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Freshwater

Freshwater. Selected info from C h 11 More information can be found in: T extbook Warm-ups Articles from class Webquests from class Activities done in class. Groundwater Recharge. Groundwater discharge/drawdown. Groundwater flows toward areas of discharge.

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Freshwater

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  1. Freshwater Selected info from Ch 11 More information can be found in: Textbook Warm-ups Articles from class Webquests from class Activities done in class

  2. Groundwater Recharge

  3. Groundwater discharge/drawdown • Groundwater flows toward areas of discharge

  4. Recharge – Discharge should = 0 • Too much discharge  ground subsidence

  5. Groundwater Contamination • Sources: • Pesticides and fertilizer • Industrial • Waste management • Leaky landfills • Septic systems and leaky sewers • Domestic (pollutants poured onto ground) • Salt water intrusion

  6. Groundwater contamination

  7. Groundwater contamination • Leaky fuel tank dug up from a gas station

  8. Salt water intrusion • Occurs in heavily populated coastal areas • Pulling water from aquifer causes salt water to flow into aquifer.

  9. Salt water intrusion solution • Deep well injection

  10. Georgia-Alabama-Florida Water Wars Whose Water is it Anyway? Population growth needs Power needs Oyster industry http://www.atlantaregional.com/environment/tri-state-water-wars

  11. California Aqueduct http://www.centralbasin.org/slideshow.php?set=mapCaliforniaAqueduct&ID=

  12. http://planetforward.org/idea/cover-the-california-aqueduct-in-solar-panels-to-double-down-on-energy/http://planetforward.org/idea/cover-the-california-aqueduct-in-solar-panels-to-double-down-on-energy/ http://www.photovalet.com/398081

  13. Water DiversionColorado River No Longer Gets to the Gulf of California All of the water is allocated along the way in a series of documents called “The Law of the River” Seven States are involved. http://www.usbr.gov/lc/region/g4000/contracts/watersource.html

  14. Drought + population growth =lose/lose More irrigation needed Less water available Traditional sprinkler systems Is there a better way?

  15. Water Conservation

  16. Global Water Use • Agriculture – biggest except in Europe • 67% • Industrial • 19% • Greatest use is to cool power plants • Return water is warmer, but can be reused • Residential • 14%

  17. Water Impoundment • a dam on a river forms a reservoir • Benefits: • Recreation • Hydroelectric power • Potable Water supply • Flood control • Irrigation • industry http://www.pbs.org/itvs/greatwall/dam1.html

  18. Impoundments: dams and reservoirs • Harms • Habitat destruction • People displaced • Lost wilderness • Blocks sediment renewal downstream • Siltation (behind dam) • Blocks natural aquatic migration • Dam failure http://adventure.howstuffworks.com/outdoor-activities/fishing/fish-conservation/fish-populations/fish-ladder1.htm

  19. Desalination • Evaporate salt water and condense evaporate to get freshwater • Takes LOTS of energy • Suited to Middle East • High energy supply • Low humidity • Lots of salt water! http://ga.water.usgs.gov/edu/drinkseawater.html

  20. Water Treatment • Potable = drinkable • Pathogen = “germs” • Bacteria • Viruses • Protozoa • Parasitic worms

  21. Wastewater Treatment

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