'''Rainfall and runoff''' or R factor – USLE is the number of rainfall [[erosion]] index units, plus a factor for runoff from snowmelt or applied water where such runoff is significant.
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[[You can't stop the vandalism, admins!]]
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==References==
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[http://www.nrcs.usda.gov/technical/NRI/1997/summary_report/glossary.html List of USDA terminology] <br>