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Wednesday 18th of December 2.26p.m. Windy, cold & sunny. Moderate 27.8 / 42.6kph SSW, Hg 41%, 21.6C / 70.9F. Windy. Partly cloudy.

Moon is 89%

South-east Queensland on track for wettest December in more than a decade​

8 hours ago​

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Low-lying roads like this one in Bald Hills have already seen flooding this summer. (Supplied: Josh Deitz)

The dams are spilling, the ground is sodden, and more rain is on the way for parts of Queensland, so is it time to fear another major flood event?

Flood expert Margaret Cook, from Griffith University's Australian Rivers Institute, suggests keeping an eye out for the ants and snakes in your area because if they start moving to higher ground, you should too, and quickly.

"We're not at the panic stage yet, but it is certainly an issue when the ground is so wet, when more rain comes and we get runoff, and of course we have already seen flooding," she says.

"You look at Brisbane hills and think this isn't a city that floods, but it's surprising what areas do flood.

"And sometimes they're not the areas near the river exactly."

Ms Cook says with the dams already conducting releases, residents should at least be on alert.

"We can learn from the past, and it is almost an advantage that the 2022 floods were not that far away," she says.

"Remember the local flood markers and remember what we wish we'd done last time.

"You know, clean our drains out, clean our gutters, get your battery-operated radio ready.

"People only panic when they've got no sense of control."

Dams spilling hundreds of megalitres​

Seqwater says even though the dams are spilling, Wivenhoe Dam, for example, only opened one gate for flood releases on Tuesday.

"We are well below concerning levels," general manager of service continuity Matt McCahon says.

"In all seriousness, the catchment is quite sodden at the moment, so our next steps will depend on the rain and the amount that falls.

"More significant rain events have the opportunity to fill the flood compartment quite quickly, and we're always working to keep that flood compartment as low as possible".

On track for wettest December since 2010​

This week, Lord Mayor Adrian Schrinner issued a stark warning that flooding over the summer could be as "catastrophic" as the record-breaking 2022 event.

His comments came after Brisbane was hit with an 81-millimetre rain bomb on Saturday and amid predictions of above-average rainfall throughout summer.

With more flooding already this week, the ABC asked a senior meteorologist at the Bureau of Meteorology, Felim Hanniffy, to explain how this compared to the lead-up to the 2011 disaster and the floods in 2022.

He says the south-east is on track for the wettest December since 2010, when 479mm of rain fell in a month.

So far this December, the region has recorded 301mm, with more to come over the next two weeks.

Mr Hanniffy explains the historic 2011 flood, which claimed the lives of 36 people, came after a succession of heavy rain events, so the ground never had a chance to dry out.

The damage was exacerbated by the 11th-hour release of millions of litres of water from Wivenhoe Dam after it reached 191 per cent of its water-storage capacity.

Mr Hanniffy says in 2022, the sodden ground did have time to dry out after huge deluges in the November and December before.

He says January was fairly dry with minimal flood risk, but then at the end of February Brisbane received 80 per cent of its annual rainfall in just three days.

The lingering system and record-breaking downpour quickly broke riverbanks, swamped roads, flooded homes in 30 suburbs and led to 13 deaths.

The damage bill was $2.5 billion.
 

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