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~urnett <br />OnSUItIIKJ T <br />ngineers a <br />Ref 1: III-15 <br />Ref 2: Fig 3-2 <br />p.o. box 121 <br />cowdrey, co 80434 <br />(970)723-4061 <br />Time of Concertration <br />CLIENT: Gty of 6reeky <br />PROJECT: gEv <br />PROJECT NO.: 02.08 <br />DATE: 1/22/2003 <br />BY: TEB <br />CNerland flow: 0 yr 100 yr <br />Upstream elev <br />Dnstream elev <br />Flow length in feet, L <br />Land slope in percent, 5 <br />Coefficient,C 0.00 0.40 <br />T =1.8 * (1.1-C) " L"0.5 / S"0.33 0.0 min 0.0 min <br />Sheet flow <br />Upstream elev 4720.00 <br />Dnstream elev. 4694.00 <br />flow length in feet, L 640 <br />Slope in percent, S 4.06% <br />Average velocity in fps, V ~ 1.6 <br />T = L /(60 * V) ~ 0.0 min 6.7 min <br />Pipe or Channel flow <br />Upstream elev <br />Dnstream elev , <br />Chonnel length in ft, L <br />Channel slope in ft/ft, s <br />Diameter in inches <br />Cross section flow area in sq ft, A 0.00 0.00 <br />Wetted perimeter in ft, Pw 0.00 0.00 <br />Hydraulic radius in ft, R = AlPw 0.00 <br />Monning's roughness coefficient, n <br />Flow velocity in fps, V=1.49(R"2/3)(s"1/2yn <br />T = L /(60 " V) 0.0 min 0.0 min <br />Sum for: Time of Concentration in mirwtes, Tc 0 min 7 min <br />but not > Tc =(L/180)~t0 (Denver Urban) 10 min 14 min <br />But not less than: 5 min 5 min <br />Recommend Tc = 5 min 7 min <br />USE Tc = ~ 7.0 min <br />g38asinl.xls Page 2 <br />