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Milton drain last major device in backflow program

12 June, 2014

Milton drain last major device in backflow program

Lord Mayor Graham Quirk is today inspecting progress on the Milton drain system which is the largest and last major device to be installed in Council’s backflow program.

The Lord Mayor said his backflow program would see $14.9 million of vital flood mitigation work completed to help protect Brisbane residents from the risk of backflow flooding.

“The backflow program is part of my commitment to delivering effective flood mitigation measures across the city to help reinforce Brisbane against natural disasters,” Cr Quirk said.

“The roll-out sees 43 devices installed in 15 stormwater systems across the city, in suburbs such as New Farm, Milton, Chelmer, West End and surrounding areas.

“This will help protect the equivalent of around 80 per cent of properties that were affected by river flooding in January 2011, which is equivalent to 1500 properties.

“The program was accelerated to see it delivered two financial years sooner than originally anticipated, reflecting my administrations resolve to get on with the job of delivering flood mitigation measures for local communities.”

Local Government, Community Recovery and Resilience Minister David Crisafulli said the $3.1 million Milton drain device, which received $500,000 of State Government funding, would protect up to 452 local properties in Milton, Rosalie and Auchenflower, including Milton School.

“The Newman Government is working with local councils to better prepare communities for natural disasters as we strive to make Queensland Australia’s most resilient state,” Mr Crisafulli said.

“While we will never flood-proof Brisbane we can always do better and this project will give greater protection to local residents and business owners who suffered in 2011.”

Cr Quirk said the Milton drain device would be the largest device installed as part of his backflow program, and was one of the largest penstock devices installed in Australia.

“Milton Drain is an open storm water system which opens directly onto the Brisbane River, which is why its backflow device is so unique,” Cr Quirk said.

“It features a 5.9 metre wide by 3.6 metre tall dual-leaf penstock device to help prevent backflow river flooding, a 6 square metre flood sealable door to protect access to the walkway and two 5 square metre flap gates to provide a failsafe if the penstock fails to open after a flood event.

“The device will be fitted on a 9 metre high concrete structure stretching from the bottom of the drain all the way to the top of Coronation Drive, and is designed to withstand a 7 metre water load.

“Around 500 tonnes of concrete will be used in construction, with the door weighing in at nearly six tonnes.”

The Milton drain door is custom designed and manufactured in Australia and is constructed to manually slide and lock into place as the river level rises. Once activated, it will take approximately 15 minutes to close.

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