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• <br /> <br />• <br />Pond 012 as-built calculations <br />Runoff Curve Number and Runoff <br />Project: POND 012 By: R. L. GUBKA Date: <br />Location: NEW HORIZON MINE Checked: Date: <br />80 C 12.152 Acres <br />0.500 12.152 Acres <br />85 C 42.933 Acres <br />0.500 42.933 Acres <br />10 yr <br />:2.00 in <br />Runoff, O ..............:0.74 in <br />Runoff Volume ..........:3.39 Acre-Ft <br />Present <br />UNDISTURBED <br />UNDISTURBED <br />DISTURBED <br />DISTURBED <br />CN (weighted): 84 <br />CF (weighted): 0.500 <br />2. Runoff <br />Frequency .............. <br />Rainfall, P (24-hour) .. <br />Graphical Peak Discharge <br />Project: POND 012 By: R. L. GUBKA Date: 03/29/05 <br />Location: NEW HORIZON MINE Checked: Date: <br />Present <br />1. Data: <br /> Drainage area :.............. ......A = 55.0850 Acres <br /> Runoff Curve Number :.. ...........CN = 84 <br /> Time of Concentration:.. .........Tc = 0.23 <br /> Storm Type :................... .... = II <br /> Pond and swamp areas spread <br /> throughout watershed .... ........... = 0.00 percent of A <br /> 0.0000 Acres <br />2. Frequency .................... ....yr = 10 <br />3. Rainfall,P(24-hour) ....... .......in = 2.00 <br />4. Initial abstraction, la..... ....... = 0.3810 <br />5. Compute la/P ............... ........ = 0.1905 <br />6. Unit peak discharge, qu ......csm/in = 714.44 <br />7. Runoff,O ....................... ..in = 0.7439 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp ....... ........cfs = 45.7428 <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 />Attachment 2.05.3(3)13- 1 <br />