What is a Weir?

I'm one who loves viewing dams and structures built to control waterways for our benefit. If I see a sign along the road that says "dam", I immediately turn off and investigate. This information will help me further bore my friends. Thank you for that.

Found this really interesting. The weir in Galway, my hometown, creates a pretty unique cityscape. I have always been fascinated by it, but never really put much thought into it why it existed.

So it’s grammatically correct to say that all rivers get “weird” after a weir is built.

Your videos should be shown in all schools to inspire young minds. I am a 69 year old retiree and I'm a perfect example of a why videos like yours are important! When I was in school I hated math and I was a mediocre student overall. I always say if that math could have been presented in a way that was interesting to me then I would have excelled in my studies. I did ok during my career, although when I look back at my life I would have enjoyed being a mechanical engineer because I have a natural inclination for it. If I had only known what was possible when I was a teenager in high school I would have taken a very different path!

Me the next time I see a weir: "It's actually called a weir."

If a pier is an artificial outcropping over water for people, then it makes sense that a weir is an artificial outcropping over water for water!

Weirs have also been used, historically, for fishing. Some of the oldest weirs were built in a triangular fashion almost exactly as shown towards the end of this video, made of rocks placed across shallow rivers. This allowed water to flow over while trapping fish, behind, which could then easily be caught. There are some pretty obvious downsides to this approach - namely that it almost completely stops the ability of fish to move along the river's course - but old, historical examples can still be found, at least in pieces, in small rivers and streams.

My small town just replaced a dam and now I know why the new spillway is such a strange shape.. It's a labyrinth weir! Thank you 🙂

3:10 "So how we can flatten this curve?" Flattening curves before it was cool.

I had no interest in weirs but clicked on this all the same. Turns out I found your description and examples very interesting. Bravo sir.

Weirs, especially old weirs, are a danger to Rafters and kayakers. We try hard to know where they are

You should definitely do a video on the dangers of these structures. I learned early in life (age 14) of the danger of these structures when a neighborhood kid died falling off of one while trying to walk across.

youtube randomly recommends this video and I find it interesting.

Youtube: Ever wondered about Weirs Me: Nope "click" And yet i watched it all, great vid.

‘When a tree falls in the river, does it make a weir?” lol

There are too many comments to search through to see if it's mentioned, but water treatment plants also have weirs for sedimentation basins. As fair as I've seen, they are fixed and set to keep the water basin at the same height all year.

Just proves that even the simplest looking objects, turn out to be complex after investigating.

Everything is interesting, if you go into it deeply enough. ~ Feynman

I was revising for my fluid mechanics paper and came through this and I genuine appreciate engineering

4:19 Props to the Valve - Half Life 2 developers. I didn't realize that after I beat the hunter helicopter in Water Hazard and opened the gates I jumped over a weir. Solid.