How does 10 inches of rainfall cause extreme flooding like what we are seeing in Kentucky?
In: 9091
10 inches on a hill, plus 10 inches in the valley turns into 20 inches in the valley very quickly.
But also, there may be a lot of hill above the valley, and 10 inches across many square miles of hill can result in a LOT more than merely 20 inches in the few square miles of a valley very quickly.
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