River Mississippi Case Study

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  • Created by: Chloe
  • Created on: 04-04-13 21:20

River Mississippi

Facts and figures

  • Drains over half of America
  • $1 millionworth of damage to the dam
  • It would flood every spring
  • Over 2,000 miles long
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Strategies to reduce flooding - Hard engineering

  • Winged dykes - narrowing the river (deepening it)
  • Built levees
  • Dams at the tributaries
  • Shortened it by cutting off the meanders
  • Lined the river with concrete
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Soft engineering

Moving people off the floodplain - Valmeyer

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Strategies to improve navigation

  • Winged dykes
  • Deepened 9ft
  • Cutting off the meanders
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Causes of 1993 flood

  • Rain- broke dams, levees - made the floods bigger - water goes up instead of out
  • They did not protect themselves for such a lot of rain- levees couldn't hold it
  • Rained for 3 months
  • Urbanisation on the floodplain
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Explain why some people think river engineering in

That all of the engineering raise the level of the river, If the levees break, it makes the flood worse - increased the power of the water- more efficient- more power/faster.

Winged dykes- Increasing the velocity

                       -Increases the risk of flooding downstream

                       -Increase energy level

Removing meanders -Increase of velocity

                                  -Increases the erosion (creates more meanders)

Concrete - Increases the velocity

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What would the environmentalists like to be done t

  • Return rivers to their natural state, letting the flood plains be free of houses and let it flood.
  • Getting people off the the floodplains
  • Put back the wetland and marshes
  • Get rid of winged dykes and levees
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