I am never against water conservation but I'm appalled by the idiots in Sacramento. These folks are elected to think for us what not one of them has thought of building supplementary reservoirs in the state so that instead of letting the water drain away into the ocean it could flow into supplementary reservoirs. The billions of gallons that were deliberately sent down the drain by the authorities was mindboggling.
Without water there is nothing.

California’s golden dam-building era ended decades ago, nearly all of the best sites are already taken. The best available places left only add 1% or 2% capacity.

"The best available places left only add 1% or 2% capacity."

What is the source for this claim?

As farm exports decrease with the new political environment, we would expect agricultural use of water to decline greatly, so usage in the near future may drop. The almond growers in the central valley will be one large user bases that should see declines.