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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.

dpipwe.tas.gov.au/.../aquifers/confined-unconfined-aquifers

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.

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 ...

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.

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

A water-table--or unconfined--aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall. Water-table aquifers are usually closer to the Earth's surface than confined aquifers are, and as such are impacted by drought conditions sooner than confined aquifers. Learn more:

www.geographynotes.com/articles/aquifers-types-unconfined-and...

Such types of aquifers are found above the base of confined beds of water level in punctured wells. Water enters confined aquifers from such areas where confined beds come up right up to the surface of the earth or disappear due to geological situations and aquifers become unconfined. The area supplying water to confined aquifers is called ...

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 ...

sciencing.com/difference-between-aquifer-water-table...

Aquifers can be considered unconfined or confined. An unconfined aquifer's bottom is a layer of nonporous rock, which restricts water flow, creating a barrier to the aquifer. The water table is the top layer of the unconfined aquifer. A confined aquifer sits below a unconfined aquifer and layer of nonporous rock.

www.youtube.com/watch?v=HXQt8T1l55I

This video describes the difference between the water table and the potentiometric surface in unconfined and confined aquifers. See part 1 here: