III is the underlying aquifer adjacent to the pumped layer.
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.
Both superimposed and partially disjointed aquifer assemblages are separated by aquitards
, sealing marlstones, leading to substantial differences in their groundwater chemistry.
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."
The Middle Aquifer, where present, is confined by the upper aquitard
, a clay-silt layer.
have very slow permeability whereas aquicludes are essentially impermeable.
The designation of a stratum as an aquifer or aquitard
is relative to its neighboring strata.
These aquifer systems are separated by the Lukati-Lontova aquitard
Ground water tends to flow through aquifers constrained by layers of less-permeable rock called aquitards
. Hydrologists believe a ground water's age reflects the time it takes to migrate along the aquifer.
The [D.sub.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.sub.3-2]sv-up).
The Second Canadian Symposium on Aquitard
Hydrogeology was held this past June at the University of Ottawa, Ontario, and brought together over 120 geoscientists from Hong Kong to Bern and from Mississippi to Saskatoon.
Weaver TR, Cherry JA, Frape SK (1996) Hydrodynamic response of a clay-till aquitard
to changing potentiometric conditions in an underlying water-supply aquifer: implications for solute and contaminant transport.