Reuters: The main irrigation system for California farmers, the Central Valley Project, expects to halt water deliveries to most of its growers this year due to one of the worst droughts in state history, federal managers said on Friday. The zero-water allocation for most CVP users was declared by the U.S. Bureau of Reclamation as California water officials repeated their plans to cut amounts supplied from a separate state-run water project to 15 percent of normal allotments. The …