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The so-called ‘100-year’ (or 1% Annual Exceedence Probability) flood has two main uses in the public domain in Australia. Both are problematic, though not intentionally so on the part of those whose professional activities are bound by its use. .
New South Wales Premier Dominic Perrottet has made a decision which has been on the cards for decades: his government will ‘fast-track’ the raising of Warragamba Dam as a means of mitigating flooding on the Hawkesbury-Nepean river system.