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When something is this difficult to do, maybe the rational thing is to ask whether you should be doing it at all. Agriculture in California uses more water than industry and households combined. Yet, when the drought hits, households are asked to cut back on watering their lawns, while the state is looking at spending literally billions of dollars to subsidize farmers who planted water-hungry crops (like almonds, or alfalfa) in the middle of a desert.
It is more a problem with the meat industry. Growing feed for animals and then eating their flesh instead of just growing food.
Curious about the downvote. I've heard this argument before -- what's the problem with it?
It isn't. The problem in California isn't due to grains, which are annual crops. The problem is due to farmers planting water-hungry perennial tree crops, like almonds. The problem with perennials is that they take three to four years of constant reliable water to grow properly and produce crops. Somehow, in the middle of the largest drought in California history, you have farmers who believe that it's all right to plant crops that require years of water before they become profitable. That's the core of California's water problem, and why I have very little sympathy for California's current plight.
I think we can reasonably draw a distinction between almonds and alfalfa. Almonds are a high-value crop; if farmers had to pay more for water, they would still grow almonds, earning money that helps bolster the state's economy. Alfalfa, on the other hand, is a low-value crop, arguably worth less than the true value of the water used to grow it. And much of California's alfalfa is shipped to China. We may as well be exporting water to China at a discount!

EDITED to add: while alfalfa exports to China have been increasing in recent years, we ship to several Far East countries, and the largest consumer, by a bit, is still Japan. See graph near the end of [0].

Actually, if anything, I think the distinction is unfair in the other direction. Alfalfa is a lower value crop than almonds, true. However, as an annual, alfalfa comes to maturity relatively quickly, and doesn't require much in the way of ongoing water. As a farmer, if I plant alfalfa this year, it's very easy for me to sell the alfalfa and switch to something else next year when water prices go up.

Almond trees, on the other hand, require three to four years of water before they become mature enough to produce fruit. That means, as a farmer, if I choose to plant almonds, I'm locked in for the better part of a decade before I can recoup my investment. And yet, somehow, even in the middle of the longest running and most severe drought in California history, I read reports of farmers planting new almond trees, knowing full well that those trees are going to be sucking water for three to four years before they get even a single harvest. That's how confident these farmers are that the state of California is going bail them out with multi-billion dollar public works projects. And that's why I have no sympathy for them.

Planting almond trees now doesn't necessarily require confidence that the state is going to bail them out. Because almonds are a high-value crop, even significant increases in the price of water will not make them uneconomic to grow.

I think we agree that farmers should be paying more for water in any case. Alas, the Rube Goldberg-esque legal structure that's grown up around water rights since the 1800s makes this much harder to implement than it should be -- and that is the real problem.

Alfalfa isn't an annual though. It's a perennial.
I find really curious to tag almonds (we talk about Prunus dulcis, isn't?) as hungry-water crops. They are just the opposite. One of the ancient fruit trees that need less water to trive. They are famous because can survive and growth with just two deep watering episodes each twelve months. Even if you need to wait some years, you will not spend so many water in fact as with other crops.

Alfalfa on the other side needs to be watered constantly, day after day.

This is probably just another local war for the territory. When the best water containers (forests) are burned year after year by delinquents, millions of dollars in free water literally evaporate.