chapter 11-2 water use and management. global water use more than one billion people lack access to...
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Chapter 11-2Water Use and Management
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Global Water Use
• More than one billion people lack access to a clean, reliable source of water
• What is currently happening to the World’s population?
• Irrigation is the major use of water worldwide
• Use varies by region
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Residential Water Use
• US about 300 Liters or 80 gallons per day
• Contrast that with India only about 41 liters or about 10 gallons per day for each person
• In US about half for use inside the home.
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Industrial Water Use
• 19 % of water use in the world• Most industrial water is used to cool power
plants
• It takes a lot of water to make things– 1000 L to make 1 Kg of aluminum– 500,000 L to make a car!
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Agricultural Water Use
67% of world water use
Ex: 300 L of water to produce one ear of corn
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Types of Irrigation
• Flood
• Furrow
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• Overhead• Drip
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Water Management Projects
• Water Diversion
• Example Owens River -
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• Dams and Reservoirs• Used for water
storage, diversion , hydroelectric power, flood control
• Examples: Friant Dam
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Water Conservation
• Most Ag water is lost to evaporation and runoff.
• Can be reduced by using drip irrigation and high technology monitoring.
• In industry – water can be recycled instead of just putting it into a river or the ocean
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Conservation at Home
• Low Flow Toilets and shower heads
• Water meters
• Xeroscaping
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Solutions for the Future
• Desalination – requires lots of energy
• Transporting water – requires lots of energy