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• Runoff Curve Number and Runoff <br />Project: POND 012 By: R . L. GUBKA <br />Location: NEW HORIZON MINE <br />Present <br />CN C AREA <br />UNDISTURBED 80 C 12.152 Acres <br />DISTURBED 85 C 42.933 Acres <br />CN (weighted): 84 <br />CF (weighted): 0.500 <br />2. Runoff <br />Frequency ..............: 10 yr <br />Rainfall, P (24-hour) ..:2.00 in <br />Runoff, O ..............:0.74 in <br />Runoff Volume ..........:3.39 Acre-Ft <br />• Time of Concentration (SCS Method) <br />Curve Number: 84 <br />Length of Flow (ft): 1354.62 <br />Average Land Slope Q: 6.40 <br />Time of Concentration (hrs): 0.23 <br />Pond Report <br />Top of dam elevation: 5610.0000 <br />Bottom of pond elevation: 5603.0000 <br />Top of dam width: 10.0000 <br />Cut slope percent grade: 100.00, slope ratio: 1.00 <br />Fill slope percent grade: 25.00, slope ratio: 4.00 <br />Interior slope percent grade: 40.00, slope ratio: 2.50 <br />Lower left grid corner :1114657.98,601617.47 <br />Upper right grid comer: 1117967.98,603397.47 <br />X grid resolution: 331, Y grid resolution: 178 <br />• X grid cell size: 10.00, Y grid cell size: 10.00 <br />REVISED MARCH 2006 Attachment 2.05.3(3)-12-3 <br />