I tried to read through the material at that link in the OP, but when I got to the reference to "rhinoceros lizards" I gave up. It's just a list of sites where mass deaths have occurred at various times in the past, with no indication of the dates of these events, no links to legitimate archeological references, nothing to give it any real credibility.
It's true that The Flood is a biblical event, in that it's recorded in the Bible, but the question is whether it's a real event, and the answer to that is certainly no, there was never a global flood. There isn't enough water on the planet to flood the whole place, given its present topography. Every culture has flood tales, but those are readily explicable as local events. A large scale flood would certainly look like the whole world is flooded to a culture without mass communication and transportation systems.
The Black Sea scenario Pastafarian referred to is interesting, and there are a couple of others similar to it. One is the Strait of Gibraltar, which at one time may have been a spectacular waterfall as the Atlantic poured in to the Mediterranean basin. Another is the Bab al Mandab waterway between the Gulf of Aden and the Red Sea, which also may have been a spectacular waterfall in the relatively recent past. Both would have produced fairly rapid flooding of what were areas of human settlement, if they're recent enough. I don't have the dates on those, unfortunately. I'll poke around and see what I can find. If my memory is correct, Orson Scott Card wrote a pretty good SF story based on the Bab al Mandab scenario, and he does his research pretty well. Wish my memory was good enough to remember the name...
Those events are tectonically related to the movements of Africa with respect to the Eurasian land mass. The Red Sea is part of the rifting system that extends down into east Africa all the way to Mozambique and up into Turkey. I think at one time both the Strait of Gibraltar and the Bab al Mandab were closed to the sea; now they're not, so there must have been a time when they opened as Africa torqued around. Or maybe it was the rise in sea level at the end of the last ice age. Or both. It's fun to speculate, but I think I'll go look for more data.