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Great Britain, London, Thames Barrier, a movable flood barrier in the River Thames east of Central London, been operational since 1984. The barrier prevents the floodplain of all but the easternmost boroughs of Greater London from being flooded by exceptionally high tides & storm floods moving up from the North Sea. When needed, it is closed during high tide; at low tide it can be opened to restore the river's flow towards the sea.

The Thames Barrier spans 520 metres across the River Thames near Woolwich & protects 125 square kilometres of central London from flooding caused by tidal surges. It has 10 steel gates that can be raised into position across the River Thames. When raised, the main gates stand as high as a 5-storey building and as wide as the opening of Tower Bridge. Each main gate weighs 3,300 tonnes.

 

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Uploaded on March 20, 2017
Taken on April 26, 2013