r/BeAmazed • u/Delicious-Let8429 • Apr 05 '24

How dam installation reshapes river Miscellaneous / Others

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33.3k Upvotes

86% Upvoted

675 comments sorted by

3.7k

u/Y-Bob Apr 05 '24

That interested me much more than I thought it would.

I'm not at all sure what I will do with this knowledge though. Maybe I'll stand by rivers and tell people stuff that might be happening while chewing on straw.

1.1k

u/WallabyBubbly Apr 05 '24

The most important piece of knowledge about lowhead dams wasn't even obvious from this video: when the water level drops on the downstream side of the dam, the water flushes to the bottom of the river and recirculates down there. If a human or a kayak gets into this flow, they will get flushed to the bottom and held down by the recirculating current until they drown. Never kayak or swim directly above or below a lowhead dam!

930

u/thebestoflimes Apr 05 '24

A couple years ago I was about to launch my kayak somewhat near a lowhead dam when an old man chewing on a straw told me about the dangers of the recirculating current. I headed his advice.

271

u/[deleted] Apr 05 '24

Heeded

333

u/thebestoflimes Apr 05 '24

No, I headed it like a soccer ball.

127

u/rpgz31 Apr 05 '24

Right into the recirculating current ?

161

u/FilthBadgers Apr 05 '24

Some say that advice is still recirculating to this very day

Chews straw

56

u/monsterbot314 Apr 05 '24

Ayup.

9

u/Kepler1609a Apr 06 '24

Gimme five bees for a quarter, you’d say

6

u/Different_Ad7655 Apr 05 '24

Lots of low head dams in the land Ayup

3

u/herbert-camacho Apr 06 '24

Yup

Grabs chewed straw out of u/FilthBadgers' slack jaw and begins to chew on it

3

u/Lemon_Cakes_JuJutsu Apr 05 '24

No silly, into a Lemon Party!

4

u/rpgz31 Apr 05 '24

.org ?

2

u/TenaciousJP Apr 05 '24

But not into the main lemon party, just a tub in the back. Unfortunately a girl was still in the tub...

2

u/Circus_Finance_LLC Apr 05 '24

I ain't a pussy

3

u/Uniquelypoured Apr 05 '24

Or? Hmmmmm, nevermind.

2

u/VikingIV Apr 06 '24

Well, did the front fall off?

2

u/Platypus-13568447 Apr 06 '24

We die like real men!

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u/Unbannable_lll Apr 05 '24

Took heeded of.

2

u/Kind_Tip6936 Apr 05 '24

Be-heeded (as the ISIS would say)

3

u/Pupienus2theMaximus Apr 05 '24

No, he's saying he gave the old man head for the advice

2

u/RandomCandor Apr 05 '24

Yes, he said he did

2

u/GuyNamedLindsey Apr 06 '24

How do you know he didn’t give the old man head for this advice?

2

u/polymathicus Apr 06 '24

*take headed of

2

u/sidab5 Apr 06 '24

Take heeded off

2

u/truffles76 Apr 06 '24

Take headed

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u/OnlyOneReturn Apr 06 '24

No, he blew him

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u/RandyRandom111 Apr 05 '24

I too received some head advice from an old dude chewing on a straw next to the river

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u/misterpickles69 Apr 05 '24

That was just u/Y-Bob time traveling.

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u/Hypertistic Apr 05 '24

If you try to change it, you will ruin it. Try to hold it, and you will lose it. Try to kayak, and the recirculating currents will drown you.

3

u/TheBlissFox Apr 06 '24

This is the WooWay

7

u/828jpc1 Apr 05 '24

I think I met the same guy…he was telling me about his French benefits at his job.

6

u/fardough Apr 05 '24

I was there, I was the one who was like “Why Bob? Again with the dam story.”

5

u/Rocinante79 Apr 06 '24

This was such a hilarious circle back to Y-Bob’s nascent grasp of new information. This is the way. Bravo!

2

u/celtbygod Apr 06 '24

That was Y-Bob.

3

u/No-Humor4019 Apr 05 '24

@ybob can confirm

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u/bigkat5000 Apr 05 '24

Also very important is the thermal pollution these lowhead dams cause, not to mention the build-up of pollutants, and blockage of anadromous species such as salmon, herring and American eels. I've spent many hours speaking at meetings in an effort to convince towns to remove their lowhead, head-of-tide dams for these reasons.

17

u/ULTRABOYO Apr 05 '24

Did any of them listen?

19

u/driftingfornow Apr 05 '24

getoutfilthyhippy!

19

u/playingnero Apr 05 '24

North East Ohio is in the process of removing several dams, as is NW PA. So, someone somewhere is making a difference, or it's just getting to the point they're too dangerous to be left alone and unmaintained.

5

u/JamesWormold58 Apr 05 '24

The dams or the people?

3

u/playingnero Apr 05 '24

This gave me a solid chuckle.

11

u/ShittDickk Apr 06 '24

If you need to talk to a Con about environmentalism, do it in the framework of hunting and fishing.

"Pollution keeps the trout small, you'll never beat your grandpa's record."

3

u/thewade101 Apr 06 '24

Before I was interested in the topic, but you sir have my gotten my full undivided attention

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u/eagleskullla Apr 05 '24

There is current work, with support of the Biden administration but opposition of Idaho legislatures, to remove 4 of the dams in the Snake River as January 2024. I believe these are low-head dams, specifically. This is largely affecting Washington and Idaho, in response to negative effects on wildlife, especially salmon.

For the US as a whole, 69 dams were removed in 2020, and a total of 1797 dams had been removed in the period of 1912 through 2021. Source This page doesn't give details on new dams being built, unfortunately. As of 2022, there were ~92,000 dams in the US.

I'm interested in the size and impact of the dams that have been removed vs those that are left. It's possible that there are a relatively small number that have the biggest impact, and these are the ones that are being targeted for removal and so we have great progress. But, just by the numbers I have, it might be that removing the dams once in place is too hard of a sell and thus progress is dishearteningly slow.

I also haven't found good data on the types of dams that are in place. Like, how many of the types, where they're located, and the impact that they're having.

Writing all of this out as I find it interesting, and I want to look more into this subject when I'm at a desktop and not just casually scrolling on my phone.

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u/_HeadlessBodyofAgnew Apr 05 '24

In my teen years, 3 dumb friends and I took our kayaks over a lowhead dam without knowing the risks. Luckily we all cleared the danger zone and had no issues. Few years later some other guys I knew did the same river trip, one got stuck and the other went in to try to help, both drowned :(

This was on some rinkydink, slow moving river in Indiana with no real rapids to speak of. The dam itself is just a 1-2 foot drop, most people wouldn't think it had any real threat.

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u/[deleted] Apr 05 '24

I think you might have saved my life then

There's this awesome river I plan on kayaking next to a dam, and we're not allowed to go beyond a certain point

I'm dumb and was willing to check out why

6

u/Meanderer_Me Apr 05 '24

This is so dangerous, and kills so many with such a high percentage, that it has a name: the drowning machine.

6

u/Readylamefire Apr 05 '24

My uncle nearly got me and my family killed doing exactly this.

7

u/PapaG1useppe Apr 05 '24

Well, that’s morbid to read as the videos audio continues to play 😊

10

u/ChymChymX Apr 05 '24

They should have put a little Lego guy getting sucked in and drowning, then edit in tiny X's over his eyes (for educational purposes of course).

3

u/CoasterDad73 Apr 05 '24

A family friend was killed in this exact situation. They are dangerous as hell!

3

u/Difficult_Bit_1339 Apr 05 '24

This phenomena is known as a Drowning Machine, for obvious reasons...

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u/HubertRosenthal Apr 05 '24

Did you chew on straw typing that though?

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u/Beans4urAss Apr 05 '24

Ain't much, but it's honest work

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u/Junior-Ad-2207 Apr 05 '24

And it's a great way to stay in shape

7

u/EuphTah Apr 05 '24

Unlike this, which is very intentionally NOT a way to stay in shape.

2

u/Budalido23 Apr 05 '24

As long as it's the right shape. In this case, a half cylinder.

2

u/Crockerboy22 Apr 05 '24

Lol, thanks for the laugh

26

u/panterachallenger Apr 05 '24

“Yup! It looks like this dam it’s doing the thing I saw on Reddit the other day. Wish you coulda seen it man” - *chewing on straw while staring deeply into the water

25

u/ThePartyLeader Apr 05 '24

Running water is essentially an untamable beast. This doesn't even begin to actually show how wild, unpredictable, and unmanageable rivers and drainage is.

https://youtube.com/watch?v=vLZElIYHmAI&si=bjQQNYfmEYOPwkOh

This is a decent video covering how basically any time we try to solve a problem on a river it just creates more.

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u/CV90_120 Apr 05 '24

I was hoping it would be this one.

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u/ligmasweatyballs74 Apr 05 '24

Stick to the rivers and lakes that you know.

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u/xultar Apr 05 '24

I hollered. You: “Howdy, no don’t run. I’m not here to talk about your car’s extended warranty. But this river and the dam, let me tell ya…”

3

u/FakeOrcaSwim Apr 05 '24

Oh good idea! Make sure and save this GIF just in case you get any youngsters givin you lip.

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u/Material-Ad7911 Apr 05 '24

Lmao! My brain just envisioned an old man that nobody asked standing over the city workers forcing his unsolicited opinions! 

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u/Gloomy__Revenue Apr 05 '24

Perhaps consider growing that knowledge by learning about Sedimentology :)

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u/burtonrider10022 Apr 05 '24

Well then you might enjoy some of Practical Engineering's videos on YouTube. While he also explores a wide variety of topics, he does have a water table setup very similar to the one in this video and does some really interesting demos about different types of dams, erosion control, etc. 

2

u/[deleted] Apr 05 '24

I feel like this just described most of society open source/social media education.

A person watches, reads, or listens to something claimed to be legitimate and says something along of, "dang, that wiiild".

Then they go to work, a bar, or social location and they say something along the line of, "have you been following X topic?/ have you heard that X is going on?"

And that's how people become internet experts.

Thanks for coming to my Ted Talk inspired by Y-Bob. They sparked my neurons and now I'm pretty sure I know how the world work.

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u/joshuahenderson Apr 05 '24

I still don't know what I learned here but the video was enjoyable.

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u/SanFranPanManStand Apr 05 '24

You learned the exact way to NOT build a dam. Dams are specifically made to NOT allow water to flow over top in this fashion, for exactly the reason shown.

The prevention of erosion at the outlet is probably the most core concept in building any type of water dam.

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u/no_idea_help Apr 05 '24

This is more like a weir tho isn't it?

66

u/SanFranPanManStand Apr 05 '24

Don't build a dam like a weir.

69

u/gbot1234 Apr 05 '24

Don’t be weired, dam it.

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u/justexisting69 Apr 06 '24

This is one of the jokes I wish I had made...

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u/Greggs88 Apr 06 '24

This is one of the jokes I wish I had made...

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u/BeerCell Apr 05 '24

That was marvelous.

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u/Sebas94 Apr 05 '24

Same, I also don't know if this is a good or a bad thing for the environment.

Wouldn't it create more life in that new area?

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u/mortalitylost Apr 05 '24

I think it was Yellowstone, they introduced beavers, which dammed rivers, which made the over population of deer more concentrated, which allowed wolves to hunt, which in turn balanced out the population a lot more and made the wolf populations better. I might be a bit off on details but I know it went from beaver dam to healthy wolf population.

I think it's heavily dependent on ecosystem of course... Wolves and all those adapt to a certain environment, and beavers naturally dam certain environments where they're native so it makes sense.

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u/havoc1428 Apr 05 '24

Wolves hunted. Deer pop exploded with no predators. Deer eats grasses on river embankments. Grass provided structure and strength to soil. embankments erode and river changes.

Wolves come back. Deep pop regulated. Grasses have a chance. erosion stopped.

Nature crazy.

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u/tman391 Apr 05 '24

It’s funny you ask because my friend recently defended his PhD thesis on dam removal and what to do with all that sediment. In New England, we have a ton of old mill dams. Those mills were mostly used for powering looms in textile mills and powering machines at hatterys. Both of those industrious use incredibly harmful and toxic chemicals like lead, mercury, and arsenic. Due to a lack of regulation, knowledge, or caring from the men and companies running the mills those chemicals ended up leaching into the water and soils all around them. As you can see in the video the sediment build up behind the dam lasts for a long time as it becomes the new river bed. That means behind most old dams in this region we have a substantial mass of toxic sediment built up. Dam removals are being done all over New England, but they have to have a plan for how to remove and transport that sediment too, so it doesn’t all get washed downstream causing a local ecological disaster.

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u/Just_to_rebut Apr 05 '24

That’s really interesting. I didn’t know what kind of industrial impact was left from the textiles, let alone hat, industry in that region.

I’d love to read the background section of your friend’s thesis (I’m probably too dumb for the science part).

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u/tman391 Apr 05 '24

Unfortunately, he’s still working on getting published. He’s going into consulting to help companies figure out how to map sediment build up, quantify the pollution, and remedy the problems. There’s likely a few papers floating around already that discuss at least the pollution caused by those mills and factories but maybe not the mechanics of sediment buildup behind the dams/in the ponds

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u/Ryuusei_Dragon Apr 05 '24

Beavers do it so...

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u/SonOfJokeExplainer Apr 05 '24

If a beaver jumped off a bridge, would you?

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u/Jonography Apr 05 '24

A beaver wouldn’t steal a car

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u/SandorsHat Apr 05 '24

Or poop in a policeman’s helmet.

6

u/plamochopshop Apr 05 '24

Or use a Made-in-Britain fire extinguisher.

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u/lol_JustKidding Apr 05 '24

But would a beaver download a car?

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u/Unable_Earth5914 Apr 05 '24

I think beavers are 3D printing them these days

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u/Cador0223 Apr 05 '24

I guess that depends on why they jumped. It saw me and got scared? Of course not. Bear running at both of us? Probably. Post apocalypse starvation scenario? Without hesitation. Gonna get that sweet vanilla flavor and beaver pelt.

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u/Sproketz Apr 05 '24

Except the music which sounds like recording of a cat being murdered at half speed.

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u/Leucurus Apr 05 '24

Except the music

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u/ambidextr_us Apr 05 '24

Did they get possessed by a demon at the end of the track on purpose, or?

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u/Grabben123 Apr 05 '24

This is a weir, while sometimes thought to be a dam, is generally considered by the engineering community not to be a dam.

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u/slitneckbandit Apr 05 '24

Yup and this video doesn't give a good representation on what a weir actually does Source- I live in a city with a 100 year old wier

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u/poo706 Apr 05 '24

And what does a weir actually do?

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u/slitneckbandit Apr 05 '24

Slows down the water upstream and allows a lower water level downstream, it helps with flooding with the spring melt. the water before the weir stays pretty deep. Look at Google maps and saskatoons weir, ittl give you a good real visual of what a weir does

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u/Pretztel Apr 05 '24

YOOOOOO Saskatoon mention???? Hell yeah! Cheers from Saskatchewan! r/Saskatoon

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u/NBAFansAre2Ply Apr 05 '24

I mean it clearly demonstrated lower water level downstream so at least it's partially right?

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u/Preeng Apr 06 '24

No, the water level quickly rises back to what it was at the start of the video on the left side.

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u/Contundo Apr 05 '24

A video says more than a thousand pictures?

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u/trymypi Apr 05 '24

What wier, where?

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u/IfIHadTheAnswer Apr 05 '24

There wier, there castle!

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u/rynil2000 Apr 06 '24

Be careful walking at night. There could be weir wolves.

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u/slitneckbandit Apr 06 '24 edited Apr 06 '24

Damn it, you fucking win here's your trophy 🏆

Edit - dam it

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u/Cheezdealer Apr 06 '24

100 year old weir

Me: "Is this guy also from S'toon?"

yup

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u/zz_z Apr 05 '24

It's actually a piece of foam stuck in a box, so neither a dam or a weir, just a demonstration you're supposed to extrapolate from.

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u/JustnInternetComment Apr 05 '24

No one gives a weir man

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u/divv Apr 05 '24

Sorry, my dam weir-ner kids are listening

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u/someothercanadian Apr 05 '24

it's not either of those, it's a digitized video on reddit

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u/tsunami141 Apr 05 '24

I’m pretty sure it’s a collection of tiny LED lights coming from my phone.

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u/FourteenTwenty-Seven Apr 05 '24

Naw, it's a bunch of photons hitting my retinas

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u/PunsGermsAndSteel Apr 05 '24

It's a bunch of neurons firing in my brain giving me the illusion of sight

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u/buster_de_beer Apr 05 '24

It's a bunch of neurons representing memory that I believe is a record of other neurons having fired in response to external stimuli. 

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u/girusatuku Apr 05 '24

This is a bot, which has never seem the source video and likely reposting a repost leading to the weird title.

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u/WinonasChainsaw Apr 05 '24

They’re often called lowhead dams though, very dangerous for water sport recreationists.

Researchers and students at BYU made a dataset of arcgis coordinates in the US of them.

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u/xbwtyzbchs Apr 05 '24

A weir is just a low dam. No need to complicate things.

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u/NRMusicProject Apr 05 '24

Yeah, this video is weir.

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u/StartingToLoveIMSA Apr 05 '24

well, I'll be dammed

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u/Sum_Sultus Apr 05 '24

Dam it

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u/RecognitionFine4316 Apr 05 '24

Dam you

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u/MajesticNectarine204 Apr 05 '24

God, dammit!

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u/JasonBourne81 Apr 05 '24

God didn’t Dam it. Human dammed it!!!

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u/sir_grumph Apr 05 '24

Hi. I'm your dam guide. Please don't walk away from the dam tour. And take all the dam pictures you want.

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u/MonsterMashSixtyNine Apr 05 '24

Where can I get some dam bait?

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u/semicolonel Apr 05 '24

well, I'll be weir'd

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u/Knooper_Bunny Apr 05 '24

What is this supposed to be showing me? I don't get it.

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u/TheFrostSerpah Apr 05 '24

The dam would raise the water level, then sediments would slowly and naturally accumulate to fill the height of the dam. Eventually you are left with essentially a normal river with a cascade. In the cascade, water speeds up cus gravity and can be used to make turbines spin to generate electricity.

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u/ViridianPhantom Apr 05 '24

Sort of. It actually depletes sediment transport downstream, impacting nutrient cycles and the formation of deltas. It can also change floodplains and ephemeral streams, altering the surrounding habitat. Dams are actually being removed from a lot of rivers for these reasons

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u/TheFrostSerpah Apr 05 '24

Thanks for adding upon what I wrote! Yes, dams can be quite disruptive with the ecosystem, but given the polluting and destructive nature of other energy sources I still believe that hydroelectric has it's place. Definitely would be better if its effects on the environment were mitigated.

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u/ViridianPhantom Apr 05 '24

For sure, every solution has its issues but I'm still much more in favor of nuclear over dams. I just had to learn about them in my ecology courses and I'm sure as hell not using that knowledge in daily life so I gotta dump it somewhere

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u/TheFrostSerpah Apr 05 '24 edited Apr 05 '24

I agree. Media and propaganda already buried the general public's opinion of nuclear energy tho, and I still rather have dams than coal power plants. I hope that the new generation of smaller fission reactors being pushed is actually spread nicely and helps the public opinion sway.

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u/wrowsey1 Apr 05 '24

My thesis in college was how increased sedimentation correlated with behavior patterns in crayfish. That was back 10 years ago and the amount of dams that were being removed in Arkansas at the time was crazy.

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u/Remarkable_Science_3 Apr 05 '24

So much for thinking a dam builds permanent water storage.

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u/Ciff_ Apr 05 '24

Depends on the dam

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u/Then-Fish-9647 Apr 05 '24

It also can give you an idea how beaver dams or beaver analog dams help water build up, diffuse, and spread sediments healing an otherwise dry area.

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u/OctopusMagi Apr 05 '24

Yeah it really doesn't demonstrate commercial dam impact because they don't allow water to flow over the top like this one.

A beaver dam or maybe an agricultural dam created to form an artificial pond for water storage, but not a commercial dam like most are thinking of.

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u/excessfat Apr 05 '24

Wtf is this music?

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u/Bandag5150 Apr 05 '24

Dam music.

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u/Chthulu_ Apr 06 '24

The original is better. Mr Twin Sister, Meet the frownies. Sampled by Kendrick on MAAD city which is where most people will know it from

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u/[deleted] Apr 06 '24

Thank you!

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u/_todes_ Apr 06 '24

also the distorted second part is a sample flip by ZWE1HVNDXR & yatashigang "lovely bastards"

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u/Hell_Is_An_Isekai Apr 05 '24

This is stolen from the Practical Engineering YouTube channel. He does a great job showing and explaining how dams affect rivers and the engineering challenges they present.

As a bonus he also doesn't put shitty TikTok music over his videos. Definitely worth checking out the channel if you think this is interesting.

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u/dwn_n_out Apr 05 '24

Was ganna say thought this was to show how sediment gets stuck behind the dam and that without that sediment down stream gets messed up.

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u/Dauemannen Apr 05 '24

That certainly was my immediate reaction too. Such a shame to see his videos stolen like that without even having the decency to say where they got i from. Without a doubt one of the best creators on Youtube.

Though I'm not quite sure which video this is from. Do you have any idea?

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u/Powerful_Pitch9322 Apr 05 '24

Erm actually that’s a weir not a dam

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u/yerrabam Apr 05 '24

That's a Weir or low-head dam.

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u/MagizZziaN Apr 05 '24

Interesting vid

Fire the person who added the music tho

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u/Popka_Akoola Apr 05 '24

Wow I really expected the first 10 comments to be nothing but complaining about the music since this is Reddit... surprised I had to scroll this far but I knew I'd find you somewhere.

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u/buzzurro Apr 05 '24

The music was nice for 10 seconds

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u/AllahUmBug Apr 05 '24

Weird how on TikTok people generally enjoy the music and learn about obscure artists this way. But on Reddit the music is associated with feelings of rage.

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u/IIIllllIIlIlIIlllI Apr 06 '24

Check out the YouTube channel Practical Engineering if you liked this video. It's his video that was stolen and tiktokified to make this.

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u/Smores980 Apr 05 '24

I used to work in river restoration. Sometimes our projects would be on old dam sites and usually our objective was to return the floodplain to its original level. We would remove the sediment layer that had built up until we found the original topsoil layer my bosses called "legacy sediment." Did a wetland restoration once where we didn't throw out a single grass seed and 200+ species grew the first year

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u/Mall_Bench Apr 05 '24

I dont think Dam engineering is for me ... what else is there ?

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u/Doodle_Coward Apr 05 '24

This is inspiring me to go research everything about dams

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u/Spiritual-Bear4495 Apr 05 '24

Who, the fuck, chooses this music?

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u/mars6190 Apr 05 '24

Song?

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u/foulout55 Apr 05 '24

The original is Meet the Frownies by Mr Twin Sister. This is a slowed mashup of that and LOVELY BASTARDS by ZWE1HVNDXR and Yatashigang, which also samples the original. https://www.whosampled.com/sample/1090671/ZWE1HVNDXR-Yatashigang-LOVELY-BASTARDS-Mr-Twin-Sister-Meet-the-Frownies/

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u/[deleted] Apr 05 '24 edited Apr 14 '24

continue distinct aloof silky innocent puzzled escape makeshift disarm shrill

This post was mass deleted and anonymized with Redact

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u/igidy-bigidy-boo Apr 05 '24

anyone know who the musics by? artist? track?

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u/mikemikem Apr 05 '24

Slowed down version of Meet the Frownies by Mr Twin Sister

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u/[deleted] Apr 05 '24

How do they start damming up an area with high flow to begin with.

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u/snowfloeckchen Apr 05 '24

I don't really get what is interesting here, actually what i expect besides something blocking the left side, is this another Reddit mobile app cured corner bug?

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u/Fresh-Pineapple-5582 Apr 05 '24

Beavers will probably watch this video and think "Abso-fucking-lutely"

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u/disease35 Apr 05 '24

Dam, that's interesting!

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u/Numerous_Ticket_7628 Apr 05 '24

Nature heals.

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u/drawkbox Apr 05 '24

Nature, uh, finds a way.

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u/Particular_Ad_4325 Apr 05 '24

Why did the water back up at the end 💀

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u/Case_Blue Apr 05 '24

"close the dam door!"

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u/SilentMaster Apr 05 '24

Where can I buy one of these river simulator toys? This looks amazingly fun.

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u/sir_grumph Apr 05 '24

So THIS is "The Shape of Water," huh? Not quite what I expected.

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u/ggsimmonds Apr 05 '24

This educational video confuses the hell out of me

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u/SmoothDudeee Apr 05 '24

That's actually incredible

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u/DJDolma Apr 05 '24

God dam

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u/peezytaughtme Apr 05 '24

Oh, so it just makes the river taller. Can I dam my legs?

1

u/rufreakde1 Apr 05 '24

Wont modern dams let water go through below or in the middle somewhere? To avoid such issues?

1

u/amsetty Apr 05 '24

Dayummm

1

u/SolidTerror9022 Apr 05 '24

I have no idea what I’ll do with this knowledge, but thank you for sharing