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25 -Yr 24 -hr Event <br />Runoff Curve Number and Runoff <br />Project: SWB -8 <br />Location: Revenue Mine <br />Developed <br />1. Runoff Curve Number (CN) <br />Cover description <br />Mined Land, Disturbed (Poor) <br />CN (weighted): 87.0 <br />Total Area: 1.563 Acre <br />2. Runoff <br />Return Period: 25 -Year <br />Rainfall, P: 2.60 <br />Runoff, Q: 1.3952 <br />Runoff Volume: 0.1817 <br />Revenue Mine August 2012 6 -7 <br />By: B Langenfeld Date: 05/23/12 <br />Checked: Date: <br />CN Soil Group Area(Acre) <br />87 C 1.563 <br />in <br />in <br />Acre -Ft <br />