You must bear always inmind, the Bible, itself, admits it is not the only account of what we know as history.
Mankind had drifted away from hi relationship with Go favoring idols and other things formed by their own hands in place of th eliving God. Because of this there are many renditions of a deluge, however the text of the Word was given toman to set man back on course with the true and lving El..God.
So YES, there are many stories of a deluge but afte man was good and confused He chose Abraham, Isaac, Jacob called Israel, and finally yet before the Messiah, Moses to set a few thns straight.
Previous to MOses writing down the history since Adam, oral tradition had been the way, but even that was beginning to drift...ergo, the Written Word from our Father began.