Thames Barrier closes for annual test before 200th operational closure

The Thames Barrier is a crucial flood defense system protecting central London from tidal flooding. It spans 520 meters across the river and has closed 199 times for flood defense, with a total of 613 closures including tests. The barrier consists of 10 gates, with the largest being 61 meters wide and weighing 3300 tons. These gates can be closed in 8 to 12 minutes. The barrier's use is expected to increase over time, with normal operations taking about 1.5 hours. However, in urgent situations, it can be closed in as little as 45 minutes.

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