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Allen Mine <br />Sedimentation Pond 004 <br />Summary of Calculations <br />Contributing Areas: <br />Runoff Storm Intensity <br />Area Acres 10Yr-24Hr 10Yr-Peak (IPH) <br />004-1 5.8 0.47 3.65 <br />Sediment Detention: <br />60~ Sediment load: 0.06 Ac-Ft per acre requires 0.35 Ac-Ft <br />100 sediment load: 0.10 Ac-Ft per acre requires 0.58 Ac-Ft <br /> Volume Surface <br />Storage Ac-Ft Acres Elevation <br />Bottom Pond - 1.69 7,448.0' <br />60R Sediment 0.35 1.70 7,448.2' <br />1009 Sediment 0.23 1.72 7,448.5' <br />Runoff 0.47 1.92 7,449.0' <br />To Spillway 2.22 2.12 7,452.0' <br />Top of Pond - 7,454.5' <br />TOTAL 3.27 <br />Emergency Spillway: <br />Th,e spillway will. pass a 25-year, 24-hour storm <br />event. A one-foot freeboard will be maintained. <br />9 <br />• <br />L <br />