11-2 water use and management page 276. a. global water use 1. there are three major uses for water:...
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11-2 Water Use and Management
Page 276
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A. Global Water Use• 1. There are three major uses for water:
residential use, agricultural use, and industrial use.
•
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B. Residential Water Use
• 1. There are major differences throughout the world.
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B. Residential Water Use
• 2. The average person in the United States uses about 300 L of water a day. But in India, the average person uses only 41 L of water everyday.
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C. Water Treatment
• 1. Most water must first be made• potable (suitable for drinking).
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C. Water Treatment
• 2. Removes elements such as mercury, arsenic, and lead, which are poisonous to humans even in low concentrations.
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C. Water Treatment
• 3. A pathogen is a virus, microorganism, or other substance that causes disease.
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C. Water Treatment
• 4. Pathogens are found in water contaminated by sewage or animal feces, but can be removed with water treatment.
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D. Industrial Water Use
• 1. Industry accounts for 19 percent of water used in the world.
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D. Industrial Water Use
• 2. Water is used to manufacture goods, to dispose of wastes, and to generate power.
• 3. Most of the water that is used in industry is used to cool power plants.
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E. Agricultural Water Use
• 1. Agriculture accounts for 67 percent of the water used in the world. Plants require a lot of water to grow, and as much as 80 percent of the water used in agriculture evaporates.
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F. Dams and Reservoirs
• 1. A dam is a structure that is built across a river to control a river’s flow.
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F. Dams and Reservoirs
• 2. A reservoir is an artificial body of water that usually forms behind a dam. Water from a reservoir can be used for flood control, drinking water, irrigation, recreation, and industry.
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Water Conservation
• 1. People can conserve water by changing a few everyday habits and by using only the water that they need. Water-saving technology, such as low-flow toilets, can also help reduce household water use.