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drawdown

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cone of depression

Overview page. Subjects: Environmental Science.

A cone‐shaped depression in the surface of a water table, in the vicinity of a well, that is caused by pumping. See also draw down.

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well-point drainage

Overview page. Subjects: Earth Sciences and Geography.

A method for draining permeable deposits around an excavation that requires small cones of depression. Tubes about 100 mm in diameter, with wire mesh screens, are sunk into the ground and...

See overview in Oxford Index

yield–depression curve

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

A graph on which the drawdown is plotted against the yield of a pumped well or borehole. The resulting plot is invariably curved, and is used to determine the optimum pumping rate for a...

See overview in Oxford Index