COMPREHENSIVE SPILLWAY TAINTER GATE ASSESSMENT AND IDENTIFICATION OF INTERIM RISK REDUCTION MEASURES

摘要

The US Army Corps of Engineers (USACE) Portland District, CENWP, has 90 spillwayTainter gates. There are 42 gates at Projects in the Willamette Valley, 5 at Projects in theRogue Basin, and 43 at Projects on the Columbia River. Since 2001 there have beenvarious studies, inspections, and incidents that have prompted the Portland District tobecome concerned about the structural integrity and mechanical and electrical reliabilityof these gates. Buckling of tainter gate strut arms at three of the four tainter gates atFoster Dam in 2008 led to emergency tainter gate repairs. Observations of buckledtainter gate strut arms at Dexter Dam in December 2009 created urgency with respect todocumenting the risk to the downstream population. In 2010, the district performed acomprehensive assessment of the tainter gates in the Willamette Valley and Rogue Basinprojects. The comprehensive assessment included a gates specific potential failure modesanalysis (PFMA), structural, mechanical and electrical assessments, identification ofinterim reduction measures and analysis of impacts of the interim reduction measures.As part of this assessment, the District developed a tool for prioritizing projects for gaterepair based on the results of the assessment.