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r1 <br />u <br />DESI6N PARAMETERS <br />SEDIMENTATION PONDS <br />Parameter <br />Design Size Requirements <br />Emergency Spillway Precipitation Event 25-year. 24-hour <br />100-year. 6-hour <br />Where Applicable <br />Principal Spillway Precipitation Event 10-year. 24-hour <br />Runoff Volume Contained 10-year, 24-hour <br />Sediment Volume Contained 3 year <br />Outflow Structures <br />Emergency Spillway Type Riprapped lined <br />channel <br />Principal Spillway Type Type 3 CMP Riser <br />Embankment <br />Freeboard (Ft. above emergency spillway <br />• design event) 1.0 foot (Min.) <br />Top Width Calculated <br />L~ <br />Slope - Upstream Side 3.0 H:lY <br />Slope - Downstream Side 2.5 H:1V <br />Calculation Methods <br />Emergency Spillway Flow Weir Equation <br />Principal Spillway Flow Equation for Orifice Flow 8 <br />Equations for Drop Inlet <br />Runoff Yolume SCS Method <br />Sediment Yolume 30 CFR 816.46(b) <br />23-6 <br />