Portico Community Church, Mississauga

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Portico is both a community church and a leader in sustainability as reflected by the LID stormwater management practices in their parking lot. In 2009, Portico Church demonstrated their dedication to environmental stewardship by constructing one of the first green parking lots in the Credit Valley Watershed. Rain water and runoff is collected and treated within the 5 acre parking lot through a rain garden and bioswale-permeable pavement system that filter out pollutants and release cleaner water to the Credit River. The LID design captures 90% of all storm events that occur in a typical rain year. CVC has partnered with Portico Church to enhance and monitor the LID practices.

Innovative Clean Water Technologies

Illustration of rain garden
Rain Garden (Bioretention Cell)

An innovative garden collects rain water and urban runoff from the parking lot that enters the garden through curb openings. The plants and engineered soil work to filter out pollutants from rain water runoff so cleaner water flows into the Credit River and eventually into Lake Ontario, our drinking water source.


Illustration of permeable pavement
Permeable Pavement

Specially designed paver stones with spacing bars that create gaps or joints between the stones, laid on top of engineered soil. Permeable pavement collects urban runoff from the surface filtering out pollutants through the engineered soil for cleaner water to enter our waterways.




Landscaped grasses and engineered soil collect and release rain water and parking lot runoff slowly while filtering out pollutants.


Project Schedule


The parking lot construction including the bioswale-permeable pavement system was completed in 2009, while the rain garden was added to the parking lot island in 2011.


Monitoring with water level loggers began in June of 2012.

Monitoring Goals

  • Evaluating the movement of water of the LID practices through the use of rainfall data in combination with water level loggers or outlet flow loggers.
  • Quantifying establishment and ongoing maintenance requirements for the bioswale and permeable pavement system with varying design features and drainage areas (area that rainfall drains into system).
  • Evaluating the success of plant species used within the practice based on health, maintenance and urban aesthetic standards.
  • Testing and developing protocols to ensure the contractor has properly constructed the innovative landscaped stormwater practices as designed before taking ownership and paying. This includes post-construction surveys, soil testing, plant surveys, and post-construction inspections.

Monitoring Progress

  • Landscaping – In September 2012, a landscape designer and contractor implemented a new design that includes large groupings or drifts of colourful plant species that provide year round interest.
  • Maintenance – CVC and Church volunteers perform regular maintenance.
  • Water Levels – The location of the observation well and monitoring equipment has been moved to provide more representative results, this data collection began on Oct 11 2012.

See the latest Monitoring Report for Portico Community Church below for more information on Monitoring Progress.

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Portico Community Church Monitoring Report – Fall 2013
Portico Community Church Monitoring Report – August 2013
Portico Community Church Monitoring Report – July 2013 

Portico Community Church Monitoring Report – June 2013

Portico Community Church Monitoring Report – May 2013

Portico Community Church Monitoring Report – April 2013

Portico Community Church Monitoring Report – March 2013

Portico Community Church Monitoring Report – February 2013

Portico Community Church Monitoring Report – December 2012/January 2013

Portico Community Church Monitoring Report – November 2012

Portico Community Church Factsheet

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Event – First planting of rain garden with CYC Youth and Portico Church volunteers – June 2011

Event – LID Professionals tour Portico Church LID practices – October 5, 2012

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Portico Community Church – Post-Construction

Interpretive Signage – This is a Bioswale

Interpretive Signage – This is a Rain Garden

Proud Partners

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