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9 <br />~„t~ram;aily affect the rate of erosion by water on a site. Trrlividual LS- <br />values must be determined for each point to calculate an average LS-value. Slope <br />length and steepness crannot be averaged prior to calculating the LS-value. <br />Zhe slope lesx~th factor {L) is defined as: <br />whew: sl = field slope length in feet <br />and m = exponent rarrgirg from 0.3 to 0.6 d~e1rL*+~ upon slope length- <br />gradient interaction. 'IIve average value, 0.5, is used in mast <br />other situations. <br />'Ihe slope gradient factor (S) is defined as the ratio of soil loss from <br />slope(s) to the ~'-- ~u slope (9$). <br />S = 0.43 + 0.30s + 0.04352 <br />6.613 <br />where S =slope gradient. in percent. <br />Cover Factor lCi <br />~e cropping marv~+anw.,r (or cover) factor (C) adjusts the estimated surface <br />r soil lasses to aooo~art for the affects of vegetation, residues, soil surface, and <br />management factors. For agricultural craps the C factors have been dorcr,n; ,,ort <br />experimentally. For pasture lards, range lands and woodlands, a procedure for <br />evaluating the effects of gtvurd cover, canopy height, mulch (or litter), aryl <br />root density, has been developed (Wisclmieier, 1975). <br />'Rie cover factor, C, is needed to aooo~n~t for plants and other material <br />which protect the soil frffi raindrop impact and runoff. ~'1;C 15 the only factor <br />in the LISLE which is easily altered by the kinds and intensities of activities on <br />mining lards. During site evaluation campy weer (and groiud over) data are <br />