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STORY: A man was found dead after his vehicle was swept away by floodwaters in the city's southwest, police said, while roads were submerged and homes and businesses inundated. More than 4,000 residents are facing flood evacuations.

"Whilst the rainfall has started to ease in most places, we do expect to see those river levels continue to rise for some time before they start to ease back over the next 12 to 24 hours,” New South Wales emergency services Acting Commissioner Daniel Austin told a media briefing.

Australia's east coast has been hammered by three separate wild weather patterns in the past six weeks with several regions still battling to clear tons of debris after devastating floods submerged entire towns. The torrential rain has raised the risks of flash flooding and landslips, with Sydney having already received more than its average annual rainfall.