Precipitation-effectiveness index

From Glossary of Meteorology



precipitation-effectiveness index

(Commonly abbreviated P-E index;
also called precipitation– evaporation index) For a given location, a measure of the long-range effectiveness of precipitation in promoting plant growth:
ams2001glos-Pe52
that is, it is equal to 10 times the sum of the monthly precipitation–evaporation ratios (monthly precipitation amounts divided by monthly evaporation amounts).


See moisture index, temperature-efficiency index.


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