Not in CA, but where I live there is continuous work on covering canals. A lot of canals were dug a century or more ago and are just ditches, something like 60

Not in CA, but where I live there is continuous work on covering canals. A lot of canals were dug a century or more ago and are just ditches, something like 60% of water is lost to evaporation and seepage. The issue is still the cost, the price of water delivery is not generating the revenue to do it all at once. If they can also do solar, they can recoup those costs faster.