The Queensland government says it's time to reconsider building public works on floodplains.

Deputy Premier Jeff Seeney says it could be necessary to rebuild infrastructure in different locations.

"We can't just keep replacing it every two years.

"We've got to give a lot of consideration to how we replace it to make it more able to withstand these sorts of flood events."

Some infrastructure, such as Gayndah's water supply plant, has only just been repaired after the 2011 flood disaster, he said.

Mr Seeney said serious thought has to be given to future planning decisions to make sure towns don't grow more into flood-affected areas.

He said well over 100 farms were washed away in central Queensland's citrus-growing Burnett region this week, which is in his electorate.

"Those agricultural industries have been decimated to an extent that is hard to comprehend," he told ABC radio on Thursday.

Entire dairy herds were washed away and fully stocked piggeries were submerged by water with horrific consequences when the Burnett River rose, Mr Seeney said.

"Thousands of miles of fencing lie ruined and tangled and twisted and all of that represents a formidable reconstruction task," he said.

The deputy premier says he has no idea how the agricultural industry will recover but intends to make sure his cabinet colleagues understand the extent of the destruction.