Another reason why Australian governments might be reluctant to do the right thing and build more flood mitigation dams, is due to the mantra often repeated by AGW alrmists, that the Australian climate will become drier as a result of rising CO2 levels, so maybe the politicians think that flooding events will become less of a problem because current CO2 levels are claimed to persist for another 1,000 years or so, even if we succeed in reducing our emissions.
I experienced myself a major flood in Brisbane in early 2011. The previous major flood on a similar scale occurred in 1974. It was of course, at the time, described as the worst flood ever recorded, but BOM records show it was the 7th worst on record. Refer article below, showing graphs of previous flood heights.
http://www.bom.gov.au/qld/flood/fld_history/brisbane_history.shtmlThe extent of the damage from the 2011 flood was so great, the Queensland state government initiated an enquiry as to what went wrong, because we had already built a flood mitigation dam after 1974 to prevent another major flood occurring.
Of course, the enquiry never really got to the nub of the issue, and instead concentrated on lots of side issues such as the wording of the manual for those in charge of controlling the water levels in the flood mitigation dam.
However, from my unbiased perspective, it seems clear that the effects of the long drought that preceded the 2011 floods, caused a reluctance to use the dam as a flood mitigation dam, and instead offered the opportunity to fill the dam after many years of being nearly empty.
Such an attitude would likely have been influenced by prominent Australian AGW alarmists such as Tim Flannery who's on record as claiming that Australia can expect a drier climate as a result of CO2 emissions, and he said this whilst the drought was in process. It's perhaps understandable that the dam operators grabbed the opportunity to fill the dam, with all the best intentions no doubt, despite the fact that doing so eliminated the dam's purpose as a flood mitigation dam. They probably thought that floods were on the wane in Australia because of rising CO2 levels. (This is just my opinion. I don't intend to defame anyone.)
This is another example of the way that exaggerations about AGW can have a negative effect on our security and well-being.