where SL is the wind erosion modulus (kg/m²); \(Q_{\max}\) is
the maximum sand transport capacity (kg/m); and s is the critical
field length (m), which is the distance at which 63% of the maximum
transport capacity is reached. WF is the weather factor
(kg/m); EF,\(\ K^{{}^{\prime}}\), and SCF are the soil
erodibility factor, the soil crust factor, and the soil roughness
factor, respectively (dimensionless); and COG is the combined
vegetation factor, which is also non-dimensional.
The equations for each factor are