After Noah beached, where did all the water go?

One thing that I find amusing is that most people do not see the fact that, as water seeks its own level, in order to have a flood that would cover all the world's mountains, the entire world, including all the oceans would have to be covered with about 10,000 meters of water, or 10 kilometers of water. Now, I just checked and the surface area of the planet is 510 million square kilometers. To cover all the mountains with water would require 5 billion, 100 million cubic kilometers of water. So, after the flood, where did it go? It won't fit back in the ocean basins.