Geomorphically Incorrect Art #3

A couple of nice "what the future will look like" paintings from this cool little blog.  No artist mentioned, but it is signed.

Clearly this one is geomorphically incorrect; it's a built channel.  But there are some serious problems with hydraulics and, unless the channel is depicted during a flood event, capacity to pass large flows.

I love the plantings on top of the spillway.  Has the Army Corps ever done that?

What design problems do you see?
For a real life giant concrete channel, check out the South Fork of the Zumbro in Rochester, Minnesota.  Sedimentation problems, anybody?

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