Soil Erosion Rate Calculator
Estimate average annual soil loss using the RUSLE (Revised Universal Soil Loss Equation) — the USDA NRCS standard model. Enter rainfall erosivity, soil erodibility, slope, cover-management, and conservation practice factors to predict soil loss in t/ha/yr or lb/acre/yr, with a loss-class label.
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Applications of the Soil Erosion Rate Calculator
Useful for agricultural planners sizing cover-crop or tillage programs, civil engineers sizing sediment-control BMPs for construction sites, conservation planners comparing land-use scenarios (forest vs. cropland vs. pasture), watershed managers prioritizing interventions, and homeowners on sloped lots deciding on terracing or mulch.
The RUSLE Formula
A = R × K × LS × C × P. A is the predicted average annual soil loss in tons per hectare per year. R is the rainfall-runoff erosivity factor (MJ·mm/(ha·h·yr)) from a regional erosivity map. K is the soil erodibility factor (t·h/(MJ·mm)) as a function of texture, organic matter, structure, and permeability. LS is the combined slope-length and slope-steepness factor (dimensionless), derived from slope angle and length using the McCool et al. (1987) equation. C is the cover-management factor (dimensionless, 0 = full cover, 1 = bare soil). P is the conservation practice factor (dimensionless, 0 = max practice, 1 = no practice). The calculator also converts to lb/acre/yr (× 892.179) and to mm/yr of topsoil lost using a configurable bulk density (default 1.3 g/cm³ for mineral topsoil).
Fun Fact: The RUSLE replaced the original Universal Soil Loss Equation (USLE) developed by W.H. Wischmeier and D.D. Smith in 1965, which was based on more than 10,000 plot-years of runoff and soil-loss data collected at 49 research stations across the United States — still one of the largest agricultural field-data experiments ever conducted.
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