Perched Aquifer: An aquifer containing unconfined (unpressurized) groundwater held above a lower body of groundwater by an unsaturated zone; often a result of clay lenses in the soil strata. DIAGRAM ...
Perched aquifer: Localized zone of saturation above the main water table created by an underlying layer of impermeable material.
Perched Aquifer: A special case of unconfined aquifer which occurs wherever an impervious (or semipervious) layer of limited areal extent is located between the regional water table of an unconfined aquifer and the ground surface.
 See also: Precipitation, Concentration, Water, Confined aquifer, Contaminant
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