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K Factor, Rock Free — Chaffee -Lake Area, Colorado, Parts of Chaffee and Lake Counties <br />K Factor, Rock Free <br />K Factor, Rock Free— Summary by Map Unit— Chaffee -Lake Area, Colorado, Parts of Chaffee and Lake Counties (C0658) <br />Map unit symbol <br />Map unit name <br />Rating <br />Acres in AOI <br />Percent of AOI <br />LeE <br />Leadville sandy loam, 3 <br />to 35 percent slopes <br />.20 <br />96.8 <br />84.4% <br />MP <br />Mine pits and Dumps <br />11.0 <br />9.6% <br />PgD <br />Pierian gravelly sandy <br />loam, 3 to 9 percent <br />slopes <br />.17 <br />0.8 <br />0.7% <br />W <br />Water <br />6.0 <br />5.3% <br />Totals for Area of Interest <br />114.7 <br />100.0% <br />Description <br />Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by <br />water. Factor K is one of six factors used in the Universal Soil Loss Equation (USLE) <br />and the Revised Universal Soil Loss Equation (RUSLE) to predict the average <br />annual rate of soil loss by sheet and rill erosion in tons per acre per year. The <br />estimates are based primarily on percentage of silt, sand, and organic matter and <br />on soil structure and saturated hydraulic conductivity (Ksat). Values of K range from <br />0.02 to 0.69. Other factors being equal, the higher the value, the more susceptible <br />the soil is to sheet and rill erosion by water. <br />"Erosion factor Kf (rock free)" indicates the erodibility of the fine -earth fraction, or <br />the material less than 2 millimeters in size. <br />Rating Options <br />Aggregation Method: Dominant Condition <br />Component Percent Cutoff., None Specified <br />Tie -break Rule: Higher <br />Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable) <br />Union Mill <br />USDA Natural Resources Web Soil Survey 2/24/2014 <br />2" Conservation Service National Cooperative Soil Survey Page 3 of 3 <br />