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aquifers
An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt).
Groundwater from aquifers can be extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which is a bed of low permeability along an aquifer, and aquiclude (or aquifuge), which is a solid, impermeable area underlying or overlying an aquifer, the pressure of which could create a confined aquifer.
Aquifers can be classified as follows: saturated versus unsaturated; aquifers versus aquitards; confined versus unconfined; isotropic versus anisotropic; porous, karst, or fractured; transboundary aquifer. Challenges for the uses of groundwater from aquifers include: subsidence, saltwater intrusion, salination and groundwater pollution.
If one has been following the trends in the west concerning water, it may be alarming and prompt change in life plans and/or preps. (There is another thread on the topic, but I didn't want to derail someone else's. And this one is to focus on specific preparations, rather general discussion.)...