Water existing beneath the earth's surface in underground streams and aquifers
Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of lithologic formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table. Groundwater is recharged from, and eventually flows to, the surface naturally; natural discharge often occurs at springs and seeps, streams and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal and industrial use by constructing and operating extraction wells. The study of the distribution and movement of groundwater is hydrogeology, also called groundwater hydrology.
Typically, groundwater is thought of as liquid water flowing through shallow aquifers, but technically it can also include soil moisture, permafrost (frozen soil), immobile water in very low permeability bedrock, and deep geothermal or oil formation water. Groundwater is hypothesized to provide lubrication that can possibly influence the movement of faults. It is likely that much of the Earth's subsurface contains some water, which may be mixed with other fluids in some instances. Groundwater may not be confined only to the Earth. The formation of some of the landforms observed on Mars may have been influenced by groundwater. There is also evidence that liquid water may also exist in the subsurface of Jupiter's moon Europa.
An aquifer is a layer of relatively porous substrate that contains and transmits groundwater. When water can flow directly between the surface and the saturated zone of an aquifer, the aquifer is unconfined. Because water tends to flow downward due to gravity, the deeper parts of unconfined aquifers are usually more saturated with groundwater.
The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where generally all pore spaces are saturated with water is the phreatic zone.
Substrate with relatively low porosity that permits limited transmission of groundwater is known as an aquitard. An aquiclude is a substrate with porosity that is so low it is virtually impermeable to groundwater.
A confined aquifer is an aquifer that is overlain by a relatively impermeable layer of rock or substrate such as an aquiclude or aquitard. If a confined aquifer follows a downward grade from its recharge zone, groundwater can become pressurized as it flows. This can create artesian wells that flow freely without the need of a pump or rise to a higher elevation than the static water table at the above, unconfined aquifer.
The characteristics of aquifers vary with the geology and structure of the substrate and topography in which they occur. Generally, the more productive and useful aquifers occur in sedimentary geologic formations. By comparison, weathered and fractured crystalline rocks yield relatively smaller quantities of groundwater in many environments. Unconsolidated to poorly cemented alluvial materials that have accumulated as valley-filling sediments in major river valleys and geologically subsiding structural basins are included among the most productive sources of groundwater.
The high specific heat capacity of water and the insulating effect of soil and rock can mitigate the effects of climate and maintain groundwater at a relatively steady temperature. In some places where groundwater temperatures are maintained by this effect at about 50°F/10°C, groundwater can be used for controlling the temperature inside structures at the surface. For example, during hot weather relatively cool groundwater can be pumped through radiators in a home and then returned to the ground in another well. During cold seasons, because it is relatively warm, the water can be used in the same way as a source of heat for heat pumps that is much more efficient than using air. The relatively constant temperature of groundwater can also be used for heat pumps.
Aquifers can be saline, fresh, or brackish. Most of the the groundwater contained in aquifers is saline, particularly within deeper sources. Nevertheless, more than 90% of the world's non-frozen freshwater supplies are stored in aquifers.
- The Groundwater Foundation — Educating and Motivating People To Care About Groundwater
- Groundwater Information from the Coastal Ocean Institute, Woods Hole Oceanographic Institution
- National Ground Water Association
- UK Groundwater Forum — provides a good introduction to groundwater hydrology
- Connected Waters Initiative, University of New South Wales — Investigating and raising awareness of groundwater and water resource issues in Australia
- American Water Resources Association
- Multimedia course on groundwater
groundwater in Afrikaans: Grondwater
groundwater in Arabic: ماء جوفي
groundwater in Bulgarian: Грунтови води
groundwater in Catalan: Mantell freàtic
groundwater in Czech: Podzemní voda
groundwater in Danish: Grundvand
groundwater in German: Grundwasser
groundwater in Estonian: Põhjavesi
groundwater in Spanish: Agua subterránea
groundwater in Esperanto: Grundakvo
groundwater in Persian: آبهای زیرزمینی
groundwater in French: Eau souterraine
groundwater in Korean: 지하수
groundwater in Icelandic: Grunnvatn
groundwater in Italian: Falda acquifera
groundwater in Hebrew: מי תהום
groundwater in Lithuanian: Požeminis vanduo
groundwater in Dutch: Grondwater
groundwater in Japanese: 地下水
groundwater in Norwegian: Grunnvann
groundwater in Norwegian Nynorsk: Grunnvatn
groundwater in Polish: Woda gruntowa
groundwater in Portuguese: Água subterrânea
groundwater in Romanian: Pânză freatică
groundwater in Russian: Подземные воды
groundwater in Sicilian: Farda
groundwater in Slovak: Podzemná voda
groundwater in Slovenian: Podtalnica
groundwater in Serbian: Подземне воде
groundwater in Sundanese: Cai taneuh
groundwater in Finnish: Pohjavesi
groundwater in Swedish: Grundvatten
groundwater in Telugu: భూగర్భ జలం
groundwater in Ukrainian: Підземні води
groundwater in Chinese: 地下水