impermeable layer

This impermeable layer stops the water from moving freely up and down.

The sheets were joined together and folded into impermeable layers.

This impermeable layer prevents the seed from taking up water or gases.

The impermeable layer prevents infiltration of wastes down into lower aquifers.

Fluids will flow upward (toward lower pressure) until they reach an impermeable layer (seal).

Capping - placement of an impermeable layer over a landfill to prevent water entering.

Instead, an impermeable layer of dark crust, scaly as an alligator's hide, still covered the table.

A seal is an impermeable layer of rock that stops the migration of fluids.

Below the impermeable layer, water is trapped in the aquifer, which is said to be confined.

Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay.

• Tailings can be covered with impermeable layers.

These caps are usually made of several layers of material including one or more impermeable layers.

A protective layer that protects the impermeable layer and supports vegetation.

Other factors, such as ground water level or the presence of an impermeable layer that restricts drainage, also determine soil moisture.

Covering the entire area with an impermeable layer about 1 m thick, e.g., of loess.

All that plaster forms an impermeable layer on the water's bottom so that organisms can't breathe."

This means the location requires an impermeable layer, such as mud or clay, above the area where the CO2 is being pumped.

This trap is formed by the movement of permeable and impermeable layers of rock along a fault line.

An underground aquifer on an impermeable layer of shale sustains a spring in this otherwise very dry area.

Some parts of the system are considered to be confined, if not somewhat leaky, due to impermeable layers such as marine shales.

The precipitated matter eventually forms an impermeable layer, preventing water from percolating to the watertable.

The potential for the impermeable layer to remain nearly fully saturated, even under an evaporative flux, is demonstrated by flow modelling.

This state is only quasi-stable, since in periods of low rainfall the water table drops below the level of the impermeable layer.

Also, pumping so much water into porous rock confined between impermeable layers could, in theory, crack the ceiling or floor, some geologists have said.

Depth to impermeable layer Availability (ease of installation)