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Drawdown may refer to: Drawdown (economics), decline in the value of an investment, below its all-time high. Drawdown (hydrology), a lowering of a reservoir or a change in hydraulic head in an aquifer, typically due to pumping a well.
Freebase(0.00 / 0 votes)Rate this definition: Drawdown. In water-related science and engineering there are two similar but distinct definitions in use for drawdown. âIn 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.