The National Capital Authority (NCA) will begin installing replacement anchor bolts at Scrivener Dam at the beginning of March.
The replacement anchor bolts will ensure that the dam's five flap gates will remain secured to the concrete dam wall. The flap gates are typically lowered during flood events to regulate the water level of Lake Burley Griffin.
NCA chief executive, Gary Rake said the works were identified during an annual safety audit and surveillance inspection of the dam in late 2011.
'The NCA became aware of corrosion issues related to the original anchor bolts in late 2011. During 2012 we conducted further engineering investigations, developed and documented a design, obtained the necessary statutory approvals and appointed a head contractor to undertake the works,' Mr Rake said.
'Replacing the 120 existing anchor bolts with 60 new bolts has required careful consideration to ensure the work is completed efficiently and with minimal impact on dam operations.
'The anchor system has been substantially redesigned to meet current design standards.'
'Completion of the works will ensure public safety is maintained and provide continued effective function of the anchor bolts for the next 100 years,' he said.
Lake Burley Griffin was lowered in late 2011 to assist in managing risks associated with both the day-to-day operation of the dam and the completion of these engineering works. It is anticipated the lake will remain at the current lower level throughout construction.
Minimal impact is expected on road users, pedestrians and cyclists, and nearby residents during the construction phase. Short-term temporary traffic and shared path management arrangements will occur infrequently, however these will typically occur outside peak periods. Careful attention is being given to minimise opportunities for potential environmental impacts.
The engineering works will commence on Friday 1 March 2013 and are anticipated to conclude in March 2014.
A fact sheet is attached outlining the scope of works in more detail.