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i <br /> <br />PROCEDURE FOR COMPUTING SHEET AND RILL EROSION ON PROJECT AREAS <br /> Contents Page <br />Introduction 1 <br />Rainfall Factor (R) 2 <br />Soil-Erodibility Factor (K) 2 <br />Slope Length (L) and Slope Gradient (S) 2 <br />Plant Cover or C ropping Management Factor (C) 8 <br />Factor (C) for Pasture, Range and Idle Land 8 <br />Factor (C) for 1Voodland 8 <br />Factor (C) for Cropland and Hayland 12 <br />Erosion-Control Practice Factor (P) 12 <br />Water Quality and Sediment Yield 12 <br />References 13 <br />Exam~~le of Use of Universal Soil Loss Equation in <br />Watershed Planning 15 <br />Present Conditions 15 <br />Future Conditions 16 <br />Summary of Average Annual Soil Losses 17 <br />Tables <br />Table 1 Slope-Effect Table (Topographic Factor, LS) 6 <br />Table 2 "C" Values for Permanent Pasture, Rangeland, Idle Land, <br />and Grazed Woodland 9 <br />Table S "C" Factors for Undisturbed IVoodland 10 <br />Table 4 "C" Factors for Mechanically Prepared Woodland Sites 11 <br />Figures <br />Fig. 1 Average Annual Values of the Factor, R 3 <br />Fig. 2 Slope-Effect Chart (Topographic Factor, LS) 5 <br />Fig. 3 A Hypothetical 600-Acre Watershed for Use in <br />Example 14 <br />This technical release is based on data developed by Walter H. Wischmeier <br />and his associates in ARS. <br />