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TABLE 2.05.3(3) -15 -1 <br />THE DESIGN PARAMETERS OF POND 015 AREAS FOLLOWS: <br />Watershed Area (Acres) <br />5.5 <br />Curve Number <br />83.5 <br />100 Yr 24 Hr Event Inches (NOAA) <br />3.0 <br />Sediment Volume (Acre Feet) <br />0.04 <br />100 Yr EventRunoff Volume (Acre Feet) <br />0.68 <br />Total Volume Required (Acre Feet) <br />0.72 <br />Peak Discharge in (CFS) <br />12.71 <br />Peak Discharge Out (CFS) <br />0.0 <br />Sediment trap Efficiency <br />NA <br />Peak Stage <br />NA <br />Primary Spillway Elevation <br />NONE <br />Emergency Spillway Elevation <br />NONE <br />Pond 015 is a pre -mine pond design to capture and contain without discharge, the 100 -year 24- <br />hour event over the worst case drainage area of 5.5 acres. This worst case drainage area is of <br />both undisturbed areas between the diversion and collection ditches, and the topsoil stripping <br />area immediately west of the pit. The drainage area for Pond 015 can be seen on Map <br />2.05.3(3) -15. <br />Pond 015 does not meet the criteria of 30 CFR 77.216(a) as it does not have an embankment <br />greater than 20 feet in height, nor does it store 20 acre -ft or more of water behind a 5 foot <br />embankment. <br />REVISED MAY 2010 Attachment 2.05.3(3) -20.3 <br />