Still they won't believe it.
Evidence doesn't matter to them.
The reason why nobody believes your theory is that the timelines for differnt floods simply will not match up, period.
They're many thousands of years apart, in some cases hundreds of thousands of years.
For example, the hypothesis in this article is that the channel between England and France was cut 200 million to 400 million years ago.
Unfortunately for you, the Grand Canyon is only 5 to 6 million years old.
I mean, if the Old Testament said that God sent a volcano to chastise mankind, would you be massaging volcano sites all over the world, trying to make their timelines line up?