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• Table 23-9 <br />POND DESIGN SUFPWRY <br />POND I <br />Three-year Sediment Yield (acre ft) 2.55 <br />Elevation Three-year Sediment (ft) 8,157.30 <br />Yolume 10-year, 24-hour Event (acre-ft) 8.52 <br />Volume Gro undwater Pumping (acre-ft) 0.56 <br />Elevation 10-year, 24-hour Event Plus Pumping 8,162.96 <br />Elevation Primary Outlet Invert (ft) 8,157.50 <br />Elevation Emergency Spillway Invert (ft) 8,162.96 <br />Elevation Crest 25-year, 24-hour Event Plus Pumping (ft) 8,163.65 <br />Elevation Design Top of Structure (ft) 8,164.7 <br />Freeboard (ft) 1.05 <br />• <br /> <br />23-139 <br />