drawdown

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drawdown

[′drȯ‚dau̇n]
(graphic arts)
In inkmaking, a procedure for obtaining a rough estimation of a color shade in which a small sample of ink is placed on a piece of paper and spread with a spatula to yield a thin film of ink.
(hydrology)
The magnitude of the change in water surface level in a well, reservoir, or natural body of water resulting from the withdrawal of water.
(petroleum engineering)
The difference between the static and the flowing bottom-hole pressure.

drawdown

The distance by which the groundwater level is lowered as a result of pumping.