It was one of those “one-in-one-hundred-year’’ weather events we hear so much about that it has become a statistical cliche.

An outback town is reeling from its wettest day on record following an ex-tropical cyclone as a drenched state braces for more flooding and livestock losses.

The most dangerous flash floods can develop in minutes. And they’re becoming an increasing risk to one of Australia’s most relaxing ways to spend the summer, camping or parking a caravan by a river.