Discussion
None of the following distinguishes a confined from an unconfined aquifer except
Answer: A
Correct answer: the presence of an overlying bed of much lower permeability
Confinement is defined by what lies above the aquifer, not by the aquifer itself. The same sand may be unconfined where it outcrops and confined where a clay covers it downdip. Porosity, grain size and the depth of the wells drilled into it are all properties of the aquifer or of how it is exploited, and none of them determines whether it is confined.
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