Mississippi Floods, 1993.
When and Where <ul><li>The summer of 1993 </li></ul><ul><li>Mississippi River, USA – </li></ul>
 
Scale <ul><li>Image is 185 km across, north is in the top left corner. </li></ul>
<ul><li>Causes of the flooding: </li></ul><ul><li>Higher than normal rainfall during first half of 1993. </li></ul><ul><li...
Agricultural and Residential Damage
Commercial Damage and Other Effects <ul><li>150 levees collapsed under the pressure of the water. </li></ul><ul><li>Dams b...
Urban
Rural
Communication
Residential
Community Action
Flood Protection
Clean Up
Mud
Hose Down
Drinking Water
Homeless
Failed Crops
Valmeyer, Illinois
<ul><li>Modification of the Mississippi: </li></ul><ul><li>80% of wetlands drained since 1940’s </li></ul><ul><li>River ch...
Human Impacts
River Engineering
 
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IB Geography: Drainage Basins: Mississippi Floods

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IB Geography: Drainage Basins: Mississippi Floods

  1. 1. Mississippi Floods, 1993.
  2. 2. When and Where <ul><li>The summer of 1993 </li></ul><ul><li>Mississippi River, USA – </li></ul>
  3. 4. Scale <ul><li>Image is 185 km across, north is in the top left corner. </li></ul>
  4. 5. <ul><li>Causes of the flooding: </li></ul><ul><li>Higher than normal rainfall during first half of 1993. </li></ul><ul><li>Individual storms frequently dumped large volumes of precipitation that could not be accommodated by local streams. </li></ul><ul><li>The ground was saturated because of cooler than normal conditions during the previous year. </li></ul><ul><li>The river system had been altered over the previous century by the draining of wetlands and the construction of levees. </li></ul>
  5. 6. Agricultural and Residential Damage
  6. 7. Commercial Damage and Other Effects <ul><li>150 levees collapsed under the pressure of the water. </li></ul><ul><li>Dams burst. </li></ul><ul><li>Bridges closed. </li></ul><ul><li>48 people killed. </li></ul><ul><li>70,000 people evacuated from their homes. </li></ul><ul><li>Final damage cost estimated at $10 billion. </li></ul><ul><li>Over 25% of the crops were lost. </li></ul>
  7. 8. Urban
  8. 9. Rural
  9. 10. Communication
  10. 11. Residential
  11. 12. Community Action
  12. 13. Flood Protection
  13. 14. Clean Up
  14. 15. Mud
  15. 16. Hose Down
  16. 17. Drinking Water
  17. 18. Homeless
  18. 19. Failed Crops
  19. 20. Valmeyer, Illinois
  20. 21. <ul><li>Modification of the Mississippi: </li></ul><ul><li>80% of wetlands drained since 1940’s </li></ul><ul><li>River channel constrained by levees and floodwalls. </li></ul><ul><li>Levees had not been built high enough to cope with this level of flood (a 1 in 100 year event). </li></ul><ul><li>Reservoirs had been built on the tributaries to store floodwater but not on main river as it would halt transportation. </li></ul><ul><li>Channelisation – deepening, widening, straightening, lining. </li></ul>
  21. 22. Human Impacts
  22. 23. River Engineering

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