Webinar: Ground Source Cooling of Stormwater Pond Outflows: New Research on a Cost and Space Efficient Method to Mitigate the Thermal Impacts of Stormwater Ponds on Aquatic Life

June 18, 2020 @ 12:00 pm – 1:00 pm
Online Webinar
$15 - $30
Mike Bortolussi

This webinar will review performance results from over 45 thermal mitigation projects in Ontario and presents data on two new techniques recently installed and monitored in Brampton, Ontario.

This webinar is being offered as part of the TRIECA 2020 Webinar Series.  

To View and Register for the “Entire” Webinar Series – Click Here

Additional registration options include:

  • Register for this webinar only – click “Register Online” button below.
  • To register for multiple webinars or to add e-learning and/or in-class training events to your purchase click on the  “+ Add to Booking” button during checkout.

To learn more about the TRIECA Annual Conference visit www.trieca.com.

Presentation Overview:

Water temperature is a critical component of stream health, as it regulates both biotic and abiotic processes in streams. It can be both the driving and constraining factor for the survival of aquatic organisms. When runoff is drained through stormwater wet ponds, solar radiation heats the open pond water, resulting in thermally enriched outflows that exceed tolerance thresholds of aquatic organisms adapted to cooler water. Several measures have been devised to help mitigate temperatures and thermal loads from stormwater ponds. These include:

  • Subsurface draw outlets
  • Cooling trenches
  • Night-time release outlets
  • Low impact development techniques

This presentation reviews performance results from over 45 thermal mitigation projects in Ontario and presents data on two new techniques recently installed and monitored in the City of Brampton.  One of these helps cool pond outflows through borehole geo-exchange, while the other utilizes a surface cover to prevent solar heating of pond water.  The relative advantages and disadvantages of the different approaches are discussed, and recommendations are provided on the design and application of the measures under different site conditions.

Learning Objectives:

  • Learn about the problem of stormwater thermal enrichment in streams and the various mitigation measures that have been implemented in northern climates.
  • Understand how the mitigation measures implemented in Ontario have performed, and how these should be designed to optimize effectiveness.
  • Learn about the application and effectiveness of two new thermal mitigation measures piloted in the City of Brampton in 2018, and how these may be utilized to mitigate thermal impacts from stormwater ponds.


Tim Van Seters, Toronto and Region Conservation Authority (TRCA)

Learn More About Thermal Mitigation:

To learn more about Thermal Mitigation and research projects conducted by STEP, please click here

Additional information:

IECA and Landscape Ontario members are eligible for discounts. To register at this discounted price, please contact Victoria Kring at Victoria.Kring@trca.ca and provide your member ID for membership confirmation.

Are you viewing this webinar with a group? You can add additional viewing attendees to your order, provided you are all viewing in the same location. Additional attendees qualify for a reduced registration fee of only $15 per person!

If you have any additional questions, please contact Victoria Kring at Victoria.Kring@trca.ca

Register Online