I'm still researching but, just a note: If the oceans are lowered and the mountains raised during the flood, you don't need as much water as you indicated.
No, that's true, you'll just destroy the surface of the earth instead with the energy requirement for moving it around so rapidly.
And you cannot escape the requirement for absolutely *vast* quantities of water if you accept that mountains existed prior to the flood (as Genesis says they did)
"I'm still researching but, just a note: If the oceans are lowered and the mountains raised during the flood, you don't need as much water as you indicated."
I am still researching, but didn't you get this backwards?