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If such a confined aquifer is tapped by a well, water will rise above the top of the aquifer and may even flow from the well onto the land surface. Water confined in this way is said to be under artesian pressure, and the aquifer is called an artesian aquifer.
GOUNDWATER BASICS-Aquifer. An aquifer is a geologic formation, group of formations, or part of a formation which contains sufficient saturated, permeable material to yield significant quantities of water to wells and springs. There are generally two kinds of aquifers: confined and unconfined.Unconfined aquifer. An unconfined aquifer, also called a water-table aquifer, is an aquifer which has the water table as its upper boundary. Unconfined aquifers occur near the ground surface. 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 bounded above and below by confining beds.