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• A = 1.25 ft2 <br />R = 0.25 ft <br />s = 0.02 ft/ft <br />n = 0.03 <br />V = 2.67 fps <br />Assume reservoir high-water-line to discharge the design storm <br />is equal to the spillway elevation plus the depth of flow in <br />the outfall channel: <br />H.W.L.25 yr = 5607.9 + 5608.4 ft. <br />c) Munger Canyon Sedimentation Reservoir - Outfall Design <br />Summary <br />The emergency spillway shall be located in the northwest corner <br />• of the reservoir because of a natural depression as shown on <br />the Munger Canyon Mine Site-Plan drawing. Figure ( ) <br />In designing the outfall, it was assumed that discharge water <br />with a velocity of less than or equal to 3 fps is not capable <br />of creating an erosion problem in a riprapped channel. <br />d)' Munger Canyon Sedimentation Reservoir Collection Ditch <br />Design <br />Problem: <br />Determine dimensions of a V-shaped collector ditch, depth of flow <br />at the design storm and maximum anticipated velocity. <br />Solution: <br />Maximum allowable velocity, Vmax = 3 fps <br />Minimum allowable velocity, Vmin = 2 fps <br />• <br />