WATER RESOURCES

What do we use water for? AGRICULTURE INDUSTRY DOMESTIC 25 bathtubs full 37 gallons 2,400 bathtubs full 40 gallons per person per day

Who uses the most?

Water Usage 70% AGRICULTURE Most wasted – evaporation, seeps before plants absorb 20% INDUSTRY Energy production, manufacturing, etc. 10% DOMESTIC Cities and residences Largest domestic use – toilets

Little Water Available Most water is oceans/saltwater - ~97% ~3% freshwater Only 0.024% usable Liquid, accessible groundwater, surface water Rest is frozen in ice caps or glaciers, too deep to extract, or polluted

Fig. 13-6, p. 319

Fig. 13-5, p. 318 Substantial conflict potential Highly likely conflict potential Unmet rural water needs Moderate conflict potential Washington Oregon Montana North Dakota Idaho South Dakota Wyoming Nevada Nebraska Utah Colorado Kansas California Oklahoma New Mexico Texas Arizona

HOW IS WATER RECYCLED?

WATER CYCLE

Can you name the processes? sci.ess.watcyc.watercycle/

Currently there are ~30 armed conflicts over water Southwest: Blue Gold Movie:

Why is water an issue? Population & water resources –don’t always match Canada vs.China 0.5% world’s pop’n20% pop’n 20% world’s freshwater7% freshwater Precipitation – key distributor (droughts and floods) Water Wars – who owns the water? “Whiskey is for drinking. Water is for fighting over. - Mark Twain

Water Issues Freewrite Thinking about the issues we investigated… Do you think the next world war might be fought over water? Why or why not? What is a solution to help prevent these conflicts?

Water stressors Population & water resources –don’t always match Canada vs.China 0.5% world’s pop’n20% pop’n 20% world’s freshwater7% freshwater Increased surface water and groundwater withdrawal Increased waste Farmers and cities competing for water less access to water, yet feeding 82M more people every year