The curved arms of the New Waterway Storm Surge Barrier in The Netherlands swing out in a test. The walls of the barrier protect Rotterdam and other inland cities from flooding during large storms on the North Sea. Normally, the large, curved arms are retracted to allow ships from the North Sea to travel to ports along the New Waterway. When a dangerous storm is anticipated, the arms are swung out to block off the waterway and prevent large waves from pushing floodwaters inland.
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