WATER RESOURCES. Little Water Available Most water is oceans/saltwater - ~97% ~3% freshwater Only 0.024% usable Liquid, accessible groundwater, surface.

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Presentation transcript:

WATER RESOURCES

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 tube.com/watc h?v=HW5eBfZ hE4M

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/Irrigation Most wasted – evaporation, seeps before plants absorb 20% Industry Energy production, manufacturing, etc. 10% Domestic Cities and residences Largest domestic use – toilets

Web Resources Water used to make different products: Global Water Footprint: Water Use game: Calculating Personal Water Footprint: Water Crisis News: Water conservation: environment/green-home-makeover/conserve-water-greenguide/ environment/green-home-makeover/conserve-water-greenguide/

Water Issues Articles 1. Make an appointment with 4 different people (3o’clock, 6, 9, 12) 2. Read your article 3. Summarize the main points/facts in your lab notebook 4. Meet, share your summary and write down theirs

WHAT MAIN WATER ISSUES DO WE FACE?

HOW IS WATER RECYCLED? HOW IS WATER RECYCLED?

WATER CYCLE

WATER ( Hydrologic ) CYCLE It is a “redistribution” of water. A drought somewhere = more water somewhere else

Transpiration

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

Surface water and groundwater are connected Most groundwater eventually flows into rivers, lakes, estuaries Disruptions to groundwater, affects surface water Overdraw groundwater  dry out groundwater  surface water drains into aquifer, drying out lakes, rivers, wetlands, etc.

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

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

Water stressors Freshwater withdrawal Withdrawal increased 7x 2/3 of annual surface runoff in rivers and streams is lost by seasonal floods Groundwater withdrawal Ogallala aquifer Increased waste Farmers and cities competing for water less access to water, yet feeding 82M more people every year

Freshwater in the U.S. We have plenty of freshwater, BUT not evenly distributed. East – ample rain, West and Southwest – little

Rain Shadow

Fig. 13-6, p. 319