Water World Case Studies

The Sahel
1. Rain falls in 1 or 2 months of the year
  1. Total rainfall between 250-450mm
2. Impacts of drought
  1. Subsistence farmers can't grow crops
  2. Seasonal rivers and water holes dry up
    1. Water table falls
  3. Soil erosion and desertification
Water Aid in Malawi and Bangladesh
1. NGOs set up low-cost projects using intermediate technology
  1. Small scale
    1. Helps a small community
      1. Continue with management when NGO involvement ends
  2. Hand dug or tube wells
    1. Clean water
  3. Sanitation blocks - toilets ans water for washing
  4. Eco-san latines
    1. Covered toilets
Colorado Dam
1. Costs
  1. $850 million to build
  2. Almost no water reaches sea - Mexico's water has been reduced
  3. River ecosystem has declined
  4. States and cities argue over who gets the water
  5. Water levels reached a record low in 2010
    1. Global warming could reduce it further
2. Benefits
  1. Supplies Las Vegas and other cities and farms in California with water
  2. Water supply is clean, low cost and reliable
  3. Popular tourist attraction
  4. Generates 2 gigawatts of electricity
  5. Popular place for recreation and fising
Three Gorges Dam
1. Benefits
  1. Stops devastating flooding on the Yangtze river
  2. Generates 22.5 gigawatts of electricity
  3. Water supply to people nearby is reliable
  4. Can be navigated far inland
2. Cost
  1. $26 billion to build
  2. Increasingly dirty and polluted by industry
  3. Over 1 million people had to be relocated
    1. Reservoir flooded
  4. Many ancient monuments were flooded
  5. Destroyed some animals habitats

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Water World Case Studies

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	Created by cesci_bell almost 11 years ago