Yes, there is a lot of evidence for a large scale flood that occurred at the end of the Ice Age. Research the Younger Dryas period; the prevailing theory is that a comet collided with the ice caps and caused large scale melting and flooding.
There are accounts of a great flood, a dark cloud blocking the sun for many years, and a sudden return to cold, wintery conditions in the "myths" of every ancient culture in the world. This is all consistent with the after effects of an impact by a comet. There are also many accounts of humans being warned of the impending disaster by an advanced culture, and being told to build some kind of shelter, either underground or in the form of a boat.
As for geological evidence on Earth, there is plenty to suggest a catastrophic flood, such as the Channeled Scablands in the US.
I think some people are so against religion that they dismiss everything written in the Bible and other religious and ancient texts as fantasy or myth, when actually there's a lot of truth about the history of mankind in there. Get rid of the religious overtones from the Noah story, and you have an account of a very real natural disaster, that modern science is only now starting to understand.