Stormwater Servicing Master Plan for Regional Roads

The Region of Peel has initiated an infrastructure planning initiative to develop a Stormwater Servicing Master Plan for Regional Road infrastructure.

1. To develop a comprehensive stormwater servicing strategy that considers the impacts of growth and climate change;
2. To develop tools to help assess and evaluate the system for existing, future, and climate change impacts;
3. To identify the expectations of stakeholders and community by establishing measurable levels of service;
4. To develop an optimal implementation plan that identifies the cost and timing for work to be undertaken to achieve the preferred strategy, and;
5. To inform future capital programs with respect to funding source including renewal and growth related projects.

This project will focus on the stormwater infrastructure located within the Regional road right-of-way as highlighted in green on the map on the right.

Provide your input! After reviewing the PIC materials, navigate to the 'Provide Feedback' section or  click here  to submit your comments. The comment form will be available from February 17 to March 10, 2022.

The Stormwater Servicing Master Plan for Regional Roads is based only on Regionally owned and managed stormwater infrastructure.

• The Region's Long Range Transportation Plan (LRTP) identifies strategies to service future growth to 2041 and is in the process of being updated to identify strategies to 2051
• The Stormwater Servicing Master Plan will be updated in tandem with the LRTP (every 5 years), as stormwater planning and projects are tied to transportation planning and projects
• The Regional storm sewers are designed and built to manage stormwater coming from the right-of-way (roads) only
• The Region's preference prevents connections from private property to Regional storm sewers unless no other outlet is available (Town/City or Conservation Authority managed outlet)

The Master Plan has addressed:

• How to mitigate future stormwater flows due to increased paved surfaces, in alignment with the Long Range Transportation Plan (LRTP) projects
• The impacts of climate change on stormwater management
• Aligning existing programs, such as storm sewer renewal and maintenance, with known storm sewer capacity concerns
• Creating tools, such as a hydraulic computer simulation model, to predict existing capacity and determine upgrades required for growth in the Region

The study will support existing and future growth-related decision making

• Stormwater infrastructure in the Region of Peel is a two-tiered system
• The Region owns and maintains 26 Regional Roads and all stormwater infrastructure within them
• The Town of Caledon, City of Brampton and City of Mississauga are responsible for local stormwater systems
• The impacts of climate change will be considered throughout the study
• Align study output with the Region's Long Range Transportation Plan (LRTP) projects to determine projects which are driven by growth within the Regional right-of-way

For additional information, watch the video to learn more about the following:

• What is Stormwater? How can it affect you?
• What is the lower-tier municipality vs. Region's role in stormwater management?
• What are some solutions that deal with stormwater infrastructure that is aging and/or at-capacity?

A key consideration in the preparation for the Stormwater Servicing Master Plan was determining the impacts of climate change on the storm sewer system.

The Region of Peel's Public Works Stormwater Design Criteria and Procedural Manual was updated in 2019 and used to support the Master Plan in determining the impacts of climate change. The updates to the Procedure Manual:

• Included the updating of the Region's design storm event to account for climate change
• Were reviewed and used as an input into the Master Plan analysis

Below is a link to the Region of Peel's Public Works Stormwater Design Criteria and Procedural Manual (2019):

Through the Stormwater Servicing Master Plan for Regional Roads:

• A new hydraulic computer simulation model was created to mimic the Region's existing storm sewer system
• Climate change-adjusted storm events were used in the analysis to ensure that the recommended strategies increase resiliency to climate change
• Climate change considerations are aligned with the policy direction included in the Peel 2051 Regional Official Plan, the Municipal Comprehensive Review, and O.Reg. 588/17

Provide your input! After reviewing the PIC materials, navigate to the 'Provide Feedback' section or  click here  to submit your comments. The comment form will be available from February 17 to March 10, 2022.

Infrastructure that mimics natural processes that result in the infiltration, evapotranspiration, or use of stormwater in order to protect water quality and aquatic habitat.

Low Impact Developments can:

• Clean stormwater from within the right-of-way before it enters the natural environment (streams, lakes, or ponds)
• Help regulate stormwater flows to prevent flooding
• Infiltrate stormwater into the ground, maintaining the natural water balance

Examples of Low Impact Developments include:

• Infiltration trenches/chambers
• Bio-swales
• Bioretention facilities
• Enhanced grass swales
• Cooling Trench

A hydraulic computer simulation model was created to assess capacity in the storm sewers.

The analysis:

• Included all the Region owned storm sewers
• Accounted for the local road storm sewers where connecting to the Regional storm sewers
• Identified storm sewers not meeting the Region's design criteria (1-in-10 year rainfall)
• Considered the impacts of the climate change event scenario
• Identified storm sewers with extra capacity that could be used to service growth

Alternatives that were evaluated to address storm sewers with capacity issues included:

1. Do nothing
2. Pipe replacement and upsize
3. Stormwater diversion
4. Implementation of Low Impact Development (LID)

Provide your input! After reviewing the PIC materials, navigate to the 'Provide Feedback' section or  click here  to submit your comments. The comment form will be available from February 17 to March 10, 2022.

A system-wide analysis was completed to identify the best locations for LID stormwater servicing strategies. For the preferred locations, the following alternatives were reviewed following the MCEA multiple-bottom-line evaluation process:

1. Do nothing
2. Implement stormwater management (SWM) pond
3. Infiltration trench/cistern
4. Bioretention facility
5. Bioswales
6. Perforated pipe/exfiltration system
7. Permeable paving
8. Superpipe storage
9. Enhanced grass swales
10. Proprietary SWM devices

A system wide evaluation process determined 17 locations where LID stormwater management strategies would be practical. Of these 17 locations, 9 were short-listed as the most favourable sites to implement LID strategies. The short-listed sites were determined by ranking highest in the following criteria:

• Infiltration potential
• Pipe capacity and condition
• Surrounding road projects (i.e. road resurfacing, capital projects, sustainable transportation projects)
• Whether or not there are existing quality treatments
• Planned water and/or wastewater system projects
• Proposed studies
• Environmental sensitivities

Provide your input! After reviewing the PIC materials, navigate to the 'Provide Feedback' section or  click here  to submit your comments. The comment form will be available from February 17 to March 10, 2022.