Perched water definition

Perched water means a localized body of groundwater that overlies, and is hydraulically separated from, an underlying body of groundwater.
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Perched water means water that accumulates above an aquitard that limits downward migration where there is an unsaturated interval below it, between the aquitard and the zone of saturation.
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Perched water means subsurface water that occurs beneath the ground within the zone of aeration wherein the subsurface water has encountered a restrictive impervious stratum typically separating it from the main water table or groundwater source.
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Examples of Perched water in a sentence

  • Perched water table: the upper limit of a zone of saturation that is perched on an unsaturated zone by an impermeable layer, hence separating it from the main body of ground water (the saturated zone).

  • Perched water tables are not considered for the purposes of this unit.

  • Perched water should be adequately characterized and dedicated monitoring wells for perched water may be appropriate.

  • Perched water may be a significant barrier to downward migration of oil, and may represent the most likely horizontal pathway, and storage area for discharged oil.

  • Perched water can occur in areas where low-permeability rocks impede the downward movement of ground water sufficiently to allow a saturated water body to develop over unsaturated rocks (fig.

  • Perched water bodies can supply usable quantities of water to springs or wells.

  • Perched water is found in areas where low-permeability rocks impede the downward movement of ground water sufficiently to allow a perched water body to develop.

  • Perched water levels were measured at 16-foot and 22.5-foot depth (Table 3.1).

  • Perched water was encountered in boring B-3 at a depth of 10 feet.

  • Perched water could be encountered at higher elevations during construction, particularly in areas where silty sands or clayey sands underlain by low permeability soil.


More Definitions of Perched water

Perched water means water in a local zone of saturation held above the main body of groundwater by a relatively impermeable stratum. (Water in this zone is generally unpotable.)
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Perched water means a localized body of groundwater that overlies, and is
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Perched water means a localized body of groundwater that overlies, and is hydraulically sepa- rated from, an underlying body of groundwater.
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Perched water means water that has become separated from the main ground water source by an impermeable layer of stratum and is capable of being recharged.
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Perched water or “Perched Water Table” means a subsurface, discontinuous saturated lense with
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Related to Perched water

  • Finished water means the water that is introduced into the distribution system of a public water system and is intended for distribution and consumption without further treatment, except as treatment necessary to maintain water quality in the distribution system (e.g., booster disinfection, addition of corrosion control chemicals).

  • Bottled water means water that is placed in a safety sealed container or package for

  • Produced water means water extracted from the earth from an oil or natural gas production well, or that is separated from oil or natural gas after extraction.

  • Used water means any water supplied by a public water supply system to a consumer's water system after it has passed through the service connection and is no longer under the control of the water supply official custodian.

  • Potable water means water that is fit for human consumption;

  • Unpolluted water means water of quality equal to or better than the effluent criteria in effect or water that would not cause violation of receiving water quality standards and would not be benefited by discharge to the sanitary sewers and wastewater treatment facilities provided.

  • Recycled water or “reclaimed water” means treated or recycled waste water of a quality suitable for non-potable uses such as landscape irrigation and water features. This water is not intended for human consumption.

  • Ground water means water below the land surface in a zone of saturation.

  • Potable means water suitable for drinking by the public.

  • Surface water means all water which is open to the atmosphere and subject to surface runoff.

  • Surface waters means all waters of the state as defined in G.S. 143-212 except underground waters

  • CO2 means carbon dioxide.

  • Blendstock means and includes any petroleum product component of motor fuel, such as naphtha, reformate, or toluene; or any oxygenate that can be blended for use in a motor fuel.

  • Fresh water means water, such as tap water, that has not been previously used in a process operation or, if the water has been recycled from a process operation, it has been treated and meets the effluent guidelines for chromium wastewater.

  • Feedstock Gas means natural gas used as a raw material for its chemical properties in creating an end product.

  • Non-potable water means water not safe for drinking, personal, or culinary use as determined by the requirements of 35 Ill. Adm. Code 604.

  • Hot water means water at a temperature of 110°F. (43°C.) or higher.

  • Tank means an enclosed space which is formed by the permanent structure of a ship and which is designed for the carriage of liquid in bulk.

  • Pressurized gas duster means a pressurized product labeled to remove dust from a surface solely by means of mass air or gas flow, including surfaces such as photographs, photographic film negatives, computer keyboards, and other types of surfaces that cannot be cleaned with solvents. “Pressurized Gas Duster” does not include “Dusting Aid.”

  • Cubic foot of gas means the amount of gas required to fill a cubic foot of space when the gas is at an absolute pressure of fourteen and seventy-three hundredths (14.73) pounds per square inch at a temperature of sixty (60) degrees Fahrenheit.

  • Ash means all species of the genus Fraxinus.

  • Navigable waters ’ means the waters of the United States, including the territorial sea;

  • Receipt Point(s means the receipt points set forth in Section 6 of this Toll Schedule.

  • licensed water supplier means a company which is the holder for the time being of a water supply licence under Section 17A(1) of the 1991 Act(f);

  • Plasma arc incinerator means any enclosed device using a high intensity electrical discharge or arc as a source of heat followed by an afterburner using controlled flame combustion and which is not listed as an industrial furnace.

  • Bulk gasoline plant means a gasoline storage and distribution facility with an average daily throughput of 20,000 gallons (76,000 liters) of gasoline or less on a 30-day rolling average.