Alguns Kilomentros depois de East India esta a Barreira que controla o niveo do Rio Tamisa. http://en.wikipedia.org/wiki/Thames_Barrier Thames Barrier From Wikipedia, the free encyclopedia Coordinates : 51.497744°N 0.036679°E This article needs additional citations for verification . Please help improve this article by adding reliable references . Unsourced material may be challenged and removed . (July 2009) River Thames Flood Barrier The gate in the middle of this view has been raised to the maintenance position; a barge can be seen in the foreground. The Thames Barrier is a large flood control structure on the River Thames , constructed between 1974 and 1982 at Woolwich Reach, and first used defensively in 1983. [ 1 ] It is the world's second largest movable flood barrier (the largest is the Maeslantkering in The Netherlands ). Located downstream of central London, the barrier's purpose is to prevent London from being flooded by an exceptionally high tide moving up