Citing a “long-term systemic failure” at the California Department of Water Resources, independent forensic investigators released their final report Friday on the nearly-catastrophic emergency last February at Oroville Dam. In a 584-page dissection of the disaster at America’s tallest dam, the investigative team said Oroville Dam was designed and built with flaws from the beginning, which were exacerbated by inadequate repairs in the years that followed.