Posted by MarkB_MI on December 09, 2020 at 07:04:45 from (174.245.18.205):
In Reply to: Re: Water pipeline? posted by David G on December 09, 2020 at 06:22:35:
> There are pipelines, just not that long.
You will find very few aquaducts where water is pumped uphill. Almost all are gravity-fed, and in the rare cases where pumps are used, it's usually when tunneling isn't practical. The California Aqueduct uses pumps to get water over the Tehachapi Mountains, where they consume over half a gigawatt of electrical power. Water is also pumped through the Adams Tunnel on the Colorado-Big Thompson Project, but more power is generated on the east side of the project than is used by the pumps on the west side.
> I think desalination is a better solution for the coastal areas, leave the water in the mountains.
Water has to get very expensive before desalinization makes sense, certainly far more than agriculture is willing to pay. It's also environmentally unfriendly, consuming a lot of electricity and raising the ocean salinity near the plant. California has a few desalinization plants on its coast, one of the few areas in the US where it makes sense.
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