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<br />f 1 <br />~~ <br /> <br />Yoast Mine <br />Pond O'12A Design <br />HYDROLOGIC I~1PUT PARAMETERS <br />°'~ SEDCAD 4 <br /> Channel YPM-6-1 ` <br /> Watarshed ID -Structure 7 - SWS1 <br />West side subwatershed <br />~tershed Area: 8.2 <br />rve Number: <br />HYDROLOGIC <br />CURVE ARE/ <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acre: <br /> B 71 1.54 <br />Reclaimed Fair (30% - 70%) 30 2.13 <br />Aspen/Mountain Shrub Good (>70% <br />) B 4 <br />56 <br /> % C 41 . <br />Aspen/Mountain Shrub ) <br />Good (>70 8.23 <br />Total <br />~~ iovC A11 IM1ARFR <br />44 <br />Vegetation cover ccnditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Baseline Report, <br />Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are presented in Attachment 13-12, <br />Postmining Drainage and Sediment Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Smolt <br />Watersheds, Technical Release No. 55, Soil Conservation Service, 1986. <br />SEDCAD 4 <br />Channel YRM-6-1 <br />Watershed ID -Structure 7 - SWS1 <br />iimentology: k factor <br />SOILS MAP UNIT/SOILS SERIES <br />Maimed <br />~/E/F -Winevada -Splitro complex <br />~/D -Splitro loam <br />~1D/E/F -Winevada loam <br />Total <br />GROUP k FACTOR ~'~'~' <br />B 0.32 1.54 <br />B 0.37 0.8 <br />C 0.24 2.1 <br /> 0.23 3.7 <br />B 8.2 <br />k Factor 0.26 <br />• <br />TR-37 <br />13-12.1-73 <br />Revised 02/08 <br />