First of all, the rains fell for forty days and forty nights. The actual Flood lasted for a solar year. It might pay to actually read the text you are debunking.
Secondly, what papyrus? What are you talking about? Are you talking about the Torah Scroll from which the story of Creation and the Flood come? That wasn't papyrus but animal skin (all Torah Scrolls have to be written on animal skin), and it was written by Moses at Mt. Sinai, where G-d dictated it to him letter-for-letter. Perhaps you would like to make a remark about that?
G-d dictated the portion about Noach because of the Noachide covenant with all humanity. He dictated the account of Creation only to refute the Nations of the World when they accused Israel of stealing the Land from the Canaanites. Bet you didn't know that either.
See also Post #48, above, concerning the flood.
That doesn't weaken my point. If anything, it strengthens it. Do you expect papyrus to survive a year-long submersion.
Secondly, what papyrus? What are you talking about?
We have examples of writings on papyrus used by the Egyptians going back to close to 4000 BCE.
The Egyptians were prolific record-keeper. We have more or less an unbroken series of writings from around 4000 BCE until today. It is interesting that the Egyptians never mentioned the occurence of a global flood.
Are you talking about the Torah Scroll from which the story of Creation and the Flood come?
Does that Torah Scroll still exist and how old is it?