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www.usgs.gov/faqs/what-difference-between-a-confined-and...

A confined aquifer is an aquifer below the land surface that is saturated with water. Layers of impermeable material are both above and below the aquifer, causing it to be under pressure so that when the aquifer is penetrated by a well, the water will rise above the top of the aquifer.

en.mimi.hu/environment/confined_aquifer.html

CONFINED AQUIFER-Confined is synonymous with artesian. A confined aquifer or an artesian aquifer is an aquifer bounded both below and above by beds of considerably lower permeability than that existing in the aquifer itself.

en.wikipedia.org/wiki/Aquifer

Confined versus unconfined. There are two end members in the spectrum of types of aquifers; confined and unconfined (with semi-confined being in between).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 ...

dpipwe.tas.gov.au/water/groundwater/aquifers/confined...

Confined Aquifers Confined aquifers are permeable rock units that are usually deeper under the ground than unconfined aquifers. They are overlain by relatively impermeable rock or clay that limits groundwater movement into, or out of, the confined aquifer. Groundwater in a confined aquifer is under pressure and will rise up inside a borehole ...

www.thefreedictionary.com/confined+aquifer

Define confined aquifer. confined aquifer synonyms, confined aquifer pronunciation, confined aquifer translation, English dictionary definition of confined aquifer. n. An aquifer that is under pressure because layers of impermeable rock, such as claystone, lie above and below it

techalive.mtu.edu/meec/module04/Basics3.htm

Aquifers come in two types which are shown below: unconfined and confined. Unconfined aquifers are those into which water seeps from the ground surface directly above the aquifer.. Confined aquifers are those in which an impermeable dirt/rock layer exists that prevents water from seeping into the aquifer from the ground surface located directly above.

md.water.usgs.gov/groundwater/web_wells/current/confined/...

Confined Aquifer Wells. Confined aquifers are aquifers that are overlain by a low permeability, confining layer, often made up of clay. The confining layer may offer some protection from surface contamination. The groundwater below the confining layer is under pressure greater than atmospheric and if penetrated with a well, the water level can rise above the top of the aquifer.

www.britannica.com/science/confined-aquifer

A confined aquifer is a water-bearing stratum that is confined or overlain by a rock layer that does not transmit water in any appreciable amount or that is impermeable. There probably are few truly confined aquifers, because tests have shown that the confining strata, or layers ...

sciencing.com/differences-confined-aquifer-unconfined...

Aquifers are bodies of water located underground. They may be enclosed within surrounding rock, which is called a confined aquifer, or exist within a layer of water-saturated gravel or sand, which is called an unconfined aquifer. Both kinds of aquifers are used for irrigation, industrial applications and consumption.

www.usbr.gov/lc/yuma/programs/YAWMS/GROUNDWATER_aquifer.html

The aquifer in the Yuma area is an unconfined aquifer, composed primarily of sand, gravel, clay and silt sediments deposited by the Colorado and Gila rivers. Confining bed A confining bed is a body of distinctly less permeable material that is located above or below one or more aquifers. Confined aquifer A confined aquifer is an aquifer that is ...