Members of the San Diego County Water Authority met behind closed doors more than 100 times last year — four times as often as they met in public. State law limits the scope and frequency of such unnoticed, unrecorded meetings so as to prevent officials from hiding their activities from the public, which pays for them. Yet payroll documents, the only records available to describe the get-togethers, show three groups of authority board members met behind closed doors on a monthly basis in 2016.