In 2012-13, we commissioned an independent review of our 26 referable dams, which found improvements are needed at a number of our dams to meet the Queensland dam safety guidelines into the future.
We have prioritised a program of dam upgrades in a staged approach to give us time to scope, design and plan, while maintaining public safety, security of water supply and delivering best value for money.
Cooloolabin Dam upgrade
The assessment at Cooloolabin Dam identified a significant upgrade (about $28 million) would be required to meet the relevant dam safety guidelines. We have prioritised a program of dam upgrades in a staged approach to give us time to scope, design and plan, while maintaining public safety, security of water supply and delivering the best value for money.
As a short term solution, the water level at the dam was lowered in 2013. In late 2015, a slot was cut in the centre of the spillway to maintain this lower water level and delay the need for a significant upgrade.
Lowering water levels is an industry-accepted practice to best manage the safety of dams either temporarily or in the long term. Lowering the water level in a dam reduces water pressure and loads on the dam wall, and can also create temporary storage to increase its capacity to mitigate floods.
In October 2017 we started work to upgrade Cooloolabin Dam, as part of Seqwater’s Dam Improvement Program.
The upgrade involves construction of a filter buttress to reinforce the embankments on either side of the dam’s spillway and the lower part of the largest saddle dam.
The work is expected to be complete in April 2019, subject to weather and other unforeseen delays
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