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9. Watershed X <br />• Drainage Area ~ 31 Ac <br />2 <br />(31 Ac)(lm~~ Ac) ~ .048 ml? <br />Qlo ~ 59.7 (.048)(•709) ~ 7.O CF5 <br />Culvert Stztng <br />Q ~ 7.0 CFS D ~ 18"0 L.M.P. <br />Check, with D ~ 18"b, Q ~ 8 CFS <br />HW ~ 1.2 - 1.50 <br />D <br />36"A C.M.P. for Watersheds F and X <br />Runoff developed from Watersheds F and X ~ 55.1 LFS <br />(Culvert flowing at 314 full) <br /> <br />1.486 a5/3 8 1/2 <br />Q=nom <br />n ~ .015 Metal Pipe <br />Q ° 55.1 CFS <br />a ~ r2 ~ 7.1 ft2 <br />p - 7 ft. <br />~ 2/3 <br />5 ~ (1~ 8513) <br />5 ~ ((55.1) (.015) (7)2/3) <br />1.486 (7.1)5 3 <br />5 ~ .0060 ft/ft <br />8 - 0.60$ <br /> <br />If the slope of the culvert is less than 0.6$ than a 36"D 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 />