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13,162,211 Views ⢠Jun 7, 2022 ⢠Click to toggle off description
Worksafe BC video:    â˘Â Incident Investigation: Worker Pulled... Â
Next time you see a dam, retaining wall, caisson, or any other subsurface construction, thereâs a good chance that engineers have had to consider how groundwater will affect the stability. Even though youâd never know theyâre there, some combination of drains and cutoffs were probably installed to keep the structure (and the people around it) safe and sound.
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Practical Engineering is a YouTube channel about infrastructure and the human-made world around us. It is hosted, written, and produced by Grady Hillhouse. We have new videos posted regularly, so please subscribe for updates. If you enjoyed the video, hit that âlikeâ button, give us a comment, or watch another of our videos!
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Producer/Writer/Host: Grady Hillhouse
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Views : 13,162,211
Genre: Education
Date of upload: Jun 7, 2022 ^^
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YouTube Comments - 1,918 Comments
Top Comments of this video!! :3
I was told a story years ago about a farmer who finally got around to pulling out an old tree stumpâŚand then his nearby pond dried up. For a couple hundred years those tree roots were all that had been diverting groundwater to keep the nearby pond filled. Ground water hydrology is fascinating.
887 |
I'm an engineer and the concepts that you can efficiently describe in 10 minutes are worth hours of reading a text book. Love your videos!
205 |
I've gotta say, Grady. I've noticed an uptick in the frequency of the videos you're posting lately. But no negative change in quality. I just want you to know that the effort you put in to make that happen is not in vain. I appreciate every iota of time and energy that you've put into this channel. It brings me and in excess of 2.68 million people a great deal of joy. It may not seem like much sometimes from your end. But one of your videos can be the difference between a crappy day getting me down, and forgetting why I even felt crappy in the first place. You really do change lives with this stuff. Not to mention how many you've inspired to pursue (civil) engineering.
1K |
this definitely explains why, after resolving water management issues at my house, it only took a few months for water to find its way back in to the udrain and thereby to the sump.
309 |
Grady, I just want you to know that I've been watching your channel for years but I was able to put one of your videos to practical use yesterday. My grandmother (who grew up one of 8 kids on a tobacco farm in Rockingham, NC) had seen both water towers and grain bins all her 88 years but never known what they do/are for, since on her farm they used a well and drying sheds. Out of nowhere she asked me that while we were driving. I was able to mostly explain it to her because of your video on water towers and Destin's video on "Smarter Every Day" about grain bins. When we got to the house, I showed her both videos. I wouldn't have been able to answer her without you guys so I'm thanking you both.
85 |
A year or so ago I started working on the administrative side of a firm that does a lot of design and construction involving wells, lift stations, and so on, so these videos have suddenly become much more relevant to my daily life as I encounter the terminology on a regular basis! Thanks for building acrylic models in your basement.
7 |
It's insane that he managed to explain something in 14mins that took our tutor two 2hr lectures. I can't believe we're paying 9.25k a year for content that's taught far more effectively on Youtube.
1.8K |
Just gotta say, I LOVE how the crane in the background slowly builds more and more with each video â¤
78 |
I live in a town that apparently used to be a swamp or marshland on top of being in a geological bowl, so we flood almost every storm. it never occurred to me how difficult it would be for a civil engineer in this area. I love your channel cause it helps me notice these things
102 |
Great video, I'm a senior cad tech of 23 years and have done numerous dam inspection, monitoring and removal projects over the years. I usually get all the drilling and survey data and make detailed plans showing all the data. Your video was very well done sir! Just a month ago our survey crew went out to a dam that we had been monitoring for at least 15 years and was recently dewatered. I was shocked that the crest of the earthen dam sunk by a few inches after dewatering lol.
33 |
i have very very little formal education but you make these explanation videos so well that i always come out of them with a decent understanding of whatever the topic was when i previously had no understanding of it. a testament to the quality of your work. keep it up!
215 |
I love this channel, thanks for educating us on YouTube university.
79 |
I was introduced to this concept during flood defense. Turns out it's too expensive to shore up a river with miles of concrete so you have to rely on good solid earth... And when the water level rises too far, any water seeping through is a threat that can only be contained by, not blocking the exit hole, but building a cylinder of sandbags around the exit that allows the water level to rise to the level of the river on the other side, equalizing pressure and stopping flow.
It's all so counterintuitive for laypeople!
42 |
One of the challenges of a great educator is to simplify concepts and tame complexity while keeping it scientific.
You excel at this and manage to make me understand and be fascinated and value all engineering work.
5 |
I've never been more glad to live somewhere where there is only 6 inches of soil before you hit rock.
It always amazes me to see people digging really deep holes with nothing more than a shovel. If I do anything more than scraping the surface I have to break out the pickaxe or power tools.
182 |
Hi Grady - Is it possible for you to do a video on the effects of over-pumping ground water for potable municipal water supplies? We live in Florida where the soil is sandy and population has been growing fast. Intuitively - I believe the result has been that the local water table around these âwell-fieldsâ gets lowered to a point where organic s in the soil are exposed to oxygen. The organics decompose leading to subsidence, often in residential areas where foundations are not built strong enough to resist pressures. Added to this were development practices where organic fill or âscrapingsâ were used to level certain areas to create more usable lots. With 5 feet of clean inorganic sand placed on top. Iâm speaking from personal experience here documented with subsurface samples and ground penetrating radar studies. The part I am not familiar with has to do with the effect (for potentially miles around) of a lowering of the local water table. Not to mention saltwater intrusion when drilling near the ocean where most of Floridaâs population lives. Mostly Iâm interested in the more general hydrological engineering considerations as a result of âover pumpingâ the aquifer. Water is very expensive in Florida for these reasons. Most communities use reclaimed water to lower the pumping demand.
776 |
I remember this one, they never did recover that worker's boots.
RIP WorkBoots
17 |
I love that acrylic sand water flow demonstration! There are so many little experiment you could do with it. Groundwater is super interesting and I am always trying find ways to tie in fresh water with my classes--now I have another rad application! Thanks!
7 |
The demonstration really shows how surprisingly well water follows Darcy's law. Having a degree in mathematics I've seen my share of the Laplace operator :-). However, obviously the model will break down for fast flow rates and when the soil starts moving. When a evaluating a construction design, are there some well-established limits for the model validity? How slow should be flow be to trust that the soil stays in place?
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@MrBlueBurd0451
1 year ago
Living in the Netherlands, water, and especially groundwater, is a massive part of life around here. It's good to finally learn how we control all that when building anything a meter below sea level.
2.9K |