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Runoff Curve Number and Runoff <br />11/30/2007 07:35 <br />Project: O13POND By: R L GUBKA Date: <br />Location: NEW HORIZON MINE Checked: Date: <br />Developed <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />dryland pasture 86 C 38.110 Acres <br />CN (weighted): 86 <br />2. Runoff <br />Frequency ..............: 10 yr <br />Rainfall, P (24 -hour) ..: 2.0 in <br />Runoff, Q ..............: 0.8490 in <br />Runoff Volume ..........: 2.6963 Acre -Ft <br />C- Factor Calculation <br />Project: O13POND <br />Location: NEW HORIZON MINE <br />Developed <br />C- factor (CF) <br />Cover description CF <br />DRYLAND RECLAMATION <br />11/30/2007 07:38 <br />By: R L GUBKA Date: 11/30/07 <br />Checked: Date: <br />Area(Acre) <br />0.500 38.110 <br />CF (weighted): 0.500 <br />Total Area: 38.110 Acre <br />Graphical Peak Discharge <br />Project: O13POND <br />Location: NEW HORIZON MINE <br />11/30/2007 07:53 <br />By: R L GUBKA Date: 11/30/07 <br />Developed <br />1. Data: <br />Checked: Date: <br />Drainage area: .................... A = 38.1100 Acres <br />Runoff Curve Number: ............. CN = 86 <br />Time of Concentration: ........... Tc = 0.26 <br />Revised August 2009 (PR06) Attachment 2.05.3(3) -21 -3 <br />