water table


water table

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Seasonal variations in groundwater levels.—© Merriam-Webster Inc.

Surface of a body of underground water below which the soil or rocks are permanently saturated with water. The water table separates the groundwater zone (zone of saturation) that lies below it from the zone of aeration that lies above it. The water table fluctuates both with the seasons and from year to year because it is affected by climatic variations and by the amount of precipitation used by vegetation. It also is affected by withdrawing excessive amounts of water from wells or by recharging them artificially. See also aquifer.

Variants of WATER TABLE

water table or groundwater table

This entry comes from Encyclopædia Britannica Concise.
For the full entry on water table, visit Britannica.com.

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