Here's the report from the Pacific Institute calling for more conservation from California farmers. It's a strong argument, but having spent some time with Central Valley farmers over the last month filming for the documentary - they're not going to go for it. The Ag folks I've talked to say they've already spent lots of time and money making their irrigation systems as efficient as possible and they can't do much more.
As with all the arguments related to the Delta there is truth on all sides
