Farmers in a vast agricultural region of California will receive a significantly greater amount of irrigation water this summer compared to past drought years — but not their full supply, federal officials announced Wednesday. Record winter rain and snow in some parts of California have put a major dent in the five-year drought, boosting reservoirs with irrigation water for use during hot, dry months. Farmers in the San Joaquin Valley will receive 65 percent of what they expect from a federal system of reservoirs and canals, U.S. Bureau of Reclamation officials said.