It's been called the third rail of California politics -- fraught with even more peril than Prop 13 -- and the most controversial proposal in the contentious history of California water. We're talking, of course, about the Bay Delta Conservation Plan and its proposed centerpiece: a massive conveyance system to move millions of acre feet of water annually south out of the Sacramento River and around the ecologically fragile San Joaquin-Sacramento River Delta. Proponents say that the project is essential for addressing risks of levee failure, reducing conflicts over fish, and ensuring reliabl