Farms are being wiped out in Victoria as a sea of water makes its way further into the north-west corner of the state.
Officials says the sea of floodwater is estimated to be 90 kilometres long, and will spread across the state over the next 10 days.
Landholders are trying to save what they can on farms, livestock and machinery to higher ground.
Residents between Kerang and Swan Hill face a tense wait as floodwaters threaten properties there, and many are being warned they could be isolated for days.
Meanwhile, the Queensland authorities say the cleanup of the Lockyer Valley, west of Brisbane, is being hampered by a lack of civil construction expertise.
The area was one of the worst hit in the recent floods, which have claimed more than 30 lives since late November.
The local Federal Member Scott Buchholz said one of the biggest needs in the Lockyer Valley was for men and women who can drive heavy earth-moving machinery such as excavators.
On Sunday, forensic scientists were trying to identify what is believed to be human remains found in the flood-hit Lockyer Valley town of Murphy's Creek.
Police were also investigating what is believed to be more human remains at Lowood in the Brisbane Valley.
Queensland Premier Anna Bligh has confirmed that the flood death toll since 30 November is 33, with nine people still missing.
In Brisbane, Australian navy divers working in the Brisbane River were using special shark repelling equipment to protect them from attacks. The divers have been surveying the waterway to prepare for clearing hazards from the path of boats.
The Australian Government has set up a taskforce to investigate fraudulent flood claims after reports that some Queenslanders have been dishonestly claiming special assistance payments.
About $A200 million has been paid out to more than 250,000 people affected by recent flooding across Australia, the ABC reports.
