Iris is right though, Tsunami. In the fifty years I have been watching speedway the only changes I can recall to track surfaces are that they have become generally slicker and that they no longer seem to use sawdust on wet tracks. There may, of course, be a perfectly good reason for the latter - I don't know.
I apologise if I have posted this before, but somewhere out there must lie a solution to the wet track problem. After all, it can't be beyond a species which managed to send men to the moon and back to come up with some more weatherproof surface than we have now. My best suggestion is that the BSPA, or FIM or whatever, offer a research project to a number of technical universities aimed at finding a better surface material. It wouldn't cost that much, and we'd have some of the country's finest brains working on it.
Alternatively, we could all be defeatists and just sit back and hope for the best that next summer is a bit drier than this one has been, which I suspect is what will happen.