FORECASTERS expect minor floods in the Brisbane and Bremer rivers, but Queensland premier Campbell Newman says it will be nothing like what happened in 2011.
If current projections play out, 3600 residential properties will be affected in Brisbane, Lord Mayor Graham Quirk said.
He said of those 2100 were unit dwellings, where the ground floor might be flood but upper levels would not.
"There would also be 1500 detached homes that would be impacted if that scenario were to occur," Mr Quirk said.
He said 1250 business properties would also be affected in Brisbane.
"This is not 2011. It is a much lesser event," Mr Quirk said.
Mr Newman said there would be minor floods in the Brisbane River, and in the Bremer River that flows through the city of Ipswich to the west of Brisbane.
He said flood maps would shortly be released by the Brisbane and Ipswich councils, with lists of affected suburbs.
"The peak of any flood will occur in Ipswich we believe around midnight tomorrow (Monday) night," Mr Newman said.
"Similarly the peak at the western side of the Brisbane City Council boundary will be about midnight on Monday night."
He said the worst of the projected flooding would be seen in the heart of Brisbane around noon on Tuesday, with another peak expected at noon on Wednesday.
"The flood levels projected will be much lower that what we saw in 2011," the premier told reporters on Sunday afternoon.
Mr Newman said flood peaks would be much less than what was experienced in 2011.
Brisbane is expecting a 2.6m flood peak, nearly half of the 4.46m peak in 2011.
The Ipswich peak is expected to be five metres less than the 19.4m in 2011.
"There will be flooding but the flooding is much much lower than what we saw in 2011," he said.
Mr Newman said the projections were based on the best scientific modelling by forecasters.
He said the projections may not eventuate, but authorities had a duty to share the information so residents of both cities could be as prepared as possible.
Mr Newman said that during the 2011 flood, he didn't feel people were given enough warning and he was determined to ensure that never happened again.
"If it doesn't occur, then I'm sorry in advance," the premier said.
"We want to give the communities in Brisbane and Ipswich, on the Brisbane and Bremer rivers, the best possible information as soon as it is available."
He urged people not to panic, but to check the flood maps and to prepare if they were in an area that might flood.
Mr Newman said there was flooding in the Lockyer Creek and the Bremer River which fed into the Brisbane River downstream of Wivenhoe dam.
"Those flows cannot be controlled by anybody," he said.
He said dams like Wivenhoe acted as "shock absorbers" do in cars.
"They are designed to take the impacts, the bumps out of the road. If you hit a small bump, you barely feel it. If you hit a great big bump, the impact really rocks you around.
"Dam managers are doing everything they can to take the shock out of the system and ensure we have the lowest possible levels in the Brisbane river."
Moggill is projected to be the first Brisbane suburb to be flood-affected on Monday afternoon.
Mr Quirk said predictions had worsened significantly late on Sunday.
"It's worse than what we would have thought at lunchtime," he told reporters.
"So the intensity of the rainfall in certain localities, the modelling that is now before us is indicating that the amount of water coming down from the west will result in flooding in the Brisbane River."
The premier said there was some good news - rainfalls are easing in the catchments of the Brisbane and Stanley rivers, which flow into Wivenhoe and Somerset dams.
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