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SWB -1 100 YR Runoff CN and Runoff.txt <br />Runoff Curve Number and Runoff Thu Jan 10 14:30:22 2013 <br />Project: SWB -1 By: B Langenfeld Date: <br />01/10/13 <br />Location: Revenue Mine Checked: Date: <br />Present <br />1. Runoff Curve Number (CN) <br />Cover description CN Soil Group Area(Acre) <br />Bare rock 89 3.907 <br />Oak -Aspen & Mt brush (Poor) 66 B 2.203 <br />Oak -Aspen & Mt brush (Poor) 74 C 12.986 <br />Old mine waste 74 3.552 <br />CN (weighted): <br />Total Area: <br />75.8 <br />22.648 Acre <br />2. Runoff <br />Return Period: 100 -Year <br />Rainfall, P: 3.20 <br />Runoff, Q: 1.1408 <br />Runoff Volume: 2.1531 <br />Page 1 <br />in <br />in <br />Acre -Ft <br />