There were two floods. One was preAdam. Two was the flood of Noahs day and the dino's lived both times and were brought onto the ark in Noahs day
I have a hard time believing all of the animals of today plus their food and water and Noah's party fit on the Ark. Add all of the dinosaurs (sauropods especially large) and then we're going off the deep end.
If a person walked up to you off the street and tried to explain that under a different guise, would you buy it?