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<br />• <br />TABLETR 91-31-2 (Cont.) <br />DIVERSIOPI DITCH DESIGiJ <br />Area 31/41 <br />Basin Area <br />(Acres) <br />31-1 121 <br />Cy QP <br />(cfs/in) <br />82 113 <br />Easin <br />Runoff Slope <br />(i~) (`-) <br />0.52 14 <br />Peak Flcw = 56 cfs for Basin 31-1 <br />Design for V Ditch <br />Side Slopes (z) = 1:1 <br />Ditch Slope (s) = 2.Oo <br />Mannings Pl (n) = 0.035 <br />Q = AV = 1.45 R2/3 51/2 A <br />n <br />Q = 56 = 1.49 z d 2/' (S)1/` (zd2) <br />0.035 2 z2 r,1 <br />Q = 50' = 42.57 d 2/3 (C.14) d2 <br />C2.B3~ <br />9.40 =(d 1 2/3 d2 <br />z.s3 <br />d = 3.0 <br />Flow Depth = 3.0 FT <br />Freeboard = 1.0 FT <br />Ditch Depth = 4.C FT <br />Velocity <br />Q =AV <br />V = Q/A <br />V = 56/zd2 <br />= 56/(3.0)2(1) <br />= 6.22 fps <br />Sloop <br />Adjus= <br />Factor <br />0.96 <br />Q~~`fs) <br />So <br />Ex. 29-23 <br />