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13 Cards in this Set
- Front
- Back
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Name and locate the Mississippi delta |
The Mississippi delta is located at st Lewis at a confluence of 3 tributaries - the Missouri, Ohio and Mississippi. The Mississippi runs through 31 states and 2 provences of cannada. |
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How big is the drainage baison? |
It covers 1245m square miles |
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Where is its source and mouth? |
It's source is at lake itaska and its mouth is in the Gulf of Mexico |
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What were the physical causes of the Mississippi flooding? |
There was prolonged rainfall for 3 months, therefore the ground was saturated The flood defences that were in place were not strong enough to contain the flood Several places had already received 200% more rainfall than normal There was an increase in the amount of serface run off |
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How much rainfall fell in a 24 hour period? |
125-175mm of rainfall |
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Name some human causes of the Mississippi flood |
stone wingdykes- the river is dug deeper on one side do large ships are able to pass through. levees- clay and earth walls to increase river capacity Dams- 200+ built on majour tributaries straightened river channels-150 miles of meanders were taken out concrete river beds- to stop meanders |
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What did the us army corps of engineers do? |
to stop the mississippi floods happening they put 10 billion dollars worth of flood defences in (see other card) which costs a further 20 billion each year to maintain |
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What were some effects of the Mississippi flood? |
Homes and possessions were lost and damaged Approx 100000 homes were destroyed The force broke the man made levees forcing the water to come rushing out |
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How many people died in the Mississippi floods? |
47 people |
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What was the scale of the damage? |
20 million acres of water across 9 states |
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How many people had to be evacuated? |
54,000 people. |
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How much did the flood cost? |
15-20 billion dollars |
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How many tributaries were flooded? |
100 were flooded |
