REPORT:
Sedimentology, Behavior, and Hazards of Debris Flows at Mount Rainier, Washington

Table of Contents

• Abstract
• Introduction
  • Acknowledgments
• Types of flows at Mount Rainier
  • General statement
  • Cohesive debris flows (more than 3 to 5 percent clay)
  • Noncohesive debris flows (less than 3 to 5 percent clay)
  • Hyperconcentrated flows
• Flow magnitude and frequency
  • Methods of study
  • Flows of high magnitude and low frequency (500 to 1,000 years)
    • Greenwater Lahar and Osceola Mudflow
    • Paradise Lahar
    • Round Pass Mudflow (branch on Tahoma Creek)
    • Round Pass Mudflow (branch on Puyallup River)
    • Unnamed pre-Electron deposits, Puyallup River System
    • 1,000-year-old lahar
    • Electron Mudflow
    • Other lahars and possible lahars
    • Synthesis of record of large, low-frequency lahars
  • Flows of intermediate magnitude and frequency (100 to 500 years)
    • White River System
    • Cowlitz River System
    • Nisqually River System
    • Puyallup River System
    • Carbon River System
  • Flows of low magnitude and high frequency (less than 100 years)
    • Recurrence interval of small debris flows
    • Seasonal distribution
    • Flow texture and formative transformations
    • Flow dynamics and transformations
  • Debris avalanches and the Tahoma Lahar
  • Historical floods compared with debris flows
  • Summary of flow origins and transformations
• Risk analysis
  • Flow frequency and rist at Mount Rainier
  • Debris flows and summit-cone volcanism
• Design or planning cases and hazard zonation
  • Definition of cases
  • Measurements and estimates of flow dynamics
  • Maximum lahar
  • Design or planning case I
  • Design or planning case II
  • Design or planning case III
  • Hazard zonation
    • Zone I
    • Zone II
    • Zone III
  • Lateral erosion associated with hazard zone III
• Probability of precursor volcanic activity
• Travel times of lahars and potential reservoir effects
  • Travel times of lahars
  • Reservoir effects
    • White River
    • Cowlitz River
    • Nisqually River
• Conclusions
• References Cited

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