Impermeable layer: A layer of material (such as clay) in an aquifer through which water does not pass.
The impermeable layers in an aquifer.
Consent Decree
A legal document, approved by a judge, ...
The upper surface of the zone of saturation of groundwater above an impermeable layer of soil or rock (through which water cannot move) as in an unconfined aquifer. This level can be very near the surface of the ground or far below it.
Water Table The level of ground water or the upper surface of the zone of saturation of groundwater above an impermeable layer of soil or rock (through which water cannot move) as in an unconfined aquifer.
A water table due to the ""perching"" of water on a relatively impermeable layer at some depth within the soil. The soil within or below the impermeable layer is not saturated with water.
percolation (of soil water) ...
 See also: Permeable, Water table, Table, Impermeable, Soil
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