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Runoff Curve Number and Runoff Wed Sep 28 16:37:36 <br /> 2016 <br /> Project: Trout Valley Ranch <br /> Project: Baseline Drainage By: B Langenfeld Date: <br /> 09/28/16 <br /> Location: Trout Valley Ranch Checked: <br /> Date: <br /> Present <br /> 1. Runoff Curve Number (CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Pasture Grassland Range (Fair) 49 A 498 .726 <br /> Mined Land, Disturbed (Poor) 87 C 309.288 <br /> CN (weighted) : 63 .5 <br /> Total Area: 808.014 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2 .86 in <br /> Runoff, Q: 0 .3937 in <br /> Runoff Volume: 26.5123 Acre-Ft <br /> Runoff in the active mining area will remain in the disturbed area, as the mining activity will create <br /> a depression that will detain all runoff in the disturbed area. No water rights will be affected and no <br /> water will be detained for more than 72 hours. <br /> The post mine drainage condition is like the mining drainage scenario, with runoff contained in the <br /> area excavated by mining and with detention not to exceed 72 hours. The estimated 6.45 ac-ft of <br /> run off generated by the reclaimed condition will be significantly less than that generated by the <br /> same area prior to mining. This is because the disturbed mining areas of the dredge pile will finally <br /> have been reclaimed. The report below shows the runoff calculations for the reclamation plan. <br /> Trout Valley Ranch November 2016 G-2 Greg Lcwicki and Associates.PIA d' <br />