Swimming in crocodile infested waters isn't all that dangerous actually, provided you have a dog...
Toss the dog in first. If it survives the first minute, there's no crocs about (salties apparently prefer dog over human).
For the first 21 years of my life I lived in a town where it flooded annually. Fortunately the flood levees kept the worst of it out, but local rain still caused some issues within the levees. I went back in March 2010 for a few days and was completely flabbergasted to see buildings constructed in a MAJOR floodway. I've seen logs a metre or more in diameter sweeping through and just can't understand the logic behind spending a million dollars plus (per building) to develop such a risky location.
Although the floods up north are covering a large area, locations which haven't even seen rain in years, hundreds of kilometers away are being effected. With road and rail links cut, even washed away, supplies haven't been able to get through.
One of the big problems, which has barely been touched upon in the media over here, is disease and parasites. With all the stagnant water laying about, and the heat of an Australian summer, it's likely to be a bacterial and mosquito heaven in short order...