there are over 250 flood stories so whats your point? I think that means that there was a flood.
There are also over 250 Sherlock Holmes stories. Does that mean that Sherlock was real, too?
For that matter, there are over 250 Star Trek stories, too.
Of course, the statement "there was a flood" is also pretty conclusively true. Much of my town was flooded a few winters ago -- I've even lived through a flood. By the time I finish telling my grandchildren about it, it will probably end up covering the entire world. The question isn't whether or not there was a flood, but whether or not there was a global flood as described in the Bible. I see no reason that that particular story should be given any more credence than The City on the Edge of Forever or The Dancing Men.