Ground water can be pumped out of the ground using a pump at the bottom of a well. The well must penetrate beyond the groundwater table typically into an aquifer, an aquifer is a large underground body of water. However in the case of a confined aquifer, an artesian well can be formed. In the case of an artesian well, the hydralic pressure of the water in the confined aquifer gives the water enough pressure to flow freely out of the aquifer to the crust with no need for the use of a pump. (also known as a spring)
Naturally, ground water can come out on its own as spring. Some come out and become stagnant forming ponda and pools. Humans also bore holes to get at underground water.
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