11/12/2023 0 Comments Atlas supply cos primer![]() ![]() ![]() ![]() (2) Standard unit of pressure representing the pressure exerted by a 29.92-inches (760-mm) column of mercury at sea level at 45 degrees latitude and equal to 14.696 pounds per square inch (psi) or 101.325 kilopascals (An).ĪUGMENTATION PLAN – A court-approved plan that allows a water user to divert water out of priority so long as adequate replacement is made to the affected stream system and water right in quantities and at times so as to prevent injury to the water rights of other users.ĪVAILABLE MOISTURE (OR MOISTURE) – Portion of water in a soil that can be absorbed by plant roots. Artificial recharge can be accomplished via injection wells, spreading basins, or in-stream projects.ĪTMOSPHERE – (1) The gaseous portion of the planet. If the water rises above the surface, it is known as a flowing artesian well.ĪRTIFICIAL RECHARGE – Deliberate act of adding water to a ground-water aquifer by means of a recharge project. Synonym: confined aquifer.ĪRTESIAN WELL or ARTESIAN SPRING – A well or spring that taps ground water under pressure beneath an aquiclude so that water rises (though not necessarily to the surface) without pumping. An artesian aquifer is bounded above and below by confining beds of less permeable rock. ![]() This pressure, called artesian pressure, is generally due to the weight of water at higher levels in the same zone and is sufficient to cause water to rise above the level of the aquifer in a well or natural fissure. See YIELD.ĪQUITARD – A part of a geologic formation (or one or more geologic formations) that is of much lower permeability than an aquifer and will not transmit water at a rate sufficient to feed a spring or for economic extraction by a well.ĪRID – A climate characterized by dryness, variously defined as rainfall insufficient for plant life or for crops without irrigation less than 10 inches of annual rainfall.ĪRTESIAN AQUIFER – An aquifer in which ground water is confined under pressure significantly greater than atmospheric pressure. It comprises two or more permeable beds separated at least locally by confining beds that impede vertical ground-water movement, but do not greatly affect the regional hydraulic continuity of the system includes both saturated and unsaturated parts of permeable materials.ĪQUIFER TEST – A test involving the withdrawal of measured quantities of water from, or addition of water to, a well (or wells) and the measurement of resulting changes in head in the aquifer both during and after the period of discharge or addition.ĪQUIFER YIELD – Maximum rate of withdrawal that can be sustained by an aquifer. Some shales, for example, have such low permeability that they effectively form an aquiclude.ĪQUIFER – A saturated water-bearing formation, or group of formations, which yield water in sufficient quantity to be of consequence as a source of supply.ĪQUIFER SYSTEM – Heterogeneous body of interbedded permeable and poorly permeable material that functions regionally as a water-yielding unit. In times of shortage, junior appropriators are cut off while senior appropriators receive their full allotment.ĪQUICLUDE – An impermeable layer of rock that does not allow water to move through it. Appropriative water rights have a priority based on the date of first usage. Equal to 43,560 cubic feet or 325,851 gallons, or 1,233 cubic meters.ĪDJUDICATION – Judicial process to determine the extent and priority of the rights of persons to use water in a river or aquifer system.ĪLLUVIAL AQUIFER – An aquifer formed by material laid down by physical processes in a stream channel or on a floodplain.ĪLLUVIAL PLAIN – A level, gently sloping, or slightly undulating land surface produced by extensive deposition of alluvium, usually adjacent to a stream that periodically overflows its banks.ĪLLUVIUM – Unconsolidated clay, silt, sand, or gravel deposited during recent geologic time by running water in the bed of a stream or on its floodplain.ĪNALYTICAL MODEL – Model that uses closed-form mathematical solutions to the governing equations applicable, for example, to ground-water flow and transport processes.ĪNISOTROPY – Condition of having different properties in different directions.ĪPPROPRIATION – The right to use water for a beneficial use or the acquisition of such a right gained through the process of diverting water and putting it to a beneficial use.ĪPPROPRIATIVE RIGHTS – Appropriative water rights, generally found in western states, are created by diversion of water and putting it to beneficial use. ACRE-FOOT – The volume of water required to cover one acre to a depth of one foot. ![]()
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