permeability

(redirected from impermeable)
Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.

permeability

The measure of a material's ability to transmit liquids.The passage of soil contaminants into groundwater increases as soil permeability increases.On the other hand,in situ remediation—removal or decomposition—of groundwater contamination is easier as permeability increases.For a color map of the United States showing the relative permeability of soils across the country, see the Web site page of the Environmental Protection Agency at www.epa.gov/iwi/1999sept/iv20_usmap.html.

Mentioned in ?
References in periodicals archive ?
At present waterways ireland uses impermeable clay which is known as puddle clay however this material is a naturally occurring clay which is also known as, but not limited to, marl or leck .
In sparsely populated locales, highways account for the largest proportion of impermeable surfaces, she notes.
In it, 279 patients were randomized to get impermeable mattress, pillow, and blanket covers, or permeable, control covers.
These are figures who do not attempt to achieve an impermeable surface but who become tangled up in touch and motion in obvious pleasure before the camera.
The top layer of impermeable rock will stop the carbon dioxide from escaping and it's possible to store the gas at very high pressures to reduce the storage space, according to Sam Holloway, a geologist from the British Geological Survey.
Although subjects were blinded, slightly more patients in the treatment group discontinued use of the bed covers, possibly because of sweating caused by the impermeable covers.
Additionally, the use of impermeable films, such as the commercially available Marvel Seal, can be custom cut and heat-sealed to make almost completely impermeable containers.
has published a color leaflet summarizing a report on research conducted by Oliver Moghissi at the Southwest Research Institute indicating that non-abrasive, permeable subsea pads improve cathodic protection to submerged steel pipelines that are weighted down with articulating concrete mattresses as compared to impermeable pads.
Comfort Foam from Foam Enterprises is sprayed insulation that forms dosed cells, which means it becomes a nearly impermeable barrier.
An impermeable mulch film could improve the effectiveness of these gases by keeping them in contact with the soil longer.
Test results reveal: 1) maximum water table height and pore-water pressure occur when the sand column is approximately twice the initial water table height, 2) pore-water pressure remains high long after the shaking ceases, apparently due to the elevated water table, 3) with an impermeable layer the pore-water pressure continues to rise as the sand height increases, 4) with an impermeable layer pore-water pressure remains high long after the shaking ceases, apparently due to the lithostatic pressure of the sand column above the impermeable layer, 5 ) sand compaction occurs beneath the water table, and 6) the amount of sand compaction is controlled by initial water table height.
To avoid infiltration of methane gas into the inmate housing units, a protective impermeable plastic film membrane was placed underneath the floor slab of each building.