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SENECA II WEST MINE <br />POND 006 PRE-SETTLING BASIN PHASE IV SUMMARY <br />Run-off Volume (10-year, 24-hour) 19.95 ac-ft <br />Peak Discharge (25-year, 24-hour) 186.3 cfs <br />Sediment Volume (1 year) 12.27 ac-ft <br />Outlet Works <br />Emergency Spillway: Trapezoidal Channel <br />Bottom Width 10 ft <br />Side Slopes 3H:lV <br />Invert 7]16.0 <br />Peak V1'ater Elevations <br />10-year, 24-hour 7118.0 ft <br />25-year, 24-hour 7118.6 ft <br />Top of Embankment 7120.0 ft <br />Freeboard 1.4 ft <br />Sediment Storage (2.0 ft below principal spillway invert) ] 3.47 ac-ft <br />Years Storage 1.1 years <br />Peak Settleable Concentration (10-year, 24-hour) 10.81 ml/I <br />• <br />• <br />