Actually, if it were normal rain, all the salt-water fishes would die as salination of the seas decreased. Thank goodness it’s just a story, and thank God I’m an atheist.
There are wide-spread flood stories, and I’ve thought for a long time it’s because so many early civilisations started next to big rivers—Indus Valley; Mesopotamia, Egypt. I imagine the family sitting on the roof during the latest inundation whilst Grandpa is scornfully lecturing them: “Pah! In my day we had floods that would make this look like a drought!”
Unless it was in Egypt when he would start “Ptah!…..”