According to the story of the text the land mass was still in one place and was divided after flood of Noah.
Well that can't be referring to Pangea, because humans didn't exist yet at that time. Humans didn't start existing until about 200,000 years ago, and the land masses were already physically divided by then. So maybe something else is being referred to as "divided", maybe its something like how America was divided into states. Thoughts?
That being the case there is no way of knowing the elevation of the land mass at the time of the flood of Noah.
Well, since Noah was a man, and humans only started to exist about 200,000 years ago, we could determine what the highest elevation was during that time and give ourselves an upper and lower limit. Would that work for you?