Seems much more likely it's something really unusual. Like say the Mediterranean basin and the resulting Zanclean flood. Back before humans were in North America it was a giant fertile basin with numerous rivers. Then one river that happened to come from the Atlantic ocean started to make some progress with erosion and kept getting bigger. The feedback loop turned into something that embarrasses Niagara fall by many orders of magnitude.
If you lived in the Mediterranean basin this would have made quite an impression. I believe this event was well depicted in https://xkcd.com/1190/ or https://blog.xkcd.com/2013/07/29/1190-time/
As big as that mega flood was, there have been others and certainly seems like very good source material for the numerous flood myths.