Aerials show force from US dam
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Oroville Dam: Aerials show damaged overspill

More than 180,000 people in northern California have been told to evacuate after two overflow channels at the US's tallest dam were found to be damaged.

The 770ft (230m) high Oroville Dam is not itself at risk of collapsing, but its emergency spillway was close to caving in, officials said.

The excess water has now stopped flowing.

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