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Aquifers of the United States are organized by national principal aquifer codes and names assigned by the National Water Information System (NWIS). Aquifers are identified by a geohydrologic unit code (a three-digit number related to the age of the formation) followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name. [10]
This is an accepted version of this page This is the latest accepted revision, reviewed on 1 February 2025. Water located beneath the ground surface An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the water table (4), and three different wells (7, 8 and 9) dug to reach it. Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in ...
An aquifer in the same geologic unit may be confined in one area and unconfined in another. Unconfined aquifers are sometimes also called water table or phreatic aquifers, because their upper boundary is the water table or phreatic surface (see Biscayne Aquifer). Typically (but not always) the shallowest aquifer at a given location is ...
Aquifers of the United States Withdrawal rates from the Ogallala Aquifer.. This is a list of some aquifers in the United States.. Map of major US aquifers by rock type. An aquifer is a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to groundwater wells and springs.
The following is a partial list of aquifers around the world. A category-based list of aquifers is also available. Africa. Bas Saharan Basin;
A Sole Source Aquifer (SSA) is an aquifer that has been designated by the United States Environmental Protection Agency (EPA) as the sole or principal source of drinking water for an area. [1] By definition, SSA is an aquifer that supplies at least 50% of the drinking water consumed in the area overlying the aquifer.
Principal aquifers of California are those principal aquifers of the United States that lie within (or rather, below) the California state boundaries. Per the Oxford Dictionary of Environment and Conservation , an aquifer is a "body of permeable and/or porous rock that is underlain by impermeable rock and through which groundwater is able to flow."
A Limestone aquifer is an aquifer that is made of carbonate minerals namely marine limestone or bioclastic limestone. Fine-grained limestone has low porosity and permeability while bioclastic limestone is the antithesis. As groundwater may dissolve carbonates aquifer forming an extensive dissolution network which is a karst aquifer. [2]