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25 -Yr 24 -hr Event <br />Runoff Curve Number and Runoff <br />Project: SWB -6 <br />Location: Revenue <br />Developed <br />1. Runoff Curve Number (CN) <br />Cover description <br />Mined Land, Disturbed (Poor) <br />CN (weighted): 87.0 <br />Total Area: 8.131 Acre <br />2. Runoff <br />Return Period: <br />Rainfall, P: <br />Runoff, Q: <br />Runoff Volume: <br />10 -Yr 24 -hr Event <br />Graphical Peak Discharge <br />By: B Langenfeld Date: 05/23/12 <br />Checked: Date: <br />CN Soil Group Area(Acre) <br />87 C 8.131 <br />25 -Year <br />2.60 in <br />1.3952 in <br />0.9454 Acre -Ft <br />Project: SWB 6 <br />Location: Revenue Mine <br />Developed <br />1. Data: <br />Drainage area: .................... A <br />Runoff Curve Number: ............. CN <br />Time of Concentration: ........... Tc <br />Storm Type :....................... <br />Pond and swamp areas spread <br />throughout watershed ............... <br />2. Frequency ........................yr <br />3. Rainfall ,P(24 - hour) .............. in <br />4. Initial abstraction, Ia............ <br />5. Compute Ia /P ....................... <br />6. Unit peak discharge, qu ...... csm /in <br />7. Runoff ,Q .........................in <br />8. Pond & swap adjustment factor .... Fp <br />9. Peak Discharge,gp ...............cfs <br />Revenue Mine August 2012 6 -4 <br />By: B Langenfeld <br />Checked: <br />6.9550Acres <br />87 <br />0.35 <br />II <br />0.00 percent of A <br />0.0000 Acres <br />10 <br />2.60 <br />0.2989 <br />0.1149 <br />631.06 <br />1.3952 <br />1.00 <br />9.5679 <br />Date: 03/23/12 <br />Date: <br />