River ThamesTerence Lam

Information of River ThamesLocation : southern EnglandLength : 346km (second longest in the United

Kingdom)Source :Thames HeadMouth :Thames Estuary, North SeaCities flow through : London , Windsor , OxfordAverage discharge : 65.8 m /s

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Importance of River Thames provide habitation, water power,

food and waterInternational trade & cultural

canter -acted as a major highway

Thames Barrier

Information about Thames BarrierWorld's second-largest movable flood barrierBuilt across a 520-metre wide stretch of the

riverTotal construction cost: around £534 millionLocation: downstream of central London

Reasons for building Thames BarrierPrevent London from flooding - A storm surge generated by low pressure in the Atlantic Ocean sometimes tracks eastwards past the north of Scotland -may then be driven into the shallow waters of the North Sea.

Rising of water levelsHistorical flooding - 1928 Thames flood

Thames Barrier in action

Design of Thames Barrierrotating gatesdivides the river into four 61 meter and two

about 30 meter navigable spansgates are hollowmade of steel (40 millimeters thick)20.1 meters high & weigh 3,700 tones (4

central gates)

Source:WikipediaBBC

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