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• <br />• <br />TABLE 15 <br />VALUES FOR "C" FACTOR <br />Tree Forest <br />Canopyl Lttter2 (C) <br />96 of Area % of Area Undergrowth3 Fa= <br />100-75 100-90 Managed4 .001 <br />Unmanaged4 .003-.011 <br />70-40 85-75 Managed .002-.004 <br />Unmanaged .01-.04 <br />35-20 70-40 Managed .003-.00 <br />Unmanaged .02-.09 <br />'When tree canopy is less than 20%, the area will be considered as . <br />• grassland or cropland for estimating soil loss. <br />ZForest litter is assumed to be at least two inches deep over, the <br />percent ground surface area covered. <br />3Undergrowth is defined as- shrubs, weeds, grasses, .vines, etc., <br />on the surface area not protected by forest litter. Usually <br />found under canopy openings. <br />4Managed--grazing and fires are controlled. <br />Unmanaged--stands that are overgrazed or subjected to re- <br />peated burning. <br />SFor unmanaged woodland with litter cover of less than 75%, (C) <br />values should be derived by taking 0.7 of the appropriate <br />values in Table 15. The factor of 0.7 adjusts for the much <br />higher soil organic matter on permanent woodland.- <br />Source: Soil Conservation Service <br /> <br />-84-