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Any day now main contractor Balfour Beatty Costain will open the three small sluices in the sheet pile wall that forms part of the massive cofferdam around the central lock and sluice section of the Cardiff Bay Barrage. The 12 hour flooding operation will mark the end of a major concrete construction project in its own right, which will have seen more than 100,000m3 of high grade structural concrete poured in little more than 12 months.