1. Uses for Water
Text pages
Section 20.1

2. Three Main Uses of Water
Residential Use 9%
Industrial Use
44%
Agricultural Use
47%

3. Residential Uses

4. Residential Usage Facts
The average person uses 300 L of water daily.
A lawn sprinkler uses up to 40 L of water every minute.
Daily uses
Brushing teeth – L
Showering L
Bathing (tub) L
Clothes washing L

5. Industrial Uses Transport goods Dispose of wastes
Coolant for power production

6. Industrial Uses
Some industries that use large amounts of water produce
Food
Paper
Chemicals
refined petroleum
primary metals.

7. True or False It takes 10 gallons of water to produce 1 can of soda.
It takes 2000 gallons of water to manufacture one car.
-True or False

8. Thermoelectric Power Water Use
Thermoelectric power has been the category with the largest water withdrawals since 1965, and for 2000
The largest total and fresh and saline surface-water withdrawals were during 1980.
Withdrawals increased during 1950 to 1980.
Withdrawals declined and
have stabilized since 1980.

10. Cooling Technologies
Closed-cycle systems discharge heat through evaporation in cooling towers and recycle water within the power plant. The water required to do this is comparatively small since it is limited to the amount lost through the evaporative process. Because of the expense associated with closed-cycle cooling, once-through systems are far more common.
Once-through systems require the intake of a continual flow of cooling water. The water demand for the once-through system is 30 to 50 times that of a closed cycle system.

12. Agricultural Use
Irrigation – the process of bringing water to an area for use in growing crops.
Main types
Flood – flooding of an area that is flat
Furrow- releases water into ditches dug between crop rows
Overhead irrigation – sprinkler systems and drip or trickle from above the crops.
Subirrigation – water is introduce beneath the soil

13. Use your text to find the benefits and limits of each type of irrigation
Flood Irrigation -

14. Use your text to find the benefits and limits of each type of irrigation
Furrow Irrigation -

15. Use your text to find the benefits and limits of each type of irrigation
Overhead Irrigation – Sprinklers -
Drip or trickle -

16. Use your text to find the benefits and limits of each type of irrigation
Subirrigation