Illinois Water Supply Planning



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Drawdown:
     The difference between the water level in a well before pumping starts (static level) and the water level in a well during pumping, usually measured in feet or meters. Drawdown can be measured in the pumping well itself and in other nearby wells (observation wells). Also, for flowing wells, the reduction of the pressure head as a result of the discharge of water. See also, Interference.

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Illinois State Water Survey

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