Levee_s, Dams, and Flood Channels just DIRECT water... often causing further issues DOWNSTREAM. Just take a look at New Orleans... half the city is reclaimed land, yet they (the city and State of Louisiana) refused to pay the billions it would cost to maintain and upgrade the levees, and now it costs the Federal Government even MORE to pay for their negligence.
YES, there are projects that CAN be built... in certain areas... Japan built a system near Tokyo (Atsugi) that includes underground _tanks_ that are a mile long, half mile wide, and 100 yards deep... to divert flood-waters. Of course, this was built at a cost of over $200 billion.
I WAS impressed during coverage of the Red River flooding... CNN was discussing _invisible walls_. Individual levees of concrete surrounding a structure, and the _gates_ have drop in panels. These systems are in use around the world, and have saved structures... though they are usually paid for by the property owner.
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