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• <br />Yoast Mine <br />Pond 014 Permanent Feature Demonstration <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> YPM-14 <br /> Watershed ID -Structure 4 - SWS1 <br />Watershed Area: 14.4 <br />Curve Number: <br /> VEGETATION HYDROLOGIC CURVE AREA <br />WATERSHED TYPE COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 14.14 <br />AspenlMountain Brush Fair (30% - 70%) B 48 0.1 <br />Aspen/Mountain Brush Fair (30% - 70%) C 57 0.1 <br /> Total 14.4 <br /> CURVE NUMBER 71 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Baseline <br />Report, Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are presented in <br />Attachment 13-12, Postmining Drainage and Sediment Control, Table 13-12.1. Values were adapted from Urban <br />Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service, 1986. <br /> <br /> YPM-14 <br /> Watershed ID -Structure 4 - SWS1' <br />Sedimentology: k factor <br /> HYDROLOGIC SOIL AREA <br />SOILS MAP UNIT/SOILS SERIES GROUP k FACTOR (acres) <br />Reclaimed B 0.32 14.14 <br />XSDlE/F - Winevada -Splitro complex B 0.37 0.1 <br />46C -Splitro loam C 0.24 0.1 <br />Total 14.4 <br /> Weighted k Factor 0.32 <br />Soils series information from Yoast Mine Permit Application Package (see Tab 9, Sail Baseline Study [Nyenhuis, <br />1994]). Hydrologic Soil Group values are approved Yoast values (see Attachment 13-12, Table 13-12.2). The soil <br />erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2. <br /> YPM-14 <br /> Watershed ID -Structure 4 - SWS1 <br />Sedimentology: Control Factor <br /> CONTROL AREA <br />LAND USE CONDITION COVER TYPE VEGETATION FACTOR (acres) <br />Undistrubed Aspen/Mtn. Brush 25% canopy, 80% 0.042 0.22 <br /> ground cover <br />Reclaimed Reclaimed 60% ground cover 0.042 14.14 <br /> Total 14.4 <br /> Weighted Control Factor 0.042 <br />The.Control Factor values are approved Yoast Mine values as presented in Attachment 13-12, Table 13-12.3. The <br />values were originally presented in Renard, et al. (1997) Predicting Soil Erosion by Water. A Guide to Converation <br />Planning with the Revised Universal Soil Loss Equation (RUBLE), Agricultural Handbook 703, U.S. Department of <br />Agriculture as reported in Warner et al. (1998) as reported in Warner et al. (1998). <br />TR-37 <br />13-17.1-A.16 <br />Revised 02/08 <br />