In class: Underground Infiltration Practices: Understanding Exfiltration – Cambridge, ON

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November 12, 2019 @ 8:30 am – 4:30 pm America/Toronto Timezone
Grand River CA Head Office - Auditorium
Clyde Rd
Cambridge, ON
Victoria Kring
Registration now closed. Please email Victoria Kring at if you would like to be added to our waiting list.
Onsite check-in: 8:30 – 9:00 am.

Water quality improvements for most infiltration practices come largely from the runoff reduction. So understanding and optimizing the exfiltration capacity is key to designing and modeling a highly performing installation.  We will study the basic components of reservoir routing, so often hidden by our modeling software. By applying systems thinking to our infiltration practice, we will consider alternatives to optimize designs and begin to understand the implications of our decisions. Maybe you have some of these questions?

  • For a given storage volume, is a deep practice better than a shallow one?
  • Are there benefits to designing narrow practices rather than broader areal practices?
  • Is the exfiltration to native soil significant during a design storm duration?
  • How can I model the drawdown time of a practice for design or review?
  • Is the exfiltration from a stormwater practice likely to cause mounding of the local water table?
    • How might this affect the permissible groundwater separation?
    • How might this affect recommended setbacks?
  • How can unacceptable mounding be mitigated in practice design?

Learning Objectives:

Upon completion of the course participants will be able to:

  1. Determine if, for a given storage volume, a deep practice would be more effective than a shallow one.
  2. Articulate (and calculate) the benefits of designing narrow practices rather than broader areal practices.
  3. Evaluate if the exfiltration to native soil is significant during a design storm duration.
  4. Model the drawdown time of a practice for design or review.
  5. Assess the impact of exfiltration from a stormwater practice on the local water table.
  6. Develop mitigation measures for unacceptable groundwater mounding.

Who should attend:

  • Professionals involved in designing or reviewing infiltration practices
  • Engineers developing their knowledge in hydrogeology
  • Hydrogeologists increasing their understanding of design for stormwater management
  • People interested in algebraic modeling

Recommended pre-workshop study: Design Infiltration Rate E-learning Course (FREE)


Jen Hill and Graeme MacDonald

Additional Information:

As this is a technical workshop involving the application and discussion of different computational models, participants are encouraged to bring their own laptop computer.

Lunch will be provided.

If you have any additional questions or concerns please contact Victoria Kring at

Association ‘discount codes’ are not eligible for this course.

This training event was produced through the Climate Change Adaptation Platform, with support from Natural Resources Canada.

TRCA HST Registration number is 10808 8584 RT001

Registration Now Closed