1. Using Our Water Resources in the 21 st Century U.S. Conference of Mayors Urban Water Council June 25, 2004 Susan S. Hutson U.S. Geological Survey

2. Water Resources Water availability and Water use Inevitable question: Inevitable question: Will there be sufficient freshwater resources in the future to sustain economic growth and the quality of life?

3. Constraint Water supply is limited and fixed

4. Constraint Increasing instream demands for the water

5. Planning for future supply needs

6. Estimated use of water in the United States in 2000

7. Circular 1268 Estimated Use of Water in the United States in 2000 Highlights Highlights Water use remains stable despite population growth Water use remains stable despite population growth Chief water uses are power generation and irrigation Chief water uses are power generation and irrigation Community water use is rising, but not faster than population change Community water use is rising, but not faster than population change More people are dependent on groundwater More people are dependent on groundwater

8. Total U.S. water use for 2000: 408 billion gallons per day Fills 8 billion bathtubs per day Fills 8 billion bathtubs per day Fills the Empire State Building 1,470 times a day Fills the Empire State Building 1,470 times a day 1,430 gallons per person per day 1,430 gallons per person per day

9. Water withdrawals by category IrrigationMiningIndustrialAquaculture 34 percent > 1 percent Livestock 11 percent Public Supply 48 percent Thermoelectric power 5 percent > 1 percent Domestic

10. U.S. Population in millions Total withdrawals in BGD

11. Change in per capita since 1950

13. Per capita use in gpd in 2000

14. Source of Water Supply

15. Freshwater or saline Surface or ground water

16. Total surface-water and ground-water withdrawals

17. Ground-water withdrawals Surface-water withdrawals

18. IrrigationMiningIndustrialAquaculture 34 percent Less than 1 percent Livestock 11 percent Public Supply 48 percent 48 percent Thermoelectric 5 percent Less than 1 percent Domestic

19. Thermoelectric-power withdrawals

20. IrrigationMiningIndustrialAquaculture 34 percent Less than 1 percent Livestock 11 percent Public Supply 48 percent Thermoelectric power 5 percent Less than 1 percent Domestic

21. Irrigation Withdrawals

22. IrrigationMiningIndustrialAquaculture 34 percent Less than 1 percent Livestock 11 percent 11 percent Public Supply 48 percent Thermoelectric power 5 percent Less than 1 percent Domestic

23. Public supply withdrawals

24. Population served by public supply in millions Public supply withdrawals in BGD

25. http://water.usgs.gov/watuse/ http://pubs.water.usgs.gov/circ1268/