Thanks to a historically wet winter, Central Valley farmers south of the Sacramento-San Joaquin Delta got some long-awaited good news this week from federal water managers. For the first time in more than a decade, they will receive their full allotment of groundwater from the Central Valley Project. It’s a remarkable turnaround from last year, when farmers got only a 5 percent allotment, or even earlier this year, when they got 65 percent.