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Groundwater:

This section focuses on types of groundwater sources and why some may no be longer available for domestic water use.
 

Ground water accumulates in the space between soil  particles, rock or within the major cracks of bedrock. Major  reservoirs of ground water are referred to as aquifers.

Ground water has been a primary resource, due primarily,  to it's higher range of water quality and the reduced capital  expenditure associated with providing water to remote  locations.

The Occurrence of Ground Water

Approximately 97 percent of the world's fresh water (excluding polar ice caps) is ground water.

Aquifers occur in two types of geologic formations.

  • Consolidated formations
    Consolidated formations are those composed of solid rock with ground water found in the cracks. The amount of ground water In a consolidated formation depends on how many cracks there are and the site of the cracks. For example, consolidated limestone formations often contain caverns with much water In them.

  • Unconsolidated formations
    Unconsolidated formations are composed of sand and gravel, cobblestones, or loose soil material. The quantity of ground water in an unconsolidated formation varies depending upon the density of the solids within the formation. Sand, gravel and cobblestone formations are generally high-yield aquifers, whereas, fine grained materials typically possess low yields.

    Percent of population dependent upon ground water, by State. (top 10)

Hawaii 93
Mississippi 93
Idaho 91
Florida 91
Nebraska 90
New Mexico 90
South Dakota 85
Iowa 81
Minnesota 80
Alaska 79
Wisconsin 70

 
 
 

 

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