Reexamination of the 2004 Failure of Big Bay Dam, Mississippi: Agenda
  • Introduction
    • Summarize overall Incident and Timeline
  • Key Learning Objectives
    • Expanded understanding of Potential Failure Modes (PFM’s), and how to identify and assess them
    • Expanded understanding of key factors that contribute to seepage failure mode development
  • Some Seepage Basics;
    • Internal Erosion (IE)Mechanisms
    • The IE/Piping Failure Mode Continuum: Initiation, Continuation, Progression, and Breach Formation
    • Factors Influencing IE and Piping Processes
    • Key Factors in Assessing Dam Safety Risks of IE/Piping
  • Design and Construction of Big Bay Dam
    • Examination of cross-section
    • Lack of critical design features that reduce risk of PFM development
    • Lack of monitoring
  • Distress Indicators;
    • Conduit cracks and leakage
    • Sinkhole(s)
    • Sediment filled outlet discharge basin
    • Changes in seepage outflow from toe drain system
  • Detailed failure development timeline
  • PFM description (building from the IE/Piping failure mode continuum)
  • Lessons learned
  • Summary and Conclusions
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