Boyle's law perfection of math in the calculations or not; it still does not explain to me how there was a smooth concentric sphere of dirt and rock; on top of that enough water in vapor or ice form to deluge the planet, and in between an atmospheric layer which was of breathable temperature and pressure holding up all that water.
The theory that the water canopy was somehow in orbit does not make it for me either - in that case it would have to be ice pellets in circular orbit like the rings of saturn.
Now, when that came down it would have been the hailstorm to end all hailstorms, for sure.
Of course, all this is like debating 607BCE - when it just cannot hold up to any more analysis, you just say "thats the way it was cause thats the way I think the bible says it was - don't you believe in the BIBLE???