I hope you enjoyed the video on weirs. I would be truly grateful if you can support us on www.patreon.com/Lesics .Without your support our educational service won't be sustainable. Cheers Sabin Mathew
@@shyamtripathi2097 Hi, I didn't realise our audience would be so much interested to understand the physics behind the zig-zag weirs. I will definitely explain it in a dedicated video.
It's good explanation, but it feels a bit incomplete, because it doesn't explain why the zigzag weirs changes the heights of the stream relative to the straight weirs, given that with both the water falls from the same height.
Sorry for skipping the physics part of zig-zag weir. I didn't expect this much curiosity around this topic. We will definitely explain it in a different video.
This channel is awesome for integrating the authentic demonstrations with the english graphics. I have enjoyed seeing the real team show real physics models recently along with the narrator guy.
Perhaps you could include a safety warning because many weirs are unsafe. The unsafe ones create a recirculating hole below the weir that spans from bank to bank so that a caught swimmer can only get out by diving down to the fast moving water. Relatively safe weirs have eddies at both sides such that a caught swimmer or boat can swim left or right to get to either eddy and get out of the water. Of course, not everyone knows to swim to the side but it a least gives you a chance. I don't know if that sawtooth makes things better or worse. If a swimmer gets into the point of that tooth, will the water push them along the tooth and out or keep them securely trapped at that apex? (I assume the former but I don't know for sure.)
You didn't tell us how it works, so I'll tell you. Theres x number of cubic feet of water moving down the river It all has to go over the dam. If the dam was 20 ft wide, the water backs up because the dam is so narrow. The wiers zig zag shape, if you pull it out strait is like have a dam that 3, 4 or more times as wide. The liner feet of the dam is much longer. So it acts as if all of a sudden the dam is tremendously wide and the cubic feet of water needing to rush over is drops in height and slowly falls over the dam. Hope I explained that so you understand. The depth of the zig zag allows the cord length to be what-ever is needed to get the max flow to a manageable velocity going over the dam.
The video really demonstrated the concept of weir in a really simpler and easier manner, I really appreciate your efforts and hardwork, but we were also curious in knowing the physics behind zigzag weirs
It is because of “volume”. If you take the total “length” of the area that water overflows and multiply by the height of the overflow then you have the volume available. The velocity is how fast the flow rate must pass through that volume. AKA… a larger drain pipe. Using a zig-zag allows a longer “wall” within the width of the channel. Another alternative is to make a wider channel, but doing things like adding a curve/diagonal wall or waves/zigzags are more practical. The zigzag has other benefits when you consider the force of water applied to it.
It's also helpful to mention falling down a wier is extremely dangerous. One will get trapped in the current and be unable to escape. Therefore weirs are often called "drowning machines".
I drive past one of these a few times a month and always wondered why not build a damn? It took me 13 years to finally understand the purpose thanks to this video😅
Now im not saying the video is wrong but hear me out. 1. It didnt prevent upstream erosion. Erosion happen we just collected it against the weir. This becomes the longterm risk of these systems and in many cases they cant be removed without extreme risk. 2. Maybe Im just saying what was already said. By installing the weir you changed the shape of the rivers flow point from halfmoon to a flat line. The area available for the water to flow was reduced. Resulting in your high upstream height. The other has a longer surface area, allowing for more flow. 3. I find it interesting that you see this as slowing the velocity of the water upstream from the weir. Of course the overall flow rate of the river is going to slow down if your restrict it. The velocity of the water seems to be a result of the area provided for flow. I noticed you didnt mention that but instead had an observational equation to desribe the effect on the water but didnt describe the math that created the effect. 4. Why didnt we mention the erosion taking place down stream will cut a narrow channel now as a result of the faster flow rate but reduced area of flow?
i think those are very good points. i had similar questions, you answered most of them, thanks. also: wouldn't there be a lot of erosion at the downstream side of the weir directly at the weir due to all the turbulence in the water? thinking about it, i recognized my cities weir has additional openings at the bottom and valves with wich they can regulate how much water is flowing over AND under/through the weir at the same time. why exactly would they build it that complicated? has to have a lot of advantages, doesn't it? i thought maybe more constant flow rates and clearence of the collected sediment at the upstream side of the weir or less erosion in general but those are just guesses.
@yotonking2831 it is possible it did. One issue you can see and they did touch on this is the video is that the upstream sides water table changes. It could be 0 do to a high sided river bank, but it could be catastrophic like we see when a lake is formed. It's highly dependent on soil types and the nature of the installation.
i think it decrease vertical erosion but lateral erosion increase on upstream side. And in downstream side vice-versa. also it depends on topography and geology of rock.
@yotonking2831 it may have. It depends on the topography and mineral density of the substrate. If it floods, you can see erosion in different areas. If it pools and doesn't flood, it changes the water tables so it could have unforseen effects.
The key thing I got from this is that the zigzag presents a much longer barrier over which the water flows thus reducing the increase in height for more flow. The narrator didn't explain that very well, but the diagrams did.
simple explanation to zig-zag for those who are wondering: discharge over weir directly increases as the effective length of weir increases the zig-zag path gives the weir a greater effective length for the same river width. and as the discharge from zig-zag length is more than straight length ... the water depth in upstream of river in zig-zag weir dont increase more than straight because it's greater length compensates the required cross section of area for the flow.??
@@paulfontaine7819 Interesting 🤔. My educated guess is that if the downstream river is deep, then there’s more mass of water so more inertia. Thus the kinetic energy of the water accumulated during the time of free fall (because of potential energy) will be lost to friction (so I guess heat?) with the bigger body of water downstream so the effects won’t be the same as when the water levels below are relatively low.
@@Eyes_of_Oryx Practical Engineering has a great video on Weirs. I am no expert, so bear with me on my terminology. They don’t necessarily work better per se, as they’re both weirs. The zig zag pattern allows for more total linear length in the same area as a straight weir. More length means more area for water to flow. The angle, material and shape of the weir will need to be fine tuned for desired flow and turbulence.
Yeah, because that's so simple Europe has a strong push to build back thousands of weirs. Weirs aggravate floods wakes arrive faster and more violently downstream. The small city upstream is fine while the large city further downstream where 2 large creeks combine totally gets flooded without any warning time. The people just die in another legislature. Weirs are also terrible for the aquatic ecosystem. European Union removes weirs to increase drinoing water quakity and filtration. To redudce flood risk fron fast channled flows. They reestabkish natural flooding zones and create artificial rapids for the same flood protection effect. This concrete pouring promo tells youm like 10% of the complex truth. As a white warer kayaker I can tell you how boring concrete channeled rivers are compared to natural flows. I'm by no means into biology or ecology, the difference in wildlife is staggering in a river having weirs vs one with natural water flow regulation. There is very few places were such flood protection is essential and other means woukd not work. That's true for thunderstorm collecting basins or mountain zones where snowdrift piles up. Rare places that have frequent flash flood drainage events. Sites nobidy shouldnlive near the river anyways. Thanks to fertilizers and contraception we can start to move out of such dangerous areas. The need to pour them into concrete is basically gone. The benefit of a species protecting aquatic and floodzone habitat offsetting agricultural monocultures as wildlife reserves is way higher in priorities today. We have to offset fertilizer use. W/o natural habitats for bees and insects no food grows at all for humans. China has taken this experiment far enough that people have to manually fertilize the pollen on every apple tree blossom with a q-tip in some regions where bees are extinct. The most simple use of poured concrete is usually a terrible idea. Go ask some real experts first before engaging in such projects. It's not.that easy.
Mr Sabin Matthews thick accent changes the words he speaks ( begining @ 0.39) so much, it turns his words into a different language altogether. This is not a good thing for an informative, educational, instruction video. I did rewind it some because I enjoy and appreciate Gradys videos so much. Thank you Grady for such fascinating videos.
The difference between weir and dam: Weir let water trough the crest, but dam forbid it. On dam, Water flow through the penstock (or tunnel), mainly for power generator. The height of water on dam is regulated
Dam are use for collecting water to power generator or supply, weir are use for prevent surge of water to downstream. Both are reservoir just structure difference
The graphic of flow area is incorrect on the upstream side. It is determined by the height of water and the effective length of flow over the weir, not the length of the channel upstream. This is why the zigzag pattern is more effective in resisting changes in upstream water level.
Surely there must be a point downstream at which the velocity of the water slows back down to what it originally was? Assuming no change in slope of the land of course.
Introducing a weir does not change the flow area. It increases the flow width and decreases the flow height so the area and volume of flow remains the same.
Such a good explanation with animation and models I really loved it As im a student and not earning now but when i do i will surely support Love from India ❤
Great video but you forgot to mention the downsides of the weir, like how the river became unnavigable by ship and impassable by fish and other river animals. Also, the danger of a catastrophe if the weir is damaged.
I was waiting for you to explain how the linear surface area is what reduces the flow. If X amount of water needs to cross a certain threshold, all you do is add more linear surface there by reducing the overall amount per area.
I'm by no means a mathematician. In fact, I am terrible at math. But I find it odd how this video doesn't ever mention surface area. Isn't that a major component as to why the zigzag pattern is so effective at altering the flow rate and height of the water?
It is the basics of fluid dynamics... This is the logic behind the dams..... I didn't understand why there is lots of viewers are surprised about it.. I believe some where in your child hood we might have done this... Blocking flowing water and see that the height increases on one side of it
Most modern weirs and dams have openings at the bottom and from time to time they get opened to flush out the settlement. There are impressive videos from China where you see a turd like stream of soil getting flushed out from a dam.
the z is not the only way to do this though. I've personally never seen it, here in Germany basically all the weirs I've seen instead opt to follow the falling curve of the water, so they are straight horizontally but curved vertically instead. It's kind of obvious why this works I guess, you have continuous flow all the way top to bottom without any disruption
This may work well but surely has it's limits.For instance if the upper stream area can no longer hold enough water during heavy prolonged rains what goes in must come out meaning amount of water still has to go somewhere hence will not stop flooding.
Down stream water velocity should be kept at a limit for safety and natural base structure, so maybe a rcc bypass channel from upstream water a few miles before the weir to downstream water will be needed to keep water speed at downstream
I'm guessing the zigzag weir lowers the upstream level by providing a longer line of interaction between the upper and lower water body than the straight weir. equivalent to widening the channel at the weir, but without the extra costs and land usage.
Только проход для рыб снизу нужно сделать - хороший. И поставить гидротурбины. И сделать проезд через плотину - всех видов транспорта. Тогда можно применять. Ну, и судам надо сделать проход какой то. Шлюзы или что там.
Nice concept. However, you didn't explain that the Labyrinth or zigzag spillway increases the length of the spillway so reduces the head increase clearly. . Also, what respectable engineer measures 200mm of flow with a 150mm ruler? This could be greatly improved very easily with a few changes. The basic information is here, it could be presented better though.
The video doesn't explain why the zigzag weir slows flow. It's easy, the non zigzag allows the full flow come down at once, leaving the full speed obtained from the fall in the lower level. While the zigzag increases the area of the fall line reducing the flow and forcing/redirecting it to go from a horizontal flow to a vertical flow, thus forcing the increased speed from the fall to dissipate vertically, literally making the water crash to the ground, thus removing that speed and mitigating the soil erosion problem.
The water height is higher at thr Weir because the water hits the weir and has nowhere to go but up. Same if you put a hose underwater and pointed it at the surface
Sir, I'm from India and I like your videos and my friends also like your videos many people in India watch your videos? But I don't understand that much English Can you add an audio track to your video and make it in Hindi voice also So that more people can watch and understand your video in India
![Jack Harlow - Hello Miss Johnson [Official Music Video]](http://i.ytimg.com/vi/Q86_nlRoIGw/mqdefault.jpg)
I hope you enjoyed the video on weirs. I would be truly grateful if you can support us on www.patreon.com/Lesics .Without your support our educational service won't be sustainable. Cheers Sabin Mathew
Sir, how was the zig-zag wier able to reduce the water level more than that in the planer version?
would u accept one time payment?
@@shyamtripathi2097 Hi, I didn't realise our audience would be so much interested to understand the physics behind the zig-zag weirs. I will definitely explain it in a dedicated video.
@@shyamtripathi2097 it is longer. Same as making river wider. Same as putting wider straight weir.
is this guy Indian?! I'm just curious, he has Indian accent
It's good explanation, but it feels a bit incomplete, because it doesn't explain why the zigzag weirs changes the heights of the stream relative to the straight weirs, given that with both the water falls from the same height.
Exactly, wanted to comment this as well
Increased surface area... Change of shape...
Sorry for skipping the physics part of zig-zag weir. I didn't expect this much curiosity around this topic. We will definitely explain it in a different video.
If you explain the physics the videos won't seem so geared to school children..
there is an increased surface area for the water to flow over.
This channel is awesome for integrating the authentic demonstrations with the english graphics. I have enjoyed seeing the real team show real physics models recently along with the narrator guy.
No replies wow 😲
At a guess, the Zig-zag increases the 'surface area' of the edge, making it act like the spill-over was significantly larger.
Perhaps you could include a safety warning because many weirs are unsafe. The unsafe ones create a recirculating hole below the weir that spans from bank to bank so that a caught swimmer can only get out by diving down to the fast moving water. Relatively safe weirs have eddies at both sides such that a caught swimmer or boat can swim left or right to get to either eddy and get out of the water. Of course, not everyone knows to swim to the side but it a least gives you a chance. I don't know if that sawtooth makes things better or worse. If a swimmer gets into the point of that tooth, will the water push them along the tooth and out or keep them securely trapped at that apex? (I assume the former but I don't know for sure.)
You didn't tell us how it works, so I'll tell you. Theres x number of cubic feet of water moving down the river It all has to go over the dam. If the dam was 20 ft wide, the water backs up because the dam is so narrow. The wiers zig zag shape, if you pull it out strait is like have a dam that 3, 4 or more times as wide. The liner feet of the dam is much longer. So it acts as if all of a sudden the dam is tremendously wide and the cubic feet of water needing to rush over is drops in height and slowly falls over the dam. Hope I explained that so you understand. The depth of the zig zag allows the cord length to be what-ever is needed to get the max flow to a manageable velocity going over the dam.
First time ever i felt a Lesics video gave partial explanation... You guys are amazing always. Please just explain the imoortnace of zigzag wier also.
And they wonder why their channel is failing. What about the zig-zag?!
But what about the erosion on the downstream side, it will increase right?
The increase of velocity on downstream can generate scouring on channel base, thus deepening the base of channel.
The video really demonstrated the concept of weir in a really simpler and easier manner, I really appreciate your efforts and hardwork, but we were also curious in knowing the physics behind zigzag weirs
Length of the weir is diffrent.
It is because of “volume”. If you take the total “length” of the area that water overflows and multiply by the height of the overflow then you have the volume available. The velocity is how fast the flow rate must pass through that volume. AKA… a larger drain pipe.
Using a zig-zag allows a longer “wall” within the width of the channel. Another alternative is to make a wider channel, but doing things like adding a curve/diagonal wall or waves/zigzags are more practical. The zigzag has other benefits when you consider the force of water applied to it.
It's also helpful to mention falling down a wier is extremely dangerous. One will get trapped in the current and be unable to escape. Therefore weirs are often called "drowning machines".
I drive past one of these a few times a month and always wondered why not build a damn? It took me 13 years to finally understand the purpose thanks to this video😅
Now im not saying the video is wrong but hear me out.
1. It didnt prevent upstream erosion. Erosion happen we just collected it against the weir. This becomes the longterm risk of these systems and in many cases they cant be removed without extreme risk.
2. Maybe Im just saying what was already said. By installing the weir you changed the shape of the rivers flow point from halfmoon to a flat line. The area available for the water to flow was reduced. Resulting in your high upstream height. The other has a longer surface area, allowing for more flow.
3. I find it interesting that you see this as slowing the velocity of the water upstream from the weir. Of course the overall flow rate of the river is going to slow down if your restrict it. The velocity of the water seems to be a result of the area provided for flow. I noticed you didnt mention that but instead had an observational equation to desribe the effect on the water but didnt describe the math that created the effect.
4. Why didnt we mention the erosion taking place down stream will cut a narrow channel now as a result of the faster flow rate but reduced area of flow?
i think those are very good points. i had similar questions, you answered most of them, thanks. also: wouldn't there be a lot of erosion at the downstream side of the weir directly at the weir due to all the turbulence in the water? thinking about it, i recognized my cities weir has additional openings at the bottom and valves with wich they can regulate how much water is flowing over AND under/through the weir at the same time. why exactly would they build it that complicated? has to have a lot of advantages, doesn't it? i thought maybe more constant flow rates and clearence of the collected sediment at the upstream side of the weir or less erosion in general but those are just guesses.
1. It did slow down the upstream erosion though since the flowrate is slower
@yotonking2831 it is possible it did. One issue you can see and they did touch on this is the video is that the upstream sides water table changes. It could be 0 do to a high sided river bank, but it could be catastrophic like we see when a lake is formed. It's highly dependent on soil types and the nature of the installation.
i think it decrease vertical erosion but lateral erosion increase on upstream side. And in downstream side vice-versa. also it depends on topography and geology of rock.
@yotonking2831 it may have. It depends on the topography and mineral density of the substrate. If it floods, you can see erosion in different areas. If it pools and doesn't flood, it changes the water tables so it could have unforseen effects.
The key thing I got from this is that the zigzag presents a much longer barrier over which the water flows thus reducing the increase in height for more flow. The narrator didn't explain that very well, but the diagrams did.
Thank you for creating great educational content for more than a decade.
This channel never gets old! I love your content dude
I hope this channel keeps providing us this great content also in the future.
The animation quality is really cool
Thanks!
You must also discuss the hydraulic jump that happens at the downstream side of the dam when the flow of water stabilizes.
Thanks Sabin Ji for your service
Pls have a little pateronage for your channel ❤
simple explanation to zig-zag for those who are wondering: discharge over weir directly increases as the effective length of weir increases the zig-zag path gives the weir a greater effective length for the same river width. and as the discharge from zig-zag length is more than straight length ... the water depth in upstream of river in zig-zag weir dont increase more than straight because it's greater length compensates the required cross section of area for the flow.??
Thanks!
Great piece of work there, it highlights the principle of energy conservation in a very intuitive visual way
Is it energy conservation? If the downstream river would be deep, the flow would be slow also, dispite the difference in potential energy.
@@paulfontaine7819 Interesting 🤔. My educated guess is that if the downstream river is deep, then there’s more mass of water so more inertia. Thus the kinetic energy of the water accumulated during the time of free fall (because of potential energy) will be lost to friction (so I guess heat?) with the bigger body of water downstream so the effects won’t be the same as when the water levels below are relatively low.
Erosion is controlled upstream due to the weir but erosion is accentuated due to higher velocity flow downstream!
So why does the zig zag work better???? Wow
@4:30
@@Eyes_of_Oryx Practical Engineering has a great video on Weirs. I am no expert, so bear with me on my terminology.
They don’t necessarily work better per se, as they’re both weirs. The zig zag pattern allows for more total linear length in the same area as a straight weir. More length means more area for water to flow.
The angle, material and shape of the weir will need to be fine tuned for desired flow and turbulence.
These things are so simple yet cool
The upstream head was reduced by the zig zag because there was more effective weir width for the water to flow over hence less resistance to the flow.
One thing's very strange about physics though- everything about it that seems so hard to understand becomes a piece of cake after knowing the answer
it's just a good explanation
Isnt everything like that😂
I am glad to know that :)
...you mean like literally anything?
Yeah, because that's so simple Europe has a strong push to build back thousands of weirs.
Weirs aggravate floods wakes arrive faster and more violently downstream. The small city upstream is fine while the large city further downstream where 2 large creeks combine totally gets flooded without any warning time.
The people just die in another legislature.
Weirs are also terrible for the aquatic ecosystem.
European Union removes weirs to increase drinoing water quakity and filtration. To redudce flood risk fron fast channled flows.
They reestabkish natural flooding zones and create artificial rapids for the same flood protection effect.
This concrete pouring promo tells youm like 10% of the complex truth.
As a white warer kayaker I can tell you how boring concrete channeled rivers are compared to natural flows. I'm by no means into biology or ecology, the difference in wildlife is staggering in a river having weirs vs one with natural water flow regulation.
There is very few places were such flood protection is essential and other means woukd not work. That's true for thunderstorm collecting basins or mountain zones where snowdrift piles up. Rare places that have frequent flash flood drainage events. Sites nobidy shouldnlive near the river anyways. Thanks to fertilizers and contraception we can start to move out of such dangerous areas. The need to pour them into concrete is basically gone.
The benefit of a species protecting aquatic and floodzone habitat offsetting agricultural monocultures as wildlife reserves is way higher in priorities today. We have to offset fertilizer use.
W/o natural habitats for bees and insects no food grows at all for humans.
China has taken this experiment far enough that people have to manually fertilize the pollen on every apple tree blossom with a q-tip in some regions where bees are extinct.
The most simple use of poured concrete is usually a terrible idea.
Go ask some real experts first before engaging in such projects.
It's not.that easy.
How is this channel not doing great when it has millions of views within a month?
Mr Sabin Matthews thick accent changes the words he speaks ( begining @ 0.39) so much, it turns his words into a different language altogether. This is not a good thing for an informative, educational, instruction video.
I did rewind it some because I enjoy and appreciate Gradys videos so much.
Thank you Grady for such fascinating videos.
Great work keep it going , Thanks
What is the difference between a weir and a dam? It seems like a new word for and old trick.
The difference between weir and dam:
Weir let water trough the crest, but dam forbid it.
On dam, Water flow through the penstock (or tunnel), mainly for power generator. The height of water on dam is regulated
Dam are use for collecting water to power generator or supply, weir are use for prevent surge of water to downstream. Both are reservoir just structure difference
Nice video. RUclips needs more this kind of educational content
6:10
Nothing beats this channel about explaining variable engineering theories so kindly but also true that there are so many fun points like this😂
What's wrong with your username😂
@@iaashu98 Corn is a metaphor of tooth in korea 😄
For global scaled, the retained soil either from weirs or dam will reduce the sediment source at estuary which may cause to the beach erossion
The graphic of flow area is incorrect on the upstream side. It is determined by the height of water and the effective length of flow over the weir, not the length of the channel upstream. This is why the zigzag pattern is more effective in resisting changes in upstream water level.
Thanks!
Surely there must be a point downstream at which the velocity of the water slows back down to what it originally was? Assuming no change in slope of the land of course.
Introducing a weir does not change the flow area. It increases the flow width and decreases the flow height so the area and volume of flow remains the same.
the increase of mass of the larger river upstream allows more percolation of water through the surrounding soil ...
There is one installed at Hope Mills Lake in Hope Mills, NC. It also has different heights within the Weir to regulate water flow.
Such a good explanation with animation and models
I really loved it
As im a student and not earning now but when i do i will surely support
Love from India ❤
I love the handheld mic. It looks like you're interviewing the experiment.
just wonderful! Thank you LESICS for such a nice video❤❤
I didn’t even know this was a thing! Incredible info
Thank you for the presentation!
Thank you man, i love these videos.
nice animation and narration. i hope you bring more because this is still incomplete.
Very interesting. Thanks for the upload
Great video 👋😄
So well explained, thank you!
I was here for how UFO works darn thumbnail artist
Great video but you forgot to mention the downsides of the weir, like how the river became unnavigable by ship and impassable by fish and other river animals. Also, the danger of a catastrophe if the weir is damaged.
Great...Bravoo
I was waiting for you to explain how the linear surface area is what reduces the flow. If X amount of water needs to cross a certain threshold, all you do is add more linear surface there by reducing the overall amount per area.
I'm by no means a mathematician. In fact, I am terrible at math. But I find it odd how this video doesn't ever mention surface area. Isn't that a major component as to why the zigzag pattern is so effective at altering the flow rate and height of the water?
So you start the video by asking a question, and then completely change the question....?
😂😂😅😅
Not sure what video you were watching….. 🤷🏼♂️
It is the basics of fluid dynamics... This is the logic behind the dams..... I didn't understand why there is lots of viewers are surprised about it.. I believe some where in your child hood we might have done this... Blocking flowing water and see that the height increases on one side of it
Man we got some "subject matter experts" in the comment section lol. Great video man. Thanks for teaching me somthing new.
What do you do with the sediment settlement over time?
Can you elaborate?
You CG it away
@@karantekwani3660 sediment/silt (fine particles of dirt and minerals) builds up in layer's seasonally.
Most modern weirs and dams have openings at the bottom and from time to time they get opened to flush out the settlement. There are impressive videos from China where you see a turd like stream of soil getting flushed out from a dam.
@@FritzSchober so that's what those videos are 😂
Civil engineering is an interesting field
The guy on coat is Malayalee 3:07
the z is not the only way to do this though. I've personally never seen it, here in Germany basically all the weirs I've seen instead opt to follow the falling curve of the water, so they are straight horizontally but curved vertically instead. It's kind of obvious why this works I guess, you have continuous flow all the way top to bottom without any disruption
This may work well but surely has it's limits.For instance if the upper stream area can no longer hold enough water during heavy prolonged rains what goes in must come out meaning amount of water still has to go somewhere hence will not stop flooding.
Down stream water velocity should be kept at a limit for safety and natural base structure, so maybe a rcc bypass channel from upstream water a few miles before the weir to downstream water will be needed to keep water speed at downstream
Canada beavers are laughing it up because nobody asked them about this secret.
🐾 Montréal 🇨🇦
loves from india ... please more videos on irrigation projects
Didn't understand the diff b/w zig-zag weir vs straight weir. The video was great as always👍👍❤
This video's view shows that most indian youth only sees reels and vulgar dance video 😢.
Amazing explaination
Thank you for the educational video!
The animation quality is really cool
Thanks for the Video!!!
Fantastic! Thank you!!
I'm guessing the zigzag weir lowers the upstream level by providing a longer line of interaction between the upper and lower water body than the straight weir. equivalent to widening the channel at the weir, but without the extra costs and land usage.
Nice vedio, thanks
This is also related to sri lankan ancient "weva" and "amuna" 😊
Good work Sabin Bro
Great video!
Awesome educational video as always!
Thanks
awesome video
Только проход для рыб снизу нужно сделать - хороший. И поставить гидротурбины. И сделать проезд через плотину - всех видов транспорта. Тогда можно применять.
Ну, и судам надо сделать проход какой то. Шлюзы или что там.
Please upload all possible videos related to OCF.
REALLY IMPRESSIVE EXPLANATION! ❤❤
Awesome video thank you!
Wonderful video
Nice concept.
However, you didn't explain that the Labyrinth or zigzag spillway increases the length of the spillway so reduces the head increase clearly. .
Also, what respectable engineer measures 200mm of flow with a 150mm ruler?
This could be greatly improved very easily with a few changes.
The basic information is here, it could be presented better though.
First to learn about weirs was in Practical Engineering youtube channel.
stunning knowledge about engineering Concepts
The video doesn't explain why the zigzag weir slows flow. It's easy, the non zigzag allows the full flow come down at once, leaving the full speed obtained from the fall in the lower level. While the zigzag increases the area of the fall line reducing the flow and forcing/redirecting it to go from a horizontal flow to a vertical flow, thus forcing the increased speed from the fall to dissipate vertically, literally making the water crash to the ground, thus removing that speed and mitigating the soil erosion problem.
WEIR is weird. Thanks for the video!
Although i never searched for this content, I find it very amusing. How WEIRd.
The water height is higher at thr Weir because the water hits the weir and has nowhere to go but up. Same if you put a hose underwater and pointed it at the surface
The soil deposited will it destruct the weir from working
Awesome
I have seen many beautiful weir constructions in Europe.
amazing video
I hope u keep the English subtitle cuz I learn too much from them😊
If a Water turbine could be attached/ installed it would also be a dependable source of power as well.
Sir, I'm from India and I like your videos and my friends also like your videos many people in India watch your videos? But I don't understand that much English Can you add an audio track to your video and make it in Hindi voice also So that more people can watch and understand your video in India
Hi I am from Bangladesh, I like your videos.
best as always