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27 Cards in this Set
- Front
- Back
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What fraction of the USA's water does the Mississippi river drain?
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⅓
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What country is the Mississippi river in?
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USA
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Where is the river located (N, E, S or W)?
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South-east
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What year did it flood in?
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2001
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How many people had to move when it flooded?
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4,400
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How much did the damage from the flooding cost?
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$13 million
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How did they make the river deeper?
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Raised leeves
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How high were the ____ that made the river deeper?
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15m
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How far did the ____ that made the river deeper stretch?
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3000km
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How did they make the river flow faster?
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By cutting through meanders
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How far did they make the river flow faster for?
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1750km
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How did they control the flow from the (main) tributaries?
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Dams
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Give one example of a controlled tributary. How many ____ is it controlled by?
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Ohio River
100 dams |
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How did planting trees help?
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They intercept some rainfall and stabilize soil.
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What is it called when trees are planted?
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Afforestation
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Give an example of one place were trees were planted.
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Tennesse Valley
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What is a "safe flood zone"?
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Where building has been restricted on floodplain areas.
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What happened to existing housing on a safe flood zone?
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It was bought by the county and demolished.
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Where were the existing housing on a safe flood zone?
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Rock Island
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How many people rely on the Mississippi river for their water supply?
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18 million
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Does the river still flood today?
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Yes
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What was partially blamed for the dangerous flash floods in 2001?
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Failed levees
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What happens when the river silts up?
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The river bed rises and some places end up below river level
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Give an example of a place which his now below the river level.
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New Orleans, Louisiana
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How far below the river level was the example of a place that is below the river level?
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4.3m
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Why will artificial fertilisers have to be used?
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Alluvium is no longer deposited by flooding
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What species of bird is becoming endangered as a result of its habitat being destroyed as a result of a lack of silt?
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Heron
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