California’s historic five-year drought is officially over, washed away with the relentlessly drenching rains, floods and snowstorms of this winter. But just as tougher building codes and better emergency planning follow major earthquakes, the brutally dry years from 2012 to 2016 are already leaving a legacy, experts say, changing the way Californians use water for generations to come. “There’s no question that we’ll be better prepared for the next drought because of the lessons learned in this one,” said Felicia Marcus, chairwoman of the State Water Resources Control Board in Sacramento. “This was the wake-up call of the century.”