The repair works will see the installation of a temporary coffer dam upstream of the regulator that will separate the inlet regulator from the broader Torrumbarry weir pool and allow the structure to be dewatered for repair.
WaterNSW executive manager operations Ronan Magaharan said the Koondrook-Perricoota inlet regulator had demonstrated ongoing structural concerns since 2014, which in recent years has impacted its maximum flow rate capacity.
“We’ve had ongoing monitoring on the KP inlet regulator and our recent dam safety inspections have shown elevated risks of a potential piping failure, so it’s necessary that we take the structure offline for repair,” Mr Magaharan said.
“Procurement is under way for the design and construction of a temporary coffer dam that we estimate will be in place by early next year.
“There is no immediate risk to the community, however it is important that we act now to maintain the integrity of the structure and the Torrumbarry weir pool.
“The temporary coffer dam will ensure the integrity of the weir pool is maintained, while providing safe access to the structure for repair works to be completed."
MDBA general manager assets Angus Paton said the Koondrook-Perricoota inlet regulator was important to control flows from the Murray River that enter the channel used to periodically flood and dry the Perricoota and Koondrook forests.
“This regulator is one of more than 3000 structures across the Murray-Darling Basin that we use to manage flows and get water to the places and people who need it,” Mr Paton said.
“Once the coffer dam is installed, and until the Inlet Regulator is repaired, environmental water will not be able to be delivered to Koondrook-Perricoota Forest via the inlet channel and regulator.
“It’s important that we maintain these river assets in safe working order.
“The MDBA will continue to work with Basin governments to plan and prioritise the forward budget necessary to maintain, repair and replace priority structures, such as the Koondrook-Perricoota inlet regulator.”
The timeframe for remediation of the inlet regulator itself is still to be confirmed and subject to funding and approval by Ministerial Council.
Once construction of the coffer dam commences, updates will be provided via the WaterNSW website - https://www.waternsw.com.au/.
