Around the 19-20 min. mark, secular geologist David Montgomery has an interesting discussion regarding the topography of river deltas and flood patterns.
In big river deltas you'll find that the high ground is right along the river and the levees of the river, and the land slopes off to the side, [which is] why, when it floods, the coarse sand settles out right by the river and builds the high ground.The far area though, when the river overtops its banks, as big rivers eventually do in a big enough rain somewhere upstream, basically the surrounding terrain fills up like a bathtub. Well, the delta of the Tigris and the Euphrates rivers were very similar…flooding the valley wall-to-wall at a depth that you couldn't stand in and survive [might] have been the origin of the story of Noah's flood.
That's a model of a catastrophic regional flood. Standing water needn't be terribly deep to make an area uninhabitable.
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