When the risk of flooding arises, the movable gates of the Thames Barrier rotate closed, blocking the path of the surge tide.

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Keywords: arises, barrier, blocking, britain, civil, closed, control, diagram, engineering, england, figure, flood, flood-control, flooding, flow, gate, gates, great, illustration, illustrations, kingdom, london, movable, path, protection, risk, river, rotate, science, surge, thames, tidal, tide, tide., united, vertical, water