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3,406,059 Views • Apr 4, 2023 • Click to toggle off description
See Part 1 of this series here: • Why Rivers Move
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Practical Engineering is a YouTube channel about infrastructure and the human-made world around us. It is hosted, written, and produced by Grady Hillhouse. We have new videos posted regularly, so please subscribe for updates. If you enjoyed the video, hit that ‘like’ button, give us a comment, or watch another of our videos!
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Producer/Writer/Host: Grady Hillhouse
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Views : 3,406,059
Genre: Education
Date of upload: Apr 4, 2023 ^^
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RYD date created : 2024-05-05T04:29:26.193009Z
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YouTube Comments - 2,363 Comments
Top Comments of this video!! :3
So basically those 3 million subscribers give you access to the toys every kindergarten engineer dreamed off. I'm absolutely not jealous at all! Well done.
9K |
Where I grew up in Germany, it was customary to have a hand crank water pump in children's sandboxes on playgrounds. As kids, we would spend HOURS creating river channels, dams, bridges and stuff like that. It's incredible how play at a young age like this can hone your intuition on complicated engineering concepts like this.
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As someone from a country with comparatively little soil over bedrock and practically all foundations supported by solid rock down to several kilometers, I keep finding myself surprised how much trouble other people get from things not staying where you put them due to erosion.
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This is so fantastic! It's one thing to hear "sediment builds up" but it's entirely different to feel the anxiety as you watch the particles stack closer and closer to a 'dam'. What a terrific learning tool and what wonderful work.
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In the Netherlands, most major rivers have flood plains at least some three to four times the width of the river's regular channel, and there are significant restrictions on things like construction in those areas (e.g. no permanent buildings). Whenever I see pictures or videos of rivers in other countries, in particular outside Europe, the lack of such flooding areas always stands out to me more than anything else - there's several examples of such footage in this video, in fact.
If you're planning on making more videos on this topic, I can recommend looking into the Dutch "Ruimte voor de Rivier" (room for the river) program, which aimed to further improve the quality of rivers, often based on the long-term consequences discussed in this video. At the risk of being a little self-congratulatory (though we probably deserve it; we have a reputation when it comes to water management), the Netherlands are pretty good at executing projects like this.
1.5K |
Your model of a dam in a flume, filling with sediment reminded me of a story from a dive master about a dive at Imperial Dam: The dive was intended to determine if there was a need to dredge behind the dam. So the diver went off of the dive boat, then stood up and said “yeah it’s time to dredge.”
582 |
That river toy is amazing. hahaha! I wish I have them when I was a kid.
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I was staying at a beach house a few years ago, and one night I watched a guy pull his sailboat across the beach into an estuary. I guess they wanted to protect it or something. Anyways, the next morning, the trough created by dragging the keel through the sand, had created a channel for the waves to completely erode the entire bank that had once separated the two.
This was like 5 foot deeper than what it once was, and incredible to see. I bet a time lapse video would have been awesome to see.
69 |
Grady, I started watching your YouTube videos back in high school over 5 years ago. I am now in my last term of my senior year of college about to graduate with a bachelors in civil engineering. I just want to say thank you for marking these videos and helping to inspire the future of civil engineers, and helping them get through their classes!
854 |
Those guys are amazing with their river models. It's just so satisfying to see something that difficult to understand happening in front on your eyes.
747 |
That takes me back to my fluvial geomorphology classes as an undergrad in the 1970s. Playing with stream tables and erosion models was a lot of fun. With all due respect, these issues were fairly well understood by physical geographers fifty years ago. It was the engineers who decided they could control dynamic natural systems with concrete and riprap. No amount of argument could sway them, and the real world evidence was ignored or downplayed. It is still going on, with unfortunate consequences. Sadly, fewer cross-discipline courses are offered these days. In my professional work, I often encounter young people who have never taken a geology, geography, biology, or indeed any sciences courses. How they got through university without any understanding of the natural world is astounding.
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Laughs in Dutch
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That river table is basically my childhood dream toy. I used to get ‘in trouble’ by using the hose to create my own waterways. I still love watching what water does during high rain times today.
194 |
I had not heard of the LA river project until this video. I've been saying for years of California experiencing drought that it's so silly that the river system here is designed specifically to channel our rain water here out to the ocean, and doesn't do anything to harvest it. It warms my heart a bit that there is at least something being done in the direction of potentially fixing some of that problem.
352 |
This reminds me of something I always used to do at the beach as a kid growing up (that my Dad kinda taught me, to be honest). Every time I'd go to the beach, one major thing I'd do (usually with the help of my brothers and/or my dad/friends) is to dig a pit up on the shore somewhere, then dig a channel from that pit down to the ocean. We'd carve twists and turns and even plateaus (which would make waterfalls) and occasionally even tunnels into the channel, then haul buckets of water from the ocean into the pit and watch as the water would flow through our creation. It was always an ongoing project though, as inevitably too sharp of a twist would cause a stream to break through straight and make a downstream connection we never would've forseen. And the waterfalls would slowly erode the cliff until it was no longer a fall but rather a gentle slope (that, or it would simply dig almost a second pit into the ground, creating a little pond along the way as a result). Tunnels would inevitably collapse (usually rather swiftly) as the base was slowly eroded away, causing a huge lump of sand that would either force a ton of new channels to form or would be quickly eroded away, depending on, well, whatever it depended on.
It was always so incredibly fun, and is a game I very much hope to be able to pass on my kids some day. Taught me a ton about how rivers work without me ever realizing it lol
14 |
I am from a small city, which has a small river flowing through it and I remember from my childhood when either fishermen or city council was actually digging up the river where the sediments would collect (keeping it in mind that the river emerges from a lake and has a dam in it's path). This way the stream was decent through out the seasons. Now, as they have stopped doing so and the dam has been privatized, the flow of the stream has been drastically reduced, fish are almost non-existent and the stream feels super slow. I feel like that if they had continued with the sediment removal, the river would stay in it's path and yet fed the surroundings with it's goods.
11 |
the idea of 3 grown adults playing in a indoor sandbox with working, realistic fluid dynamics really makes me smile. Men never grow up. our toys just get bigger, fancier, and more expensive.
628 |
Discovering an old topographical map series from surveys done in my area around 1910 shows how a lot of small creeks and streams have been diverted, or eliminated because the land they once drained has been substantially changed. While we look at the main river, I wonder what models that included a before and after of this process would tell us. Another factor isn't what we've added to streams and rivers, but what we took away-- the beaver.
195 |
Awesome video! I was in the bayou in the Atchafalaya basin. The locals told us the water has been rising, things are changing. Loved learning more about rivers.
5 |
@PracticalEngineeringChannel
1 year ago
💧Huge thanks to the Emriver team for hosting us at their headquarters and helping to produce these videos! Check them out at emriver.com/ 💡Level up your math and science skills with Brilliant: brilliant.org/PracticalEngineering
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