Prime Minister Scott Morrison says the Australian Defence Force is readying itself to help deal with the flooding in NSW.
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Mr Morrison told parliament on Monday the country was being "tested" by the crisis, also affecting parts of Queensland, and there could be worse to come.
A formal request for ADF help from the NSW government was expected on Monday, he said.
"We understand that this is likely to be for recovery support and cleanup operations including personnel, vehicles and machinery," Mr Morrison said.
It could also involve heavy-lift aerial support.
"The ADF is readying itself for this task that still lies ahead, particularly in the recovery phase," Mr Morrison said
Across NSW, 1400 SES personnel have responded to more than 7500 requests for assistance.
In southeast Queensland, more than 300 SES requests have been recorded.
The Bureau of Meteorology has issued a severe weather warning for western and southern Queensland, which could extend to the southeast coast on Tuesday morning.
Some parts of NSW are experiencing the worst flooding in at least 50 years, with evacuation orders in place for 28 areas and a further 16 issued with an evacuation warning.
The prime minister said there was a "serious risk still ahead".
"Heavy rainfall is likely to continue up much of the eastern half of NSW and into southern Queensland today and tomorrow," he said.
"Heavy falls will also develop over northern and central inland parts of NSW tomorrow, bringing the risk of flash and significant river flooding to several additional catchments."
Federal disaster recovery payments and allowances have been activated to support those who have been affected.
Mr Morrison said he was grateful there had been no lives lost so far.
Emergency Management Minister David Littleproud noted 780 rescues had been carried out in flooded areas, as he urged all affected people to take notice of warnings.
"We just say to people, this is your opportunity to lead and make sure that you do not get yourself in a situation where you are calling an emergency service person to come and save you," he told parliament.
Mr Littleproud said federal authorities would provide whatever help necessary.
"This is your hour of need and the Australian people will stand with you," he said.
Lyne MP David Gillespie had to isolate with his wife Charlotte on the weekend when flooding hit the NSW Central Coast.
Nationals leader Michael McCormack said Dr Gillespie had been able to get out on Monday and talk to local residents.
Australian Associated Press
