Sydney is flooded, again, as climate crisis becomes new normal for Australia's most populous state

What was previously a once-in-a-generation event has become commonplace, raising questions as to the long term sustainability of flood-prone communities in Australia's New South Wales.

But for the fourth time in 18 months, café owner Darren Osmotherly is rushing to move his equipment to higher ground as floodwater rises across Greater Sydney after days of heavy rain.

"Every six hours to eight hours (we're) trying to have a hot shower and get changed again and try to have a coffee break room or a short sleep in between," said Osmotherly, who says he's barely slept for three days.