Groundwater by Lara Fabrizi
Groundwater is often contained in aquifers: an aquifer is an underground water saturated stratum of formation that can yield usable amounts of water to a well. There are two different types of aquifers based on physical characteristics: if the saturated zone is sandwiched between layers of impermeable material and the Groundwater is unfed pressure, it is called a confined aquifer; if there is no impermeable layer immediately above the saturated zone, it is called an unconfined aquifer. In an unconfined aquifer the top of the saturated zone is the water table as defined above. Usually an aquifer can produce an economically feasible quantity of water to a well or spring. A saturated region that, due to lower hydraulic conductivity, does not yield a sustainable amount of water in an economic fashion is called aquitard.
For terminology on water please check our Water Glossary
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