It is important to know what chemicals are dissolved

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It is important to know what chemicals are dissolved! Hard Water contains substantial amounts of calcium and magnesium Greater than 80 to 100 ppm
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Water Use and Water Supply In U.S. the east is generally humid – More dependence is on surface water In the west more arid condition are found –More dependence is on ground water and impounding surface water for storage Global water usage –Too many people Too much demand Not many places to find more water
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Case Studies in Water Consumption Plenty of water-supply problems: lakes, streams, or ground water The Colorado River Basin Drains portions of seven western states and many of these states have extremely dry climates –Is an international stream and Mexico is entitled to some of its water The High Plains (Ogallala) Aquifer System The Ogallala Formation, a sedimentary aquifer, underlies most of Nebraska and sizeable portions of Colorado, Kansas, and the Texas and Oklahoma panhandles The most productive units of the aquifers are sandstones and gravels The Aral Sea, a disappearing lake Lies on the border of Kazakhstan and Uzbekistan Lake Chad A disappearing lake on the edge of the Sahara Desert
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Extending the Water Supply Conservation – a must do strategy in U.S. – Water is wasted every day in different ways Interbasin Water Transfer –Conservation alone will not resolve the imbalance between demand and supply Moving surface waters from one stream system’s drainage basin to another’s where demand is higher Desalination Improve and purify waters not now used and make them usable (but increases demand on energy use)
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