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SWB -4 100YR Runoff.txt <br />Runoff Curve Number and Runoff Mon Nov 26 15:21:55 2012 <br />Project: SWB -4 By: B Langenfeld Date: 11/26/12 <br />Location: Revenue Mine Checked: Date: <br />Developed <br />1. Runoff Curve Number (CN) <br />Cover description CN Soil Group Area(Acre) <br />Oak -Aspen & Mt brush (Poor) 74 C 24.733 <br />Open Space -Poor ( <50% grass) 89 D 5.805 <br />CN (weighted): 76.9 <br />Total Area: 30.538 Acre <br />2. Runoff <br />Return Period: 100 -Year <br />Rainfall, P: 3.20 <br />Runoff, Q: 1.2028 <br />Runoff Volume: 3.0609 <br />Page 1 <br />in <br />in <br />Acre -Ft <br />