syn. decay; depletion 

(1) Continued withdrawal of water from groundwater or a reservoir at a rate greater than the rate of replenishment.

(2) Reduction of groundwater storage in an aquifer or of the flow of a stream or spring caused by discharge exceeding natural replenishment.



UNESCO/WMO International Glossary of Hydrology (2nd revised ed., 1992)

Posted on February 22, 2014 .