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• <br />r <br />• <br />C::%~~ .-c[ ions: <br />I <br />l <br />1 ? <br />(' <br />2-Yr, 25-}!r zyent - 1.]" _> 0.(•1" rums;: <br />10 -Yr. '_4-Hr eyenl - 1.7" _> CI. 1v" runoff <br />Q = Pzal: dischargz (CFS/in) }: runoff z correction fgc[or <br />values o:`. Q are ,hoi:n in Table 1 <br />Q = VA =~ V = Q/A <br />also <br />`, - 1.49 (n '/s)(S1/') (`tannings equation) <br />N <br />ld'n ere: Q = Flow Quantity (Ft3/sec) <br />7 <br />A = );-sectional area of flew = d- (F[ ) <br />V = Velocity of Flo-.: (FC/sec) <br />.' N = kou~h^ess coefficiznC = 0.04 <br />P. = 1lvdraulic radius = 0.3536 d (Fl) <br />S = Gradient of Uiaersion = 0.01 (Ft/FC) <br />Setting [he two equztions equal b soivin;} for d: <br />I' Q/F. = 1.49 (R)2/3 (S)1/2 <br />~~ N <br />i ~ ..!i <br />Q = 1.49 (0.3536d)2/3 (0.01)1/2 <br />~ d2 0.04 <br />iQ: = 1.8625 (d)2/3 <br />b <br />d- <br />1 ~ 2-2/3 <br />~~ Q: _ ].5625 d <br />.' <br />ii ' <br />i~ (~? Q ) 0.3750 = d <br />(1.5625) <br />Once d is known, V can be del ermined by: <br />V Q = Q <br />A d2 <br />T-4 <br />i ;) <br /> <br />