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The water here in Windsor near Sydney has not been so high for decades.
Days of heavy rain caused floods in the east of Australia.
Susan Byun, local resident
"It's the first time, I'm worried. We've moved our car. Now we're debating whether we should stay or go. We don't know."
According to rescue workers, hundreds of houses were damaged.
Several important roads were closed.
People have been brought to safety in parts of New South Wales.
There was a storm warning for a 900-kilometer stretch of coast.
Gladys Berejiklian, Prime Minister New South Wales
"Unfortunately, parts of the central north coast are experiencing a disaster of the
century."
New South Wales is Australia's most populous state - around eight million people live in the region.
Especially in the hinterland of Sydney, the rains were heavier than expected.
Dean Storey, New South Wales Civil Protection
"As of Thursday, our volunteers have responded to 7,000 calls for help and the numbers are increasing by the hour."
There have been no reports of fatalities so far.
The weather forecast does not bode well: Meteorologists fear that it will continue to rain heavily in the coming days.