Water Resources: Hydraulics and Hydrology
Yes, because there was so much sediment that if it had deposited, it would have been
A:
impossible to keep the navigation channel clean. Now, there are a couple of the
on the
Arkansas that are higher. Dardanelles is higher, and Ozark is higher. They've had some
problems with deposition in those reservoirs. At the head of the Dardanelle Reservoir, it has
silted in to such a point that the Corps has put in additional spur dikes to maintain navigable
through the upper end of the reservoir. It's up at the head of the pool, just below the
next upstream dam, that the depth problem occurs. Once tows get down farther into the
reservoir, sediment deposition doesn't affect navigation.
As you move farther into the pool?
Yes. However, if the reservoir is used for storage, flood control storage, storage for water
supply, etc., you really want to have all of that storage volume available forever.
So that's where sediment presents another problem, too, because it begins to limit the amount
of water that you're going to store?
A:
If it's a multi-purpose reservoir, then there may be so many thousand acre-feet of space
allocated to flood control, so many allocated to power, so many for recreation, and so forth.
When deposition occurs at the head of a reservoir, which storage are you losing? When
deposition becomes sufficiently extensive, it becomes necessary to reallocate the storage
space. That's a very controversial thing.
When you get to something like that, who makes those decision?
I don't know that any have been made yet.
A:
Q ..
Who would make those decisions? Would that be the reservoir management people?
A:
This would be between agencies, between various interests.
Multiple agency or inter-agency decisions?
Yes.
A:
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