Water table refers to the height or depth of ground water relative to the earth’s surface. In a way, yes all ground water is connected, in the same way that all surface water is connected–there are distinct bodies that do not flow freely to eath other, but that ultimately all reach the same place–the ocean. Ground water is part of the water cycle as well, and also ultimately reaches the ocean and falls again as precipitation. However, local geology separates groundwater pools, so, for example, pumping from an aquifier in the midwest, will not impact the immediate water table outside Boston, MA. Similaraly, pumping from the Colorado River, does not immediately impact the flow of water in the Mississippi, but if you draw the the map big enough you can see the that the Mississippi and the Colorado Rivers are connected–by the ocean.
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