Low permeability definition

Low permeability means a soil layer of well-sorted, fine grain-sized sediments or of rock that under normal hydrostatic pressures would not be significantly permeable. Low permeability soils may include homogeneous clays below the zone of weathering, mudstone, claystone, shale, and some glacial till.
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Low permeability means a permeability of less than two tenths of one inch per hour.
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Low permeability means hydraulic conductivity of ≤1 x 10-9 metres per second or equivalent;
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Examples of Low permeability in a sentence

  • Low permeability strata trap methane in features such as stratigraphic reservoirs, anticlines, and faults.

  • Low permeability areas can have high residual contaminant concentrations while vapor extraction off-gases indicate cleanup is complete.

  • Low permeability backfill may include a low strength grout mix known as controlled density fill (“CDF”), or “flowable fill”.

  • Low permeability subsoil in loess limits downward water movement, and sideways flow through topsoil contributes to runoff generation at low points in fields.

  • Low permeability layers under buildings (either natural or as part of construction) may act as an impediment to significant vertical vapor migration from the groundwater contamination.

  • Low permeability layers, either natural or as part of the building’s construction may restrict migration of vapors from a ground water contamination source and result in relatively clean SSSG samples even though the underlying ground water is contaminated.

  • Low permeability tends to maximize the fluid pressures in the system during heating.

  • Low permeability layers such as silts and clays have smaller pore sizes and do not transmit gas vapors as readily.

  • Low permeability results in water, nutrients, and fine sediment washing off of the surface into streams during storm events.

  • Low permeability layer in a soil core from F.E. Warren AFB F.E. Warren AFB Spill Site 7 Water quality response in a plume downgradient of an iron permeable reactive barrier (PRB),F.E. Warren AFB, Wyoming (AFCEE, 2007) Another example is a chlorinated ethene release site at Kings Bay, Georgia (Chapelle et al., 2004).


More Definitions of Low permeability

Low permeability means a surface with permeability of 2 x 10-10 metres/second or less;
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Related to Low permeability

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  • Construction permit is defined in Section 4.

  • Materials of Environmental Concern any gasoline or petroleum (including crude oil or any fraction thereof) or petroleum products or any hazardous or toxic substances, materials or wastes, defined or regulated as such in or under any Environmental Law, including asbestos, polychlorinated biphenyls and urea-formaldehyde insulation.

  • Energy conservation measure means a training program or facility alteration designed to reduce energy consumption or operating costs and includes:

  • Sustainability means the use, development, and protection of resources at a rate and in a manner that enables people to meet their current needs while allowing future generations to meet their own needs; “sustainability” requires simultaneously meeting environmental, economic and community needs.

  • Sustainability Risk means an environmental, social or governance event or condition that, if it occurs, could cause an actual or a potential material negative impact on the value of the investment;

  • Species means any group of animals classified as a species or subspecies as commonly accepted by the scientific community.

  • Pretreatment requirements means any substantive or procedural requirement related to pretreatment, other than a pretreatment standard, imposed on an industrial user.

  • Native vegetation means plant species that are indigenous to the region.