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~~ <br />Allen Mine <br />Sedimentation Pond 007 <br />Runoff Storm Intensity <br />Area Acres 10Yr-24Hr 10Yr-Peak (IPH) <br />007-1 7.0 1.07 3.60 <br />007-2 21.0 2.19 2.24 <br />007-3 1.0 0.16 3.93 <br />007-4 3:8 0.60 2.81 <br />d07-5 3.5 0.55 3.29 <br />007-6 1.3 0.21 2.71 <br />Total 37:6 4.78 <br />• ~ <br />• ~ <br />Summary of Calculations <br />Contributing•Areas: <br />Sediment Detention: <br />60% Sediment load: 0.06 Ac-Ft per acre requires 2.26 Ac-Ft <br />100% sediment load: 0.10 Ac-Ft per acre requires 3.76 Ac-Ft <br /> Volume <br />Storage Ac-Ft <br />Bottom Pond - <br />60% Sediment 2.26 <br />100% Sediment 1.50 <br />Runoff ~ 4.78 <br />To Spillway 0.65 <br />Top of Pond - <br />TOTAL 9.19 <br />Surface <br />Acres Elevation <br />0.67 7,370. 0' <br />0.87 7,372. 9' <br />0.98 7,374. 5' <br />1.28 7,379. 0- ~a4 - ~•~ti <br />1.32 7', 379 . 5' <br />7,381.5' <br />Emergency Spillway: <br />The spillway will pass a 25-year, 24-hour storm <br />event. A one-foot freeboard will be maintained.. <br />15 <br />