As far as we know today, great flood is not a historical event. There are many people wondering about where is the Noah's ark... So if you make some speculations about it, you'll get the money from many foundations for your research.
Some people like that conduct marine research in Black Sea. They also say that they've found the evidence of flood. But within the archaeological or geological point of view, it is not possible to find evidences for it.
As many people recognized, there are many similarities between the Bible and Sumerian mythology. Similarities among the other religions' holly books are evident too. So we may say that christians, jewish and muslims can find the roots of their religions in the Sumerian mythology. They are all the same. Not only flood story, there are many other similarities too.