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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Two hurricanes swamped Tampa Bay flood defenses. What can be done?

Tampa Bay Times 29 Nov 2024
In an ideal world, flood warnings would factor in already saturated soils and high bodies of water, said Thomas Wahl, a civil engineering professor at University of Central Florida ... The elevation, soil saturation and permeability, the existence of pump stations and other stormwater infrastructure all play a role....
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Rising floods and droughts in Sudan leave millions in crisis

The New Arab 26 Nov 2024
Seasonal flooding ... Its unique flat geography and non-porous soil prevent most floodwater from draining into the Nile, provoking prolonged flooding. Grappling with hunger ... Extended drought means the soil becomes drier, harder, and less permeable, which reduces its ability to absorb water, builds up overflow, and exacerbates the risk of flooding ... .......
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5 Tips for a More Sustainable Home Office | Fashion Capital

Fashion Capital 23 Nov 2024
Creating a more sustainable home and workplace benefits the environment while reducing utility bills and enhancing your living / work space ... 1. Choose Energy-Efficient Solutions ... 2. Water Conservation ... When designing your patio, incorporating water-saving elements like permeable pavers can prevent runoff and allow rainwater to replenish the soil ... 3 ... 4 ... 5....
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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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