Keyword Analysis & Research: aquifer confined or unconfined

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Frequently Asked Questions

What is an unconfined aquifer sometimes called?

Unconfinedaquifers are sometimes also called water tableor phreaticaquifers, because their upper boundary is the water tableor phreatic surface. Typically (but not always) the shallowest aquifer at a given location is unconfined, meaning it does not have a confining layer (an aquitard or aquiclude) between it and the surface.

Why confined aquifers are not recharged by rainfall.?

Confined aquifers have impermeable strata above and below and are not recharged by percolating rainwater. How much water should a well produce per minute? The Federal Housing Administration (FHA) requires 3 to 5 gallons per minute for older wells and a rate of 5 gallons per minute for new wells to pass inspection.

How do confined aquifers recharge?

Confined aquifers may be replenished, or recharged by rain or streamwater infilitrating the rock at some considerable distance away from the confined aquifer. Groundwater in these aquifers can sometimes be thousands of years old. Unconfined Aquifers Where groundwater is in direct contact with the atmosphere through the open pore spaces of the overlying soil or rock, then the aquifer is said to be unconfined. The upper groundwater surface in an unconfined aquifer is called the water table.

Can unconfined aquifers produce artesian wells?

A well that taps an unconfined aquifer above a confined aquifer can dewater the former by gravity drainage and not affect the artesian aquifer if the confining bed between them has negligible permeability. The potentiometric surface is an imaginary surface above the aquifer, to which water from an artesian aquifer would rise in a pipe.

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