1. Water Use and Management WHO – 1,000,000,000+ people lack access to fresh water 10,000,000+ people die annually from water- related diseases

2. Global Water Use

3. Residential Water Use

4. Water Treatment Performed to remove pathogens (disease- causing organisms) and toxins from water Water is treated to become potable – suitable for drinking

5. Drinking-Water Treatment

6. Industrial Water Use

7. Most water used in industry - used to cool power plants. – pump water from river or a lake – carry water through cooling tower – return water to river or lake. Returned water is warmer than the source, but is clean and can be reused.

8. Agricultural Water Use

9. Irrigation Provides crops with water from sources other than precipitation. Techniques: – Shallow ditches – Overhead sprinklers Most water evaporates before reaching plant roots

10. Water Management Projects Designed for areas with inadequate surface water Provide water to dry areas. Ex. SRP allows people to live and grow crops in desert areas. – Provide water – Generate electric power

11. Water Diversion Projects Divide rivers into canals to supply water to arid regions. Ex. Colorado Watershed

12. Dams and Reservoirs Dam - structure built across a river to control a river ’ s flow. Reservoir - body of water that forms behind a dam. – Used for drinking water, irrigation, recreation, and industry.

13. Dams and Reservoirs Hydroelectric dams use the power of flowing water to generate electrical energy.