“Long-term and systemic failures” by California dam managers and regulators to recognize inherent construction and design flaws at the tallest U.S. dam caused last year’s near-disaster there, an independent panel of dam safety experts said Friday, calling it a wake-up call for dam operators around the country. Members of the Association of State Dam Safety Officials and the U.S. Society on Dams carried out an independent investigation into the human and technical problems that caused the crisis at California’s Oroville Dam. The experts issued their report Friday.