aquitard
Noun
Meaning
aquitard (plural aquitards)
(geology) A semipermeable layer along an aquifer.
Examples
An aquitard can sometimes, if completely impermeable, be called an aquiclude or aquifuge.
Related terms include aquitard, which is a bed of low permeability along an aquifer, citation and aquiclude (or aquifuge), which is a solid, impermeable area underlying or overlying an aquifer.
The system shows two aquifers with one aquitard (a confining or impermeable layer) between them, surrounded by the bedrock aquiclude, which is in contact with a gaining stream (typical in humid regions).