Is there evidence that there was a flood on earth as told by the book of Genesis?
The Earth has never been ‘totally flooded’. In the period conceivably addressed in the Bible – the past few thousand years – sea levels rose dramatically after the last ice age. From around 20,000 years ago until about 8,000 years ago sea levels rose by around 130 metres (400 feet!) in total, and many coastal communities would have been flooded. However, sea levels have been relatively stable for the last 8,000 years.
Could the Biblical tale record some folk-memory of historical flooding? I guess that is possible, but it is certainly not literally true.