In this video of the Hurricane Helen flooding, because the water is moving, you can easily see that the brown on the tracks in the background is water that is going around the dam.
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| Facebook Reel |
This is the third example I've seen in 2014 teaching us that engineers need to pay attention to the height of the abutments of concrete dams. The first two examples I have seen are:
Rapidan Dam. This is an early photo. After a few days the bank was eroded underneath that house and all the way down to the downstream level. The house disappeared.
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| StarTribune, Aaron Lavinsky/Star Tribune via Dennis DeBruler |
Nolichucky Dam. The TVA had to do repair work of the right abutment.
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| 0:19 video via Dennis DeBruler |
There are whitewater sports on this river. As an example of the impact of rain on this river basin, just an inch of overnight rain increased the flow from 2,800cfs to 5,500cfs. [BlueRidgeNow]
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| Facebook Reel |
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| Facebook Reel |
This is what a more normal flow looks like.
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| Duke Energy posted Marshall Hydroelectric Station is the perfect backdrop for fall. Nestled on the French Broad River in North Carolina, the station began operations in 1910. Quick start-up times make hydroelectric power ideal for providing electricity in a matter of seconds when demand is high. |
The island that we see in this photo appears to be under water in the third Facebook Reel screenshot above.
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| Ryan Phillips Photo |
A good view of the hydraulic jump because of Hurrican Helene.
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| r/asheville, Hurricane Helene |
I found a capacity figure of 5mw, but that seems too low. [GlobalEnergyObservatory, the GPS coordinates don't make sense.]
These are the flood waters that destroyed the Southern Depot in Marshall, NC.
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