In the UK we have a system called Flood Re that helps homeowners in high-risk flood areas access affordable insurance by pooling the flood risk element of home insurance with participating insurers.
It was established in 2016 after negotiations between the government and the insurance industry. Properties built after January 1st, 2009 are generally not covered by Flood Re.
I have learnt all about this in the last few days as we are buying a house that may well be covered by it.
Perhaps Australians should lobby their insuranc eomanies and relevant politicians to establish a similar scheme.
I was looking at a photograph of floods close to where we are buying and noticed that on a new estate all the houses were effectively built on plinths with the front door and ground floor raised four or five foot above road level, so that although there was shallow flood water washing round the road and front gardens, the houses themselves were unaffected.
There are also a lot of quite simple measures you can take to make a house flood resilient, from putting non-return valves on plumbing, water resistant air bricks(the pressure of the water, closes the vent) to exterior doors and garden gates that can keep up to 2 foot of water at bay.
However in Australia, like in much of the USA, the houses are built of much lighter materials that make them more prone to be damaged by extreme weather.
I can remember seeing a house in California that survived the wild fires, when everything around it was burnt to the ground. It was built of brick and concrete and had fire resistant shutters and had been designed to resist the fire - and it worked.