confined aquifer

Contaminated groundwater is located in a confined aquifer system.

This concept is important for specific storage, when estimating groundwater reserves in confined aquifers.

Using ground water from deep, confined aquifers provides more protection from surface water contamination.

Other aquifers that are enclosed beneath this are called confined aquifers.

When water flows out from an artesian well in a confined aquifer, none of the pore space drains completely.

Groundwater in a confined aquifer is compressed elastically, rather like air in a tyre.

In the same way, the pressure of the groundwater in a confined aquifer helps to support the overlying rock layers.

An artesian aquifer is a confined aquifer containing groundwater under positive pressure.

These alluvial fans exhibit some characteristics of a confined aquifer, but also respond to recharge from precipitation.

If the impermeable area overlies the aquifer pressure could cause it to become a confined aquifer.

In confined aquifers (artesian), the cone of depression is a reduction in the pressure head surrounding the pumped well.

If a confined aquifer follows a downward grade from its recharge zone, groundwater can become pressurized as it flows.

Confined aquifers often lie below unconfined aquifers and have a layer of rock or other materials as their upper boundaries.

Cannot be used for treatment of confined aquifers Stratified soils may cause air sparging to be ineffective.

Ground water can remain in a water table aquifer for several decades and in confined aquifers for centuries or longer.

The relatively impermeable clay layers trap ground water in the "confined aquifer" which, if tapped, supplies artesian wells.

Storativity is the vertically integrated specific storage value for a confined aquifer or aquitard.

It excludes water that will not drain from small pore spaces, saline water, and water in deep confined aquifers.

In a confined aquifer, the upper surface of water is overlain by a layer of impervious rock, so the groundwater is stored under pressure.

It also recharges the deeper confined aquifers in the area, the Leederville and Yarragadee Aquifers.

In a confined aquifer under artesian conditions, the water level in the piezometer indicates the pressure in the aquifer, but not necessarily the water table.

The Great Artesian Basin in central and eastern Australia is one of the largest confined aquifer systems in the world, extending for almost 2 million km.

The governing partial differential equation for a confined aquifer used in MODFLOW is:

If you drill a borehole into a confined aquifer, water will rise up the borehole until the column of water is enough to balance the pressure in the aquifer.

Storativity is a dimensionless quantity, and ranges between 0 and the effective porosity of the aquifer; although for confined aquifers, this number is usually much less than 0.01.