Australian Defence Force members are due to arrive in Katherine, in the Northern Territory's north, on Monday after a request from NT Chief Minister Lia Finocchiaro over the weekend.
The flooding in Katherine is the worst in almost 30 years, with crocodiles sighted around town.
The number of homes and businesses affected is still being tallied, but the Insurance Council of Australia has declared it a significant event.
Vision of the Daly River community showed floodwaters reaching roof height, with Ms Finocchiaro saying the NT is still in an emergency response phase.
Record river levels have completely overwhelmed the community, reaching 16.38m at the police station by Saturday afternoon.
"We've been working really well with our federal counterparts through this response phase for this unprecedented flooding territory-wide," Ms Finocchiaro said on social media on Sunday.
"It's really important that continues into the recovery phase, and floodwaters haven't even subsided, but it's front-of-mind that we need to rebuild the Territory together."
Late on Sunday, federal Territories Minister Kristy McBain told ABC News the request for ADF assitance had been approved.
"We have now enacted additional ADF support in the Katherine region for clean-up," she said on Sunday.
"A number of members of RAAF Tindal Base have already been out helping the community in their own capacity. That will now be formalised through ADF channels."
Emergency services personnel from Victoria have also arrived to offer assistance.
While there's still an active weather event across the Northern Territory, the Bureau of Meteorology warns the focus of the more intense weather had shifted away from the top end.
Commander Sonia Kennon said an incident management team has been set up in Alice Springs to prepare for any issues in surrounding isolated areas.
"As we all know, there has been a lot of rain in all districts and Central Australia is saturated. It will only take a small amount of water for rivers to flow and flash floods to occur," Cmdr Kennon said.
"We don't need to panic, we need you to prepare. We ask you to top up your emergency kits and stay informed as the weather system develops."
Bundaberg is one of many Queensland communities in recovery mode after more than 350 homes and businesses were inundated by flooding.
A 51-year-old man who had disappeared into the flooded Burnett River from a houseboat in Sharon, next to Bundaberg, on Friday was found alive on Sunday.
The disaster has claimed the lives of two backpackers from China who drove off a bridge on their way from Brisbane to the rain-hit North Burnett region.
Rescues occurred at Mossman and Redlynch in Far North Queensland on Sunday morning after heavy rain caused flash flooding and river rises.
Major flood warnings were current on Monday morning for the Thomson River at Longreach, Upper Balonne River at Surat and Cooper Creek at Windorah.
Queensland Premier David Crisafulli said he Thomson River was rising incredibly slowly at Longreach, frustrating residents.
There are now 58 Queensland local government areas receiving assistance in response to the relentless rain and subsequent flooding that has swamped the state since Christmas.
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