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LS = ( L )m * (10 si n~ p + 0.027) for S < 8Po <br />72.6 <br />LS = ( L )m * (17.2 sin p-0.55) for S > 8'b <br />72.6 <br />where S is the slope in percent, L is the representative slope length in feet, m is an <br />exponent dependent on slope (m = .3 for S < 3it; m = .4 for S = 4@; m = .5 for Sys <S <10!b; <br />and m = .6 for S> 104,), and 0 is the slope angle. <br />The C and P Factors. The C factor, the cover and management factor, is the ratio of soil <br />loss from an area with specified cover and management to that from an identical area in <br />tilled continuous fallow. The P factor, the support practice factor, is the ratio of soil <br />loss with a support practice like contouring, strip cropping, or terracing to that with <br />straight-row farming up and down the slope. The C factor was determined based on the <br />vegetation description in Tab 10 and with the aid of the USDA-ARS revised USLE software <br />program for each cover type within the overall drainage area. The P factor is based on <br />current or future practice. Table 3 contains the typical C and P factors utilized for the <br />Seneca II-W Mine area. <br />TABLE 3 <br />C and P Factors (Native/Reclaimed) <br />Seneca II-W Mine, Colorado <br />A Aspen <br />B Mixed Brush <br />S Sagebrush <br />WW Western wheatgrass/alkali sage <br />SMB Steep Mtn. Brush <br />MD/M Mesic Drainage/Meadows <br />Disturbance <br />Topsoil stripped/pit advance <br />Graded spoil/spoil areas <br />Area graded, topsoiled, seeded on contour <br />Year 1 - reclaimed, veg. establishing <br />Year 3 - reclaimed, veg. established <br />Year 5 - reclaimed, veg. at potential <br />13-1-8 <br />C P <br />001 1 <br />003 1 <br />003 1 <br />006 1 <br />006 1 <br />001 1 <br />.6 1 <br />.5 1 <br />.6 .85 <br />.18 1 <br />.OS 1 <br />.003 1 <br /> <br />• <br /> <br /> <br />