The basic statistics of erosivity zones are summarized in Table 3. The coefficient of variation of each zone exhibited an insignificant temporal variability in the 1988–2013 period. The max and min value of averaged annual erosivity occurred at Zone I and Zone II, respectively. Moreover, those two zones have more meteorological stations than others, which might guarantee a more satisfactory explanation for erosivity characteristic. Thus, Zone I and Zone II, were selected for the next step study.