Hydrology
Hydrological Information
Drought Information - Current and Future
Drought Information - General and Historical
* The Palmer
Drought Index: "The Palmer Drought Index has become
a management tool for decision making in government, industry, and
agriculture. It is used as a standard of comparison by government
for defining drought intensity throughout the United States. ...The
Palmer [Drought] Index is an index of relative moisture deficiency
under a wide range of climatic conditions. Its general concept is
one of supply vs. demand. The supply is represented by precipitation
and stored water in the form of soil moisture, groundwater, lakes,
and reservoirs. The demand is the combination of potential evapotranspiration
and the amount of water needed to recharge soil moisture, plus the
run-off needed to keep lakes, reservoirs, and stream flow at a normal
level. It is a water balance accounting procedure that results in
a positive or negative anomaly estimate weighted by the climatic
conditions in time and space. The final product is an index that
expresses the abnormality for a given place over a particular time
period." (The Encyclopedia of Climatology, edited by
John E. Oliver and Fhodes W. Fairbridge, Van Nostrand Reinhold Company,
New York, 1987, pages 682-683.)
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