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SwB -1 Initial 100 YR Runoff CN and Runoff.txt <br />Runoff curve Number and Runoff Thu Jan 10 14:50:27 2013 <br />Project: SwB -1 Initial <br />By: B Langenfeld <br />Date: <br />01/10/13 <br />Location: Revenue Mine <br />checked: <br />Date: <br />Present <br />1. Runoff Curve Number (CN) <br />Cover description <br />CN Soil Group <br />Area(Acre) <br />Bare rock <br />89 <br />3.992 <br />oak -Aspen & Mt brush (Poor) <br />66 B <br />2.308 <br />Oak -Aspen & Mt brush (Poor) <br />74 C <br />18.699 <br />Old mine waste <br />74 <br />5.377 <br />CN (weighted): 75.4 <br />Total Area: 30.376 Acre <br />2. Runoff <br />Return Period: <br />100 -Year <br />Rainfall, P: <br />3.20 <br />in <br />Runoff, Q: <br />1.1148 <br />in <br />Runoff volume: <br />2.8221 <br />Acre -Ft <br />Page 1 <br />