Seepage Through Earth Dams: Agenda

*All times listed are eastern time. 

April 20, 2021

  • 11:00 am – 11:20 am Introduction
  • 11:20 am – 1:00 pm Seepage and Embankment Dams
    • Cite dam failure statistics highlighting prominence of seepage incidents and failures for embankment dams
    • Review seepage failure modes with graphic illustrations
    • Illustration of failure modes with photographs and information from failures and incidents
    • Select case histories
  • 1:00 pm – 1:30 pm Break
  • 1:30 pm – 2:45 pm Permeability and Erodibility 
    • Definition of coefficient of permeability (hydraulic conductivity)
    • Estimating coefficient of permeability
      • Published tables – by soil type and gradation
      • Empirical equations 
      • Heterogeneity and Anisotropy
      • Anisotropy of layered system
      • Anisotropy ratios of different materials (published tables)
      • Effects of fines on coefficient of permeability
      • Effects of clay type on coefficient of permeability
      • Effects of angularity and density
      • Coefficient of permeability tests
    • Erodibility characteristics of soils
  • 2:45 pm – 3:15 pm Exercise No. 1
  • 3:15 pm –  3:45 pm Break
  • 3:45 pm – 4:00 pm Exercise No. 1 Solution and Review
  • 4:00 pm – 4:45 pm Seepage Analysis – Part I
    • Types of flow
    • Governing equations
      • Darcy’s law
      • Continuity (LaPlace) equation
    • Flow nets
    • Applications of Flow Nets 
    • Flow net illustrations
  • 4:45 pm – 5:00 pm Q&A

April 21, 2021

  • 11:00 am – 12:00 pm Seepage Analysis – Part II
    • Numerical analysis
    • Practical applications of seepage analyses
  • 12:00 pm – 12:40 pm Heave, Blowout, and Critical Gradients 
  • 12:40 pm – 1:10 pm Exercise No. 2 – Seepage Analysis
  • 1:10 pm – 1:40 pm Break
  • 1:40 pm – 1:55 pm Exercise No. 2 – Solution and Review
  • 1:55 pm – 3:10 pm Seepage Control Methods – Part I
    • Seepage collection
      • Objectives
      • Considerations
      • Collection and control tools
    • Filters 
    • Drains 
    • Remediation configurations with illustrations
  • 3:10 pm – 3:40 pm Break
  • 3:40 pm – 5:00 pm Seepage Control Design – Filters and Drains
    • Filter design
    • Foster and Fell (2001)
    • Design and Construction practices 
    • Geotextiles

April 22, 2021

  • 11:00 am – 12:15 pm Seepage Control Methods – Part II
    • Seepage reduction/cutoff
      • Objectives
      • Considerations
      • Seepage reduction/cutoff tools
      • Remediation configurations with illustrations
  • 12:15 pm – 12:45 pm Exercise No. 3 – Filter Design 
  • 12:45 pm – 1:15 pm Break
  • 1:15 pm – 1:30 pm Exercise No. 3 – Filter Design Solution and Review 
  • 1:30 pm – 3:00 pm Seepage Detection and Monitoring
    • Visual Surveillance
    • Weirs and Flumes
    • Piezometers
    • Toe drain flow meters
    • Water property measurements (turbidity, chemical and temperature)
    • Emergency Response
  • 3:00 pm – 3:30 pm Break
  • 3:30 pm – 4:15 pm Case Studies and Examples – Part 1
    • Collection and control
      • Washakie Dam
      • New Creek Dam
    • Seepage reduction and cutoff
      • Wolf Creek Dam
      • Guanella Dam
  • 4:15 pm – 4:45 pm Case Studies and Examples – Part 2
    • AV Watkins Dam
  • 4:45 pm – 5:00 pm Course Wrap-Up and Final Questions

April 23, 2021

  • 11:00 am – 1:00 pm Optional Computing Session – Hands-On Session Working with 2D SEEP/W to Analyze Embankment Examples
    • 2D SEEP/W Operational Fundamentals
    • Step through Model Setup and Results of Example Problem(s)
    • Example Projects Using SEEP/W
  • 1:00 pm – 2:00 pm Optional Computing Session – Introduction to Working with 3D FEFLOW to Analyze Embankment Examples
    • 3D FEFLOW Operational Fundamentals and Capabilities
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