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The water table is an irregular surface that generally resembles a gentler version of the overlying ground surface. It is not
fixed, but moveable, rising when rainfall adds more water to the ground, and falling when drought reduces the water
supply. The depth and shape of the water table can also change dramatically when groundwater is pumped out of the
ground. Pumping can quickly draw down the local water table right around a well. Over time, excessive pumping can also
lower the water table over a wide region.
Info from: http://oceanexplorer.noaa.gov