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FIGURE 4 <br /> PERIMETER SURFACE WATER DITCH - TRAPAZOIDAL DITCH WITH 2:1 SIDE SLOPE <br /> SLOPE: 0. 1 % <br /> ,� 3A <br /> 23 <br /> 250- <br /> 2.0 <br /> u <br /> U <br /> N200 h <br /> v ISO <br /> 1.0 > <br /> top <br /> 3 <br /> SO <br /> p A <br /> p 1 2 3 < S 6 <br /> Depth of Water (ft) <br /> o VdAW)A.p(ds)� <br /> DEPTH WIDTH 0 VEL BASE SIDE SLOPE .>. <br /> FEET FEET FT"3 S 1 (FTIS) 2 n 3 FEET 3 RV 3 3 <br /> 0 0 0 <br /> 0.5 8.0 2.3 0.7 0.04 6 2 0.001 <br /> 1 10.0 7.9 1.0 0.04 6 2 0.001 :. <br /> 1.5 12.0 16.6 1.2 0.04 6 2 0.001 <br /> 2 14.0 28.6 1.4 0.04 6 2 0.001 <br /> 2.5 16.0 44.3 1.6 0.04 6 2 0.001 <br /> 3 18.0 64.0 1.8 0.04 6 2 0.001 <br /> 3.5 20.0 87.9 1.9 0.04 6 2 0.001 .:: .... :: <br /> 4 22.0 116.3 2.1 0.04 6 2 0.001 �`i <br /> 4.5 24.0 149.6 2.2 0.04 6 2 0.001 <br /> 5 26.0 188.0 2.4 0.04 6 2 0.001 ;':,:,.;.w.`?::..:�'� "s :..: •..'.. <br /> 5.5 28.0 231.8 2.5 0.04 6 2 0.001 ..: .::...: `:... <br /> 6 30.0 281.2 2.6 0.04 6 2 0.001 ? Yk:: >.:..'.:..,. <br /> 6.5 32.0 336.51 2.7 0.04 1 6 2 1 0.001 '.l; •'.::':'' ':: <br /> METHOD, MAWNGS EQUATION FOR OPEN CHANNEL FLOW <br /> (1) 0 = V • AREA <br /> (2) VEL = 1.49 • R".666 • SLOPE".5 / n <br /> (3) NPUT PARAMETER FOR DITCH <br /> (4) AREA = (BASE + (DEPTH • SIDE RV)) • DEPTH <br /> (5) R = AREA/WETTED PERIMETER = AREA / (BASE + 2 0 (DEPTH-2 + (DEPTH • SIDE RV)-2 )".5) <br />