an underground bed or layer yielding ground water for wells and springs etc.; as, the Oglala aquifer. The water contained in an aquifer may be of great age, and in such cases is sometimes called fossil water.
Underground water source or water-bearing rock that will hold water but allow it to be given up in usable quantities Asset Management Plan (AMP3 and AMP4) Produced by water companies for OFWAT, these plans set out the water industry investment programme for the period 2000-2010
In hydrologic terms, permeable layers of underground rock, or sand that hold or transmit groundwater below the water table that will yield water to a well in sufficient quantities to produce water for beneficial use.
An aquifer is a saturated permeable geologic unit that is capable of transmitting significant quantities of water under ordinary hydraulic gradients or is permeable enough to yield economic quantities of water to wells. In Jamaica, there are three general types of aquifer: Alluvium aquifer is composed mainly of gravel and sand with some silt and clay which are deposited by physical processes in river channels or on flood plains. Limestone aquifer is composed of members of the White Limestone Group and exhibits mature karstic features such as a very high infiltration capacity, predominant subsurface drainage, and highly compartmentalized subsurface conduit flow. Coastal aquifer is composed of raised reefs of the Falmouth Formation, which are highly karstified limestone aquifers with high permeability and low groundwater storage potential.
One or more strata of rock or sediment that is saturated and sufficiently permeable to yield economically significant quantities of water to wells or springs. An aquifer includes any geologic material that is currently used or could be used as a source of water (for drinking or other purposes) within the target distance limit. All geologic materials combined into one aquifer are referred to as a single hydrologic unit.
A geological formation capable of storing and yielding significant quantities of water. It is usually composed of sand, gravel, or permeable rock which lies upon a layer of clay or other impermeable material. This impermeable layer does not allow the water to penetrate to lower depths. Thus, various aquifers can be present at various depths. The low permeability formation located above and/or below an aquifer is called an aquiclude. The water in aquifers is abstracted using wells. The shallowest aquifer is the most exposed to contaminants filtering down from the surface. The shallow aquifer can be protected from contamination by the presence of an impermeable layer above it. This layer can be natural or artificial - paving, etc.
A layer of underground sand, gravel, or permeable rock in which water collects. Aquifers may lie close to the surface or at great depths. Aquifers can be hundreds of miles long and wide or narrow, shallow veins running through rock. With such flat ground in the Grand Prairie, rainwater matriculates down through the porous sedimentary rocks where it is stored. When the water source becomes of significant size, it is termed an aquifer, especially when drilling into the rock allows the tapping of the aquifer for use in crop irrigation and animals as well as human use
A geologic formation capable of transmitting water through its pores at a rate sufficient for water supply purposes. The term water-bearing is sometimes used synonymously with aquifer when a stratum furnishes water for a specific use. Aquifers are usually saturated sands, gravel, fractures, caverns or vesicular rock.
A geological formation through which water may percolate slowly and for long distances, eventually yielding groundwater to springs and wells. Underground water is stored in dozens of reservoir-like layers. Most of the water in aquifers is contained in beds of sand, gravel or other materials and can be pumped to the surface.
Pohjavettä johtava kerros Akvifer A subsurface layer or layers of rock or other geological strata of sufficient porosity and permeability to allow either a significant flow of groundwater or the abstraction of significant quantities of groundwater.
An aquifer that is bounded above and below by impermeable rock or sediment layers. The water in the aquifer is also under enough pressure that, when the aquifer is tapped by a well, the water rises up the well bore to a level that is above the top of the aquifer. The water may or may not flow onto the land surface.
An aquifer that is not overlain by an impermeable rock unit. The water in this aquifer is under atmospheric pressure and is recharged by precipitation that falls on the land surface directly above the aquifer.
A body of rock saturated with water, that is capable of allowing the subterranean water to be stored, transmitted and is capable of absorbing recharge water. It can yield water through a well or a spring.
A geologic formation(s), such as the bedrock that underlies surface soils. These rock formations store and/or transmit water, such as to wells and springs. An aquifer typically refers to those bedrock formations that can yield sufficient water to constitute a usable supply for people's uses.
An underground layer of rock, sand, or gravel capable of storing water within cracks and pore spaces, or between grains. When water contained within an aquifer is of sufficient quantity and quality, it can be tapped and used for drinking or other purposes. The water contained in the aquifer is call groundwater.
One or more geologic formations containing sufficient saturated porous and permeable material to transmit water at a rate sufficient to feed a spring or for economic extraction by a well. Combination of two Latin words, aqua or water, and ferre, to bring; literally, something that brings water.
An underground saturated, permeable, geological formation that can transmit significant quantities of water under ordinary hydraulic gradients (see hydraulic gradient). The most common aquifers are unconsolidated sands and gravels, permeable sedimentary rocks such as sandstones and limestones, and heavily fractured volcanic and crystalline rocks. A confined aquifer is an aquifer that is confined between two confining beds, such as aquicludes or aquitards (see aquiclude and aquitard). An unconfined aquifer, or water-table aquifer, is an aquifer in which the water table forms the upper boundary (see water-table). Confined aquifers occur at depth, unconfined aquifers near the ground surface.
A geological formation or group of formations in the ground which is usually composed of rock, gravel, sand or other porous material and which yields water to wells or springs. Can be polluted by introduction of pollutants through poorly capped wells, injection waste disposal and other entries below ground.
a layer of underground sand, gravel or porous rock through which water flows slowly. Use of the term is usually restricted to those water-bearing structures capable of yielding water in sufficient quantity to constitute a usable supply.
Underground rock, sand or gravel formations which store water. Irvine Ranch Water District supplies about 50 percent of its water needs from the aquifers that make up the Orange County Groundwater Basin.
a permeable layer of rock under the surface of the ground through which water can move. Usually, aquifers are sand-stone or limestone, but some may be mixed sand and gravel, or even fractured rock. Claystones, shales, and most igneous and metamorphic rocks are aquicludes.
A geological formation, such as fractured bedrock, glacial sands or gravels, which contains water and will allow water to pass through it in sufficient quantities to be economically viable. This is known as ground water.
A layer of permeable rock sandwiched between two layers of impermeable rock. E.g. a layer of chalk sandwiched between two layers of clay. The chalk layer becomes saturated with water - this is called an aquifer.
a geologic formation, or a group or part of a geologic formation, that contains sufficient saturated permeable material to transmit significant quantities of groundwater to wells and springs Return to Previous Page.
Any strata or a group of interconnected strata comprising of saturated earth material capable of conducting groundwater and of yielding usable quantities of groundwater to borehole(s) and / or springs ( a supply rate of 0.1 L/s is considered as a usable quantity)
The saturated underground formation that will yield usable amounts of water to a well or spring. The formation could be sand, gravel, limestone or sandstone. The water in an aquifer is called groundwater. A saturated formation that will not yield water in usable quantities is called an aquiclude. Most Pennsylvania aquifers may be categorized into confined and unconfined aquifers.
a water-bearing layer of rock or sediment capable of yielding supplies of water; typically is unconsolidated deposits or sandstone, limestone or granite. Can be classified as confined or unconfined. List of Glossary Terms
Water bearer. Earth materials that contain ground water and through which ground water may flow freely. Some examples of these include sand, porous sandstone, and gravel. Aquifers vary widely in their ability to hold water and the speed at which water flows through them.
A geologic formation, group of formations, or part of a formation capable of storing, receiving and transmitting water. The formation is capable of yielding enough water to support a well or spring. Confined Aquifer An aquifer that is overlain by a confining layer of impermeable soil or rock material. The water table is separated from the atmosphere by the impermeable layer. This type of aquifer is sometimes called an artesian aquifer. Unconfined Aquifer An aquifer without an upper confining layer of impermeable soil or rock material. The water table is exposed to the atmosphere through a series of interconnected openings in the overlying permeable soil and/or rock layers and is in equilibrium with atmospheric pressure.
(1.)The three dimensional sub-surface geometry of a geologic rock formation (or, group of rock formations or part of a formation) that contains ground water in the spaces between sediment grains, in voids, or in fractures. (2.) A geological formation or structure that has the capability to store and/or transmit water to wells and springs. Use of the term aquifer is usually restricted to those water-bearing formations capable of yielding water in sufficient quantity to constitute a usable supply source.
A geologic formation that is capable of yielding a significant amount of water to a well or spring. All of he spaces and cracks, or pores, between particles of rock and other mineral are saturated with water. Water can move through the pores toward a spring or other discharge are, or pumping well
A water-bearing layer (or several layers) of rock or sediment capable of yielding supplies of water; typically is unconsolidated deposits or sandstone, limestone or granite; and can be classified as confined or unconfined.
A water bearing layer of permeable rock, sand, or gravel beneath the earth's surface. In this report, the aquifers are defined as follows: shallow aquifer: wells were typically completed across the water table at about 40 feet below ground surface. intermediate aquifer: wells were typically completed between 60 to 120 feet deep. The zone was subdivided into: a) I1 categories approximately 60 to 85 feet deep. b) I2 categories approximately 86 to 120 feet deep. deep aquifer: wells were typically completed below 120 feet deep. The zone was further subdivided into the following zones: a) D1 - generally 120 to 150 feet deep. b) D2 - generally ranges from 150 to 250 feet deep. c) D3 - generally ranges from 250 to 350 feet deep. d) D4 - generally ranges from 350 feet and deeper.
An underground formation composed of materials such as sand, soil, or gravel that can store and supply groundwater to wells and springs. Most aquifers used as a drinking water source in the United States are within a thousand feet of the earth’s surface.
A permeable body of rock, such as fractured bedrock or glacial till, that is saturated with ground water and is capable of providing significant quanties of water to wells and springs. Modified from Glossary of Geology, 4th Edition, 1997, American Geological Institute.
Hydraulically interconnected, recognizable, or able to be mapped saturated geological materials (rock or sediment) that are sufficiently conductive to provide a useable supply of water to a well or spring and that are hydraulically distinctive from surrounding geologic materials. Aquifers are distinguished by a combination of hydraulic properties, geologic character, hydraulic boundaries, hydraulic head, and water quality.
A body of rock that is sufficiently permeable to conduct ground water and to yield economically significant quantities of water to wells and springs [Bates, Robert L., and Jackson, Julia A., eds., 1987, Glossary of Geology (3d ed.): Alexandria, Va., American Geological Institute, p. 33].
a rock or granular (sand or gravel) formation in which water can collect and through which water can be transmitted; more fractured or porous formations can hold and transmit greater quantities of water and so provide a useful energy source for an EES (also see Ground water).
A geologic formation that stores water, aquifers may yield significant quantities of water to wells and springs and this water is often utilized as a primary source for municipal, industrial, irrigation and other uses.
An underground, water-bearing layer of earth, porous rock, sand, or gravel, through which water can seep or be held in natural storage. Aquifers generally hold sufficient water to be used as a water supply.
a geologic formation(s) that is water bearing. A geological formation or structure that stores and/or transmits water, such as to wells and springs. Use of the term is usually restricted to those water-bearing formations capable of yielding water in sufficient quantity to constitute a usable supply for people's uses.
soil or rock below the land surface that is saturated with water. There are layers of impermeable material both above and below it and it is under pressure so that when the aquifer is penetrated by a well, the water will rise above the top of the aquifer.
A body of rock or sediment that contains abundant fresh water in a network of connected pores (small intergranular spaces) or fractures. Aquifers generally are characterized by the amount of pore space that they contain (porosity) and the capacity for water to pass through interconnected pore networks (permeability). [ Return to text passage
A geologic formation that stores and/or transmits water. A confined aquifer is bounded above and below by formations of impermeable or relatively impermeable material. An unconfined aquifer is made up of loose material, such as sand or gravel, that has not undergone settling, and is not confined on top by an impermeable layer.
A geologic formation(s) such as the bedrock that underlies the soil surface. These rock formations store and/or transmit water to springs and wells which provide drinking water. An aquifer typically refers to those bedrock formations that can yield sufficient water to constitute a usable supply for people's uses.
A geologic formation (or one or more geologic formations) that is porous enough and permeable enough to transmit water at a rate sufficient to feed a spring or a well. An aquifer transmits more water than an aquitard Sandstone beds and the Ogallala Formation are some of the best water-producing layers in Kansas and are used extensively for private and municipal water supplies.
An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt, or clay) from which groundwater can be usefully extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology.