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The statistical measure of goodness of fit between measured and WEPP simulated runoff rate for the three different cover and soil conditions is presented in Table 1. It was observed that both EI and R2 values were high for the bare condition for all three soils. EI values for three vegetated cases were negative indicating the mean observed was a better estimate of the simulated results.

Table 1

Statistical analysis of simulated and observed runoff

Surface conditionSoil typeNash–Sutcliffe EIR2
Bare Catlin 0.93 0.65 
Vegetated (Brome) Catlin 0.86 0.41 
Vegetated (Fescue) Catlin 0.65 0.81 
Bare Darwin 0.64 0.78 
Vegetated (Brome) Darwin 0.71 0.83 
Vegetated (Fescue) Darwin −4.27 0.72 
Bare Alvin 0.56 0.62 
Vegetated (Brome) Alvin −0.63 0.37 
Vegetated (Fescue) Alvin −0.12 0.48 
Surface conditionSoil typeNash–Sutcliffe EIR2
Bare Catlin 0.93 0.65 
Vegetated (Brome) Catlin 0.86 0.41 
Vegetated (Fescue) Catlin 0.65 0.81 
Bare Darwin 0.64 0.78 
Vegetated (Brome) Darwin 0.71 0.83 
Vegetated (Fescue) Darwin −4.27 0.72 
Bare Alvin 0.56 0.62 
Vegetated (Brome) Alvin −0.63 0.37 
Vegetated (Fescue) Alvin −0.12 0.48 

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