Elm Drive, Mississauga

Low impact development feature at Elm Drive in Mississauga

Icon - guidance, factsheets and schematics
Icon - news and eventsIcon - photos

This road right-of-way retrofit improves stormwater management through implementation of Low Impact Development (LID) practices in Cooksville Creek. The retrofit includes implementation of permeable parking laybys and sidewalks and a series of rain gardens (bioretention planter boxes) along Elm Drive in front of the Peel District School Board Adult Education Centre South. These rain gardens are located on school property yet treat urban runoff from the road to filter out pollutants so cleaner water enters Cooksville Creek and eventually Lake Ontario, our drinking water source. This project spans school and city property and resulted in a unique partnership among CVC, the City of Mississauga and the Peel District School Board. It provides municipalities an alternative option to reconstructing roads with conventional curb, gutter, and buried sewer and is more cost effective and better for the environment.

Innovative Clean Water Technologies

Rain Gardens
A series of rain gardens urban runoff is collected and treated in a series of rain gardens (bioretention planters) connected to each other by a perforated pipe. Runoff is piped from the adjacent permeable pavement catch basins.

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 Elm Drive filtering out pollutants through the engineered soil and some is piped to the rain gardens for cleaner water to enter our waterways.

Project Schedule


  • Construction is complete


  • To collect samples from 20 storm events before December 20, 2013

Monitoring Goals

Monitoring objectives for the Elm Drive LID site include:

  • Evaluate the performance of LID practices in reducing runoff volume, peak flows, pollutants, erosion, and restoring the natural water balance
  • Help determine maintenance requirements for optimal LID performance
  • Evaluate the degree to which LID reduces the impacts of extreme weather events due to climate change and builds resiliency in municipal infrastructure
  • Meet the objectives of CVC’s monitoring strategy report

Monitoring Progress

Since August 2011, for rain events up to 14 mm, no outflows have been observed leaving the LID infrastructure. In other words, roughly 56% of all rainfall events are being filtered and cleaned before entering Lake Ontario. Between August 2011 and September 2012 1.9 million litres of stormwater has been stored and infiltrated by the Elm Drive site. That is enough water to fill 1.3 Olympic sized swimming pools.

See the latest Monitoring Report for Elm Drive below for more information on Monitoring Progress.

Icon - guidance, factsheets and schematics

Elm Drive – Low Impact Development Infrastructure Performance and Risk Assessment
Elm Drive Monitoring Report – Fall 2013
Elm Drive Monitoring Report – August 2013
Elm Drive Monitoring Report – July 2013
Elm Drive Monitoring Report – June 2013
Elm Drive Case Study
Elm Drive Monitoring Report – May 2013
Elm Drive Monitoring Report – April 2013
Elm Drive Monitoring Report – March 2013
Elm Drive Monitoring Report – February 2013
Elm Drive Monitoring Report – December 2012/January 2013
Elm Drive Monitoring Report – November 2012
Elm Drive Factsheet

Icon - news and events

Clean Water Technology – Article in Construction Canada
Green Infrastructure Project Honoured With Award of Excellence at 11th Annual CEO Awards Gala

Icon - photos

Construction Progress
Elm Drive Site Tour – October 5, 2012
Interpretive Signage – This is a Rain Garden

Proud Partners

Partner logos - City of Mississauga, Peel District School Board

COVID-19 related service changes
Data and information released from Credit Valley Conservation (CVC) are provided on an 'AS IS' basis, without warranty of any kind, including without limitation the warranties of merchantability, fitness for a particular purpose and non-infringement.

Availability of this data and information does not constitute scientific publication. Data and/or information may contain errors or be incomplete. CVC and its employees make no representation or warranty, express or implied, including without limitation any warranties of merchantability or fitness for a particular purpose or warranties as to the identity or ownership of data or information, the quality, accuracy or completeness of data or information, or that the use of such data or information will not infringe any patent, intellectual property or proprietary rights of any party. CVC shall not be liable for any claim for any loss, harm, illness or other damage or injury arising from access to or use of data or information, including without limitation any direct, indirect, incidental, exemplary, special or consequential damages, even if advised of the possibility of such damages.

In accordance with scientific standards, appropriate acknowledgment of CVC should be made in any publications or other disclosures concerning data or information made available by CVC.