A new commission of inquiry into the deadly floods that hit Queensland's Lockyer Valley in 2011 is about to begin gathering evidence.
Premier Annastacia Palaszczuk announced in parliament on Tuesday that the government had heeded calls by the Grantham community to further investigate how a wall of water surged through their township four years ago.
Twelve people died on January 10, 2011, as the flood west of Brisbane tore homes from their foundations without warning.
Locals believe the excess rainfall over the previous week filled a quarry on a creek bend down-stream from the town of Helidon before bursting through an embankment and surging down Grantham's main street.
The Queensland Floods Commission of Inquiry, which wrapped up in 2012, found the quarry did not contribute to the disaster.
However an independent study commissioned by The Australian newspaper found there were several inconsistencies between evidence presented at the inquiry and the actual event.
Former solicitor-general Walter Sofronoff QC would chair the new inquiry, which will begin next week and is expected to be finalised by August 31.
Lockyer Valley Regional Council Mayor Steve Jones, who campaigned for the inquiry, said it would bring closure for people still struggling with the tragedy.
"There's a lot of people with broken hearts in this valley and we want answers for them," he said.
THE INQUIRY'S FIVE KEY TERMS OF REFERENCE:
* The impacts of man-made and natural features of the landscape which could have altered or contributed to the flooding.
* Whether the existence or breach of the Grantham quarry caused or contributed to the flooding.
* Whether the quarry had a material impact on the damage caused.
* Whether the breach of the quarry had implications for the evacuation of the town.
* How these matters were initially investigated and how eyewitness accounts were dealt with in the aftermath.
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