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Is Flood Mitigation Finally In Sight?
Maree acknowledges that not all floods are impacted by spills from Warragamba Dam, but a plan to reduce the magnitude of those that do is overdue and desperately needed. A resident of Oakville for 24 years before moving to Pitt Town in 2022, Maree and her family, like so many, were surprised by the 2020 and 2021 flooding events. “My husband and I had gone for a walk and were down by Lynwood (Country Club) and we noticed the water had come up to the Stop sign. That had never happened before. Later, water flooded their driveway and isolated them and about 15 other houses. We had no warning, no idea,” said Maree, who asked the Post not to publish her last name. “The water backed up in McKenzie Creek and came around along Saunders Road and Old Stock Route Road. Normally, it would drain away, but because of the volume of water coming down the river after they released water from the (Warragamba) dam, it couldn’t get away,” she said.
According to data from the Reconstruction Authority, if this were to happen, it is estimated that 64% of floods currently reaching the 1 in 100 chance-per-year level at Windsor would no longer do so. Maree’s recollections are not unique. In the wake of the seventh flood in little more than three years and ongoing flooding concerns in the Hawkesbury region, the New South Wales Government is contemplating a significant policy shift to lower the full capacity of Warragamba Dam, a move aimed at mitigating the impact of future flooding events for residents in the Hawkesbury Nepean Valley. According to data from the Reconstruction Authority, if this were to happen, it is estimated that 64% of floods currently reaching the 1 in 100 chance-per-year level at Windsor would no longer do so.
Additionally, floods that still reach this level would be significantly delayed, allowing more time for preparation and evacuation efforts. “We’re looking at all potential changes – including dropping the maximum allowable level on Warragamba,” Premier Chris Minns said. “However, I can’t consider doing that until I supplement Sydney’s water supply in the meantime. So that’s not going to give us an immediate relief. It’s going to take a bit of time.” But for people like Maree, it is welcome news.
“It’s a brilliant idea. If they were to reduce the water capacity of the dam. I think it’s an achievable, economical, sustainable and relatively immediate solution,” she said. She said housing development surrounding Hawkesbury had changed the nature of flooding and made flooding worse. “Water running off from places like Box Hill, the Gables, and Marsden Park can’t get away when the river is in full flood, and the dam spills, causing it to back up on the flood plain,” Maree said. “Roads are now flooding differently to how they used to. They are not flooding in the same order, and I think surrounding development plays a role. If Blacktown and Baulkham Hills is draining water into the Hawkesbury, they should pay to ensure it drains away effectively,” she said. According to modelling undertaken by Infrastructure NSW, reducing Warragamba Dam’s full capacity by up to
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