Somebody once claimed the Ark is at the 13,000 foot level on Mt. Ararat. I did the math on that (volume of a sphere of Earth's radius+2.46 miles minus the volume of a sphere of Earth's radius). It requires about a doubling of the Earth's water just to get to there. If you're going to completely cover all the mountains, it's vastly more.
13,000 feet would be sufficient for any deity contemplating global genocide.
What did you use as a starting figure for the earth's water? Did you take into account the water found several miles below the earth's surface? Do you know where all the earth's water is? Do you know with much exactitude what were the physical characteristics of the earth's surface several thousand years ago? Did you start your calculations while holding the belief that all accounts of a world-wide deluge are false?