The Rainiest Place On Earth
Вставка
- Опубліковано 25 січ 2024
- How a rainfall simulator saves millions of lives. Get exclusive NordVPN deal here ➵ NordVPN.com/veritasium. It’s risk free with Nord’s 30 day money-back guarantee!
Special thanks to our Patreon supporters! Join this list to help us keep our videos free, forever:
ve42.co/PatreonDEB
If you’re looking for a molecular modeling kit, try Snatoms - a kit I invented where the atoms snap together magnetically - ve42.co/SnatomsV
▀▀▀
Huge thanks to Okouchi-San and Dr. Sakai and everyone at NIED and the Large Scale Rainfall Simulator for their time, expertise and access to this amazing facility.
A big thank you to Prof. Olga Mavrouli and Prof. Bill Schulz for their invaluable expertise on the mechanisms of landslides.
▀▀▀
References:
Ulbrich, C. W. (1983). Natural variations in the analytical form of the raindrop size distribution. Journal of climate and applied meteorology, 1764-1775. - ve42.co/Ulbrich83
Van Boxel, J. H. (1997, November). Numerical model for the fall speed of rain drops in a rain fall simulator. In Workshop on wind and water erosion (Vol. 5, pp. 77-85). - ve42.co/Boxel87
Canuti, P., Focardi, P., & Garzonio, C. (1985). Correlation between rainfall and landslides. Bulletin of Engineering Geology & the Environment, 32(1).
Tsaparas, I., Rahardjo, H., Toll, D. G., & Leong, E. C. (2002). Controlling parameters for rainfall-induced landslides. Computers and geotechnics, 29(1), 1-27. - ve42.co/Tsaparas2002
Nakamura, H., & Oosawa, M. (2021, March). Effects of the underground discharge channel/reservoir for small urban rivers in the Tokyo area. In IOP Conference Series: Earth and Environmental Science (Vol. 703, No. 1, p. 012029). IOP Publishing. - ve42.co/Nakamura21
Guthrie, R. H., & Evans, S. G. (2004). Magnitude and frequency of landslides triggered by a storm event, Loughborough Inlet, British Columbia. Natural Hazards and Earth System Sciences, 4(3), 475-483. - ve42.co/Guthrie2004
Images & Video:
Miyako, Iwate Tsunami via ANNnewsCH - ve42.co/Miyako2011
Mount Onake Volcano via BBC News - ve42.co/BBCOnake
Typhoon Jebi via Al Jazeera - ve42.co/TyphoonJebi
East Asia Typhoons via CBC News - ve42.co/TyphoonCBC
Atami Landslide via The Quint - ve42.co/Atami2021
Atami Landslide via news.com.au - ve42.co/2ndAtami2021
Sendai Earthquake via ANNnewsCH - ve42.co/SendaiQuake
Nagasaki Mudslide via The Telegrap - ve42.co/NagasakiMudslide
Wajima Landslide via Guardian News - ve42.co/WajimaLandslide
Drone Rainfall Test via AIZAWAchan - ve42.co/DroneRain
Car Rainfall Test via TIER IV - ve42.co/CarRainTest
Rainfall Simulator via NIED - ve42.co/RainfallSim1
External Footage of Simulator via NIED - ve42.co/RainfallSim2
Landslide Simulations via NIED - ve42.co/RainfallSim3
Typhoon Prapiroon via Force Thirteen - ve42.co/TyphoonPrapiroon
Yanohigashi Floods via CNA - ve42.co/YanohigashiFloods
Japan Floods via The Telegraph - ve42.co/TelegraphFlood
Japan Floods via euronew - ve42.co/EuroNewsFlood
Typhoon Hagibis via Guardian News - ve42.co/TyphoonHagibis
Typhoon Hagibis via SCMP - ve42.co/TyphoonHagibisSCMP
Satellite Imagery of Hagibis via Force Thirteen - ve42.co/HagibisSatellite
Tokyo Flood Control System via NikkeiAsia.com - ve42.co/FloodControl
Landslides Footage via Underworld - ve42.co/MonsterLandslides
Norway Landslide via ABC7 - ve42.co/NorwayLandslide
Planet Destruction via BBC - ve42.co/BBCDestruction
B.C. Climate Change Danger via CBC News - ve42.co/BCClimateChange
Canada’s Logging Roads via CBC News - ve42.co/CBCLogging
▀▀▀
Special thanks to our Patreon supporters:
Chris Harper, Max Paladino, Balkrishna Heroor, Adam Foreman, Orlando Bassotto, Tj Steyn, meg noah, KeyWestr, TTST, John H. Austin, Jr., john kiehl, Anton Ragin, Diffbot, Gnare, Dave Kircher, Burt Humburg, Blake Byers, Evgeny Skvortsov, Meekay, Bill Linder, Paul Peijzel, Josh Hibschman, Juan Benet, David Johnston, Ubiquity Ventures, Richard Sundvall, Lee Redden, Stephen Wilcox, Marinus Kuivenhoven, Michael Krugman, Sam Lutfi
▀▀▀
Directed by Petr Lebedev
Written by Petr Lebedev
Edited by Peter Nelson
Additional Research by Gregor Čavlović
Animated by Fabio Albertelli
Illustrations by Jakub Misiek
Filmed by Petr Lebedev, Emily Zhang, Derek Muller
Produced by Petr Lebedev, Han Evans and Gregor Čavlović
Thumbnail by Peter Sheppard
Additional video/photos supplied by Getty Images
Music from Epidemic Sound
![[실시간] 전철에서 찍힌 기생생물 감염 장면 | 기생수: 더 그레이](http://i.ytimg.com/vi/4nkFvwxGAfA/mqdefault.jpg)
The cut from "trees are incredibly effective at preventing landslides" to the saw and deforestation was 10/10. Great editing!
It was such a smart move. It isn't beating you over the head with "plant more trees cause tree good" it showed you the science behind a topic and then showed how those principles are being ignored for others gain
Yeah, it was heartbreaking to see. Sends a far more powerful message than saying it repeatedly.
I'm ngl I giggled, it was pretty cheesy
but in the end the conclusion was landslides come from the use of fossil fuels, what a sham
@@Repent-and-believe-in-Jesus k
The fact the entire warehouse can move and reconnect to a its water supply is incredible.
If you want incredible, then look up how they move spacecraft to the launch pad at Cape Canaveral.
yeah like 2m/h is really incredible...@@Shinkajo
There's houses like this.
@@Jayess-cnot just houses. Whole commercial buildings were moved at some point at least in US and China
@@rinkashikachi I thought they meant just like rotate it. There's a house that rotates and constantly disconnects and reconnects itself to its pipes
The most insane thing from this that I learned was that Tokyo has a massive underground network for flooding. It looks so colossal, I can't imagine how eerie it must feel to be down there.
Also for someone who clearly doesn't speak English a lot, that Japanese man did a great job. Most Japanese people don't attempt to pronounce "L" as they don't use it in Japanese, but he did and I appreciate it.
If goblins start pouring down from the ceilings don't say I didn't warn you
I believe Tom Scott has a video on this entitled "These tunnels stop part of Tokyo flooding"
I believe they offer guided tours of the underground tunnel system during the dry seasons
backrooms level japan.
@@wontbefamous2342 That would be incredible to check out. I'm gonna look for more videos on this for sure.
The footage of all those houses being destroyed in seconds is so scary. The screams from that man gave me chills.
That was wild. I've seen some flooding videos, but it was mostly water and some cars, but to see whole houses being moved like a paper boat in a river is another level. I can imagine losing everything like that 🤯
Watch "Himachal pradesh india flood and landslide last year" you'll be shocked😢
You should know that it's by design. Easy and cheap to build new houses, only to be ruined by a new storm later on
@@bobby4tw these things happen because of deforestation. The trees roots normally hold the ground together.
Mythbusters needed this place when testing walking vs running in the rain :D
My thoughts exactly 😂
important moment in human history
Minute physics did a great short video on that topic. Worth a watch
Well, I mean since it's pretty simple math not rly, but would be fun content tho!
I always wondered why they didn't run that test in a circle, than they could have more control over how long their dumby "ran" , could have more control over speed and time.
In Denmark we're currently experiencing the results of a man made earth slide, where tons of toxic earth started shifting after heavy rains. Threatening to bury the town of Ølst under 5 meters of earth. The reason? A company was permitted to build a mountain of contaminated earth on top of a special type of clay that becomes slippery like soap when wet. (Not sure if it's the same as "quick clay") - But a country with no mountains having a legitimate and dangerous earth slide is wild.
Capitalism goes brrr
Shifting where? Was it the tallest garbage pile in the whole country?
I'm from Denmark and I'm glad I left lol. Theyve made it extremely difficult for people of color to move there. Theyre extremely racist
Brazil had something similar some years ago, a company built a dam to storage mining waste and it broke due to the lack of maintenance, leading to a landslide of toxic mud that destroyed a city and contaminated a whole river with heavy metals.
How true: When a Dane talks about a company being permitted to "build a mountain" of something, he really means business, relatively, in a country where the highest "mountain" is less that 150m high! Capitalism has to be taken with a grain of salt and strictly monitored - which was not the case with the Danish man-made "mountains", with predictable results.
Holt was the most precipitation recorded in 1 hour (305mm - 12in), but the most violent ever recorded occurred in 1970 in Guadeloupe, France. 38mm - 1.5in of precipitation were recorded in 1 minute. That's a 2280mm/h or 90in/h pace.
man thats like swimming underwater
Bro sounds like God was trying to waterboard them for some reason what was happening in France in the 70s
@@cralix2782 what happened to france in the 70s?? and why would god do that??
*cough* *cough* *ignore the flood cause there is no actual evidence beyond bible for that *cough*
@@cralix2782 Gay sex
This is truly a marvel of modern science. The work being done at this Japanese facility is indispensable for disaster management and research. It's fascinating how much we can learn from simulating extreme weather conditions. Kudos to the dedicated scientists working tirelessly to keep people safe.
When we moved to Japan we recieved this nice pamphlet from the city, listing all the potential natural disasters (eartquake, tsunami, heavy rain, tyfoons, landslide, flooding, and fire) and what to do in case they happened. Including a list of all emergency supplies you were expected to have for your household, easily accessible in a rucksacks ready for a fast evacuation at any moment. Not sure wether to be terrified or reassured!😅
Definitely reassured, if its japan, then the safety precautions are not lacking in any means
Definitely be terrified. All that preparation can only minimize, not prevent, loss of life and property. Look at the recent Noto earthquake, for example. Japan leads the world in earthquake preparedness, but there were still hundreds of deaths, and thousands left homeless after the earthquake.
@@stevenqirkle Resilience is more important than prevention. Asking a total protection from disasters and bad lucks are a religion, not a science. Science is how human has progressed this far against all the odds, and is how Japan is led and going the right direction. By science.
I'm not sure where you were from, but I can tell you here in the US there's none of that unless you've got a friendly neighbor. I moved from California where rolling brown-outs were a common thing in summer (high dry heat and too much AC usage) and unless you grew up there you wouldn't know to have plenty of water and sun screen available to Pennsylvania where we'd get occasional crazy summer thunderstorms, not to mention learning to be prepared for snow and ice on the roads. If it weren't for family I'd have known none of it, so I'd say it would be really reassuring to get something from the city/state saying "Hey, be prepared with these minimums just in case"
@@jnfunvufb who’s asking for total protection? I’m just saying the dangers from natural disasters in Japan are real. Magnitude 7.5 earthquake in 2024 in Noto, 6.6M in Hokkaido in 2018, 7.0M in Kumamoto in 2016, and of course the 9.1M Tohoku earthquake in 2011 that killed 20,000 people that the country still hasn’t fully recovered from.
And there was the 2019 Typhoon that did $17B in damage and killed 118. Or the 2018 floods that killed 225 and did $10B.
And these are just recent events. The fact is, if you live in Japan long enough, you will experience a devastating natural disaster. The original post was asking if they should be terrified or reassured. I think it’s commendable how well Japan prepares for and responds to disasters - better than anyone else in the world. But there is a good reason they take them so seriously. And anyone living in Japan should have a healthy amount of fear and respect for earthquakes, typhoons, winter storms, volcanoes, landslides, etc.
I spent a week in Yakushima several years ago and remember being surprised at how much it rained there. It rained even more than in my hometown which is prone to hurricanes. Now it makes sense why.
a) its fake and you switched the story mid writing
b)youre just bad at wrting in english
@@ydrib6086 if you are responding to me, your comment makes no sense
@@ydrib6086 ???
"i spent a week in yakushima several years"
did you spend a week of several years you liar🧢@@macroxela
read the god damn comment you shuman🐑
he said "I spent a week in Yakushima several years"
a common trait for a lie-switching the plot of it mid-story@@k4vinzen
Being from the UK rain was never more than a mild inconvenience for me until one day which started nice and sunny, my girlfriend and i were in a park having a picnic when all of a sudden the weather turned and immediately began a downpour unlike i've ever seen, the rain was so heavy and cold that we could barely breathe and we were now on a completely waterlogged field with lightning striking around us. The rain was also so heavy that we could not see 20ft in front of us so we lost track of where we were going and ended up far off track from the building we were heading towards for safety. It was terrifying, ever since then i have never underestimated how dangerous rain can really be when it gets heavy.
Harrowing story friend. Have had a similar thing happen while driving. Everyone had to stop, pull over and simply let it pass. It was cool to see without any direct communication with each other, everyone just stop what they were doing because doing anything would be too dangerous.
This is every afternoon in tropical cities!
Use metric, don't be silly.
@@Shijaru64Just be bilingual with your measurements. It is easy to learn both.
Bro like 95 percent of people use metric @@andrewbstevens
The most rainfall ever recorded within one hour was actually 402mm which occured on the 3rd of July 1975 at Shangdi, Nei Monggol, China.
The 305mm record at Holt occured over the course of 42minutes (equivalent to a 435mm/hr intensity).
However, the most intense rainfall recorded occurred in 1970 at Barot, Guadeloupe where 38mm was recorded within a 1-minute duration (equivalent to 2280mm/hr intensity).
While reading what you wrote, I remembered a rain I once experienced, in Bulgaria (I used to live there for a few years, a few decades ago). It only lasted like 3-4 minutes, but it was so incredibly intense, that while driving on a local highway, I had to literally stop in the middle of the road, because my wipers (on highest setting) couldn't cope at all, making visibility in front of the car literally none. A dead stop, in the middle of a highway, where just minutes ago, cars where travelling at 120+ km/h. I bet they all stopped and just sat there, just like I did. The sound of the water hitting my car was almost deafening, loudest I've ever heard. I mean that was just an absolute mayhem. No idea what mm/h that was though.
All of which are higher than the 300mm/h that this facility can do, so it can't "simulate the most intense rain recorded".
I have seen Rainfall here in the tropics that would easily beat one meter per hour, but it's usually a couple minutes worth, which still floods places. Damn does it hurt as well.
China dates are not reliable.
@@BenPyman I think it was most intense rain in japan, any rain that the simulator simulated in japan thats very intense?
2:35 to 2:40 is the best show of the amount of rainfall here. You can see a hole in the water at his feet from the umbrella. Never seen anything like that before and it looks crazy.
My respect for Japan has increased 1000 folds the way their scientists and government are trying to save their citizens 🙇♂️ This video and the earthquake one prove the effort they put into saving lives of their citizens. ❤
now the amount that i want to go there has decreased by 1000 folds.
@@emilymayer5926 go away, Nazi
Opposite for me @@Veasirae
@@emilymayer5926anti immigration goober try not to bringup their wrong bigoted ideas challenge (impossible)
Unit 731
Cyber homelessness
Nanking
Colonization
don’t forget all the kaiju attacks they experience
They probably have a facility to simulate that
Originally, the rainiest place on Earth is Maysynram, India. Located in Meghalaya's East Khasi Hills district, Mawsynram is celebrated as the wettest place on Earth, receiving so much rain that its average annual rainfall reaches a staggering 11,871 millimeters.
As an Indian, I can assure you that the place is really beautiful. It's worth unraveling, it's beyond just rain.
Yes
That's what I'm also thinking, the title of this video is a bit misleading.
It recieves most rainfall. But not the highest rainfall received in a short time
SLIPPERY VS FRICTION
The soil particles aren't more slippery, they just aren't being pushed together as hard. It's like applying an upward force to a couch in order to make it slide more easily, the floor and couch aren't more slippery, but there is less friction.
thank you for this, i was slightly confused by the explanation provided in the video. i'm also figuring that someone could make a model of this phenomenon by making sand castles.
Isn’t that just slightly higher scale definition of friction?
@@maxp3141 Yes. I find it easier to understand using an example that is more relatable to humans on the macroscopic scale.
There is less friction, but none of the parts have become more slippery.
@@durdleduc8520 You're welcome. I didn't understand it at first either, but I figured I must be missing something, so I went searching for the answer.
I feel like your explanation still runs into the same issue. "slide more easily" means it is "more slippery"
This facility makes every kind of rain there is. Little bit of stinging rain, big ol fat rain, rain that comes in sideways, and even rain that seems to come straight up from underneath.
Forest gump
Imagine need to simulate rain instead of experiencing one. So sad
(Before some idiots thought im serious. Im not)
Nice one
Glad I wasn't the only one to think of Forrest walking chest-deep in water during Vietnam
12:40 WOW!!! BEAUTIFUL TIME LAPSE. I like how you showed that a natural and gradual change like the bends in a river weren't even forming in comparison to how quickly the forests got leveled and developed upon.
Great to see this channel flourish!
Welcome back to Australia, Derek!
As someone who grew up in Watsons Bay, I immediately recognised where this shot ( 2:04 )was made from 😊.
This video goes great with Practical Engineering video "Do Droughts make Floods Worse" where he goes into how soil absorption affects flooding.
Typhoons aren't _like_ hurricanes. They _are_ hurricanes, because the only difference between hurricanes and typhoons is geography: if a tropical cyclone of sufficient strength is north of the equator and over the Atlantic, it's a hurricane, if it's north of the equator over the Pacific (there are specific longitudes involved) it's a typhoon, and if it's south of the equator it's a tropical cyclone. That's literally the only distinction.
Right. All hurricanes and typhoons are tropical cyclones. 'Hurricane' and 'typhoon' are just labels we decided - arbitrarily, as far as I can tell - to give to strong tropical cyclones that occur in particular parts of the world.
@@JonMartinYXD It's all cultural. Hundreds of years ago, before meeting, the Europeans said 'hurricane' while the Japanese said 'typhoon'. Then the scientists looked at all of them and said 'tropical cyclone'.
@@jursamaj Not many hurricanes in Europe. The name originated in the Caribbean. Spanish explorers brought it back to Europe.
They are all the same thing, but they do spin counter rotating in opposite hemispheres, which is proof of a spinning globe, flat earthers generally don't have an excuse for.
@@nethiuz9165 False: flat earthers have an excuse for _everything._ Nonsensical excuses, but excuses nonetheless.
Great to see this channel flourish!
Welcome back to Australia, Derek!
As someone who grew up in Watsons Bay, I immediately recognised where this shot ( 2:04 )was made from .
The landslide footage shown was insane. I had to rewind and rewatch those clips a few times to even wrap my brain around what was happening. Especially the one where an entire house just.. falls off the cliff.
10:28 "Water doesn't make soil slipperier" ..."but water decreases the friction causing a slide"
What now? For me "decreasing friction" is the definition for making something more slippery.
slippery has a different definition in Geology. Geoligists are very technical in definitions
think of sand castles, u need damp sands. The context of slippery here refers to the built up of pore water pressure.
@@peepeetrain8755 it would have been a good idea to define those terms then... otherwise the confusion is inevitable...
Maybe this example will help, if I have a super grippy tire and I want to reduce friction I can either:
1) Swap to a harder compound (less "grippy") tire which will reduce friction, without lubrication
2) Keep the same tire but add oil to lubricate, here I have reduced friction again but this time with lubrication
What they meant is that water doesn't lubricate the grains in the soil allowing it to slip. Water changes the state of the soil, from liquid to plastic to semi-solid and solid.
Water "invades" the pores between grains, putting pressure on those grains from all directions. There are coarse grained soils like sand and gravel and fine grained soils like clay and silt. The latter trap water because their porosity is low, meaning the gaps between grains are smaller. When that happens, water can't escape and as previously mentioned applies pressure on the soil grains. That makes the soil a) heavier and b) as previously mentioned increases the pressure applied on the grains inside the pores. a) and b) decrease a characteristic of the soil called "shear strength" which is basically a factor determining how easy it fails.
All that means that enough water and you get a soil that was previously solid suddenly behaving like a liquid.
10:15 That scientist's statement about the "myth" of water making the ground slipperier sounds like semantics as the following explanation details how water decreases the friction of the minerals that in turn leads to the landslide.
Haha, interesting point.
Friction is the resultant force
Slipperiness is about the coefficient of friction
Friction force is the pressure force times the coefficient. So it is not the coefficient that decreases but the force exerted that is reduced due to the water applying an opposing pressure force.
Edit: not my own insight. Someone a few comments below said this and i think he is right
It makes it slip easier...which means it makes it slipperier in my opinion. I'm sure the stuff with the coefficient of friction is true but I'd say the water makes it slipperier.
The water makes it so that there is less friction FORCE. The minerals don't get slippier, as in that the coeff. of friction does not decrease.
(I just said what @outandabout259 said in another comment)
@@jasperdecraene6239 the minerals slip past each other more easily. If that doesn’t make it slipperier than what does the word “slippery” even mean?
Came too see someone experiencing rain indoors. left learning about landslides, typhoons, and heavy rain
I've never been in a hurricane, but the monsoon rains in Eastern Arizona are the most intense, and painful rain I've ever been in. The raindrops felt like marbles hitting you. It only took a couple minutes to be flooding our town.
That guy running out into the rain simulator looked just like the rain in Eastern Arizona.
If I had a nickel for every time Veritasium made a video about a large scale indoor natural disaster simulator in Japan, I would have two nickels, which isn't a lot but it's weird that it happened twice
(edit: for some reason I forgot part of the meme lol)
…and a lot of counterfeit Apache helicopters 🤣🌈🤣
Always upvote Phineas and Ferb
i don’t want to be that guy, but you definitely forgot a line there
You had one task and failed it
oh hi katakana
That was pretty cool, I'm glad Japan is serious about managing their natural risks. The whole landslide and flood thing was the topic of an exam of mine back in university (I topped the class on this one). Indeed, vegetation is the primary and simplest and cheapest way to keep a slope stable. Level a forest on a slope right above a town that a river is crossing but channeled by concrete, put buildings all over the original bed of the river, IN A PLACE WHERE IT REGULARLY RAINS LIKE CRAZY after dry summers....... and you get people in big trouble almost each fall.
the work these gentleman do is saving millions of lives annually, thank you for shedding light on this type of work
6:15 I live 15km away from that place, in Alta, Norway!
I remember it being on the news everywhere, and it was a big devestation for us all
We had another massive quick clay incident a couple years back too where a lot of people were killed. In Gjerdrum. Not sure if it qualified as landslide though
And look at all those trees! It's pretty clear that the slide happened pretty deep in the soil.
@@kdm_entertainment jeg husker det også! Var ikke det rett på nyåret? Var på nyhetene over alt, og hele Norge fulgte med på hva som skjedde
wr
@@kkarlsen_06 30. Desember 2020 faktisk!
8:06 to skip the sponsored segment
I have never been more captivated by a channel I never knew existed. I love this content. Reminds me of SmarterEveryDay. Fantastic videos! Great information. Very well done!
this is stuff you never think about but there still is and its cool as hell
This topic fits perfectly to the other recent videos where the team visited the earthquake testing area... Nice!
I think the word , trigger, you where looking for was influence... great show as always!! Thanks guys.... 😊 ❤❤
I studied a little about rain and landslide in Environmental Science course in my BBA study more than a decade ago. Good to see it again in this video. This keeps reminding me the importance of preserving the natural environment and the damage we have done to our home planet.
26th July 2005 rains of Mumbai is something I can never Forget.. where it rained more than 900mm in 24 hrs..😢
*Really* intense rainfall never lasts anywhere near an hour. When it's really coming down hard, it's like standing under a waterfall (MUCH heavier than anything shown in this video; under those conditions, you wouldn't be able to see a man standing as far away, as he was from the camera), but it never keeps that up for more than a couple of minutes at most. 30 seconds is more typical. But in that 30-120 seconds, you can get several inches of rain. I've seen this happen three or four times in my life.
It does in some places
Quality title.
Way more interesting than if you were actually just talking about the location that gets the most rain. Walking the line between clickbait (for clicks) and honest title (for transparency) is tricky, but you really nail it.
It’s been a long time since I’ve seen anything that has completely stopped my brain to the degree the landslide footage in this video did. That just entirely changed my understanding and context of what a landslide can mean/do. That’s astonishing, in the most literal sense
I want to share a thing about rainfall that I learned some time ago which was quite surprising.
When I was younger and hearing about rainfall, I tended to hear two measurements: milimeters and litres per square meter. I always considered the latter to make more sense for me and I didn't put much more thought to it. Then, one day I thought to simplify the units of l/(m^2) to see what I get. A litre is a decimeter cubed which is 1/1000 of a cube meter. This gives us 1/1000 * m^3/m^2. The result is 1/1000 of a meter, which... is a milimeter! Surprise!
This will blow your mind:
The meaning of 1 mm water is, that if you put a container with straight walls into the rain, it will fill with a height of 1mm no matter how big it is. The bigger it is, the more water will fall into it,but also its area is bigger,and thus after all the rise in water level is the same.
And if you have a square meter sized container, filled to 1mm height,it will contain 1l of water.
So the units are literally the same
@@neutronenstern. This only works if the heights of each wall on the container are equal and/or the rain is falling straight down.
@@LeTtRrZ That is exactly how both the definition works and how meters work.
It's the same weird realization that fuel efficiency is measured by area when simplified. Which makes sense if you think about it.
@@person8064 That's true for metric. In US measurements it's inverted area, which doesn't make sense if you think about it.
Good to see veritasium swooping in to fill the niche left by Tom scott
You’re the FREAKING GOAT for putting that little wheel on your built in sponsor for your video I always skip these and I always go to far or not far enough. That was perfect! Hahaha
Love the Japan-series! There are alot of influencers exploring Japan right now, but you are exploring engineering and science topics and I apreciate that
Cherapunji, in the far North East of India, receives an annual rainfall of 11.77 meters.
This
Tutunendo in Colombia its pretty close, 11,77 m annual rainfall too
@@felipesernatoro9244 That's great to know.
I thought the video was about that too lol
@@Infiniti.151 Veritasium has been making mistakes with videos twice now. Once with the Rods from Gods, now this.
Ive been to Tsukuba before. They do a lot of experimental research and it’s quite impressive. The natto there is awesome.
Great to see you visiting Australia, hope you have a great time i our backyard. Also the producer that stood in for you was great
The indoor rainfall simulator is so fascinating! I love seeing these innovative ways of studying and understanding natural phenomena.
10:57 So water doesn't make it slipperier, it just makes it slipperier. 🤨
May be easier to think of it as turning the ground from fairly solid into a wet slush.
Dose holding a rubber above a piece of paper and moveing it makes the rubber slipperier? The water making distance between the soil grains not making the surface slipperier.
Japan never cease to impress me. So many natural disasters and yet they're still doing so well. I can't imagine if these events happens in Europe, the continent will be wiped out, we do not have their skills to endure these natural events.
I think you greatly underestimate the amount of world class engineers in Europe. The EU has loads of environmental prevention systems, just look at the Netherlands.
But for the French. They would surrender. @@dengar96
@@systemsbroken france is an african problem
That's where this particular Japanese saying/worldview comes from, try searching "Use and Meaning of Shouganai(しょうがない) in Japanese"
Speak for yourself, dmbass.
If I was a billionaire I would have one of these for my shower
The hardest rainfall I've ever seen was in Denver Colorado in 1998. One of our workers came in to work absolutely soaking wet. Like just stepped out of the shower soaking wet. I asked if she couldn't get dropped off by our front door that was only +- 15 feet from the dropoff area and she said she had. I opened the front door and was shocked to see an almost solid looking wall of water with visibility of less than 50 ft but almost no wind!! I had to quickly shut the door as the water instantly started coming in. It only lasted about 10 minutes but we had over a foot of water in a well drained parkung lot!! I still shake my head whenever I think of it! The biggest raindrops... Miami Florida, Sept/Oct of 1976. 1 raindrop would spread across 30% + of my dad's front windshield. Good thing it was barely coming down, which is why I could see how big the drops were due to the very low clouds. Thanks for reading my memories.
This explains how movies have it rain everytime someone dies and there is a funeral.
1 minute
And how American films always contrive rain in London, even though London has relatively low rainfall.
All Vertasium videos have been absolute bangers recently. For the past 6 months each and every video has been added into my personal reserarch-notes-for-worldbuilding playlists. They educate us on so much about the world and about people
What do you mean exactly? Are you collecting references for a story?
The segue from landslides to Nord VPN was pure gold.
Considering all the topics you’ve covered and the effort put into your vids I was really surprised to see you haven’t uploaded any content about the VR industry, I’m guessing you have already but have you ever tried a headset before? some really exciting developments with ODT’s as well, the Katwalk-C looks a bit strange but the folks over at Infinadeck definitely have the right idea, Destins vid on this a couple years back is really well put together I’d recommend it if you haven’t seen it before, hope you see your thoughts on this some day.
That is a marvellous piece of engineering. I'd be interested in seeing how the pumps works or how the water is recovered after the tests
+
the pumps work by generating pressure. Basically pushing water forward in the pipe.
The water is recovered through drainage in the floor.
case closed
@jonaswox you cannot have your run of the mill pump for what is shown in the video. And probably not only one given the uniformity of the rain throughout the warehouse
Talk about perfectly timed. It’s been shitting downwards with rain where I am right now for 3 days now.
3 days? That's
nothing.
Switching to the producer really made this feel like a discovery channel show
I live in Tsukuba and did not even know that we have this massive rainfall simulator. glad to watch this video. one learning a day
12:21 truely a surprised pikachu moment
This video is the exact representation of why I love watching Veritasium, They show us what we as humans have done, what we are doing & what should be do to prevent worst outcomes. The technical, physical & other aspects really binds it together. The main things humans should do is to plant more trees & reduce our wastage. I think all other problems can be sorted out if we can complete this one.
so, basically afforestation.
The rain doesn’t make the ground slippery, it just decreases the friction between grains. Soooo it makes it slippery?
This reminds me of an episode in Phineas and Ferb when they became unlucky, they tried to calculate every unlucky situation that could happen and give a solution, Japan is really doing the same thing to fight against their unfortunate, which makes me so respect them
This is just the video game rainworld
As a child I promptly remember experiencing a rate of rain that was impossible to see through with even the wiper blades on full speed. I remember it as if the windshield was an ocean with waves and if that’s not the worst amount of rain I couldn’t imagine what they experienced
I was thinking the same thing. Couldn't hardly see my bumper, very sketchy 5mph drive.
They may have brighter lights on the other side to help see through it
@@kevinbecker5440 yeah I was really young like probably 2 or 3 but my mom definitely had to stop driving but I didn’t really understand what was happening but it left a
memorial impact on me that I remember over 20 years later , I remember the rain and couldn’t imagine what someone who has experienced worse went through
I don't think this rain warehouse can match the intensity of nature. It's only when averaged over an hour that it claims that prize I think. Nature can be much more intense in short bursts like a minute or two. I've also experienced the unbelievably intense downpour that brings traffic to a standstill because nobody can see the road in front of them.
Love your channel, learnt so much from it.
And Go Canucks Go! 😄
We love this! We appreciate the feature of our amazing wind tunnel technology and the STEM that goes into indoor skydiving! We have a passion for teaching students the physics of flight and we’re so glad we could help make learning more fun, the way you do! ❤
In 2018, A state in India named Kerala, experienced a greatest flood, due to the amount of rain and the sudden opening of the dams. Also, since some of the places were surrounded by mountains, landslides of greater intensity happened, causing the loss of countless lives. If, a facility like this is built here to study the rainfall disasters and prevent it in the future, it will be a huge benefit for the people living in Kerala.
Those videos of the landslides are absolutely terrifying
Absolutely mindsliding.
Great video! I am a Geography teacher and will for sure use this in my upcoming lesson series on hazards. One tiny bit of feedback which am sure other people pointed out as well, showing footage of the
2011 Tōhoku tsunami at 14:12 when mentioning an increase in human-induced extreme weather events might be a bit misleading. That said, great video again!
I was looking for a comment on this. Here, have a like 🙂
With Veritasium being a science channel, accuracy is important. Nothing wrong in the video in general, but it is indeed misleading to show the 2011 tsunami footage when discussing climate related topics.
Haha, thanks, @@kongrufus1. I will give you a like as well.
There is always something to learn from your channel.
I really appreciate how you used all SI units. I was born and bred in USA, but I use mostly SI units. I quote most measurements in SI, and translate if they ask. We don't need a government edict, if more people use SI, the others will get it eventually. I might be slow on temperature, but I am enjoying a nice 10 C.
As a Japanese from where it’s literally illegal to use units other than SI, I can’t imagine converting units back and forth. That’s wasting so much brain resources unnecessarily. I wish the human race stick to the SI system once and for all.
Glad my country was one of the first to adopt the SI.
i mean i can use both. most Americans can, we just dont realize it.
2:00 Correction: anyone has ever recorded.
I appreciate the ad transparency
Amagaon is a village in Belagavi district bordered by Goa in west in the southern state of Karnataka, India. Amagaon nestles in the dense forests of the Western Ghats in and is known for its heavy rainfall. It is known to get over 10,000 mm annual rainfall occasionally and the average annual rainfall is around 9,000 mm. It is also called as Cherrapunji of South India.
Am I the only one who loves rain more than any other weather? Just puts me in a great mood when it rains. The old Garbage song certainly holds true for me.
So many people say this but man, rain just sucks so much. Like the only reason for liking it is if you're just inside all day
@@ActualHumanBeing Sunny ass california? Dude I live in sweden where half the year is snow, darkness and slush. I really do treasure the few months of sunshine we get
4:32 that subway entrance was in suzume, great movie ! Really interesting video i'm binge watchin em right now
Only Derek could make a clip-show hacked together while he's off sunning it up in Australia, and have it turn out absolutely rivetting!
I always thought that the wet soil is much heavier than dry, hence the gravity pull is stronger, so at a tipping point it overcomes the friction and starts a landslide.
Maybe a combination of both?
I think that probably contributes too.
Don't know how that well this applies here, but friction is calculated with the normal force, aswell as the friction coefficient. As the increading weight linearly increases the normal force and the force trying to start the landslide, it shouldn't affect things too much. (that assumes that every part of the slope is the same angle. But obviusly if you have a part of the slope that only holds because of the flatter slope above and below it, adding more weight will make it more likely to slide.
Ok, so I (over?)thought about it and I think what Derek & co were trying to say is that we falsely assume that when water falls on quartz, probably iron, and other particles that make up dirt, they become one. What actually happens is that it just fills in space between those particles. 'Absorb' is not what we intuitively think it is, to put it another way. The mass of water might cause an effect due to gravity, but it's much less than the loss of friction.
@@NoahBuehler I think you're right. I forgot that the force of friction is directly proportional to the normal force. I think the reason why I and OP ignored that is because the ground is at a slope, so the normal force vector would be at an angle, while the gravitational force vector is straight down. I'm too lazy to do any calculations though
The logic at 10:45 does not settle with me right. The fact that the pores pressure is increasing due to the presence of water is making it sound like the pore is expanding pushing the sediment all around it.
Instead I believe this phenomena to be caused by 3 primary motives:
1. The water adds weight on to the dry soil below it.
2. The buoyant force is essentially making all the sediment have a lower weight (which a. removes some normal force lessening the frictional force vertically and b. lessens the effect of gravity wanting to level it out)
3. Since rain is fairly pure; I also wonder how on a larger scale the effects of the water dissolving the sediments comes in to play (shrinking/dissolving sediment geometry is like pulling out more jenga pieces, and water generally becomes more dense as it dissolves more dense material ie salt water)
Very nice.
Please send this to various government through social media.
So this video just got recommended to me and the algorithm is scary, not only am I currently under an evac alert for possible flooding, but i live in Pemberton where the landslides over the road photos are taken at 12:32
10:49 Water doesn't make the soil more slippery, but decreases friction between the [soil] grains.
So, by definition it makes the soil more slippery.
It makes the soil act as if it were more slippery and, in fact, can even become 'liquified' and move more like a liquid than a solid, say, a thick paste, but it's definitely not what you want foundations on. Just reducing the friction of a solid doesn't normally make that solid turn into a liquid, that's why the distinction is important.
The thing with science is that you need to be accurate, not just say « well it acts as if it makes it slippery so it makes it slippery » that’s a shortcut you’re not allowed to make
Something « slippery » has a low coefficient of friction. The water doesn’t lower the soil’s coefficient of friction. So no, it’s not more slippery. There’s just less force applied
@@kindlin I agree, but it also *does* make soil more slippery. The problem is in the usage of non-scientific terms.
@@books2438 "Slippery" does not have scientific definition. It is just relative term for perceived low friction. And water actually do lower soil's coefficient of friction (even when shear modulus is much more important in this topic). Google scientific publications about it or just walk on bare soil when it's raining. It is slippery.
Veritasium: water doesn't make it slippery
Also veritasium: the water reduces friction
Great video, and wow I thought thought coastal British Columbia had a lot of rain, but Yakushima Island in Japan gets about 3x higher! One quibble: at 14:12 the footage is of the great 2011 tsunami (caused by an earthquake), not a flood related to climate change.
10:09 Water doesn't make soil more slippery, it causes it to have less friction, or as most people would say MAKES IT MORE SLIPPERY.
6:42 Someone is diving head first into the water in the background!
I live in the UK which is pretty famous for being a rainy country. So I decided to look up the stats to compare here.
Over a year the UK averages about 1m of rainfall and the rainiest hour was in 1901 in maidenhead with 92mm of rainfall.
Great fact! I'm from England but live in Belfast now. I have noticed that it is significantly wetter here than in Derbyshire where I'm from.
As a native Missourian, when you showed the clip of you standing in the heaviest rain ever recorded I was thinking to myself "I've seen that heavy of rain several times in my life". Not surprised at all that the record was recorded in my state lol
filling the gap Tom Scott left -> informing the public about interesting infrastructure or related research facilities ^.^
Not forever
London Simulator
Person: water does not make the mud slipperier- it’s does the opposite
Explanation- the water reduces friction, making the mud… something
Loved the video!
A friend of mine visited Iceland. He learned how they spot tourists: they're the only ones with umbrellas! The Icelanders told him, "it's just water!"
The Batagaika Crater in Siberia is a good example of how deforestation can cause landslides. It almost a kilometer wide and looks pretty cool on satellite view on Google Maps.
Because I love your videos so much, I'll be pedantic. It's not 'three times less' it's 'one third as much'...
Living here in the Philippines we get so much rainfall as well, I learned a lot in this video about the nature of these landslides and floods and was quite surprised by the information from this video. Btw that Tokyo flood control underground is massive wow!
What you said at end of video is right.
Only that will save.
New one for me,have n't heard about these simulators.