Previous estimates have put the total damage bill at more than $1 billion including insurance claims and major infrastructure repair, and work is under way to establish the full financial impact.
"For an event that lasted just three days, it's going to have a big impact on our economy and on our budget," Treasurer Cameron Dick said on Sunday
There are still 140 people in evacuation centres and about 3000 homes without power, most of which are expected to be restored by Sunday night.
Communities around Ipswich and Gympie are still isolated, with roads expected to open on Monday.
'This has really packed a punch, these floods have had a big impact on people and it's going to take not just weeks but months for people to recover," Premier Annastacia Palaszczuk said on Sunday.
The state's $2.1 million donation includes $500,000 each to the Australian Red Cross, Lifeline, The Salvation Army and Vinnies, and another $100,000 to GIVIT.
Ms Palaszczuk said the organisations had a track record of getting money to where it's needed, and encouraged residents to give what they could.
"The last thing we want is money kept in a big bank account that doesn't get to the people," she said.
Mining giant BHP has donated $2 million to the relief effort in Queensland and NSW, Suncorp is kicking in another $1 million across both states, and Star Entertainment gave $200,000 to the Sunshine State.
Queensland's Mud Army has been stood down after an "incredible effort" following the floods, Brisbane City Council said.
"The Australian Defence Force and Council officers will continue clean-up activities around the city," it said in a statement.
"The safety of all volunteers, staff and the people of Brisbane is paramount, especially with further thunderstorms predicted and unstable weather conditions."
Police are urging residents to take care with storms predicted across the southeast on Sunday.
"It is still quite saturated and we will expect flash flooding, so please be patient," Commissioner Katarina Carroll said.
Severe thunderstorms are likely to produce damaging winds and heavy rainfall that may lead to flash flooding, the Bureau of Meteorology said on Sunday.
Areas that may be affected include Brisbane, the Gold and Sunshine Coasts, Gympie and Toowoomba.
Each of the state's 11 flood-related deaths were because people went into floodwaters, Ms Carroll said.
"Some definitely unintentional but certainly some people making really, really poor decisions," she said.
24°C