Sixty years ago, California voters approved Gov. Pat Brown’s plan for a 700-mile system of dams, water pumps and aqueducts to control flooding in Northern California and send water south to Los Angeles and San Diego. His son, Jerry, spent the better part of four terms as governor trying to expand his father’s work. On Tuesday, Gov. Gavin Newsom effectively capped the Browns’ multi-generation effort, known as the State Water Project, the source of about a third of Southern California’s drinking water.