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Definition for

Aquifer

An aquifer is an underground geologic formation containing water that can be tapped through wells or springs. There are two types of aquifers: tributary and non-tributary. A tributary aquifer is hydrologically connected to surface water sources, such as rivers, streams and lakes. Removing water from tributary aquifers depletes the connected surface water sources as well. Non-tributary groundwater is not physically connected to any surface water sources.

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