1. Environmental Science
Water Use
Environmental Science

2. Global water use Most of the water worldwide is used to irrigate crops
The availability of freshwater, population sizes and economic conditions affect how people use water
Three major uses for water are:
Residential use
Agricultural use
Industrial use

3. Residential Use
About 8% of water is used for household activities like drinking and washing
Water Treatment makes water potable or safe to drink
Removes elements like mercury, lead, and arsenic which are poisonous
Removes pathogens or organisms that make you sick

5. Industrial Water Use 19% of water used in the world
Most used to cool power plants
Use to manufacture goods, dispose of waste, and generate power
It takes 500,000 L of water to manufacture one car!

6. Agricultural Water Use
67% of water used in the world
Irrigation provides plans with water that is from precipitation
As much as 80% of the water never reaches the plants because it evaporates
It takes about 300L to produce one ear of corn!

7. Human Water Management
Goals include making a dry area habitable, creating a reservoir for recreation/drinking water, or generating electric power

8. Water Management: Aqueducts
Romans in France and Spain

9. Water Management: Dams

10. Water Management: Water Diversion Canals

11. Water Conservation: Agriculture
Drip Irrigation Systems: deliver small amounts of water directly to plant roots by using perforated tubing

12. Water Conservation: Industry
Recycling: cooling water and wastewater are recycled, saving money and water

13. Water Conservation: Home
Shorter Showers, no baths
Low-flow shower heads
Install low-flow aerators in water faucets
Low-flow toilet, water-filled bottle in tank
Turn off water when brushing teeth
Fill sink when washing face/hands, shaving, doing dishes
Full loads in dishwasher/washing machine
Rarely water lawn

14. Future Solutions Desalination: removing salt from water
Uses lots of energy and is expensive
Transporting Water: towing bags of water from one area to another (Ex: Alaska to California), or towing icebergs