Water regulators in California on Wednesday extended what are now largely symbolic conservation measures lingering from the drought after the state has seen one of the wettest winters in years. Regulators decided to retain the measures at least until spring as a precaution against the possible return of dry weather — even as another major storm bears down on the state. “I don’t think there’s just one way to go,” Felicia Marcus, chairwoman of the State Water Resources Control Board, said after several local water districts urged members to lift the regulations.