Model Dam Fail 

probably why dams arent made entirely of sand

Hmm. RU-vid recommendation algorithm needs work.

Valuable lesson learned. If I see 4 trucks on the top of a failing dam. Get in the yellow cement mixer.

Why did I watch this

what the fuck youtube? why I have this video on my homepage?

this video is in my youtube homepage. In the recommended section. wtf.

Well there's 3 minutes and 36 seconds of my life that I'll never get back.

1980s : We will have flying cars. 2009 : Group of people watch a Model dam fail.

Ironic that the only truck to survive was the cement mixer...

I was in the yellow truck that survived and boy let me tell ya that was some scary shit

I’ve officially got to the end of the internet.

What is this doing in my recommended?

camera awareness is a good social skill to have

Hey guy in the black sweater. Yes you. Quit stepping in front of the camera. K, thanks.

Damn failed

This is a poor representation of hydrolysis & soil compaction. Water travels the path of least resistance, and the saturation of the soil seen at the bottom/side of the dam demonstrate this point. Dams aren't built with sandy/silt soils, above/on a slick, non-binding surface. Clay is typically introduced along the bed and walls of an engineered dam base or pond, and compacted in layers to prevent major soil movement. The presence of the water against a clay embankment changes the orientation of the clay platelets, the basis for soil movement/hydrolics and even though the hydrolics, at some point, would be present all along the dam base, which is the soil movement in this instance, that lateral force is retracted by the sheer mass of soil behind/beyond the water point of contact at the bottom of the dam. All soil reaches a "plastic" state, when its saturation reaches a certain point causing hydrolics or, movement of soil. Compaction is introduced, along with aggregate at times, to counter act or stabilize the wall of any earthen barrier in the presence/possibility of hydrolics - soil movement. Engineers typically formulate bearing pressure against soil when introducing a load, or, in this instance the hydrolic pressure of the water when calculating resistance. It's the same approach used when the federal highway administration built the interstate systems all across the country. When they needed dirt to fill a grade in the roadway - to bring a stretch of highway up to grade, they excavated ponds along the route - some of which became retention ponds for roadway run off from storm water, and then lined the base of the ponds w/either a sandy clay or a non-porous fill so as to contain the water in those ponds, keeping them in place. That salvaged many man hours/hauling fill needed to bring the right of way up to grade, and allowed for efficiency & economy. However, the fill placed in the road bed from what was available within the construction right of way wasn't always stable soil, hence, the constant & ongoing paving/resurfacing of some of those roadways, due in part from poor/unstable soil placed in the right of way...but that is another conundrum.

such a dam shame

I have no idea how I got to this video

Thanks,I was just about to go out into the backyard and build a dam from sand, dodged a bullet there. Thanks professor.🇦🇺

Watching in 2019 I can say: The engineers of Vale do rio doce were absent in that class.

This is the kind of stuff I did as a kid. I could have kept doing it and made a career out of it!?!?

Why was this so satisfying to watch

Просто эпическое зрелище, блин! ))))) Мы с друзьями ещё в детстве такие запруды строили во дворе, а тут целая наглядная демонстрация с кучей народу ))))) У них что, детства не было? ))))

By putting the dam in that container they made it easier for water to penetrate at the edges, combined with the fact that this was done with bare dirt when earthen dams would have at least grass to prevent erosion made it much easier for the water to break through.

I don't know why I'm watching this damn stuff....

C'mon, you let the internet watch 2:45 mins of a tub filling with water? Obviously, im saying you all should fast forward to 2:45 (and make sure you vote!). Some of you may not like it this video has a deceiving title, or if +Jon TheTechy were to trim the beginning of the video significantly then it would become better rated! Could even go viral if posted in the right subreddit.

The only problem I see with this experiment is that the plexiglass is very slippery especially when wet and natural earth is much more grippy than that. You should glue sand paper to the bottom of the tank them try I would be curious about the results

Thank god we have enough brains to not build dams with just sand.

its 3 am wtf am i doing with my life.

that was the most exhilarating thing i ever witnessed in my life

ラオスダム決壊事故の参考資料に役に立ちそう。

Is this how god sees a flood disaster on earth?

Its a dam shame.

RU-vid knows what I like.

Why do people randomly record stuff yet get more than one million views from it

Impressive, but from a hydraulic engineering standpoint, the model is floored. It failed only because of the water pushing the base of the sand along the slippery Perspex bottom. In reality dam walls are not built from sand, they are built from reinforced concrete. The base is also tied in deep and anchored.

This is why they don't build dams out of sand.

I used to play in the mud when I was little.

Why is this recommended to me, 9 years later?

Three and a half minutes of my life I'll never get back

Why am I watching this damn video?

What is this!?............A dam for ants??

My thoughts and prayers go out to those brave workers atop the damn who heroically stayed to the end RIP

I feel bad for the person who built this. 11 million people saw it fail. 😂

This biggest fail was the guy continually blocking the view.

Always someone HAS to walk in front of the camera.

Try try bus don't cry...😙😙 Make it again show them you are the real civil engineer. Be positive!

Наглядный пример экономии на строительных материалах.

They didn't even TRY to save the poor construction workers in the vehicles. RIP

This shit doesn't mean any thing. If it is a RCC dam, there shall be a CORE in the middle of the dam and a water proof surface against the reservoir, the core can strengthen the dam itself and the concrete surface would stop the soaking. This shit won't happen in real life, no one would allow it.

You need to name this asmr damn dam fail ;)

Algorithm worked for me. I’ve watched a few of these experiments. It’s interesting to see what works and what doesn’t. And how fast it fails when it eventually does

Why is that fool moving in front of the camera repeatedly

What a huge waste. So you mean to tell me the dam fails when you pour water up to it's very apex? You guys couldn't wait another 3 minutes to watch it fail reasonably you had to keep adding water until it nearly crested the top and washed it away.

Holy shit... You fill water to the top, and it goes over the top?! Thank you, science!

I'm sure in the last 9 years this observation has been made, but I think I saw bubbles coming out from the sand right before it started to collapse. I think that the pressure of the water permeating the sand would force any air between the sand particles out in such a way, and push the sand apart, where the bubbles escape. One solution might be to put some straws or tubes into the ridge of the dam, above the water level to release air that way. Could be wrong, but it's something I'd try.

So you're telling me that if the water gets higher than the dam, the dam stops working? Wow, fucking crazy.

Welcome to the levees in New Orleans.

This is a rather simple experiment without any requirement to write any programmes. Primary school standard

this is why those children will fail in civil engineering

This isn't a real world example of how an earthen dam is built. They often have waterproof faces on the reservoir side - usually concrete but also could be large rubble or other protective substances. The core of the dam is given an internal layer of waterproof material like clay or some types of silt that are very water resistant. The dam is expected to become waterlogged in certain areas so this is calculated and pathways for unwanted saturation are provided inside of the structure. Then the internal water barriers prevent the water from causing the fail that is shown in this video. Basically, this video is as big a waste of our time watching it as my time was in trying to make the truth of the matter more clear.

John The Techy Not a realistic experiment. You over loaded the design requirements by letting the water level rise above the dam. No spillway to protect dam from over flow. No hardened base below river bottom. No soil or clay. What you did is more of a game than an adequate teaching event. Silly project for you engineers; wasted opportunity to teach real hands on Physics. Did you show a real cross section of a existing earthen dam? If you had the children would have created a more real model dam to learn Physics.

My favorite part is where the guy keeps walking in front of the camera.

What I've learned today: Beavers are much better then humans when it comes to dam construction.

What IS this? a DAM FOR ANTS?

But damns don't rest on slick plastic or glass base.

certain points to be considered for prototypes: 1. the construction material doesnt appear to be having min cohessive content. Sample appears to have all snady soil. 2. no reinforcement like fibre sheets are visible 2. hope that dead load and friction have been taken into account on acreylic surface ( maybe there is provision for the some at point of contact ..which is not visible). 4. the source of water considering the size and exposure to water is very turbulent. Calculated degree of Quiescence might be required.

When you make four memes and only one survived

> 4mil views and half the comments are like "wtf am I doing here". lolz. I don't know how I got here either.

that was a dam failure...

The question is: who is going to clean this damn disaster?

Главное знаешь чем закончится (все игрушки смоет и всё превратится в кашу), но всё равно смотришь...детство)))

Room full of damn failures.

You failed your dutch citizenship test

My condolences to the families of the workers lost.

Basically bunch of kids playing with their toys and feel scientific at the same time

There's always "that" person that has to stand in front of the camera. STFA!

These guys are way to serious about this... I used to build damns in my yards driveway all the time, but yeah I was like 5

Exatamente assim q aconteceu em Brumadinho, Minas Gerais, Brasil.

Except for the fact that modern dams are not made by piling up loose sand.

Would be better if... 1) invest in a tripod 2) tell the nerd with the sheet of paper to GET OUT OF THE WAY OF THE CAMERA! 3) turn the water off before it overflows the dam

"This was constructed by school children as part of an open-day and shows them a dam burst or dam collapse." The real children are in the comments

the damn is actually pretty good, the variable no one here is considering is that the rocks at the bottom in reality, wouldnt bee touching just acrylic, so the actual rocks wouldnt displace causing that massive failure, the best option would be to replicate this same experiment, but have at the bottom a large layer of dirt and rocks cover the whole bottom of the acrylic container.

There are 800 people's died and 200 houses are damage. May GOD bless there families . CNN Reporter. Thank you

Suggestion for the next demonstration: DON'T OVERTOP THE FREAKIN' DAM!

Scaled tests like this mean nothing. The rate of saturation doesn't scale properly. The grain size of the sand is way too big. In real life it would be like pea gravel. And the cars' density is way off. Waste of time.

"Lemme just read the hilarious comments till they fill it with water"

It's rare to see a lab technician do some actual work instead of sitting in the office drinking mugs of coffee all day

Thats what I basically did in my whole childhood :)

2:49 Thank me later

can everyone stop with these dam jokes, pun intended

wow.. that's a lesson that we could learn about designing dam.

wow that guy going in front of the camera... good job :)

Why am I watching this... I need a life...

Why couldn't I resist clicking on this lol

Note to self, don’t build a damn on slippery plastic 😂

I love ignorant people that are like "Oh you're video taping this? Well I'm gonna walk an than stand right in front of the action."

"Hmm, something is about to happen...better make sure I stand DIRECTLY between the camera and the action!"

I dont know why, but this is satisfying..

I thought that thumbnail was a freaking parking place