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<br />DESIGN PARAMETERS <br />SEDIMENTATION PONDS <br />Parameter <br />Design Size Requirements <br />Emergency Spillway Precipitation Event 25-year, 24-hour <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 Type 3 CMP riser <br />Principal Spillway Type Orifice <br />Embankment <br />• Freeboard (Ft. above emergency spillway <br />design event) 1.0 foot (min.) <br />Top M1dth 12 feet (min.) <br />Slope - Upstream Side 3.0 H:1V <br />Slope - Downstream Side 3.0 H:1V <br />• <br />Calculation Methods <br />Emergency Spillway Flow Equation for orifice <br />flow combined with <br />drop inlet <br />Principal Spillway Equation for orifice <br />flow <br />Runoff Volume SEDCAD+ Model <br />Sediment Volume Revised Universal <br />Soils Loss Equation <br />(SEDCAD+) <br />23-56 <br />