There is plenty of evidence of massive floods all around the world. That is becoming less and less debatable. If you are secular minded you can say these floods provided the impetus behind the more or less universal great flood “myth” found in hundreds of cultures and traditions around the world. If you are of a Christian bent, all of this is further proof of Biblical truth.
Argue those points as you wish, but there is tons of evidence for a massive flood or floods in our past.
Of course there are legends of great floods all over the world. These cannot be Noah's flood. That doesn't even make sense.
Take for example the Native Americans. They have a legend of a great flood here in North America. But the legend doesn't say "The flood killed us all. Yes, we were all dead but then we were re-inhabited from the decedents of Noah."
That doesn't even make sense. If Noah's flood really killed off everyone except for Noah's family then the legend would be from the perspective of Middle East. It would be a legend of coming across the ocean. Native Americans do not have a legend of coming across to the Americas.
