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TR-61 <br />C (cropping - management) factors are the ratios of soil losses from lands cropped under specified <br />conditions to the corresponding losses from tilled, continuous fallow. C factors for land uses other than <br />cropland are included on Figures 7,8, and 9. The percent ground cover is the primary item to consider <br />because a slight change in the percent ground cover will result in a significant change in the erosion <br />prediction. <br />Figure 7 - "C" Factors for Permanent Pasture and Rangeland <br />ADJACENT AREA - "C" FACTOR <br />RECLAIMED AREA - "C" FACTOR <br />Shadscale Reference Area <br />No appreciable canopy. Canopy is assumed to be the cover contributed by trees and shrubs. Based on the <br />2010 Vegetation Evaluation the combined tree and shrub cover totals 2.7 %. The percent ground cover for <br />the reference area shown above is 44.4 %. Use figure 7 identified above and interpolate to determine the C <br />factor for 44.4% cover. <br />CANOPY NO APPRECIABLE CANOPY <br />PERCENT GROUND COVER <br />40.0% 44.4% 60.0% <br />No G 0.100 0.087 0.042 <br />appreciable Adacent "C" Factor 0.087 <br />canopy <br />Roadside Refuse Disposal Area <br />No appreciable canopy. Canopy is assumed to be the combined cover contributed by trees and shrubs. <br />Based on the 2010 Vegetation Evaluation the combined tree and shrub cover totals 2.8 %. The percent <br />ground cover for the reclaimed area shown on the preceding page is 49.3 %. Use figure 7 identified above and <br />interpolate to determine the C factor for 49.3% cover. <br />CANOPY NO APPRECIABLE CANOPY <br />PERCENT GROUND COVER <br />40.0% 49.3% 60.0% <br />No G 0.100 0.073 0.042 <br />appreciable Adacent "C" Factor 0.073 <br />canopy <br />Roadside Refuse Disposal Borrow Area <br />No appreciable canopy. Canopy is assumed to be the combined cover contributed by trees and shrubs. <br />Based on the 2010 Vegetation Evaluation the combined tree and shrub cover totals 8.4 %. The percent <br />ground cover for the reclaimed area shown on the preceding page is 30.0 %. Use figure 7 identified above <br />and interpolate to determine the C factor for 30.0% cover. <br />CANOPY NO APPRECIABLE CANOPY <br />PERCENT GROUND COVER <br />20.0% 30.0% 40.0% <br />No G 0.200 0.150 0.100 <br />appreciable Adacent "C" Factor - <br />A14 -12 -3 <br />03/11 <br />