Artesian aquifer

An artesian aquifer is a confined aquifer containing groundwater under positive pressure. This causes the water level in a well to rise to a point where hydrostatic equilibrium has been reached.

A well drilled into such an aquifer is called an artesian well. If water reaches the ground surface under the natural pressure of the aquifer, the well is called a flowing artesian well.

An aquifer is a geologic layer of porous and permeable material such as sand and gravel, limestone, or sandstone, through which water flows and is stored. An artesian aquifer is confined between impermeable rocks or clay which causes this positive pressure. Not all the aquifers are artesian, because the water table must reach the surface (not the case for underground groundwater such as, for example, the Nubian Sandstone Aquifer System). The recharging of aquifers happens when the water table at its recharge zone is at a higher elevation than the head of the well.

Fossil water aquifers can also be artesian if they are under sufficient pressure from the surrounding rocks. This is similar to how many newly tapped oil wells are pressurized.

Wells

Wells most commonly refers to:

Wells may also refer to:

Places

People

Wells (crater)

Wells Crater is an impact crater in the Eridania quadrangle on Mars at 60.2°S and 237.9°W, and it is 103.0 km in diameter. Its name was approved in 1973 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN), and it was named after H. G. Wells.

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References

Wells (name)

Wells is a surname of English origin, but is occasionally used as a given name too. It derives from occupation, location, and topography. The occupational name (i.e. "Wellman") derives from the person responsible for a village's spring. The locational name (i.e. "Well") derives from the pre-7th century waella ("spring"). The topographical name (i.e. "Attewell") derives from living near a spring. The oldest public record is found in 1177 in the county of Norfolk. Variations of Wells include Well, Welman, Welles, Wellman and Wellsman. At the time of the British Census of 1881 Wells Surname at Forebears, its relative frequency was highest in Berkshire (3.2 times the British average), followed by Leicestershire, Oxfordshire, Kinross-shire, Huntingdonshire, Kent, Sussex, Lincolnshire, Dumfriesshire and Bedfordshire. People with the name include:

Surname

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