aquitard


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Related to aquitard: Aquiclude, aquifuge

aquitard

[′ak·wə‚tärd]
(geology)
A bed of low permeability adjacent to an aquifer; may serve as a storage unit for groundwater, although it does not yield water readily.
References in periodicals archive ?
The aquifer is regarded as the infinite water body, so the boundary between the aquifer and the aquitard can be treated as the constant pressure boundary.
A professor of geology in the department of geological sciences, Hendry said that despite the importance of aquitards, "they are among the most difficult geological features to study and thus the least-understood area in groundwater science.
Since aquitards are restrictive but not completely impermeable, there can be some hydraulic communication between aquifers.
The vertical hydraulic conductivity of aquitards varies in an interval of [10.
Some water mixes between the aquitards and aquifers, and the water in aquitards is generally very old.
3]jr layer can be considered as a regional aquitard which essentially complicates vertical groundwater exchange between the underlying terrigenous Midddle-Upper Devonian aquifer ([D.
The First Canadian Symposium on Aquitard Hydrogeology was held in June 2009 in Saskatoon and was hosted by the University of Saskatchewan's College of Engineering.
Period Group Formation Lithology Aquifer potential Lower Balqa Umm Rijam Chert, Semi aquifer Tertiary (B4) limestone Muwaqqar Chalk, Aquitard (B3) Marl Al Hasa Phosphate Good (B2a) aquifer Amman Silicified Aquifer (B2b) Limestone interrupted Wadi Ghudran Chalk, aquiclude (Bl) Chalky marl Cretaceous Ajlun Wadi As Sir Limestone good aquifer (A7) Shueib Marly Aquitard to badly (A5-6) Limestone developed aquifer Hummar Dolomitic Semi aquifer (A4) Limestone Fuhais Marl Aquitard, partly (A3) semi aquifer Na'ur Marly Semi aquifer (Al-2) Limestone Period Group Thickness (meter) Lower Balqa 70 m Tertiary 60-70 m 60 m 50 m 20 m Cretaceous Ajlun 20 m No outcrop No outcrop No outcrop No outcrop Table 2.
Together with the Ordovician it composes the major basin-scale aquitard.
0 ft), and the deep well was installed immediately above the finer-textured aquitard formed by the Black Creek formation (typically 2.