Live data from Hacker News

It's 2024 and drought is optional

asteriskmag.com

41–50 of 54 posts

Re: It's 2024 and drought is optional

#41

Love the vision. Feels like something that can’t get done and isn’t proposed as viable - if a RE developer tried to do it for profit, they’d get shut down - ironically probably by environmental groups - govt doesn’t actually build anything audacious anymore Unless I’m missing something?

Maybe he’s hoping a well meaning billionaire will want to try it

Re: It's 2024 and drought is optional

#42
post #26
post #5

Earlier quoted context omitted.

This gives Southern California including LA a listing as a single supercity population 24.4 million which is close but not quite there. https://en.wikipedia.org/wiki/List_of_megalopolises

That’s a goddamned stretch if ever there was one. SoCal is more or less a recognizable region in California, and does indeed have almost 24M people, but nobody sane would call it a megalopolis without some weird agenda I can’t quite figure out. Los Angeles is a city of about 3.9M. LA County is well, apparently experiencing some population decline because last I checked this was a little over 11M, but apparently as of…

A megalopolis isn't characterized by a placename and an airport. It's characterized by continuous development. You can drive from Ventura to Yucaipa to to Temecula to Rosarito Beach in Mexico, and the only time you'd need to get a mile away from of high-density development is 5 miles of I-15 in a mountain pass, or 10 miles of coastal highway, both to span the Santa Ana Mountains (property of the US Forest Service / Cleveland National Forest for the most part).

The Los Angeles Conurbation is about to swallow the northern Imperial Valley as well, because the I-10 corridor is made up of flat sandy dirt that could be a suburban back yard.

Re: It's 2024 and drought is optional

#43
post #34

Earlier quoted context omitted.

Yeah I don't think you can just dump it in the top end of the gulf of california, especially if that's where you're sourcing feedwater.

Why not? Existing ocean currents in the Gulf of California driven by wind, tides, and thermohaline circulation are on the order of 10cm/s, tens of kilometers wide, hundreds of meters deep. Very little of that is associated with local rivers, which are relatively tiny because the whole region is extremely arid. Are you going to be desalinating 0.1 km^2 of water per second? The Sun pumps a thousand watts a square meter…

The brine doesn’t spread out automatically, it sinks, and it’s deadly to aquatic life.

Re: It's 2024 and drought is optional

#44
post #34

Earlier quoted context omitted.

Why not? Existing ocean currents in the Gulf of California driven by wind, tides, and thermohaline circulation are on the order of 10cm/s, tens of kilometers wide, hundreds of meters deep. Very little of that is associated with local rivers, which are relatively tiny because the whole region is extremely arid. Are you going to be desalinating 0.1 km^2 of water per second? The Sun pumps a thousand watts a square meter…

The brine doesn’t spread out automatically, it sinks, and it’s deadly to aquatic life.

It does spread out automatically. We call it diffusion.

Diffusion can also be assisted with very modest power requirements.

Re: It's 2024 and drought is optional

#45

Love the vision. Feels like something that can’t get done and isn’t proposed as viable - if a RE developer tried to do it for profit, they’d get shut down - ironically probably by environmental groups - govt doesn’t actually build anything audacious anymore Unless I’m missing something?

The CAPEX seemed a bit glossed over. $50ish billion isn't a small ask.

Perhaps I missed a zero somewhere, but 5MAF/yr would require pumping 6,900cfs of water to/from the gulf with 230+ft of head. We're going to need a bigger boat.

Re: It's 2024 and drought is optional

#46
I wonder how alternative energy sources would change the math on this project. Is there a small scale or phased approach possible where a desalination plant with 1/5th the final capacity is built first? Big massive, all at once projects seem more likely than not to fail. (High speed rail anyone?)

Re: It's 2024 and drought is optional

#47
post #29

> Last year, the world installed about 437 GW of solar electricity, or roughly one acre of panels every 10 seconds How can that be true. That's over three million acres. Really?

Are you saying it isn't very much?

It's about equivalent to a single larger US county (but well down the list from largest).

Re: It's 2024 and drought is optional

#48
The reality is that 80-90% of all water used in California is used for agriculture, and about half of the produce is exported to other states and countries. All other uses of water including residential, commercial, golf courses, lawns and all the rest account for only 10-20% of the water used.

Sacramento, a virtual desert, is surrounded by rice fields, with huge exports to Japan.

Effectively California’s farmers are selling its water to other places in the form of produce.

Re: It's 2024 and drought is optional

#49
post #26
post #5

Earlier quoted context omitted.

This gives Southern California including LA a listing as a single supercity population 24.4 million which is close but not quite there. https://en.wikipedia.org/wiki/List_of_megalopolises

That’s a goddamned stretch if ever there was one. SoCal is more or less a recognizable region in California, and does indeed have almost 24M people, but nobody sane would call it a megalopolis without some weird agenda I can’t quite figure out. Los Angeles is a city of about 3.9M. LA County is well, apparently experiencing some population decline because last I checked this was a little over 11M, but apparently as of…

[deleted]

Re: It's 2024 and drought is optional

#50

Love the vision. Feels like something that can’t get done and isn’t proposed as viable - if a RE developer tried to do it for profit, they’d get shut down - ironically probably by environmental groups - govt doesn’t actually build anything audacious anymore Unless I’m missing something?

Actually, Arizona is quietly advancing a plan to do desalination with Mexico, and Arizona has a history of building audacious infrastructure (New highways, etc). We will probably see desalination but it won’t come out of California.
Post reply on HN