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Assumptions: <br /> Using a curve number of 86 for unsorted gravel with no vegetation, <br /> a Type 2-100 year 24 hour storm of 3.0 inches, <br /> Survcadd hydrologic calculations show the following: <br /> North Side of Crossing <br /> Runoff Curve Number and Runoff <br /> Project: JRS Mining By: Greg L 07123115 <br /> Location: North Side Road Crossing <br /> Developed <br /> 1. Runoff Curve Number (CN) <br /> Cover description CN Soil Group Area(Acre) <br /> porous gravel 86 C 0.080 <br /> CN (weighted) : 86.0 <br /> Total Area: 0.080 Acre <br /> 2. Runoff <br /> Return Period: 100-Year <br /> Rainfall, P: 3.00 in <br /> Runoff, Q: 1.6625 in <br /> Runoff Volume: 0.0111 Acre-Ft <br /> This area of.011 acre feet is 17.7 cubic yards Therefore, the lowest swale must be able to <br /> hold this volume to prevent a discharge. The Swale and road will be created to contain this <br /> volume. <br /> South Side of Crossing <br /> Runoff Curve Number and Runoff Thu Jul 23 12:32:26 <br /> 2015 <br /> Project: JRS Mining By: Greg L Date: <br /> 07123115 <br /> Location: South Side Road Crossing Checked: Date: <br /> Developed <br />