It would take a billion cubic miles of water in 40 days to cover the earth to 29,000 feet. This is 3 times the total amount of water on earth. Where did this water come from? The latent heat of condensation would have literally boiled the oceans. Where did this billion cubic miles of water go? The latent heat of evaporation would have frozen the earth solid. The science of minimum population viability show how many breeding individuals a population needs to survive. In no species is this number 2 (unclean) 8 (human) or 14 (clean). In most species that number is several hundred to several thousand. Otherwise there is a severe lack of genetic diversity that results in species going extinct in a handful of generations.