The breaking of the Black Sea dam doesn't quite seem to fit, time-wise.
My thought is that the flood stories come from the thaw after the last ice age, when sea levels relentlessly rose, wiping out regions like Doggerland and Sundaland. Even today, most of the population lives near a coastline. It's likely most of humanity was displaced.
If the literalist-estimated date is used, there is no fit with either one.
Plato’s flood OTOH, which destroyed Atlantis, fits the date of the catastrophic flooding from the melting glaciers — and attributes the destruction of Atlantis to a change in the motion of the celestial bodies.