To begin with there was a whole lot of water on the planet's surface post flood than pre-flood, most of it being in the atmosphere and sub-terrain.
How much in the atmosphere, Buz? You mention "the weight of the falling water." If there were only 100 inches of precipitable water in young Noah's sky, instead of the inch we have now, how warm would the atmosphere
have necessarily been to keep it there as vapor? As you have recently shown that you have no inkling what "superheated steam" even means, I will wager that you can't even guess.
100 inches isn't even six cubits, Buz. Not much weight......
"The Christian church, in its attitude toward science, shows the mind of a more or less enlightened man of the Thirteenth Century. It no longer believes that the earth is flat, but it is still convinced that prayer can cure after medicine fails." H L Mencken