Basement Flooding Study Area 60 has experienced basement and recurring surface flooding during past extreme storm events. The study area is roughly bordered by Steeles Avenue, Ellesmere Road, Neilson Road, and Kennedy Road, along Highland Creek Milliken Branch.

The study will determine the contributing factors for surface and basement flooding in the area and recommend solutions to improve the City’s sewer system and overland drainage routes in order to mitigate flooding problems.

Based on investigations of drainage and flooding, the City has evaluated a number of alternative solutions and is recommending:

  • improving catch basin management
  • upsizing storm and sanitary sewers; and
  • upgrading storm sewer outfalls to Highland Creek Milliken Branch.

For more information on the recommended sewer improvements for the area, please view the Public Consultation tab below.

BF Study Area 60 - Agincourt along Highland Creek Milliken Branch
Study Area 60 roughly bordered by Steeles Ave, Ellesmere Road, Neilson Road to Kennedy Road.

During heavy rain, sewers can become overloaded with stormwater runoff. This puts pressure on the City’s sewer systems and overland drainage routes, such as roads, local rivers and streams, which can lead to basement flooding.

Recommended solutions to address flooding included:

  • Upsize sewers
  • Underground storage sewers
  • Catch basin management
  • Sewer outfall improvements (outlets to creeks)

The public had an opportunity to provide feedback on the study recommendations.


The study was carried out following the requirements for Schedule B projects under the Municipal Class Environmental Assessment (EA) process.

A Master Plan report was available for a 30-day review period from November 22 to December 21, 2023. See the Notice of Completion for details.

  • Executive Summary
  • Chapters 1-6 (includes Introduction, Study Overview, The Environmental Assessment Process, Existing Conditions, Data Collection and Field Survey, Assessment of Existing Conditions)
  • Chapter 7A (includes Development and Assessment of Alternatives)
  • Chapter 7B (includes Development and Assessment of Alternatives)
  • Chapters 8 and 9 (Recommended Solutions, Conclusions)