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aquifer
1. A formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant ...
aquifer stimulation
A type of development that is done in semiconsolidated and completely consolidated formations to alter the formation physically to improve ...
aquifer storage
Gas storage in an aquifer [16].
aquifer system
A body of permeable and poorly permeable material that functions regionally as a water-yielding unit; it comprises two or more ...
aquifer test
A test to determine hydrologic properties of the aquifer involving the withdrawal of measured quantities of water from or addition ...
aquifer, artesian
A confined aquifer where the potentiometric surface rises above the top of the aquifer bed [16].
aquifer, coastal
An aquifer in a coastal region open to salt-water intrusions [16].
aquifer, flowing artesian
An artesian aquifer in which the water, under hydrostatic pressure rises above the land surface.
aquifer, karst
An aquifer in which the flow of water is or can be appreciable through one or more of the following: ...
aquifer, leaky
An aquifer overlain or underlain by semipermeable strata from or into which water will flow [16].
aquifere epikarstique
See epikarst zone.
aquifuge
A formation which has no interconnected openings or interstices and therefore neither stores nor transmits water [22]. See also confining ...
aquitard
A confining bed that retards but does not prevent the flow of water to or from an adjacent aquifer; a ...
aragonite
1. A relatively rare form of calcium carbonate (CaCO3), chemically identical to the more common calcite but of orthorhombic crystal ...
ardealite
A cave mineral - Ca2(SO4)(HPO4).4H2O [11].
area of influence of a well
The area surrounding a pumping or recharging well within which the potentiometric surface has been changed [22].
arete and pinnacle karst
A landscape of naked reticulated raw-topped ridges having almost vertical slopes and a relief of as much as 120 meters. ...
argillaceous
The property of rocks containing clay in non-negligible proportions [16].
argillaceous limestone
Limestone containing considerable amounts of clay [16].
arid
The property of dry climates and regions with a net deficiency of moisture [16].
arrival time
1. The time of arrival in subsurface flow tracing for the first tracer pulse to arrive at a discharge location. ...
artefact
A product of human manufacture or art, e.g. tools of bone, stone, etc., paintings, engravings. In caves, tools are often ...
artesian
Synonymous with confined.
artesian aquifer
Synonymous with confined aquifer. See aquifer, artesian.
artesian flow
Flow through a confined aquifer where the elevation of the overlying aquiclude is locally depressed so that the entire aquifer ...
artesian spring
See spring, artesian.
artesian well
A well deriving its water from a confined aquifer in which the water level stands above the ground surface [6]. ...
arthropods
Animals with jointed legs and bard external skeletons (exoskeletons). The group includes insects, crustaceans, spiders, millipedes, and several other types ...
artificial discharge
The discharge of ground water by pumping wells [16].
artificial recharge
Recharge at a rate greater than natural, resulting from deliberate or incidental human activities [6].