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• CULVF.I~P DESI(3d <br />Culvert No: C-10 <br />Description: Diversion ditch 22D4 crossing haulroad <br />Peak Discharge: 24.67 cfs <br />Design: <br />~ 20 percent <br />n= .017 roughness coefficient <br />,~ 42 p= x D <br />HI-h= .25 D <br />~(1.49/n) (A) (RH) 2/3 S .5 <br />~(1.49/n) (.25) (3.14) D? (.25D) 2/3 5 .5 <br />X0.47 D 2.6750.5 <br />n <br />2.6 ~ n <br />D = 0.4750.5 <br />2.67 <br />D = 24.67 (.017) <br />.47 4.5) <br />D = 1.28 feet <br />Use 18" (~].vert <br /> <br />