Now, what happens when across the river from Portsmouth there is another town? When P raises it's wall, then the water goes higher.
So the other town needs to raise it's walls. And then the river goes higher, so then P has to raise their walls again.
That is what is happening by Fargo/Moorehead in the Red River. It becomes a battle of who can build higher so we can let the excess water dump on the other....
Then, the surrounding farms end up with all the back-logged water that can't fit through the narrow deep channel the 2 cities create. So the water piles up deeper & deeper, flooding out farms and small villages.
What a nice deal those cities with their levees are, eh? Phht on their dikes....
In general the lower Mississippi has worked pretty good with rtheir system of levels and back-up levees. This was a truely extreme event, been 40-80 years since we saw anything like this. And the systems, tho stretched greatly, are mostly working as planned. It was planned out as a bigger system, with backup and whole regional planning. Not like the cities do now, build thier own dike & to heck with anyone else.
Would be nice to make improvements tho, I'm sure things could be better.
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