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<br />• <br />Yoast Nline <br />Pond 012A Design <br />HYDROLOGIC INPtlT PARAIUIETERS <br /> SEDCAD 4 <br /> Channel YPM-19 <br /> Watershed ID -Structure 6 - SWS1 <br />Nlatershed Area: 9.3 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 6.2 <br />AspenlMountain Shrub Good (>70%) B 30 0.7 <br />AspenlMountain Shrub Good (>70%) C 41 0.2 <br />Sagebrush Gocd (>70%) B 35 0.4 <br />ebrush <br />Sa Good (>70%) C 47 1.9 <br />g <br />Total 9.3 <br /> CURVE NUMBER 61 <br /> <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Report, Yoast Study Area {ESCO Associates, 1993). Approved Yoast Mine curve numbers are <br />presented in Attachment 13-12, Postmining Drainage and Sediment Control ,Table 13-12.1. Values were <br />adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service, <br />1986. <br /> SEDCAD 4 <br /> Channel YPM-19 <br /> Watershed ID -Structure 6 - SWS1 <br />Sedimentology: k factor <br />SOILS MAP UNIT/SOILS HYDROLOGIC SOIL AREA <br />SERIES GROUP k FACTOR (acres) <br />Reclaimed B 0.32 6'20 <br />46C/D - Splitro loam C 0.24 2.1 <br />Winevada loam <br />53C/D/E/F B 0.23 1.1 <br />- <br />Total 9.4 <br /> Weighted k Factor 0.29 <br />Soils series information from Yoast Mine Permit Application Package (see Tab 9, Soil Baseline Study <br />[Nyenhuis, 1994]). Hydrologic Soil Group values are approved Yoast values (see Attachment 13-12, Table <br />13-12.2). The soil erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2. <br />• <br />TR-37 <br />13-12.1-71 <br />Revised 02/08 <br />