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SHERIDAN ENTERPRISES, INC. <br />COMA PROSPECT <br />• 10 YR FLOW <br />Drainage Calculations <br />Ref. - Technical Manual No. 1 (Manual for Estimating Flood Characteristics <br />of Natural-Flow in Colorado)(by J.F. McClain and R. D. Jarrett, U. S. <br />Geological Survey) <br />Southern Plateau Region (of Colorado) Area (m 12) <br />Qio - 59.7A(•709) <br />1. Combined Watersheds A b B <br />Drainage Area = 59 Ac + 647 Ac 706 Ac <br />2 <br />(706 Ac)(lm~ Ac) 1.103 mi? <br />Qio = 59.7 (1.103)(•709) = 64 CFS <br />Culvert Sizing (C.M.P, with Inlet Control) <br />Ref. - (Handbook of Steel Drainage S Highway Construction Products) <br />• Fig. 4-18 (Pg. 161); Scale 1 (Headwall or End Section) <br />Q = 64 CFS - D = 48"0 C.M.P. <br />Check, with D =48"0 Q = 80 CFS <br />Hw - t.t 1.50 ~ <br />D ' <br />2. Watershed A <br />Drainage Area 59 Ac <br />2 <br />(59 Ac)(im~ 0 Ac) _ .092 ml? <br />Qio = 59.7 (.092)(•709) = 11 CFS <br />Culvert sizing <br />Q = 11 CFS D 21"8 C.M.P. <br />Check, with D 21"d. Q = as CFS <br />HW = 1.2 - 1.50 <br />D <br /> <br />;~ - <br />