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This innovative approach uses one or more deep (180 m) geothermal boreholes connected in a closed loop with a pond heat exchanger to cool outflows from stormwater ponds.  A metal or polyethylene heat exchanger is installed in an enclosure at the outlet of the pond.  A heat transfer fluid is pumped through the closed loop to maximize transfer of heat energy from the warm water to the much colder ground.  Warm outflows from the pond enter the enclosure and pass over the pond heat exchanger, which transfers energy from the water to the closed loop and into the ground. The approach was piloted by TRCA/STEP, in partnership with the City of Brampton, on a small pond in Brampton (Janssen and Van Seters, 2021<ref>Erik Janssen and Tim Van Seters. 2021. Geothermal-based Thermal Mitigation of Stormwater Retention Pond Outflows: Report Addendum. Sustainable Technologies Evaluation Program, Toronto and Region Conservation Authority, Vaughan, Ontario. https://sustainabletechnologies.ca/app/uploads/2022/03/Geo_Cooling_Report_2021.pdf</ref> and 2022<ref name="example1" />)  

This innovative approach uses one or more deep (180 m) geothermal boreholes connected in a closed loop with a pond heat exchanger to cool outflows from stormwater ponds.  A metal or polyethylene heat exchanger is installed in an enclosure at the outlet of the pond.  A heat transfer fluid is pumped through the closed loop to maximize transfer of heat energy from the warm water to the much colder ground.  Warm outflows from the pond enter the enclosure and pass over the pond heat exchanger, which transfers energy from the water to the closed loop and into the ground. The approach was piloted by TRCA/STEP, in partnership with the City of Brampton, on a small pond in Brampton (Janssen and Van Seters, 2021<ref>Erik Janssen and Tim Van Seters. 2021. Geothermal-based Thermal Mitigation of Stormwater Retention Pond Outflows: Report Addendum. Sustainable Technologies Evaluation Program, Toronto and Region Conservation Authority, Vaughan, Ontario. https://sustainabletechnologies.ca/app/uploads/2022/03/Geo_Cooling_Report_2021.pdf</ref> and 2022<ref name="example1" />)  

{{textbox|As part of the initiative an online sizing tool for geothermal systems was develop - you can view it by click the button below:

{{textbox|As part of the initiative an online sizing tool for geothermal systems was developed - you can view it by click the button below:

{{Clickable button|[[File:Sizing calculator.PNG|370 px|link=http://geothermal-thermal-mitigation2.herokuapp.com/simplecalc]]}}}}

{{Clickable button|[[File:Sizing calculator.PNG|370 px|link=http://geothermal-thermal-mitigation2.herokuapp.com/simplecalc]]}}}}