Noah's Ark: I don't know enough details to consider myself any kind of expert but, looking at the whole story, it fits together. You're right, the rain was not the only source of water. Here are a few things to consider:
Traditional understanding is that much of the water came from huge underground caverns, which collapsed, causing their contents to spew out. IOW, the pre-deluvian ocean surface was much smaller. Such caverns still exist under Florida.
B: The caverns in Florida are a result of groundwater effects on limestone. Neither the volume of caverns or groundwater in Florida amount to anything remotely needed for a Noachian deluge. It is a myth. Sorry.
Another source of water is "the floodgates of heaven." A few years ago, it was discovered that the earth is constantly colliding with huge masses of ice crystals lying along its orbital path.
B:? Reference? The Earth peridoically is probably struck by comets. However, the amount of water need to produce the Noachian deluge would require many comets, which also contain copious amounts of poison gases. You don't know what you are talking about, or you didn't understand what you heard or read. "Big Ice crystals" in its path. Really.
The apparent source of these crystals is - earth. We leave them behind as vapour and pick them back up, later. I suspect this process was somehow involved, as well.
B: You're babbling, sorry. There is no scientific justification for anything you've written.
The account indicates the flood as the first rain ever. That's quite a claim. If true, there must have been some massive atmospheric changes, as well.
B: And miraculously Noah and his family were supplied pressure suits.
Finally, another odd phrase is "the water covered all the mountains to a depth of 15 cubits." Well, all the mountains are not the same heighth.
B: Sez who? It doesn't say that in the Bible. Again we have a literalist interpreting the Bible to suit his own needs. So much for "Biblical Literalism".
I believe a tidal wave is being described here - one large enough to travel around the whole earth. The Scandinavian and pacific island accounts indicate something of this nature, as well.
B: Beliefs don't constitue evidence or facts. And tsunamis don't leave deposits which resemble the totality of the geologic column. Your fantasies have nothing to do with modern science.
P. S. There is no way of knowing where Noah lived, prior to the flood. We only know he landed somewhere between Turkey and Egypt.
B: We don't know anything, as there was never a Noachian Deluge. Most likely there was a local catastrophic flood in Asia minor some thousands of years ago. THe story of Noah is simply the Epic of Gilgamesh turned into a morality play.
If you wish to say Noah's flood was a miracle, just say so, and the argument is over. If you wish to argue that the evidence seen by scientists was planted by Satan, just say so and the argument is over. It is really futile to try to reconcile geology with miracles. People have been trying for 500 years and the results continue to diverge.