Seepage Through Earthen Dams: Agenda

May 21, 2019

8:00 - 8:30 Introduction

8:30 – 10:00 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
    • Backward erosion piping
    • Concentrated Leakage
  • Illustration of failure modes with photographs and information from failures and incidents

10:00 – 10:15 Morning Break

10:15 – 11:15 Permeability (Hydraulic Conductivity)

  • 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

11:15 – 12:00 Exercise No. 1

12:00 – 1:00 Lunch

1:00 – 1:15 Exercise No. 1 Solution and Review

1:15 – 2:30 Seepage Analysis – Part I

  • Types of flow
  • Governing equations
    • Darcy’s law
    • Continuity (LaPlace) equation
  • Flow nets
  • Applications of Flow Nets
  • Flow net illustrations

2:30 – 2:45 Afternoon Break

2:45 – 3:15 Seepage Analysis – Part II

  • Numerical analysis
  • Practical applications of seepage analyses

3:15 – 3:45 Heave, Blowout, and Critical Gradients

3:45 – 4:45 Exercise No. 2 – Seepage Analysis

4:45 – 5:00 Exercise No. 2 – Solution and Review

 

May 22, 2019

8:00 – 9:30, Seepage Control Methods – Part I

  • Seepage collection
    • Objectives
    • Considerations
    • Collection and control tools
  • Remediation configurations with illustrations
  • Filters
  • Drains
  • Filter design

9:30 – 9:45 Morning Break

9:45 – 10:45 Seepage Control Design – Filters and Drains

  • Explanation of internal erosion and piping
  • Foster and Fell (2001)
  • Industry practice
  • Geotextiles

10:45 – 11:30 Exercise No. 3 – Filter Design

11:30 – 12:30 Lunch

12:30 – 12:45 Exercise No. 3 – Filter Design Solution and Review

12:45 – 1:45 Seepage Control Methods – Part II

  • Seepage reduction/cutoff
    • Objectives
    • Considerations
    • Seepage reduction/cutoff tools
    • Remediation configurations with illustrations

1:45 – 2:45 Seepage Detection and Monitoring

  • Visual Surveilance
  • Weirs and Flumes
  • Piezometers
  • Toe drain flow meters
  • Water property measurements (turbidity, chemical and temperature)

2:45 – 3:00 Afternoon Break

3:00 – 4:00 Case Studies and Examples

  • Collection and control
    • Washakie Dam
    • New Creek Dam
  • Seepage reduction and cutoff
    • Wolf Creek Dam
    • Guanella Dam

4:00 – 4:30 Exercise No. 4 – Seepage Remediation Design

4:30 – 5:00 Exercise No. 4 - Review Actual Remediation

5:00 – 5:15 Course Wrap-Up and Final Questions

5:15 – 5:30 Quiz

 

May 23, 2019

8:00 – 12:00 Optional Computing Session – Hands-On Session Working with SEEP/W to Analyze Embankment Examples

  • SEEP/W Operational Fundamentals
  • Example Problem(s)
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