# MUSLE

The modified universal soil loss equation (Williams, 1995) is:

       $$sed=11.8\*(Q\_{surf}\*q\_{peak}\*area\_{hru})^{0.56}\*K\_{USLE}\*C\_{USLE}\*P\_{USLE}\*LS\_{USLE}\*CFRG$$

                                                                                                                       4:1.1.1

where $$sed$$ is the sediment yield on a given day (metric tons), $$Q\_{surf}$$ is the surface runoff volume (mm H$$*2$$O/ha), $$q*{peak}$$ is the peak runoff rate (m$$^3$$/s), $$area\_{hru}$$ is the area of the HRU (ha), $$K\_{USLE}$$ is the USLE soil erodibility factor (0.013 metric ton m$$^2$$ hr/(m$$^3$$-metric ton cm)), $$C\_{USLE}$$ is the USLE cover and management factor, $$P\_{USLE}$$ is the USLE support practice factor, $$L\_{USLE}$$ is the USLE topographic factor and $$CFRG$$ is the coarse fragment factor. Surface runoff and peak rate calculations are reviewed in Chapter 2:1. The USLE factors are discussed in the following sections.