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Standard Ditch Design <br />Page 4 <br />STANDARD DITCH DESIGNS <br />2.5 Feet <br /> <br />R = 0.5 (2.5) 5 e 6.25 = 0.88 Ft. <br />2 (2:5)2 +.(2.5)2 ~ 7.07 <br />Vel = 1.486 (0.88) 2/3 (0.005) '~ = 3.22 Ft/Sec <br />0.030 <br />A = 6.25 Ft2 <br />Q = (Vel) A = (6.25) (3.22) 20.16 CFS <br />Q Design = Q/F.S. = 20.16 1.3 = 15.51 CFS <br />• <br />3.0 Feet <br />ie-6.6 ~-~I <br />I <br />3.0' <br />y <br />R = 0.5 (6.0) 3.0 = 9.0 1.06 Ft <br />2 (3)2 + (3)2 '~ 8.48 <br />Vel 1.486 (1.06) 2/3 (0.005) '~ = 3.64 Ft/Sec <br />0.030 <br />A 9.0 Ft2 <br />Q = 3.64 X 9.0 = 32.76 CFS <br />Q Design 32.76: 1.3 = 25.20 CFS <br />