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Asb-6 <br />II. SEDIMENTATION RESERVOIR EMERGENCY SPILLWAY DESIGN <br />• Problem: Determine hydraulic data of a V -shaped outlet <br />ditch, depth of flow at the design storm, and high <br />waterline elevation of the reservoir. <br />Solution: Maximum allowable velocity, Vmax - 3fps <br />q25 = 3.6 cfs (from Peak Discharge Calculations) <br />n = 0.03 (Manning coefficient for riprap) <br />sideslope = 2.1 (horizontal to vertical) <br />slope(s) = 0.01 feet/feet <br />Manning Equation: <br />q25 = 1.49 AR 2/3 S ~ <br />n <br />Hydraulic Data: <br />Q = 3.6 cfs <br />D = 0.84 feet <br />A = 1.41 feet2 <br />R = 0.38 feet <br />s = 0.01 feet/feet <br />n = 0.03 <br />V = 2.55 fps <br />Assume reservoir high waterline to discharge the de- <br />sign storm is equal to the spillway invert elevation <br />plus the depth of flow in the outlet channel: <br />H.W.L. 25 year = 5280.20 + 0.84 = 5281.04 <br />To provide a minimum one foot of freeboard, the top of <br />embankment shall be at an elevation of 5281.04 " 5,282 <br /> <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 />~1f r r. t v ^. l <br />r ~ :_ <br />