Qld floods have now claimed six lives

The death toll in the Queensland floods has risen to six with the discovery of a second body in the Lockyer Valley, west of Brisbane on Wednesday.

The body of a 34-year-old man was found in a car submerged in Sandy Creek at Glen Cairn, near Gatton, on Wednesday morning.

The body of a 25-year-old man was found nearby by police divers several hours later.

Their cars were swept off the road by floodwaters as the two men drove from Gatton to Mulgowie to start work at a farm at 5am (AEST) on Sunday.

Three other men have died in floodwaters and three-year-old boy died after a tree fell on him in Brisbane.

A young man who went missing while swimming in floodwaters at Maryborough was found alive.

Meantime, hundreds of soldiers are on their way to floodstricken Bundaberg, while Brisbane faces water supply dramas.

A convoy of 61 military vehicles carrying more than 200 soldiers is on its way from Brisbane to Bundaberg where about 2000 homes were flooded, many up to their roof tops.

The floodwaters are slowly dropping, but with so much water coming down the Burnett River it's expected to be some time before around 7500 residents can return home.

About 1200 people remain in official evacuation centres, with thousands of others bedding down with family and friends.

Defence Minister Stephen Smith says the defence force personnel will stay in Bundaberg for as long as they are needed.

Brisbane residents have been told to limit water use after flooding forced the shutdown of the city's main processing plant.

Premier Campbell Newman told reporters on Wednesday the Mount Crosby plant should be back up and running within 36 hours, but he warned some suburbs could run out of water before then.

He did not name the areas that would be affected but said the Brisbane City Council had drinking water ready to supply them.

Water coming into the plant at Mt Crosby is four times more turbid than what it was during the 2011 flood, he said.

Floodwaters are dropping slowly in Logan, south of Brisbane.

Logan Mayor Pam Parker says eight homes in Logan Reserve have had water through them, 7500 are without power, and about 200 residents in the suburb of Buccan are isolated.

A large body of water is heading towards the central Queensland city of Rockhampton with residents preparing for flood peaks to hit this weekend.

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