at rance in france,a tidal power station was completed in 1967.When the tide is in a pool is formed behind the barrage.This has an area of 2.2 times10 to the power of 6 m.The barrage across the estuary contains 24 turbines which generate electricity as the water flows out to the sea.if the water behind the barrage rises an average of 8 metres after high tide calculate the volume of water trapped by the barrage.
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