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To provide a minimum one foot of freeboard, the top of embankment <br />shall be at an elevation of 4327.8. <br />III. SEDIMENTATION RESERVOIR COLLECTOR DITCH DESIGN _ <br />Problem: Determine hydraulic data of a V shaped collector <br />ditch, depth of flow at the design storm and maximum <br />anticipated velocity. <br />Solution: Maximum Allowable Velocity, Vmax = 4.5 fps <br />Minimum Allowable Velocity, Vmin = 2 fps <br />q10 = 2.73 cfs (from Peak Discharge Calculations) <br />n = 0.03 (Manning coefficient for riprap) <br />sideslope = 2:1 (horizontal to vertical) <br />slope(s) = 0.005 feet/feet <br />Manning Equation: <br />q10 = 1.49 AR Z~a S /i <br />n <br />Hydraulic Data: <br />Q = 2.73 cfs <br />D = 0.303 feet <br />A = 0.91 feet= <br />R = 1.49 feet <br />s = 0.005-feet/feet <br />n = 0.03 <br />V = 3.0 fps <br />IV. TOTAL RESERVOIR VOLUME: <br />Liquid Volume = 0.22 Ac-Ft = 9583 cubic feet <br />Sediment Volume = 0.003 AC-Ft = 130 cubic feet <br />Minimum Reservoir Volume Required = 9713 cubic feet <br />Design Sedimentation Reservoir fora Volume of 18,000 cubic feet <br />Dimensions: <br />Bottom Length <br />Width <br />Depth <br />ss <br />350 feet <br />50 feet <br />2.05 feet <br />2:1 In <br />3:1 Out <br />