- Created by: OrlaghMarie
- Created on: 10-05-14 14:17
- Longest river in the USA - 2340 miles.
- 4th longest river in the world.
- 3rd largest drainage basin in the world.
- Source - Lake Itasca, Minnesota.
- Mouth - Gulf of Mexaco, New Orleans.
- Flows through 10 states.
- 18 million people/50 cities rely on it.
- Ohio and tennessee rivers rise in the Appalachians, receive heavy rainfall between Jan-May
- Flood risk increased from snow melt.
- Lower mississippi has most frequent floods.
- On 12th July 1993, the river St. Louis reached a height of 43 feet.
- Levees burst as pressure of water became to great.
- River remained at flood stage at St. Louis for 144 days.
- 150 levees collapsed.
- Dams burst, bridges were closed.
- By mid July 100 tributaries flooded.
- 50 people killed
- 62,000 families evacuated
- 55 towns wrecked
- £12 billion worth of property was destroyed
- Valuable transport infastructure affected.
- River traffic halted for several months (oil, cereals, coal could not be transported.)
- Ground was too wet for planting crops.
- Insurance claims were high
- 26,000km sqaured land flooded.
- Took several months for the water to drain off the land
- Threat of disease from sewage been washed into waterways
- Water attracted mosquitoes and rats, led to water borne diseases like Hepatitis.
- In 2001 the river flooded again.
- 4,4000 people evacuated and the damage cost £13 million.
Hard engineering management strategies
- Levees -…