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.

What is the primary purpose of the Thames Barrier?

• To protect central London from tidal flooding

• To provide a scenic view for tourists

• To facilitate river traffic

• To generate electricity for London

How many gates does the Thames Barrier have?

• 5

• 10

• 20

• 15

What is the weight of the largest gates in the Thames Barrier?

• 1500 tons

• 3300 tons

• 5000 tons

• 7500 tons

How long does it typically take to operate the Thames Barrier under normal conditions?

• 30 minutes

• 45 minutes

• 2 hours

• 1 hour and 20 minutes

What is the fastest time recorded for closing the Thames Barrier?

• 60 minutes

• 30 minutes

• 45 minutes

• 15 minutes