I'd like to explain from my own POV, how I've come to accept the flood as having happened... please no flames, this is just my opinion.
We see evidence in places like the Grand Canyon, where some form of great rush of water may have carved the thing out, and in places like the painted desert, that has fossilized fish in the rock formations, and with creatures like the Wolly Mammoth who was found preserved in a chunk of ice in the former soviet Union, with undigested food still in it's stomach. Scientists believed it had to be frozen instantly for that to happen... So I believe something had to have happened.
According to the Bible, the earth and heavens opened up to flood the earth. To me, that explains how the continents seem to have once fit together. It also explains the records of such long life, prior to the flood. I believe the earth once had an atmosphere of water, which blocked the harmful rays from the sun... kind of like living in a fish tank. The sky would have been green, most likely. The Bible also talks of never having rained before... of crops being watered by water coming from the earth...
I know, I'm using a lot of references from the Bible, but if we're going to discuss the myth, I want to put it in context.
I believe that it would have been possible for God to put the animals into hibernation until this was over. If not, the animals wouldn't have tolerated each other, been able to be fed or watered and their feces would have asphixiated everyone. LOL!
Christian scientists have maintained the ark was on Mount Ararat for a very long time. It's only until recently that they have found evidence of something up there, by taking samples of the wood structure and carbon dating it.
I believe that for so many different cultures to have a "flood story" that something had to have happened... is it verbatum from the Bible? Probably not... but I prefer to keep an open mind about things like this. Some things can't be explained scientifically where matters of ancient mythology are concerned.
Some things just have to either be believed by faith, or not believe by skepticism, but I would never tell someone they were insane to believe either way... it's all a matter of personal belief.