Subduction Zone
Regular Member
The people would have no idea that a flood was coming. Those on the lowest ground had no way to communicate a coming flood to anyone else. It was raining, possibly hard; they would have been dealing with that by staying sheltered. Visibility would have been poor. When the flood water arrived they would have had no time to prepare for a trek to high ground. If some did make to 'safety' it would only be temporary as they would have died from starvation and exposure.
That is an assumption that you cannot justify. First you need to tell us the limit of the flood. And remember, there is still no physical evidence of this flood. Even with your limited flood there is evidence of older smaller floods that should have been overwritten if your version ever occurred. And you still have not explained where the water came from, where it went too. And why we do not see universal population bottlenecks.
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