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The proposed project will see the dam wall height raised, which will increase the Full Supply Level by 10 metres. "WaterNSW have been able to bring Wyangala down to 95 per cent over the last week, but we face another forecast rain event over the next few days so there's a fair bit of anxiety out there now." The Wyangala Dam Wall Raising project is expected to increase the dam's capacity to hold an additional 650 gigalitres, which will increase capacity by 53 per cent.
Raising the dam wall will greatly reduce the chances of an event like this occurring again. "Here in the Lachlan Valley, NSW Water has had to release similar amounts of water from Wyangala Dam as the Burrendong dam inflows, creating major flooding as water also entered from downstream tributaries at the same time.
"Burrendong dam was full at the start of the last rainfall event but the flood storage section of the dam has held back hundreds of thousands of megalitres of water to see only a minor flood across the Macquarie Valley from downstream tributary inflows," Mr Green said. Lachlan Valley Water chair, Tom Green, says what we are seeing in the Macquarie system at the moment justifies raising Wyangala Dam wall and creating a flood mitigation section within the dam. Moderate to major flooding is occurring around Forbes and Jemalong as flood waters make their way down the Lachlan River from the recent rain events. The current flood crisis being felt by many farmers and people in towns along the Lachlan River Valley may have been avoided if a flood mitigation section was constructed at Wyangala Dam, and Lachlan Valley Water is shining a spotlight on the call to raise the wall.