I don't think many policies in Oz actually cover floods where the water comes in through the doors etc. Was advised by one bloke in the SES once that If I saw water heading for the door, to make sure there's a sheet of roof off, and enough water through the roof to sag the roof...would be technically fraud (?) I think, but the Insurance industry aren't much better.
Our former Contracts manager (good guy) was going head to head with a company who wanted to be indemnified by "Acts of God" in their contract...the battle was great to watch.
First offer, tongue in cheek was to tell them to get God's details, and we'd pay them to hold insurance expressly for acts that could be proven to be God's work (onus on them to prove it), however, once God was proven to have acted, we owned the rights (and the money) for proving he was there.
They told him he was being silly, so he again offered them that if they identified all of the acts that God was likely to do, we'd look at excluding each of those acts from the contract..
They told him that he was being silly again, so he asked them to list ALL of the items that could be covered, then started adding to the list himself...
They dropped it.