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Water

Water. Resources, Use, Policy. Water. Quantity Sources & Distribution Hydrological Cycles & Ecosystem Health Patterns of use & recuperation Irrigation Dams. How Much Water is There?. Though most of the earth is covered by water, only 2.6% of all the water is freshwater

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Water

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  1. Water Resources, Use, Policy

  2. Water • Quantity • Sources & Distribution • Hydrological Cycles & Ecosystem Health • Patterns of use & recuperation • Irrigation • Dams

  3. How Much Water is There? • Though most of the earth is covered by water, only 2.6% of all the water is freshwater • If we scaled all the water on the planet to = 100 gallons then all the freshwater would = 9.6 teaspoons!

  4. Distribution of Water

  5. Freshwater Cycle

  6. Dynamic of Rivers and Ocean • Infiltration of seawater depends upon strength of freshwater current and volume • In summer season greater seawater penetration • In drought years, even greater penetration • E.g., saltwater wedge from Gulf of Mexico known to penetrate the Mississippii more than 200 miles

  7. Dynamic of Rivers and Ocean • Infiltration of seawater can have serious consequences for agriculture, ranching and drinking water • Exacerbated by human reduced flows in rivers and watersheds

  8. Flooding is beneficial! Removes salts from soils! Brings in new nutrients!

  9. Prevention of Flooding by dykes, levees, channelization, river diversion is expensive and usually leads to increased erosion downstream

  10. Humans Living in Flood Zones Missouri River 1993 Missouri River 1992 • Billions of $US spent annual on flood relief and insurance • Floods beneficial for agriculture • Farming yes, but permanent residences?

  11. Freshwater Usage

  12. Freshwater Usage

  13. Water for Products (virtual water)

  14. Water for Products

  15. Water in the West – The Colorado

  16. Water in the West – The Colorado

  17. Colorado R. Water is Siphoned Off

  18. Colorado R. Water & Agriculture • The Imperial Valley of California is one of the major producing regions of fruits and vegetables in the US

  19. Delta of the Colorado River: BONE DRY!

  20. Stress onaquifersWater shortage

  21. Irrigation • Takes water from rivers or aquifers • In US > 21 million hectares • Increased rate of water loss to evaporation • Costs do not include depletion of freshwater resources

  22. Depletion of aquifersOgallala AquiferShould we be irrigating the most arid lands in the USA???

  23. Soybeans require ca. 25 inches (=.64 m) of water when grown on arid soils • A hectare is 10,000 sq. m • each hectare of soybeans requires 6,400 m3 of water • 100,000’s hectares of soybean agriculture in arid western US (e.g., eastern Oregon, Nevada, Colorado, Wyoming, etc.)

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