This 2005 case study describes a new system for passing river traffic through the weir structure on the Murray River in time of flood. Built using steel, it permits lock operators to remove a section of the weir when the river is in flood. Vessels then pass through the weir, instead of though the lock chamber or over the fixed weir, in flood conditions. The new system of removable deck units and reduced height piers is alleviating risks for divers and allowing lock operators ease of installation/removal in flood waters by use of their existing rail cranes. Each lock and weir unit requires around 50 tonnes of steel to build and, when complete, around 550 tonnes will go into the new system. Steel Australia June 2005
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