1. Water Use and Management
Chapter 11-2

2. Clean Water
A shortage of clean, fresh water is one of the world’s biggest environmental problems
More than 1 billion people lack access to clean fresh water

3. Global Water Use

4. Residential Water Use
Average water use per person in US – 80 gallons a day (300 L)
½ is used for residential use
India gallons(41 L)

6. Water Treatment Potable – water that is made safe to drink
Pathogens – organisms that cause illness or disease
Bacteria, viruses, protozoa, and parasitic worms
Water with feces

8. Industrial Water Use Industry - 19% of water used in the world
Manufacture goods
Dispose of waste
Generate power
132,000 gallons of water are needed to manufacture a car

9. Cooling Power Plants

10. Agricultural Water Use
80 gal to produce an ear of corn
Agriculture - 67% of water used in world
80% of water evaporates before it reaches the roots

11. Irrigation
Irrigation – method for providing plants with water other than precipitation
Early irrigation – flooding of fields

12. Water Diversion Projects
Owens River in California
Colorado River

13. Dams and Reservoirs Dam – structure built to control a river’s flow
Built for electrical energy
Reservoir – artificial lake that is formed behind a dam

16. Hydroelectric Dam Flowing water turns turbine
Turbine generates electricity

17. Negative Effects Displacement of ecosystems
Blocks fertile sediments from reaching down stream
Bursting dams

18. 3 Dam Clips

19. Water Conservation Agriculture Drip irrigation System
Most lost through Evaporation
Run-off
Seepage
Drip irrigation System
Releases water at a controlled rate
Directly to roots

21. Water Conservation Industry Some cities pay small business to conserve
Recycling of cooling and waste water
Some cities pay small business to conserve

22. Water Conservation Home
Low-flow toilets and showers
1/3 of water used is for landscaping
Water at night
Xeriscaping – designing landscape that uses minimal water

24. Desalination Desalination – process of removing salt from ocean water
Heat salt water and collect evaporated water
Expensive

25. Transporting Water Almost ½ of water in U.S. is in Alaska
Talks of hauling water to dry areas
77% of Earth’s freshwater is found in ice
Transporting ice?

26. Desalination Clip