Governments and planning authorities learned a good lesson from the 2011 floods, but experts say the 2022 flood has exposed how limited that solution was.
Experts believe much of the water that inundated suburbs such as Chelmer was stormwater runoff, rather than water coming up from the Brisbane River, which was held at bay by backflow prevention devices.However, that is small comfort to residents near the river who saw the water rise anyway, bubbling up through storm drains to flood houses in a very similar way to 2011.
“I was watching the water bubble up through the stormwater system, it was very clear that it was stormwater, not river water, that was causing the problem.” detailing its backflow prevention devices includes a diagram of just such a scenario, where there would still be flooding in areas with blackflow devices because of the stormwater rather than the river water.The council’s environment and planning chair Tracy Davis says they were proud of how the backflow devices had performed while acknowledging the flooding came from a number of different sources in 2011.
He says for areas such as Brisbane’s CBD, individual buildings should look at installing flood barriers and pump systems with independent power supplies to stop their basement levels flooding.
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'Devices designed to stop the Brisbane River flowing up through storm water drains were installed after the 2011 floods and did just that in 2022, but houses flooded anyway' Man can not fight nature Climate change
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