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Notes -
Imagine that a bunch of rain falls into the mountains surrounding a valley. It ALL has to flow down to the valley, then flow through the valley as water tries to reach the lowest point.
Enough water collected in the mountains, flowing down a valley, all at once, can be a concentrated force that crushes most things it encounters. Like a GIANT waterslide, the water collects and gains velocity on the way down.
Florida has no mountains. We're flat. All the rain falls on the state and mostly just sits there. We have a lot of rivers, canals, etc, and the big lake in the middle of the state, so there CAN be flooding, but not a huge rush of crushing water.
Thanks to Helene, one of my friends who lives on a river in Florida (just bought this year, sadly enough) had three feet of water in his house. He was there when it started coming in, and when it hit the one foot mark he was able to load up his car and drive out.
Also Florida sits on a bed of limestone, which is porous, so a decent portion of the water will get absorbed down into the Aquifers.
Downside is there's nothing to stop the wind, so a heavy windstorm will flatten whole areas. But if there's a will to do so, building back up isn't too hard.
Ah right, makes complete sense. I was thinking only of flooding caused by the ocean surging and not rain on land.
Mountains also have another possible source of flash fooding: spring melt.
This was a big part of what tore through Yellowstone a couple years ago; up to 5 inches of rain brought down up to another 5 inches of meltwater, before all that got channeled into the Gardner River. This can't be much of an issue for Tennessee, though. 5 or 10 inches of snow a year there, that would turn into less than an inch of meltwater even in the worst case.
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