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Wivenhoe Dam is presently at about 120% of the supply capacity, which is 1.15 million megalitres. However, there is an additional 1.45 million megalitres of flood mitigation capacity. In other words, when the dam is "full" it's only about 45% design capacity.
Over the past few years, when people were whingeing that Wivenhoe had been built in the wrong place, they had conveniently forgotten the '74 floods, and this was a major reason for its construction.
If we have another 250mm of rainfall, they will have to open more gates, and then it will be awesome.
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