AS Geography Flooding Case studies 2

Flooding case studies along with Hard engeneering

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Hard Engineering-Three Gorges Dam, China-1

  • Largest hard engineering project ever done on a river
  • Completed in 2009
  • Located on the Yangtze river in china, which has a long history of flooding
  • Dam will be used to generate electricity from hydroelectric power for central and eastern China (including the city of Shanghai,Pop. 13 million people)
  • The dam will reduce the flood risk for 15 million people and improve navigation along the river
  • Reservoir being the dam-660 km long and 1km wide
  • the dam itself was completed in 2006 is 2.3km long and 185m High
  • Costing $26 billion
  • Creation of the reservoir forced the resettlement of 1.2 million people from several cities, 11 district centre and over 100 villages to new settlements
  • These areas of new settlement runs along the Yangtze river and most people were moved as close as possible to there previous homes
  • Many cultural monuments have been lost as a result of flooding, including the Zhang-Fei temples
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Hard Engineering-Three Gorges Dam, China-2

  • Between 1998-2004 the amounted of sediment transported by the river fell by over 50%, increasing the erosion downstream.
  • Sediment will gather behind the dam and will require dredging
  • Afforestation is needed on the slopes of the drainage basin to reduce the amount of sediment washed into the river
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Soft Engineering: River Quaggy Restoration Scheme,

  • River Quaggy runs through Southeast London
  • Since the 1960's it has been heavily managed
  • Artificial channels and culverts were built to divert it beneath the ground surface as it passed through Greenwich.  This increased the flood risk due to continued Urban development in Lewisham also
  • Plan was to bring the river back above ground once again, cutting a new channel for it through Sutcliffe park.  Flood management and the quality of the park would therefore be improved.
  • A culvert remained to take some water underground during flood conditions, a new lake was created to take over when this was full.
  • The park was lowered and shaped to create a floodplain
  • The parks flood storage capacity of 85,000 m3, 35 Olympic swimming pool
  • This has reduced the risk of flooding to 600 homes and Businesses
  • The scheme won the Natural Environment category in 2007 Waterways Renaissance Awards
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