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• Assume affected area of 5 ac. <br />Ys = 40 tons/acre/year x 5 ac. = 200 tons/yr. <br />Volume of Sediment Delivered is: <br />= Ys (2000 lbs/ton) (1 acre) <br />1.5(62.4 lbs/f t3) (43,560 ft2) <br />Substituting Ys into the preceding formula gives a sediment <br />volume of 0.10 acre-ft/yr. <br />Assume the design of the sedimentation reservoir shall have a <br />sediment volume of 0.20 acre-ft. for 2 yrs. <br />(b) MUNGER CANYON SEDIMENTATION RESERVOIR EMERGENCY SPILLWAY <br />DESIGN <br />• Problem: <br />Determine dimensions of a V-shaped outfall ditch, <br />depth of flow at the design storm, and high-water-line <br />elevation of the reservoir. <br /> <br />Maximum allowable velocity, Vmax = 3 fps <br />Minimum allowable velocity, Vmin = 2 fps <br />Q25 = 3.40 cfs (From peak discharge calculations) <br />n = 0.03 (Manning coefficient for riprap) <br />sideslope = 5:1 (horizontal to vertical) <br />slope(s) = 0.02 ft./ft. <br />Q25 = 1.49 A R 2/3 21/2 <br />n <br />• Hydraulic Data: <br />Q = 3.44 cfs <br />D = 0.50 ft. <br />