If you flatten, or smooth, out the earth so it has almost no elevation and then add a little water to the system, you could flood the whole plantet.
That's the model you've refused to address.
But no one is required to address such a "model" because it isn't a scientific model at all. To be a scientific model there has to be some viable scientific hypothesis to explain the mechanisms involved. So for example, how did we get from the smooth earth you are suggesting here to what we see today(and in 4000 years if you are a YEC)? Anyway the Bible clearly talks about mountains in the text, so this so called "smooth earth model" is contradicted in the biblical text itself.
Edited by deerbreh, : add missing quote