groundwater aquifers

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• groundwater — [groundwôt΄ər] n. water found underground in porous rock strata and soils, as in a spring: also written ground water * * * ground water also ground·wa·ter (groundʹwô tər, wŏt ər) n. Water beneath the earth s surface, often between saturated soil… …   Universalium

• Groundwater-related subsidence — is the subsidence (or the sinking) of land resulting from groundwater extraction. One estimate has 80% of serious land subsidence problems associated with the excessive extraction of groundwater [http://water.usgs.gov/ogw/pubs/fs00165/] , making… …   Wikipedia

• Groundwater — Shipot, a common source of drinking water in a Ukrainian village. Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an… …   Wikipedia

• Groundwater flow equation — Used in hydrogeology, the groundwater flow equation is the mathematical relationship which is used to describe the flow of groundwater through an aquifer. The transient flow of groundwater is described by a form of the diffusion equation, similar …   Wikipedia

• Groundwater recharge — Water balance Groundwater recharge or deep drainage or deep percolation is a hydrologic process where water moves downward from surface water to groundwater. This process usually occurs in the vadose zone below plant roots and is often expressed… …   Wikipedia

• Groundwater sapping — Scientists believe that groundwater sapping created these gullies in Noachis Terra on Mars. NASA image …   Wikipedia

• groundwater — noun Water that exists beneath the earths surface in underground streams and aquifers …   Wiktionary

• List of aquifers — The following is a partial list of aquifers around the world. A of aquifers is also available.North AmericaCanada * Oak Ridges Moraine North of Toronto Ontario * Laurentian River SystemUnited States* Biscayne Aquifer * Bruceian Aquifer * Edwards… …   Wikipedia

• Aquifer — Typical aquifer cross section An aquifer is a wet underground layer of water bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from which groundwater can be usefully extracted using a water well. The study of water flow… …   Wikipedia

• environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

• Water pollution — Raw sewage and industrial waste flows across international borders New River passes from Mexicali to Calexico, California. Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater). Water p …   Wikipedia