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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.
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 ...
The Kankakee Aquifer is the yellowish patch to the west. The light blue area is the St. Joseph Aquifer System, which serves much of the northeast part of the county. To see the map up close and ...
The sharp contact between the vadose zone (brown oxidized mudstone) and the underlying phreatic zone (grey unoxidized mudstone) exposed at a construction site.. The vadose zone is the undersaturated portion of the subsurface that lies above the groundwater table.
The water drains relied on gravity, with the destination lower than the source, which is typically an upland aquifer. allows water to be transported long distances in hot dry climates without losing a large proportion of the source water to seepage and evaporation.
The following is a partial list of aquifers around the world. A category-based list of aquifers is also available. Africa. Bas Saharan Basin;
Hence the actual amount of water that can be extracted from the unit volume of aquifer by pumping or under the action of gravity is called as specific yield. The fraction of water held back in the aquifer is known as specific retention. Thus it can be said that porosity is the sum of specific yield and specific retention.