An evacuation order has been issued to residents of towns along the Hunter River in NSW as rising floodwaters threaten power and water services.
People along within the Whittingham, Scotts Flat, Glenridding, Dunolly, and Combo areas had to evacuate the high danger area by 7 pm on Saturday, the State Emergency Service said.
Widespread heavy rainfall led to flooding across much of the state.
The statewide situation remains volatile, with numerous watches and warnings active following a month of heavy rainfall.
More than 30 people have been rescued from floodwaters since Friday lunchtime.
In the central west, Eugowra residents are being told to prepare to evacuate as water levels rise along Mandagery Creek.
Canowindra near Orange is on alert with major flooding possible on Sunday morning.
In the Hunter, major flooding is still on the cards in Singleton, and Maitland is also on alert.
On Monday, the Macquarie River at Warren could also reach major heights.
Areas of major concern include along the Namoi River at Gunnedah, in the state's northeast, and the Castlereagh River around Coonamble in the central west.
Residents are being urged to check their local council websites to monitor Disaster Dashboard updated information.
The Bureau of Meteorology said some areas of the state were hit with more than 100mm of rain on Friday.
On Saturday evening, there were major flood warnings for the Lachlan at Jemalong and the Namoi at Narrabri and Wee Waa, where it's feared residents could be cut off for more than a week.
Sydney's Warragamba Dam began spilling shortly after 9 pm on Friday.
WaterNSW said the outflow volume could peak at a rate of about 60-80 gigalitres per day, just a fraction of levels in March that peaked at 500 gigalitres per day.
"On current projections, the spill could continue for up to a week," WaterNSW said in a statement on Saturday, adding "downstream impacts are likely".
A flood watch is in place for the Hawkesbury Nepean Valley in western Sydney.
Premier Dominic Perrottet on Saturday urged residents to follow safety advice and avoid driving through flooding,
Images: Hunter Police