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9. Watershed X <br />• Drainage Area 31 Ac <br />2 <br />(31 Ac)(Im~A~) _ .04B mi? <br />Qio = 59.7 (.048)(•709) 7.fl CFS <br />Culvert Sizing <br />Q = 7.0 CFS D = 18"B C.M.P. <br />Check. with D = 18"D. Q = 8 CFS <br />HW = 1.2 - 1.50 <br />D <br />36"B L.M.P. for Watersheds F and X <br />Runoff developed from Watersheds F and X = 55.1 CFS <br />(Culvert flowing at 3/4 full) <br />1 486 a5/3 8 1/2 <br />Q = n~ <br />~ 2/3 <br />S a (1. 8 a5/3) <br />S = ((55.1)(.015)(7)2/3) <br />1.486 (7.1)5 3 <br />5 = .0060 ft/ft <br />8 ~ 0.60$ <br />n .015 Metal Pipe <br />Q ° 55.1 CFS <br />a - r2 = 7.1 ft2 <br />P=7ft. <br />If the slope of the culvert is less than 0.6$ than a 36"b C.M.P. <br />will control the runoff. If the slope is greater than 0.6$ then a <br />42"B C.M.P. should be installed to adequately pass the flow under the <br />access road. <br />_ ~J - <br /> <br />