EffectsĪquifer drawdown or overdrafting and the pumping of fossil water may be a contributing factor to sea-level rise. 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 an initial time at the same location.Ī record of hydraulic head through time is more generally called a hydrograph (in both groundwater and surface water). In surface water hydrology and civil engineering, drawdown refers to the lowering of the water level in a man-made reservoir or tank. drawdown noun (also draw-down) uk / drdan / us C or U FINANCE a situation in which someone takes an amount of money that has been made available: a drawdown facility/plan/scheme The income drawdown plan allows you to keep your fund invested after retirement while you draw an annual income from it.In subsurface hydrogeology, drawdown is the change 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.Synonyms and related words Definition and synonyms of draw down from the online English dictionary from Macmillan Education. In water-related science and engineering there are two similar but distinct definitions in use for drawdown. draw down Definitions and Synonyms phrasal verb transitive business Word Forms DEFINITIONS 1 1 to reduce an amount of money by using it Some firms have dealt with the problem by drawing down their cash reserves. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Wars, battles and military manoeuvres war. This article needs additional citations for verification. the removal of some soldiers from an area where there has been fighting.
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