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THE THAMES BARRIER is the world's second largest movable flood barrier and is located downstream of central London. Its purpose is to prevent London from being flooded by exceptionally high tides and storm surges moving up from the sea. It needs to be raised (closed) only during high tide; at ebb tide it can be lowered to release the water that backs up behind it.

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  • Uploaded on March 13, 2011
  • © All Rights Reserved
    by Susana Harrison