What is a Hydraulic Jump?

Go to NordVPN.com/practicalengineering to get 75% off a 3 year plan. Use code PRACTICALENGINEERING to get an extra month for free.
Engineers need to be able to predict how water will behave in order to design structures that manage or control it. And fluids don’t always behave the way you’d expect. On this episode of Practical Engineering, we’re talking about one of the most interesting phenomena in open-channel flow: the hydraulic jump.
-Patreon: patreon.com/PracticalEngineering
-Website: practical.engineering
Writing/Editing/Production: Grady Hillhouse
This video is sponsored by NordVPN.


  • Danger, Danger, Danger, Will Robinson. Hydraulic flows can catch a guy in the water and beat him to death. A good engineer always thinks of his people.

    ARailwayARailwayVor 2 Stunden
  • Thanks for sharing this wisdom, never considered this wisdom... but it's for sure worth knowing as I moved to nature from the City and I'm looking forward to backpacking through Bankhead National Forest right near me in Alabama. Again, I came back here because I saw your comment and responded to in on Samm Shepherd that I just found on YT only to seek out the latest video was his Father. God Bless Practical Engineering and thanks again for sharing your learnt with us. Keep blessing us, but most important, your family and God. Amen. Be sure to subscribe to Practical Engineering and select the Bell for notifications or new content. Peace be with all my Dearly Beloved. The Water of Life shall make you thirst no more. Come home lost Children, the Father is waiting patiently. Amen.

    Fredrick HightFredrick HightVor 9 Stunden
  • I assumed civil engineering was boring, how wrong I was

    Daniel PriceDaniel PriceVor 16 Stunden
  • I am a civil engineering student myself and couldn't understand much and had to learn by intensive repetition thanks to your videos I have to no longer do such things . By telling the truth i can keep everything on mind.

    sulav ranjitkarsulav ranjitkarVor Tag
  • not watching 8 minutes....

    Paulie MorbolPaulie MorbolVor Tag
  • Saw this psudo-hydraulic jump in the sand. Pretty cool to see sand acting as a fluid. www.reddit.com/r/oddlysatisfying/comments/arc1dl/oc_the_way_this_sand_falls_on_this_sand_dune_in/

    David BlairDavid BlairVor Tag
  • Were pyramids built by Egyptians with logs, ropes and copper chisels?

    MrBimber55MrBimber55Vor 2 Tage

    SAMBIT KUMAR PradhanSAMBIT KUMAR PradhanVor 3 Tage

    SAMBIT KUMAR PradhanSAMBIT KUMAR PradhanVor 3 Tage
  • hey grady, could you do a video about oscillations on a bridge caused by wind??

    splostacesplostaceVor 5 Tage
  • Hello, could you say something about Hidroituango?

    infundereinfundereVor 5 Tage
  • FYI if you get caught using VPN in China, you can face thousands dollars of fine and potential prison sentence. (Yes they always know, it's just a question of whether they want to go after you)

    greentjmtlgreentjmtlVor 5 Tage
  • id love to see you talk about this mealsdelivered24x7.us/detail/video-tOG8A0tGP3Q.html

    ncktbsncktbsVor 5 Tage
  • Great explanation of fluid dynamics and a brief overview of hydraulic engineering. Facts are important.

    Adena PropertiesAdena PropertiesVor 5 Tage
  • Sir please explain stream line, Streak line,path line, etc

    shree shreenushree shreenuVor 6 Tage
  • 5:55. Minnesota represent!

    The GeneralissimoThe GeneralissimoVor 6 Tage
  • So many subs for so few videos. I smell something that's not right.

    john hardinjohn hardinVor 7 Tage
  • Grady can you go more videos on geotechnical

    Mikku Thomas JohnMikku Thomas JohnVor 7 Tage
  • Fancy names for the different speeds and intersections of water

    V1 GibbyV1 GibbyVor 7 Tage
  • Sir please mention subtitle in english bz some of the concepts are unable to understand

    Vishwajeet gunjal patilVishwajeet gunjal patilVor 7 Tage
  • Excellent video sir.....Will you please make a video on ''investigation of ground water"?

    ashok amaraashok amaraVor 7 Tage
  • I understand some of these words

    Undr GrndUndr GrndVor 8 Tage
  • you can tell he's an engineer because his shirt is wrinkled.

    ndgondgoVor 8 Tage
  • Totally amazing used it for my notes cuz I’m trying to study at home thanks a bunch. Made me think about stuff I usually don’t consider

    Michael III KaricasMichael III KaricasVor 8 Tage
  • A very helpful information. Thanks for the video

    Saiteja GudepuSaiteja GudepuVor 8 Tage
  • Thank you, ever since hearing this mentioned in a documentary about aqueducts build by laying out terracotta pipes through mountains with open channel flow in them I wanted to know specifics. The pipes needed ambient pressure and steady flow in them to remain sealed, thus they needed very constant gradient avoiding the water to jump anywhere.

    0MoTheG0MoTheGVor 9 Tage
  • Was that kayak clip at the end taken in Utah at the Weber river?

    Austin The CleverAustin The CleverVor 9 Tage
  • Dániel PálDániel PálVor 9 Tage
  • I live in the Foothills of the Great Himalaya and we have bunch of river flowing very close to the house.....so I grew up watching hydraulic jumps , but didn't actually knew that it was a Hydraulic jump...so thanks and I will (if it happens) look out for it ....

    Sohom ChatterjeeSohom ChatterjeeVor 10 Tage
  • I should have know this when I was studying in college . Thanks for this video

    Pudumai SeelanPudumai SeelanVor 10 Tage
  • I am a civil engineer and I like hydrology 😊😊

    Pudumai SeelanPudumai SeelanVor 10 Tage
  • Interesting, thanks!

    1pcmedic1pcmedicVor 10 Tage

    TsantoulisXTsantoulisXVor 10 Tage
  • So if I take a 1/4" ID tube and let water drop from the end 3' into a pool below it will splash. Is that splash partially, completely or not at all hydraulic jump?

    SomeUser421SomeUser421Vor 11 Tage
  • Nicely done! Would love to see more about flow measurement devices like Parshall Flume

    Mohit AwasthiMohit AwasthiVor 11 Tage
  • Hi Grady - what's the biggest project you've ever worked on with a high level of influence? What was your role?

    JulianShagworthyJulianShagworthyVor 12 Tage
  • I'm thinking of being a civil engineer when I'm older but I don't know what qualifications I need Please like this so that he will see it

    backyardsailingbackyardsailingVor 12 Tage
    • The best place to learn what requirements you need to enter an engineering discipline is from a college or university school of engineering. They will have the course work required on their website. Another place to go is your guidance counselor.

      DominicDominicVor 7 Tage
  • I had my Open-Channel water flow exam just a month ago, you're al little lare ;) Good vid !

    BatagnamBatagnamVor 12 Tage
  • Very interesting indeed! Thanks for posting.

    Jeremy FieldingJeremy FieldingVor 12 Tage
  • You should look up Brennan's Wave in Missoula, MT. It's a man-made hydraulic jump for surfers and kayakers on the Clark Fork River. I never knew the physics of it until now, thanks!

    nihildarknihildarkVor 12 Tage
  • A fine channel. But the background music doesnt fit and is so annoying that it is distracting.

    royster Futrellroyster FutrellVor 12 Tage
  • I hit one of those hydraulic jumps head on while white water rafting in Costa Rica , and I got sucked into the water and out of my raft. Scariest and most awesome moment of my life

    Madison GrootersMadison GrootersVor 13 Tage
  • 'Energy dissipators'??? Why not just install a bunch of turbines and harvest said energy? Seems like a waste; as we burn through the last of the fossil reserves...

    Felix MarchenkoFelix MarchenkoVor 13 Tage
  • Fantastic video!! Thanks for sharing 😃🙌🏻

    Eric MackintoshEric MackintoshVor 13 Tage
  • Look video!

    Kevin AubinKevin AubinVor 13 Tage
  • I always knew Opie Taylor would grow up to be somebody.

    Gunther Ultrabolt NovacrunchGunther Ultrabolt NovacrunchVor 13 Tage
  • Hey, I have a hydraulic problem: how do you extract water from wet materials constantly and without the use of aditional energy. (To simplify: make a wet towel drip without using energy(maybe weight it down?))

    mego dstamego dstaVor 13 Tage
  • When I first looked at the thumb nail it looked like lines if coke lol. Great video!!

    Eric FragassiEric FragassiVor 13 Tage
  • 666k views? Satan worshipers confirmed

    IwasakiIwasakiVor 14 Tage
  • i call it splashing

    abcpeaabcpeaVor 14 Tage
  • One day, dimensional analysis will be 100% accurate.

    FheroahFheroahVor 14 Tage
  • Ive actually seen a vid recently about how dangerous these can be for kayakers and swimmers. the turbulence can drag you under and hold you there.

    Zaku186Zaku186Vor 14 Tage
  • Hey.. this isnt Giaco Whatever

    Persona SlatesPersona SlatesVor 14 Tage
  • little kid swims big hydraulic jump mealsdelivered24x7.us/detail/video-TGrnwIvrZLY.html

    Artemas WardArtemas WardVor 14 Tage
  • bad video, bad explanation, mediocre research.

    M 3M 3Vor 14 Tage
    • I'm looking forward to viewing your vastly improved video on this topic.

      Andy RixAndy RixVor 14 Tage
  • You know what else NordVPN advertises on? Pirated software websites.

    soundsparksoundsparkVor 14 Tage
  • Also there are internal hydraulic jumps within stratified fluid, such as tidal currents in fjords.

    Peter GalbraithPeter GalbraithVor 14 Tage
  • Thanks for the video from Bogotá Colombia. 👍👍👍

    Cesar GuajeCesar GuajeVor 15 Tage
  • St. Anthony Falls, represent!

    LevDotComLevDotComVor 15 Tage
  • Dude, you have 845k subscribers. Time to upgrade your mic/sort your audio!

    intravenaintravenaVor 15 Tage
  • Where is the screen from your sink Mr engineer?

    Stanley BanksStanley BanksVor 15 Tage
  • "I owe my marriage to VPN..."

    Vladimir PutinVladimir PutinVor 15 Tage
  • Love your vids

    Kim PedersenKim PedersenVor 15 Tage
  • Up your microphone game bro

    Kenneth JamesKenneth JamesVor 15 Tage
  • Excellent!

    bunberrierbunberrierVor 15 Tage
  • Cool! Similar things happen with electrical impedance mismatches in AC.

    Zack StewartZack StewartVor 15 Tage
  • Had trouble getting this. .... then 4:03 happened...and AHA! Great video.

    I digressI digressVor 15 Tage
  • I have no idea how autoplay got me here. And even less idea why I was compelled to watch it all. Great learning experience!

    SevenThree1775SevenThree1775Vor 15 Tage
  • The acrylic demo just looks like water crashing into a significantly deeper reservoir. That's not very impressive. Of course a 3mm thick sheet of fast moving water is going to stop when it hits a pool that is 10x deeper. The sink demo was much more impressive to me.

    Andrew DelashawAndrew DelashawVor 15 Tage
  • Love your videos!

    Martin LeeMartin LeeVor 15 Tage
  • I like fluid mechanics

    Adzhan BekzatAdzhan BekzatVor 15 Tage
  • Hydraulic Jump also occurs in another fluid... When air moves over a mountain range, a hydraulic jump can form on the other side and condensation can result, although it is often confused with the much more obvious Lenticular cloud of "wave lift", a separate phenomenon.

    sammy kellersammy kellerVor 16 Tage
  • very nice video

  • Stop it Grady, all a vpn does is exchange one person watching you to another

    Anthony CoteAnthony CoteVor 16 Tage
  • That hydraulic jump at 3:58 propagates just like a normal shock. This is so cool--I've never seen the analogy with supersonic flow so clearly! Just replace the sound speed with the surface wave velocity. So this really is rocket science!

    Chris PieronekChris PieronekVor 16 Tage
  • Shoutout to r/HydraulicJump on reddit! www.reddit.com/r/HydraulicJump/

    BebxBebxVor 16 Tage
  • Love all your videos, wondering if you'd ever do a video on the "tesla valve". love how fluid dynamics can also be applied to airflow.

    jap pperonjap pperonVor 16 Tage
  • Nicely done, including the segue into NordVPN at the end. Where is that glory hole at 1:12? It's beautiful and scary at the same time.

    KutWriteKutWriteVor 16 Tage
  • Helluva tie-in for that native advertisement. I'm not hating on it at all...that's awesome.

    OnumaOnumaVor 16 Tage
  • You didn't really explain the physics though

    Sho Yu WeeniSho Yu WeeniVor 16 Tage
  • I don’t know but I dreamed of jumping a spillway on a B.m.X growing up!!!!!🤢🤮 so sick!

    vince Fossvince FossVor 16 Tage
  • I like the video but somehow I get the feeling you never really explained what a hydraulic jump actually is..

    Laurens PeekLaurens PeekVor 16 Tage
  • You're lucky your wife didn't end up in a labor camp building iPhones.

    Brett DeLongBrett DeLongVor 16 Tage
  • Great content, as always, but dude... Your post-video spot was really quite... Creepy and disturbing. The uncanny valley of trying to mix the personal with a mechanical dictation of a script seemingly provided by the sponsor made me actually reconsider the continuation of my current plan with the provider. I had no idea if your wife used to work in China, but after this spot I'd see that as less of a probability than before. The whole spot is so blatantly dictated by the marketing team of your sponsor (whether it is "somewhat stretching the facts" or a downright lie) that it portrays you as disingenuous and your sponsor as downright shady. A consumer reads into these as they would to an unsolicited email advertisement on male enlargement products. Please, for the love of god (as much of an atheist I might be), never accept further sponsored scripts superficially tailored to you. Either recite a generic script, which the consumer can recognize as such, or write your own script that's true to you (the LTT-approach, not readily available for smaller channels). And the same goes for advertisers, don't repeat this faux pas. There's no natural middle ground. Write the script or let the content creator write it.

    HV G+ Pilaat KaikenHV G+ Pilaat KaikenVor 16 Tage
  • Thanks for helping me learn something cool today!

    geaRgeaRVor 16 Tage
  • Mate, you know that NordVPN although paying you a lot money to advertise, also cheat customers and after 30-day cancelation period literally butcher bandwidth you get?

    Michał GołuńskiMichał GołuńskiVor 16 Tage
  • I find fluid dynamics absolutely fascinating.

    arcticfoxarcticfoxVor 16 Tage
  • this is so cool! im an electrical tech but this is like brain candy lol Its a lot like electrical with subtle differences. Is that a coincidence?

    Richard JolyRichard JolyVor 16 Tage
  • fascinating!

    Victor Tarabola CortianoVictor Tarabola CortianoVor 16 Tage
  • Please translate into arabic

  • They're also infamous for killing people. Especially hydraulic jumps at the base of low head dams. The hydraulic jump there almost always causes the water at the surface to flow backwards, so that things that float (such as tourists in canoes) get trapped there and drown. "It's only a two foot drop, and a slight incline. I'm sure we can paddle past it without beaching the canoes. How bad could it be?"

    R JohnsonR JohnsonVor 16 Tage
  • Disliked because of adv

    Amir orangeAmir orangeVor 16 Tage
  • A Hydraulic Jump is a Hydraulic Jump

    AcherAcherVor 16 Tage
  • Ok so what's a hydraulic jump?

    Felix StratmanFelix StratmanVor 16 Tage
  • Wary interesting video that I fund by luck. First, I have no knowledge on the subject at all!! But I am thinking if you build a model of a dam or something to investigate on how water will behave, do that give any usable data at all? What I mean is that the water drops will be totally different in size, compared to the model and the real structure.

    Fried MuleFried MuleVor 16 Tage
  • I'm sorry but I just don't get this video or its intention. A very simple and obvious physical phenomenon is explained so long and with such vague examples that it leaves the viewer more confused and uneducated that he was before he watched this video. When a fast moving stream of water hits a still body of water it slows down and swirls in all directions. What the heck else is to it?! What were you trying to explain?

    Maloy7800Maloy7800Vor 16 Tage
  • Brilliant ,TY 👍👏

    Mark LettsMark LettsVor 16 Tage
  • NordVPN keeps records of your internet traffic. Private Internet Access does not. Go with the PIA VPN. Especially if you are a pirate. They can't subpoena records that don't exist.

    ComocosonoEWLComocosonoEWLVor 16 Tage
  • Not only is water erosive, it is also corrosive as well... Most engineers know this tho

    GmonGmonVor 16 Tage
  • OP should take a whitewater kayaking class. The opportunity to explore natural water flows through whitewater paddling is huge. It's a ton of fun and a great experience for us engineering types. Paddlers tend to call hydraulic jumps "holes" or "hydraulics". There are dangerous ones and fun ones, depending on the size and the "corners". If the corners of the hydraulic are downstream, then it makes it easier to get out. Big hydraulics with upstream or even corners can be deadly.

    AGeekNamedRossAGeekNamedRossVor 16 Tage
What is a Hydraulic Jump?