The Los Angeles Aqueduct Is Wild (practical.engineering)

by michaefe 208 comments 414 points
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208 comments

[−] jedberg 57d ago
The norcal/socal divide caused by the river is funny to me. I grew up in LA, then moved to the Bay Area for college. In LA we never really talked about where our water comes from. But we were always 'in a drought' and always taught to conserve water.

My wife grew up in the Bay Area, and was told the same.

But her family is from Sacramento. Up until about 15 years ago, everyone in Sacramento paid the same for water (based on square footage of your home). There were no water meters. So they didn't conserve. They ran the sprinklers in 100 degree heat for hours, they washed sidewalks with water instead sweeping, and all the other things.

But when the meters came, her Uncle blamed SoCal for "stealing his water". He complained every month when the bill came about how he has to pay more now because of SoCal.

[−] kenhwang 57d ago
Owens valley, where LA "steals" water from, is on the eastern side of the Sierras.

NorCal, including Sacramento, is on the western side of the Sierras.

So unless they planned on pumping the water over/under the mountain range that surrounds it in every direction except for towards LA, that water was never available for any NorCal city to use.

[−] mutagen 57d ago
The California Aqueduct delivers water from the western Sierras through the Central Valley and to Los Angeles. This is likely what NorCal refers to when they say SoCal is 'stealing our water'.

https://en.wikipedia.org/wiki/California_Aqueduct

Would be interesting to see the relative amounts of use by LA and by agriculture in the Central Valley though.

[−] vondur 57d ago
Owens valley is basically dried up from the water that LA takes. It's interesting as you drive in the towns in the Valley and you see all the LA Department of Water and Power offices over 200 miles from Los Angeles. The courts had to force the LA DWP to quit taking too much water from the streams that feed Mono Lake as it was in danger of drying out.
[−] jlhawn 57d ago
they are saying that LA takes water from sources which would otherwise drain into the sacramento and san joaquin river delta. The video from this post mentions the California State Water Project which takes water from the Feather River (Oroville Dam) and distributes it along the Western edge of the central valley South to Bakersfield where it is then pumped over the mountains both towards Los Angeles and further East to San Bernardino and Riverside. It provides way more water to SoCal than the two Los Angeles-specific aqueducts from the Owens Valley on the Eastern side of the Sierras.
[−] dgaultiere 57d ago
LA also gets water from the state water project which does come from northern california: https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Ca...
[−] dpe82 57d ago
Old men yelling at the sky don't often seek rationality or nuance in their cries.
[−] jsLavaGoat 57d ago
Yes, Norcal spent decades wagging fingers at SoCal about this. There were books like Cadillac Desert.

Meanwhile, San Francisco drinks clean glacier water that a valley in Yosemite was destroyed to provide this and they refuse to repurpose a downstream damn that has enough capacity to do it.

Physician, heal thyself.

[−] ccorcos 57d ago
I grew up in Sacramento and I remember when my parents were had a flat rate water bill. Those were the good ol' days!

It frustrates me how everyone moralizes water use rather than accepting that free markets allow for people who are simply willing to pay for it. For example, if you live in Sacrmanto and don't have a pool, you're just doing it all wrong (in my opinion, of course).

I watched my friend's family farm in Modesto flood their fields to irrigate them. No meter, just a valve off the canal and they pay a flat rate. So it offends me that my shower head is legally required to restrict it's flow. Or that neighbors decide that a pile of rock in the front yard is "better for the environment" as it radiates heat on a 105°F day...

[−] strongpigeon 57d ago
Sometimes it feels like the US has lost its appetite for grand structural projects like that. Maybe it’s just that I’m unaware of them and that impression is the result of survival bias, but given how impossibly hard it is to just build anything where I live (Seattle), I’m not so sure.
[−] notepad0x90 57d ago
Looking at what Tehran is facing (not related to the war, water shortage), I'm wondering why california isn't investing in more desalination for SoCal, especially for LA.

I see some here:

https://lynceans.org/all-posts/status-of-desalination-plants...

But there are only a few in SoCal and they're for smaller communities like carlsbad or santa barbara. So it is there and it is working for some, why not more? naturally i assume it's because everything costs more at the coast.

[−] gorfian_robot 57d ago
Being from LA, I am used to a water system that works without needing power. I think most of CA is like that. It was a surprise to lose the water back east when the power went out during a storm.
[−] PeterStuer 57d ago
Why is that picture an extreme recolor of the original?

https://images.nebula.tv/5ba7e541-f57c-44cc-a91d-6a89bad158d...

[−] z3ugma 57d ago
"Well There's Your Problem" on the collapse of the St Francis Dam, mentioned in Grady's video https://www.youtube.com/watch?v=hxLgM1vnuUA

Also I love when they refer to it as the "_First_ California Water Wars" in a grim realization of the future of water scarcity in the West

[−] kyledrake 57d ago
I was in Owens River Gorge last week, it's a very interesting place. It has some of the tallest single pitch rock climbing in the world, sometimes requiring 80M ropes: https://www.mountainproject.com/area/105843226/owens-river-g...
[−] KerrAvon 57d ago
If anyone wants a deep dive on this subject: https://en.wikipedia.org/wiki/Cadillac_Desert
[−] retrac 57d ago
There's a poem carved into the stonework of Washington Union Station, part of the art installation The Progress of Railroading from c. 1909:

the old mechanic arts / controlling new forces / build new highways / for goods and men / override the ocean / and make the very ether / carry human thought

the desert shall rejoice / and blossom as the rose

[−] hnburnsy 57d ago
My favorite part of this video is where they divert and dry up one lake, and then build two reservoirs further downstream.
[−] CommenterPerson 56d ago
I love Practical Engineering. Grady Hillhouse's enthusiasm for engineering shows through brilliantly. Being a graduate engineer, I've learned a lot from his videos and transcriptions. Well worth browsing practical.engineering.

PS: and it is NOT about software engineering LOL!

[−] rimunroe 57d ago
I was surprised to find out it was largely uncovered, though I guess it probably makes it much cheaper to construct. I usually think of aqueducts as pipes or tunnels, like Persian qanāts. I wonder how much water is lost due to evaporation.