Water Resources: Hydraulics and Hydrology
the channel, and the old channel can be closed off. We closed off the old
so that
the old channel would fill in. Vicksburg has generally closed the
at the upper end
so that the old
became a backwater area for fish and wildlife.
So most of the cutoffs on the Arkansas became filled in like they were on the Missouri
River?
Right.
A:
In some cases the cutoffs on the Arkansas became separate lakes.
Yes. I was looking for a picture in River Engineering that would show how the cutoffs filled
A:
in. There were quite a few cutoffs on the Arkansas. We used a lot of the same designs for
the structures (dikes and revetments, closure structures) that were used on the Missouri, or
about the same.
When you're studying something like this and you've gained the experience, is it sort of a
tendency for you to adopt the same solution, maybe modify it just a little bit, or would you
go and look at a completely different solution to the problem?
Not only are the rivers different, but every reach of a river is different. It depends on the
A:
alignment. It depends on the flow. It depends on what the banks are made of. This picture
shows what they're doing in Tucson with the Rillito River you went across this noon. Soil
.
Soil cement for the bank?
They construct it with a grader so that it ends up being about fifteen feet thick along the
A:
bank.
Compacted?
Semi-compacted, I think. The Lower Mississippi is the only place that I know of where the
Corps has done a lot of flexible concrete revetment. It's just too expensive to use that type
anywhere else. You can do something that will work as well on smaller rivers, but is
cheaper.
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