Utah State Water Research Laboratory

摘要

L.L. Anderson Dam impounds a 136,400-acre-foot reservoir in the headwaters of the Middle Fork of the American River in Placer County, California. The facility is part of the Middle Fork American River Development, which is operated by the Placer County Water Agency (PCWA) for water supply and hydroelectric generation. The rock channel spillway of L.L. Anderson Dam needs to be modified to pass the current, increased probable maximum flood (PMF), as routing the PMF indicates that the spillway does not have enough capacity and the dam would be overtopped by the flood. Hypothetical failure of L.L. Anderson Dam due to flood overtopping may adversely impact.