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11.2 Water Use and Management

11.2 Water Use and Management

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11.2 Water Use and Management

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  1. 11.2 Water Use and Management Pg 296 – 303 “We all live downstream”

  2. Global Water Use • 3 Major uses: • ____________________ - 8% drinking/washing • _____________________– most freshwater • ____________________________- 19% • Europe and N. America • How people use water depends on: • Availability of ______________________ • Populations ___________________ • ______________________ conditions

  3. Residential Water Use • Average Daily use of water (see chart pg 297) • U.S. _____ L (80 gal) daily – ½ inside ½ outside home • India 41 L • Water Treatment • ____________________: safe to drink • Remove: mercury, arsenic, lead (natural or pollution) • Remove: ___________________ – from feces • Use physical and chemical ______________(pg 297)

  4. Industrial Water Use 19% world wide • Uses for industry: • Manufacture ____________________ • Dispose of ________________________ • Generate ________________________ • EX: 1,000 L for 1 kg of AL • Most used to cool power plants • Take surface water from river or lake to cool and pump back to water. It is usually warmer, “clean”, able to be reused.

  5. Agricultural Water Use67% use world wide • EX: 300L to produce ear of corn! • 80% of water ____________________ and never reaches plant roots • Irrigation: • Even if fertile soil sometimes not enough rainfall. • Irrigation provides ___________________ • Flooding fields, Shallow ditches, sprinklers • Do you think sprinklers are efficient?

  6. Water Management Projects • Human Made: • Romans made ______________________ from mountain to France and Spain. • _____________ (control river flow and creates a reservoir) • ____________________ • Why? • Make land habitable • Create reservoir (recreation, drinking, flood control, irrigation, industry) • Generate electric (dams supply 20% power globally) • Consequences: people displaced, ecosystems destroyed, less productive farmland. • Example: Colorado River diverted for 7 states. River usually runs dry before it reaches Mexico and into Gulf of CA.

  7. Water Conservation • As water is depleted it becomes more ______________________! • Dig deeper wells, pipe greater distances, clean up pollution • Agriculture: __________ irrigation systems sometimes controlled by computers and satellite • Industry: ____________cooling and waste water • Home: _____________ what you need, technology, education • Examples? Pg 302

  8. Solutions for the Future • ________________________: • Process of removing salt from ocean water. • Middle East • Heat water and collect fresh water that evaporates • Very EXPENSIVE! • Transport • ____________ (EX: Greek islands and tourists) • US consider water from Alaska to California • Towing ___________________(not efficient) 