The Bible talks about one great flood, called the flood of Noah. There are passages of local flooding but what passages are you referring to?
The first Biblical record of a worldwide flood is in Genesis 1:2. The actual events that brought about the flood are between verse one and two and are unrecorded. There’s a gap between verse one and two.
There are references throughout the Bible to what went on in that period and I believe this is the period when Satan fell and dinosaurs roamed the earth. But there’s no chronological record in the Bible of what happened between verse one and two.
We don’t know how long that period was, but science records it 4.5 billion years from the creation of the earth in verse one. Many Christians have long been confused about this which is why there’s some confusion among some Christians who challenge science as to the age of the earth.
The only definitive Biblical record of this period is the effects recorded in verse two. What follows verse two is actually God’s RE-creation.
The second Biblical record of a worldwide flood was of course Noah’s flood in Genesis 7 & 8 after which God promised he would never again flood the earth.