Officials have described the downpour, which has lasted several days already, as a “one-in-a 50-year event”.
The heavy rain has caused rivers and dams near Sydney to overflow.
There is currently no sign of let up in the bad weather, with officials saying the rain could continue all week.
Prime Minister Scott Morrison told Sydney radio station 2GB on Monday: “It’s another testing time for our country.”
More to follow…….