1. US Water Sources and Usage

2. Population density - 1980 http://www.nationalatlas.gov/natlas/Natlasstart.asp

3. Population density - 2000 http://www.nationalatlas.gov/natlas/Natlasstart.asp

4. Trends in population and freshwater withdrawals 1950-2000 http://pubs.usgs.gov/circ/2004/circ1268/

5. Average annual precipitation 1961-1990 http://www.nationalatlas.gov/natlas/Natlasstart.asp

6. Streams and waterbodies http://www.nationalatlas.gov/natlas/Natlasstart.asp

7. U.S. Aquifers

8. US water use 2000 http://pubs.usgs.gov/circ/2004/circ1268/ 408 billion gallons of water per day withdrawn in 2000

9. Public water use http://www.nationalatlas.gov/natlas/Natlasstart.asp 43 billion gallons of water per day withdrawn in 2000

10. Industrial water use http://www.nationalatlas.gov/natlas/Natlasstart.asp 20 billion gallons of water per day withdrawn in 2000

11. Water used for irrigation http://pubs.usgs.gov/circ/2004/circ1268/htdocs/figure07.html 137 billion gallons of water per day withdrawn in 2000

12. Water used for irrigation http://ga.water.usgs.gov/edu/wuir.html

13. Irrigation techniques Flood irrigation –Simple and cheap –50% of water wasted Drip irrigation –Low pressure and volume systems –Water applied directly to the root zone –Approx. 70% efficiency Spray irrigation –Up to 35% of water lost due to evaporation Low-energy spray irrigation –Nozzle very close to ground –Up to 90% efficiency http://ga.water.usgs.gov/edu/wuir.html

14. http://pubs.usgs.gov/circ/2004/circ1268/htdocs/figure12.html 195 billion gallons of water per day withdrawn in 2000

15. Water used by thermoelectric power plants Steam-driven turbine generators Cooling power- producing equipment Used water has to be cooled before release http://ga.water.usgs.gov/edu/wupt.html

16. Total water withdrawals by state http://pubs.usgs.gov/circ/2004/circ1268/

17. World Drinking Water Coverage http://www.who.int/water_sanitation_health/monitoring/jmp04_3.pdf

18. Activities Hydrology trivia quiz http://interactive2.usgs.gov/learningweb/fun/t rivia_water_1.htm How would you handle this water crisis? http://ga.water.usgs.gov/edu/sos3.html