Mississippi river case study Flashcards

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1
Q

How long is the Mississippi river?

A

3,734 km

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2
Q

How many people had to move when the river flooded?

A

4,400

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3
Q

Where is it located?

A

South-East

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4
Q

How much damage did it cost when it flooded?

A

$13 million

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5
Q

How did they make the river deeper?

A

Raised levees

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6
Q

How high were these levees?

A

15 metres

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7
Q

How far did the levees stretch?

A

3000km

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8
Q

How did they make the river flow faster?

A

They cut through meanders.

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9
Q

What fraction of the USA’s water does the Mississippi river drain?

A

A third.

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10
Q

How far did they cut through meanders for?

A

1750km

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11
Q

How did they control the flow from the (main) tributaries?

A

Built dams

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12
Q

Give an example of a main tributary; how far did they control it for?

A

Ohio river

100 Dams

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13
Q

How did planting alot more trees help?

A

Increased interception and stabilised soil.

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14
Q

What is it called when trees are planted?

A

Afforestation.

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15
Q

Give an example of where trees were planted.

A

Tennessee Valley

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16
Q

What is a ‘safe flood zone’?

A

Where building has been restricted or stopped in a flood plain.

17
Q

What happened to the existing houses on the floodplain?

A

It was bought by the county and demolished.

18
Q

How many people rely on the Mississippi for their water supply?

A

18 million.

19
Q

What is the source of the Mississippi?

A

Lake Itasca

20
Q

How big is the drainage basin?

A

2.981 million km²