Permeability (earth sciences)

Permeability in fluid mechanics and the earth sciences (commonly symbolized as κ, or k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it.

The permeability of a medium is related to the porosity, but also to the shapes of the pores in the medium and their level of connectedness.

Permeability

Permeability is the property of rocks that is an indication of the ability for fluids (gas or liquid) to flow through rocks. High permeability will allow fluids to move rapidly through rocks. Permeability is affected by the pressure in a rock. The unit of measure is called the darcy, named after Henry Darcy (1803-1858). Sandstones may vary in permeability from less than one to over 50,000 millidarcys (md). Permeabilities are more commonly in the range of tens to hundreds of millidarcies. A rock with 25% porosity and a permeability of 1 md will not yield a significant flow of water. Such “tight” rocks are usually artificially stimulated (fractured or acidized) to create permeability and yield a flow.

Latest News for: Soil permeability

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Vanderburgh County Commission approves $60K contract to mitigate radon at Old Courthouse

Courier & Press - Evansville 20 Nov 2024
Commissioners also opted to have Popham install soil gas mat materials, a semi-permeable hard plastic, along with the vapor barrier to run up the stone foundation walls in a portion of the basement....
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‘We’ve become distrustful of each other’: Braiding Sweetgrass author Robin Wall Kimmerer on Trump, rural America and resistance

The Observer 17 Nov 2024
She inhales and thinks about how she is breathing in the breath of plants ... Because how should you define the self? “If my self is the economic me, supposed to maximise my return on investment, that’s a very different notion than if my self is permeable, if it includes the trees whose oxygen I am breathing, and those birds, and the soil,” she says ... ....
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‘We’ve become distrustful of each other’: Braiding Sweetgrass author Robin Wall Kimmerer on Trump, rural ...

The Guardian 16 Nov 2024
... “If my self is the economic me, supposed to maximise my return on investment, that’s a very different notion than if my self is permeable, if it includes the trees whose oxygen I am breathing, and those birds, and the soil,” she says....
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Red Hill Crisis: Pentagon reports detail poor recordkeeping across Oahu fueling operations

West Hawaii Today 16 Nov 2024
The inside of Upper Tank No. 19 is shown in August at the Red Hill Fuel Storage Facility in Halawa Valley on Oahu. (George F. Lee / Star-Advertiser) ... (Craig T. Kojima/Star-Advertiser) ... Capt ... Lt ... Additionally, based on historical incidents, we concluded that the lower access tunnel floors, soil, and rock below are permeable to liquids, such as fuel.”....
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Phoenix passes $60M shade plan to plant 27,000 trees, replacing goal to shade 25% of city

Azcentral 15 Nov 2024
Completing grant programs to plant trees at schools or in neighborhoods, building permeable pavement or using plants and soil in public rights of way like sidewalks to reduce heat, spending more on "cool corridors," the high-pedestrian areas targeted for shade, building 80 ......
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How nitrate pollution has cut off a quarter of Pratt's water supply

Salina Journal 11 Nov 2024
Much of the region is also sandy, making for especially permeable ground. “Sandy soil means that water percolates through that soil very quickly,” K-State geology professor Matthew Kirk said, “and makes its way down to the water table.” ... Although soil contains microbes that can ......
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Pratt water supply becomes focus of rising nitrates problem

Tri-County Tribune 02 Nov 2024
Much of the region is also sandy, making for especially permeable ground. “Sandy soil means that water percolates through that soil very quickly,” K-State geology professor Matthew Kirk said, “and makes its way down to the water table.” ... Although soil contains microbes that can ......

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