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SWB -7A 100YR Runoff.txt <br />Runoff Curve Number and Runoff Mon Sep 16 10:22:56 2013 <br />Project: SWB -7A <br />By: B Langenfeld <br />Date: <br />09/16/13 <br />Location: Revenue Mine <br />checked: <br />Date: <br />Developed <br />1. Runoff Curve Number (CN) <br />Cover description <br />CN Soil Group <br />Area(Acre) <br />Open space -Poor ( <50% grass) <br />68 A <br />1.577 <br />Mined Land, Disturbed (Poor) <br />87 C <br />0.491 <br />Herbaceous mixture (Fair) <br />71 B <br />0.108 <br />CN (weighted): 72.4 <br />Total Area: 2.176 Acre <br />2. Runoff <br />Return Period: <br />100 -Year <br />Rainfall, P: <br />3.20 <br />in <br />Runoff, Q: <br />0.9526 <br />in <br />Runoff volume: <br />0.1727 <br />Acre -Ft <br />Page 1 <br />