Spearman's correlation coefficients were significant only for sidewall
and channel morphological settings (Table 3), while erosion measures
for the interfluves were not correlated with precipitation. For
the sidewall and channel areas, precipitation parameters significantly
correlated with erosion were included as independent variables in stepwise
linear regression models of erosion in gully sidewalls and channels.
Because of high correlation between precipitation accumulation and
precipitation duration, only one of these variables was included in any
given model to avoid collinearity. There was no significant correlation
between precipitation accumulation in one period and the prior period,
and so both antecedent precipitation and precipitation accumulation
were included.