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Levees And Floodplains
 

Levees And Floodplains

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    Levees And Floodplains Levees And Floodplains Presentation Transcript

    • Floodplains&levees
    • What is floodplains?
    • Defination of a flood plain
      Adjacent to a stream or a river that experience periodic flooding
      A floodplain, is flat or nearly flat land
      It includes the floodway, which consists of the stream channel
    • How are Floodplains formed?
    • A river may overflow its banks during times of heavy rain.
      The river will deposit materials onto the flood plains when the water loses speed and recedes into the river.
      The heavier and coarser sediments are first deposited at the river’s edge followed by the smaller and lighter materials deposited at the outer edge.
    • Uses of floodplains
      Floodplains may be used by humans for growing crops
      As the silt deposited contains alluvium that is extremely fertile
    • What is levees?
    • Definition of a levee
      A levee, is a natural or artificial slope or wall to regulate water levels. It is usually earthen and often parallel to the course of a river or the coast.
    • How are levees formed?
    • river overflows it’s banks
      The excess water overflows into the flood plain
      When the water recedes sediments are deposited
      Smaller and lighter sediments are deposited further from the river
      Larger sediments are deposited nearer to the river to form levees
    • Heavier and larger sediments deposited to form
      the levee
    • Artificial levees may be constructed to prevent coastal floods and river floods.
    • Artificial levees may be formed temporary by using formed by using sandbags or permanent by earthworks
    • Levees were first constructed in the Indus Valley Civilization (in Pakistan and North India from 2600 BC)
    • credits
      http://www.answers.com/topic/levee
      http://en.wikipedia.org/wiki/Lev%C3%A9es
      http://science.howstuffworks.com/levee.htm
      http://architecture.about.com/od/damsresevoirs/g/levee.htm
      http://blog.nola.com/levees/2010/01/what_is_leveesorg.html
      http://www.knowledgerush.com/kr/encyclopedia/Levee/
      http://www.wisegeek.com/what-is-a-levee.htm