Water scarcity occurs when demand for freshwater exceeds supply in a specified domain.This condition arises as a consequence of a high rate of aggregate demand from all water-using sectors compared with available supply, under the prevailing institutional arrangements and infrastructural conditions. It is manifested by partial or no satisfaction of expressing demand, economic competition for water quantity or quality, disputes between users, irreversible depletion of groundwater, and negative impacts on the environment.
Read more on this issue at: http://www.fao.org/docrep/016/i3015e/i3015e.pdf
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