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  2. Aquifer - Wikipedia

    en.wikipedia.org/wiki/Aquifer

    The Guarani Aquifer, located beneath the surface of Argentina, Brazil, Paraguay, and Uruguay, is one of the world's largest aquifer systems and is an important source of fresh water. [28] Named after the Guarani people , it covers 1,200,000 km 2 (460,000 sq mi), with a volume of about 40,000 km 3 (9,600 cu mi), a thickness of between 50 and 800 ...

  3. Groundwater - Wikipedia

    en.wikipedia.org/wiki/Groundwater

    This is an accepted version of this page This is the latest accepted revision, reviewed on 19 February 2025. Water located beneath the ground surface An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the water table (4), and three different wells (7, 8 and 9) dug to reach it. Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in ...

  4. Groundwater recharge - Wikipedia

    en.wikipedia.org/wiki/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. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table ...

  5. What is the Ogallala Aquifer and why is it running out of water?

    www.aol.com/ogallala-aquifer-why-running-water...

    Over thousands of years, water dripped below the surface creating an underground water deposit called the Ogallala Aquifer. The water — which spans from South Dakota to Texas and was once the ...

  6. Ogallala Aquifer - Wikipedia

    en.wikipedia.org/wiki/Ogallala_Aquifer

    The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]

  7. Coastal hydrogeology - Wikipedia

    en.wikipedia.org/wiki/Coastal_hydrogeology

    A graph shows the groundwater level and sea level changes with respect to the tide on a small island in Portugal. The solid line represents the sea level change in the estuary and the dotted line is date from a piezometer that installed 50 m apart from the coastal line. It shows a time lag between the sea tide and the tide of groundwater.

  8. Underwater environment - Wikipedia

    en.wikipedia.org/wiki/Underwater_environment

    The salt content lowers the freezing point by about 1.9 °C and lowers the temperature of the density maximum of water to the fresh water freezing point at 0 °C. [19] This is why, in ocean water, the downward convection of colder water is not blocked by an expansion of water as it becomes colder near the freezing point. The oceans' cold water ...

  9. Aquifer properties - Wikipedia

    en.wikipedia.org/wiki/Aquifer_properties

    The aquifer properties of the aquifer essentially depend upon the composition of the aquifer.The most important properties of the aquifer are porosity and specific yield which in turn give its capacity to release the water in the pores and its ability to transmit the flow with ease.