11.2 Water Use and Management Pg 296 – 303 “We all live downstream”

Global Water Use 3 Major uses: – ____________________ - 8% drinking/washing – _____________________– most freshwater – ____________________________- 19% Europe and N. America How people use water depends on: – Availability of ______________________ – Populations ___________________ – ______________________ conditions

Residential Water Use Average Daily use of water (see chart pg 297) – U.S. _____ L (80 gal) daily – ½ inside ½ outside home – India 41 L Water Treatment – ____________________: safe to drink – Remove: mercury, arsenic, lead (natural or pollution) – Remove: ___________________ – from feces – Use physical and chemical ______________(pg 297)

Industrial Water Use 19% world wide Uses for industry: – Manufacture ____________________ – Dispose of ________________________ – Generate ________________________ EX: 1,000 L for 1 kg of AL Most used to cool power plants – Take surface water from river or lake to cool and pump back to water. It is usually warmer, “clean”, able to be reused.

Agricultural Water Use 67% use world wide EX: 300L to produce ear of corn! 80% of water ____________________ and never reaches plant roots Irrigation: – Even if fertile soil sometimes not enough rainfall. – Irrigation provides ___________________ Flooding fields, Shallow ditches, sprinklers – Do you think sprinklers are efficient?

Water Management Projects Human Made: – Romans made ______________________ from mountain to France and Spain. – _____________ (control river flow and creates a reservoir) – ____________________ Why? – Make land habitable – Create reservoir (recreation, drinking, flood control, irrigation, industry) – Generate electric (dams supply 20% power globally) Consequences: people displaced, ecosystems destroyed, less productive farmland. Example: Colorado River diverted for 7 states. River usually runs dry before it reaches Mexico and into Gulf of CA.

Water Conservation As water is depleted it becomes more ______________________! – Dig deeper wells, pipe greater distances, clean up pollution Agriculture: __________ irrigation systems sometimes controlled by computers and satellite Industry: ____________cooling and waste water Home: _____________ what you need, technology, education – Examples? Pg 302

Solutions for the Future ________________________: – Process of removing salt from ocean water. Middle East Heat water and collect fresh water that evaporates Very EXPENSIVE! Transport – ____________ (EX: Greek islands and tourists) – US consider water from Alaska to California – Towing ___________________(not efficient)