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.