what are the differences between the two types of Aquifers?
Consolidated aquifers are the best because there water can reach the surface with any mechanical devices.
What is permeability?
What is not an aquifer?
There are two types of aquifer distinguished on the basis of their geological location in relation to the position of the saturated zone:
Unconfined aquifers crop out at the ground surface. The water table is the top of the saturated zone in an unconfined aquifer, and water normally has to be pumped to the surface except where the water table actually intersects the surface of the ground and forms a spring.
A thin impermeable layer sometimes occurs locally in an aquifer, and this may support a small perched aquifer, separated from the main water table.
Confined aquifers are separated from the ground surface by an impermeable layer and are generally at greater depths than unconfined aquifers.
Pressures in confined aquifers may be sufficient for the water in wells that penetrate the aquifer to discharge naturally at the surface without pumping.
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