Drought There is no universally accepted quantitative definition of drought. Generally, the term is applied to periods of less than average or normal precipitation over a certain period of time sufficiently prolonged to cause a serious hydrological imbalance resulting in biological losses (impact flora and fauna ecosystems) and/or economic losses (affecting man). In a less precise sense, it can also signify nature’s failure to fulfill the water wants and needs of man. The following are three broad categories of drought: 1 Meteorological Drought – Such a drought is considered to occur when annual rainfall (or precipitation) is less than the long-term average annual rainfall, 2 Hydrological Drought – The onset of such a drought is signified by the occurrence and/or persistence of meteorological drought causing shortage of surface water in streams, lakes, reservoirs and/or groundwater supplies, 3 Agricultural Drought – This type of drought occurs when soil moisture availability to agricultural crops is reduced to a level causing adverse effects on grain yield and consequently, the agricultural production of a region.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
Web site to visit: http://www.state.nv.us/cnr/ndwp/home.htm
Author of the Water Words Dictionary source of text: Gary A. Horton
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