When you’re in the mountains there isn’t really any flat land. It’s like the roof of your house. The rain doesn’t stay on the roof, it runs down into the gutters. Even a little rain will cause a steam of water to pour out the drainpipe. In mountainous regions like Kentucky, most people don’t live on the side of the roof-like mountains, they live in the flat gutter-like valleys and lowlands since it’s easier to build there. So any significant rain will flood the low areas quickly.
Also, 10 inches is a lot of rain.
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