US Water Sources and Usage

Population density

Population density

Trends in population and freshwater withdrawals

Average annual precipitation

Streams and waterbodies

U.S. Aquifers

US water use billion gallons of water per day withdrawn in 2000

Public water use 43 billion gallons of water per day withdrawn in 2000

Industrial water use 20 billion gallons of water per day withdrawn in 2000

Water used for irrigation billion gallons of water per day withdrawn in 2000

Water used for irrigation

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

195 billion gallons of water per day withdrawn in 2000

Water used by thermoelectric power plants Steam-driven turbine generators Cooling power- producing equipment Used water has to be cooled before release

Total water withdrawals by state

World Drinking Water Coverage

Activities Hydrology trivia quiz rivia_water_1.htm How would you handle this water crisis?