An aquifer in which the piezometric surface is above its upper boundary.

Aquifer in which ground water is confined under pressure that is significantly greater than atmospheric pressure. Synonym: Confined Aquifer. See also Unconfined Aquifer.

A confined aquifer in which groundwater rises in a well above the point at which it is naturally found in the aquifer, due to artesian pressure.

An aquifer in which the water level in a well is above the top of the aquifer. The terms "leaky" and "nonleaky" are often used to describe artesian conditions. Leaky refers to the situation in which significant ground-water flow through the aquitard occurs. Nonleaky refers to the circumstances in which flow through the aquitard is insignificant.

an aquifer which is bounded above and below by formations of impermeable or relatively impermeable material

an aquifer whose water is overpressurized

a type of confined aquifer

Synonymous with confined aquifer.

an aquifer under pressure due to confinement between upper and lower impervious strata.

an aquifer that is sandwiched between two layers of impermeable materials and is under great pressure, forcing the water to rise without pumping. Springs often surface from artesian aquifers.

An aquifer that contains water under pressure results in a hydrostatic head which stands above the local water table or above the ground level. For artesian conditions to exist, an aquifer must be overlain by a confining material and receive a supply of water.

an aquifer that contains water under pressure as a result of hydrostatic head. For artesian conditions to exist, an aquifer must be overlain by a confining material and receive a supply of water. The free water surface stands at a higher elevation than the top of the confining layer thus if the aquifer is tapped by a well, the water in the well will raise above the level of the aquifer. List of Glossary Terms

See Aquifer, Confined.

A body of rock or sediment containing groundwater that is under greater than hydrostatic pressure; that is, a confined aquifer. When an artesian aquifer is penetrated by a well, the water level will rise above the top of the aquifer.

See Confined Aquifer.

An aquifer in which ground water is confined under pressure significantly greater than atmospheric pressure. This pressure, called artesian pressure, is generally due to the weight of water at higher levels in the same zone and is sufficient to cause water to rise above the level of the aquifer in a well or natural fissure. An artesian aquifer is bounded above and below by confining beds of less permeable rock. Synonym: confined aquifer.