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Hacker News Comments on
The Most Dangerous Dams

Practical Engineering · Youtube · 75 HN points · 0 HN comments
HN Theater has aggregated all Hacker News stories and comments that mention Practical Engineering's video "The Most Dangerous Dams".
Youtube Summary
Dams serve a wide variety of purposes from hydropower to flood control to storage of water for municipal and industrials uses. But when a dam’s useful purpose fades away, the structure itself still remains. Dams come in all shapes and sizes, but contrary to what you might think, the most dangerous dams are often the smallest, also known as low head dams.

-Patreon: http://patreon.com/PracticalEngineering
-Website: http://practical.engineering

Writing/Editing/Production: Grady Hillhouse

Tonic and Energy by Elexive is licensed under a Creative Commons Attribution License
Source: https://www.youtube.com/watch?v=U6fBPdu8w9U

This video is sponsored by Squarespace.
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Hacker News Stories and Comments

All the comments and stories posted to Hacker News that reference this video.
May 24, 2020 · 74 points, 11 comments · submitted by basicplus2
lmilcin
It should be mentioned that if you find yourself in this situation and there are no other options, the best way out is to actually dive immediately close to the dam with the submerging water while you still have strength and air. You are aiming to be carried by the water at the bottom that is not circulating.

Trying to float serves no purpose and may actually bring more people in danger who will feel they need to help you.

If you try to float you will be constantly rejoining the part of the system that is recirculating. The only way to leave the system is with the water at the bottom.

There is no guarantee of safety, though. You can get banged up pretty badly at the bottom, hitting rocks, etc. Loose consciousness and drown. The best way is to recognize the danger and never let yourself find in this situation.

beervirus
Great YouTube channel. Watching his videos, I’ve learned a lot about a subject I really never thought about before.
apple4ever
I just discovered them too. His videos are really great. Well organized and well spoken. Really easy to digest and understand.

My favorite is the Culvert video, and really any of the water ones.

amelius
Ok, so what is your best course of action when you find yourself in a hydraulic jump?
andybak
Did he use the word "recreator" as in "one who participates in recreational activities"?

Is that commonly used in the US? It sounded very peculiar to me - almost like one of the famous George W. Bush neologisms.

dragonwriter
> Is that commonly used in the US?

It's commonly-enough used that it appears in most dictionaries of American English I can find easily, but rarely enough used that I've barely ever seen it in use and never heard it in conversation.

dehrmann
Commonly? Not sure, but it's a loanword from Latin, so it's not a neologism, or anything.
andrewflnr
Growing up in the US, I never heard it used that way. It could conceivably be engineer jargon.
Alex3917
Another good dam video worth watching, about undamming the Hudson:

https://www.youtube.com/watch?v=Sg2wxsYtzOs

I think because of the Michigan dam collapse I've been caught in a YouTube loop of getting recommended (and watching) dam removal videos for the last 24 hours.

andybak
Vaguely related - I found this on Reddit's /r/todayilearned a few days ago and the video is astonishing:

https://en.wikipedia.org/wiki/Pantai_Remis_landslide

https://www.youtube.com/watch?v=H6Ma0SVjMHA

hanniabu
Really wish they zoomed out so you can get a sense of the scale...
Mar 27, 2019 · 1 points, 0 comments · submitted by jatsign
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