It is akin to using tiny adjustments to the height of a dam to control a torrent of water.
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In two weeks' time, murky brown water will have backed up behind the dam to a height of 135 metres (440 feet) above sea-level.
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At the height of the flood, engineers feared a bridge on the Pawtuxet was going to collapse, taking with it a nearby dam, which in turn could have taken out another dam.
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