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• Runoff Curve Number and Runoff <br />12/07/2001 14:05 <br />Project: 008 POND By: R L GUBKA, PE Date: 12/07/01 <br />Location: NEW HORIZON MINE Checked: Date: <br />Present <br />MINE DISTURBANCE 85 C 25.193 Acres <br />MINE DISTURBANCE 0.500 25.193 Acres <br />RECLAIMED IRRIGATED PASTURE 71 C 85.243 Acres <br />RECLAIMED IRRIGATED PASTURE 0.500 85.243 Acres <br />CN (weighted): 74 <br />CF (weighted): 0.500 <br />2. Runoff <br />Frequency ..............: 25 yr <br />Rainfall, P (24-hour) ..: 2.4 in <br />Runoff, O ..............:0.56 in <br />Runoff Volume ..........:5.16 Acre-Ft <br />Graphical Peak Discharge 12/07/2001 14:08 <br />Project: 008 POND By: R L GUBKA, PE Date: 12/07/01 <br />Location: NEW HORIZON MINE Checked: Date: <br />• P <br />resent <br />1. Data: <br />Drainage area :................. ...A = 110.4360 Acres <br />Runoff Curve Number :.... .........CN = 74 <br />Time of Concentration:.... .......Tc = 1.06 <br />Pond and swamp areas s pread <br />throughout watershed ...... ......... = 0.00 percent of A <br />0 .0000 Acres <br />2. Frequency ....................... .yr = 25 <br />3. Rainfall,P(24-hour) ......... .....in = 2.40 <br />4. Initial abstraction, la....... ..... = 0.7027 <br />5. Compute la/P .................. ..... = 0.2928 <br />6. Unit peak discharge, qu.. ....csm/in = 284.01 <br />• Attachment 2.05.3(3)4- 4 <br />