Aquifers may be shallow or deeper than 100 feet. Confined aquifers are capped by a layer of porous rock, while unconfined aquifers are not. The depth varies depending on the geology of the area and how heavily the aquifer has been used. The Ogallala or High Plains aquifer in the central United States covers 174,000 square miles. It breaches the surface in some spots, and is 500 feet deep in others.
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