Actually, you have to go to 29,000 feet since EVERYTHING was submerged, which means Mt. Everest. I did it once, it ended up being about 30 TIMES the total water on the Earth and in the atmosphere right now. A few pot loads, I'd say!
Mt. Everest may not have been there at the time of the flood you know.
Thats assuming that the Mountains were at the same height during the flood. I tend to believe that the continents broke apart during the flood and the mountains raised up in the aftermath of the flood which would probably have included massive volcanic and tectonic activity.
There was NO Mt. Everest before the flood! The Earth's topography, as we see it today, is the result of the gigantic forces unleashed at the time of the flood. All the mountains, volcanoes, tectonic plate activity, even rain are the results of the flood. Yes, I said rain. Read your Bible, there was no rain before the flood. The Earth was watered by a mist coming up out of the ground (Genesis 2:5&6).
For those interested in the where all the water came from and where it went, see Creationscience.com Here you will find most of the answers to questions about what happened at Noah's flood & why there are flash frozen Mammoths with grass still in their mouths found in Siberia. Notice, I didn't say woolly mammoth because they weren't woolly. Siberia had a temperate climate before the flood.