Flood, page-22

It is a symbolic story that Jesus referred to as being the same as His experience. You will note that there were no global floods in Jesus day.
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Jesus used the events in the life of Noah as a warning for our day.
(Matthew 24:37-39) For just as the days of Noah were, so the presence of the Son of man will be.  For as they were in those days before the Flood, eating and drinking, men marrying and women being given in marriage, until the day that Noah entered into the ark,  and they took no note until the Flood came and swept them all away, so the presence of the Son of man will be.

When Jesus referred to the days of Noah, he did not speak of the violence, the false religion, or the immorality—grievous as those were. The error that Jesus highlighted was the refusal of people to heed the warning being given. He said that they were “eating and drinking, men marrying and women being given in marriage, until the day that Noah entered into the ark.” Eating, drinking, marrying, being given in marriage—what was wrong with that? They were just living “normal” lives! But a flood was coming, and Noah was preaching righteousness. His words and his conduct should have been a warning to them. Still, they “took no note until the flood came and swept them all away.”

Peter, one of those Jesus was speaking to, got the point.
(2 Peter 2:5) And he did not refrain from punishing an ancient world, but kept Noah, a preacher of righteousness, safe with seven others when he brought a flood upon a world of ungodly people.