Drawdown (hydrology)
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In water-related science and engineering there are two similar but distinct definitions in use for drawdown.
- In subsurface hydrogeology, drawdown is the reduction in hydraulic head observed at a well in an aquifer, typically due to pumping a well as part of an aquifer test or well test.
- In surface water hydrology and civil engineering, drawdown refers to the lowering of the water level in a man-made reservoir or tank.
In either case, drawdown is the change in head or water level relative to background condition, indicating the difference in head which has occurred at a given location relative to an initial time at the same location.
A record of hydraulic head through time is more generally called a hydrograph (in both groundwater and surface water).
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Effects
Aquifer drawdown or overdrafting and the pumping of fossil water may be a contributing factor to sea-level rise.
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Related
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Drawdown (hydrology)" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
