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Water World
- Small-scale management
- Wells
- Dug to reach underground water
- Lined with concrete and have a concrete
lid to prevent sewage from getting in
- Dug to reach underground water
- Hand pumps
- More efficient way of reaching groundwater
- Less chance of contamination
- More efficient way of reaching groundwater
- Water barrels
- Collect rainwater from gutters
- Water can be stored for use in times of drought
- The water stays
clean in the barrel
- Collect rainwater from gutters
- Wells
- Large-scale management
- The Three Gorges Dam
- Negatives
- Good farmland was lost
- 1.3 million people forced to move
- Landslides
- Cultural and historical sites lost
- Expensive ($2.25 billion)
- Downstream areas more susceptible to flooding
- Sediment builds up behind dam
- Important wetland areas destroyed
- Good farmland was lost
- Positives
- Flood risk along Yangtze reduced
- Water can be used for irrigation
- Hydroelectric power
- Less greenhouse gas emissions
- Yangtze is more navigable
- Flood risk along Yangtze reduced
- Negatives
- The Colorado River
- Positives
- Regulates the flow of water, reducing flood risk
- Dams generate electricity
- Lakes which form store water for irrigation
- Stored water can be used to supply growing cities such as Las Vegas
- Year-round supply of clean water for local US cities
- Regulates the flow of water, reducing flood risk
- Negatives
- Land is lost when it floods behind the dams
- Sediment builds up which affects HEP generation
- Less sediment flowing down the river disrupts local fish habitats
- Sandbanks have shrunk so animal habitats are affected
- Less sediment flowing down the river disrupts local fish habitats
- Less water downstream for Mexico
- Land is lost when it floods behind the dams
- Managed on a large scale
- Positives
- The Three Gorges Dam
- The hydrological cycle
- Climate and water supplies
- Why supplies are unreliable
- There may be dry and wet seasons
- e.g. the Sahel - has short wet seasons
- e.g. the Sahel - has short wet seasons
- Weather cycles can cause a number of dry years followed by a
number of wet years
- Global warming - causes dry areas to become drier and
wet areas to become wetter
- There may be dry and wet seasons
- South-west USA
- Less water
- Less irrigation
- Fewer crops
- Causes problems for growing population
- Causes problems for growing population
- Fewer crops
- Less irrigation
- Less water
- Why supplies are unreliable
- Threats to the hydrological cycle
- River pollution
- Untreated sewage pumped into rivers
- Management - sewage is
treated before being pumped
out
- Management - sewage is
treated before being pumped
out
- Eutrophication
- Management - regular fertiliser use
- Management - regular fertiliser use
- Factory chemicals
- Management - factories get remove waste products fro the
water before returning it to the river
- Management - factories get remove waste products fro the
water before returning it to the river
- Plastic bags
- Management - recycling centres
- Management - recycling centres
- Untreated sewage pumped into rivers
- River pollution
Recursos multimedia adjuntos
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