A Runoff Erosivity Factor and Variable Slope Length Exponents for Soil Loss Estimates

ABSTRACT A runoff erosivity term was developed for the Universal Soil-Loss Equation (USLE) from analysis of an erosion equation derived from basic erosion principles. The analysis also suggested how the slope length exponent of the USLE varies with runoff, soil erodibility, slope steepness and length, and erosion control practice. The findings should improve USLE soil-loss estimates for specific events and time periods.