1. Water Supply and Demand Chapter 3, Section 1

2. I. How People Use Water I. How People Use Water Household,industry, agriculture, recreation Household,industry, agriculture, recreation A water shortage occurs when there is too little water or too great a demand in an area, or both A water shortage occurs when there is too little water or too great a demand in an area, or both Ex: Colorado River Ex: Colorado River A. In the home A. In the home 1. wash face, flush toilet, cook, etc. 1. wash face, flush toilet, cook, etc.

3. B. Industry and Transportation B. Industry and Transportation 1. rivers are natural highways 1. rivers are natural highways 2. water is used to cool machinery and make products 2. water is used to cool machinery and make products C. Agriculture 1. irrigation – supplying water to areas of land to make them suitable for growing crops 2. more water is used for irrigation than any other purpose! D. Recreation D. Recreation 1. swimming, water skiing,… 1. swimming, water skiing,…

4. II. Conserving Water II. Conserving Water Conservation is the practice of using less of a resource so it will not be used up to fast Conservation is the practice of using less of a resource so it will not be used up to fast Three ways to conserve water is to reduce water use, recycle water, and reuse water Three ways to conserve water is to reduce water use, recycle water, and reuse water A. In the Home 1. take shorter showers 2. turn off faucet 3. water late at night or early in day

5. B. In Industry B. In Industry 1. using water saving techniques 1. using water saving techniques 2. cooling pools: heated water cools off and then is used again 2. cooling pools: heated water cools off and then is used again C. In Agriculture 1. Highest use of water 2. Sprinkler irrigation, drip irrigation

6. III. Fresh Water for the future III. Fresh Water for the future A. Desalination A. Desalination 1. def: making fresh water from salty water 1. def: making fresh water from salty water 2. distillation: boiling water so that is evaporates, leaving salt behind 2. distillation: boiling water so that is evaporates, leaving salt behind 3. freeze the water, which leaves the salt behind 3. freeze the water, which leaves the salt behind 4. pump through a very fine filter, leaving salt behind 4. pump through a very fine filter, leaving salt behind 5. Expensive b/c of energy and equipment it requires. 5. Expensive b/c of energy and equipment it requires. 6. Many nations in the dry S.W. Asia depend on it 6. Many nations in the dry S.W. Asia depend on it

7. B. Icebergs B. Icebergs 1. Fresh water 1. Fresh water 2. Tow the berg to shore 2. Tow the berg to shore 3. Con: would cause climate change 3. Con: would cause climate change