Connor J. Tabarrok ๐๐๐
@ConnorTabarrok
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|Civil Eng in Austin|๐จ๐ฆ/๐บ๐ฒ| Lover of progress, Hater of haters Sincere-posting since 2022 ยกFollow my blog!
Austin, TX
Joined February 2022
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@AaronBergman18
Civil engineer here! There are some problems that emerge when we excavate deep underground, that increase costs significantly. I'll explain a couple of these in the thread below!
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@AaronBergman18
First of all, all soil is not created equal. In areas with shallow bedrock, digging out a large volume of space would be prohibitively expensive. In areas without bedrock, the walls have to be built very thick and deep to resist the pressure of the surrounding soil, see below.
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@AaronBergman18
All that volume that is filled with soil within the walls is space that has to be excavated, and then refilled and compacted, layer by layer to make sure that there is no loose soil in between the walls. You could also use concrete between the walls, to resist the pressure...
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@AaronBergman18
When the groundwater starts to flood your hole at -40ft? This is a very difficult problem and usually involves a ton of pumps, which break a lot because the groundwater is usually mixed with gritty soils. And heavan forbid it rains while you're in that hole!...
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@AaronBergman18
And because changing their building plan from 50 to 75 floors in the unregulated height city is still cheaper than going from 0 to -25 excavated floors in the regulated one, the floors more often just move between markets rather than above/below ground. Edge cases exist but ๐งต
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@AaronBergman18
But you essentially need the walls anyways if you're excavating deeply because what is going to keep the soil from caving in onto the slab while you work on it? Then we get to the question of the water table, which in some places is very shallow! How do you excavate to -200ft...
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@AaronBergman18
The second problem with water beyond infiltration and working conditions is that it's presence can put strains on the structure itself, a concrete tube stuck into soil experiences bouyancy forces just like a boat, so having to displace depthรthe footprint of your buildings...
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@AaronBergman18
Worth of water can really put a lot of force on the building, which can cause it to "float" up through the soil. This necessitates some (expensive) changes to your foundation design, because now you have forces, some of which are dynamic (flooding) in more directions. See below.
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@AaronBergman18
The deeper you go, the more expensive and risky it is to move the next piece of dirt, and the thicker your walls and foundations must be. By contrast air moves itself. Plus the building code is already made for skyscrapers, so there's a first actor disincentive.
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@AaronBergman18
This means that often, even where there is a height restriction in place, developers choose not to build down as far as they could. One thing to keep in mind is that they may build taller in cities w/o restrictions as compared to ones with in order to recoup "lost floors".
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@noah_austin
@AaronBergman18
Thanks for enjoying the thread, but I don't think the question was dumb! If height regulations were super strict in all development markets accessible to investors, it might be true that building down becomes comparably feasible.
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It's completely reprehensible that Peter Singer had so many girlfriends and distributed exactly 0 of them to those in need.
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@ATabarrok
TN is replacing the I-55 bridge rn, (~half as long and has much shorter span length btwn columns) and thinks it could cost $1.5B. They aren't building yet, though, so we should call it at least $2B.
The new F.S.K. bridge will probably be >7B. (union job)
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@devonzuegel
I like the grow through ones because you can choose cool paver shapes and do patterns.
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@zekedup
Ya I only recognized it because I tore uo some roads near there a few years ago and it's on the exit sign lol
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"Actually, whaling is unassailably good because of the welfare benefits to shrimp."
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@YIMBYLAND
I'm a Civil Engineer!
It could conceivably take that much to have a planset that involved no changes and catered to every special interest and environmental review. Less if the train company already owned all the right easements and was exempt from these reviews in both US/CA
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@LeaMaric
In South Florida he's at heavy risk of flooding. Plus the wildlife (especially snakes). The "undiscovered" nature of the cave he found makes me think it could be new, and he might be camping in what is soon to become a sinkhole. 3/10 would pick car.
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@stan_okl
It has been a hundred degrees or more every day for like 50 consecutive days in Texas. I do not wish to wear pants!
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@lioninjawarloc
@readonlymike
Smith is the plateau. He was sometimes as good as Tennant, but never better. After him, it was all downhill.
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๐งตHow I used ๐คAI like ChatGPT๐ค to create and sell courses teaching people to leverage AI tools to create a ๐business๐ that *harnesses* the โจ๏ธnew technologyโจ๏ธ of AI to teach people to create businesses, BUT with the โก๏ธPOWERโก๏ธ of AI... (1/24)
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๐งWater Thread ๐งต:
Civilization has always depended upon water for life. From Hunter-Gatherers and Nomads who followed rivers and migrated to pasture lands, to the first agriculturalists, water was a foundation of human life. But how did ancient people manipulate water?
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@dylanmatt
@Noahpinion
Right, I was thinking about all the retired people on pensions or realizing their tax-deffered capital gains from a 401k or IRA etc.
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@selentelechia
Hydrology trivia! Both basins are both fed from a stream in a place called the Parting of the Waters, where both rivers are downhill. After that, they don't meet up downstream.
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If you've been to a KFC north of the Mason-Dixon line then you have participated in cultural appropriation.
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@zachtratar
Civil engineer here! Islands built in the bay would be likely to be structurally unstable and carry large risk of seismic failure without extremely costly foundation design, because of the deep layer of mud and sand that occurs in the bay.
See below!
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@vikas_ki_baate
@gunsnrosesgirl3
These fridges were often cooled with ammonia gas that would poison you family if it leaked
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Surprising historical fact: in the Greco-Persian Wars (think 300, not Alexanders conquest) there were more greeks fighting on the persian side than on the greek side!
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If you really think AI is going to kill 90% if humanity then why don't you have 10 kids?
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Just got back from 100,000 BCE. Imagine my surprise when I encountered a peace conference between Homo Erectus and Homo Floresiensis. Luckily, we were able to put our rocks together and establish a stable two-state solution.
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I'm scared to open the Pillsbury biscuit can.
A Ukrainian soldier cuts open an M864 DPICM to remove the submunitions so they can be used for dropping from drones.
#OSINT
#UkraineRussiaWar
๏ธ
#UkraineWar
#Ukraine
#Counteroffensive
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@eigenrobot
I think it's largely a weight optimization since that's how farmers get paid. They buy the varieties that most easily take up water with as little soil nutrients as possible and thus dilute the nutrients within the fruit/veg. Curious if this squares berry to berry tho.
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@PaulSkallas
If you renounce your citizenship and have a net worth of >$2M you have to *pay* to stop being a citizen!!!!
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Polling my audience:
What podcast is so good that you would pay >100$ to double the amount of that podcast in existence.
For me, it's Dan Carlin's
@HardcoreHistory
, Hands Down.
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@gptbrooke
My brother and I convinced our parents we were under threat of nuclear war by sending gov missile warning texts telling us to take shelter using a spoofed number to all of our phones and then using a system of BT speakers to play air raid sirens on surround outside the house.
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Apple butter is the south's best kept culinary secret.
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@NationOfJason
@AlexanderGlista
I've done some wastewater treatment plant design in my tenure as an engineer and the effluent water is often cleaner than the water bodies they discharge into. The ocean gets all the runoff not treated by the plant, and the plant has disinfection!
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I can't believe we thought training on millions of Reddit comments would make the AI smarter
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@jmhorp
They've "cured" cancer like 17 times now, I'll believe it when they let us have our carcinogens back
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I cook all my meals with single use MRE chemical heat packs
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As we near the end of the 23-24 Moss Season (in TX, at least), I'd like to take a moment to highlight some of my personal top mosses. Please stand.
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It might surprise you to know that in texas schools they just show Prager U videos to kids for 8 hours
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@_brianpotter
Immigration is our
#1
superpower. There is so much human potential left on the table by visa caps.
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@rmcwhorter99
Tunneling is expensive, especially in a seismically active area like downtown SF (which also has a lot of reclaimed land). But it's not *this* expensive. The rest is probably endless ESG reviews and permits, utility coordination, and the cost of aquiring easements
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@CJHandmer
You can save a lot of money on large scale desal plants by running the rejected water back through a turbine to recover some of the energy from the pressure. It's more effective the more concentrated the salts are because you get more volume and more energy through the turbine.
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@kryptoklob
@TurboThaad
The iPhone was released in 2007. More likely, it was the advent of those godawful center console screen systems, which have been proven to be much more dangerous than phones because of their shitty and confusing UI/UX.
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@MissGinaDarling
I really love tulips by themselves, but tree borne flowers like wisteria have a really nice way of bunching together. Also, I don't know what these white bell shaped ones are, but I like this picture I took of them a lot.
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Check out my new blogpost!
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If you have ever, even for a second, believed in a conspiracy theory, you should put the phone down. Only speak to people you know IRL, and only in person. Otherwise, you will be deceived. Bonus points for forming a cult around this concept.
Something wild is happening on the Midjourney subreddit.
People are telling stories and sharing photos of historic events - like the โGreat Cascadiaโ earthquake that devastated Oregon in 2001.
The kicker? It never happened. The images are AI-generated.
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@LegoRacers2
Fun Fact: The Vikings actually reached and settled Greenland before the "native" Inuit people did!
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No one is talking about it but zoomers are listening to classical music again because of the "playlist to make you feel like a 19th century villain" trend.
There's probably a hundred videos like this with similar viewcounts
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Check out my new post in the Wonders of Our World series, this time taking a look at one of the largest and most extensive hydraulic engineering projects of all time!
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@growing_daniel
I'm working on a model that shows the pressure, flow, etc. of the water supply for a ~20k connection system in the Austin area, and predict based on growth/development which areas will need upsizing/new infrastructure to serve growing demand.
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@cruelsardaukar
Stonewall Jackson (although usually noted for his extreme bravery) also fought a tactically brilliant campaign of defeat in detail against a much stronger force in the Shenandoah. He died young after being shot by a friendly soldier on night-guard duty
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POV: You're about to spend hours pondering
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@alek_dimi
@pli_cachete
Nah isn't it that they all see the other two with smudges but also see their counterparts not immediately wipe, so they infer that they too must be smudged, such that the others expected *them* to wipe first, thus the conclusion from seeing two smudges and nobody wipe = all wipe
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@sChilibeck
@YIMBYLAND
Just think about all the bridges they'd have to construct! Cascadia is full of (you guessed it) Cascades!!
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If you're reading this it's very likely that you have been exposed to more temptations, more mind-hacking, more infohazards, and more excess than any of your ancestors before you. Many of them would have fared far worse than you in the face of these foes. You are strong, too. ๐ฆพ
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@venturetwins
My feeling is that a good # of those boomers are probably bots, and it's the advertisers who are the target?
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@aryelipman
I would fund better sleep science and autonomous transport. If we could all travel in self-driving cars while we sleep, humanity would essentially unlock a once-daily teleportation with an 8 hour driving range.
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๐ค
Who is the aligner and who is the aligned?
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I bet this feels so good for the metal.
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@SpacedOutMatt
Based on napkin math and google: Ostriches max out at 120 eggs per year, while chickens max out at 300. Ostrich eggs are about 24 times as many calories per egg though, so you need to believe that 1 ostrich QALY < 9.6 chicken QUALYs. I say go for it.
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@jasoncrawford
Me too. I don't like the rule about including outside punctuation inside of quotation marks. It's not part of the quote! Why would it go inside!???!? ARGHG
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@ADoricko
@JeffBezos
Amazon and Mcmaster, the two pillars supporting the mighty firmament of tinkery
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Fuck the government boys, it's time to DIG. โ๏ธโ๏ธโ๏ธโ๏ธ
This is amazing. You can buy a tunnel boring machine for the price of a BMW on Ali Express. Free shipping too
H/t
@ScootFoundation
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@generic_void
Just give them MAID. If it's humane enough for 14,000 Canadians, it's good enough for murderers.
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@kryptoklob
@TurboThaad
Hmmmmm, maybe you're right, although I think the youngest (and according to insurance) most dangerous drivers were probably early adopters
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