Water
Hydraulics and Hydrology
How about Garrison.
Garrison is quite similar to Fort Randall, and Oahe is similar, too.
They're all pretty much the same?
That's right. All three are earth structures with the same kind of spillway and outlet
The things that were learned [at Fort Randall] were used in the design of
It was decided that the spillway for Garrison or Oahe, I forget which,
Garrison and
had to have a stilling basin because spillway discharges entered the downstream erodible
river channel close to the downstream toe of the earth embankment.
So those were the kind of things that you mainly did on those big projects?
Yes.
River
and Dams
Were you involved at all in any of the dams on the Ohio, the navigation dams?
Yes.
What kinds of problems did they have compared to these big hydropower and flood control
dams on the Missouri River?
They all have spillways, and the dams are not very high, so the spillway problems were
not too difficult. A lot of them were concrete dams, and the spillway consisting of an ogee
section near the top of the dam extended nearly all the way across the river. A number
of tainter gates, generally about feet long, operated off the ogee crest. Generally, a
spillway stilling basin was provided at the downstream toe of the dam. Its design was not
very complicated because the drop in the river level at the dam was only 30 to 60 feet.
With respect to the design of navigation locks, there are no particularly difficult problems
if the difference in the water level in the downstream and upstream lock lift isn't more than
about 30 or so feet. As I recall, on the Columbia River lock lifts are 40 to feet. I think
there is one lock that has a lift of about feet.
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