I find it pretty curious as to why would attempt to dispute this since Bible Critics usually take a different tack.
What doe this have to do with anything? I’m not a Bible Critic.
In any event, yes, I grant you that they are common… but that could also be accounted for in the fact that flooding is a phenomenon that most people would have been familiar with (as it happens in most parts of the globe) and, as such, they would have had myths to go with such events, just as they did for the sun, the moon and other natural phenomena.
The Wolf