.9 = 387.49 <br />