2019 Update

A study has been completed to determine the contributing factors for surface and basement flooding in the City of Toronto and recommended solutions to improve the City’s sewer system and overland drainage routes in order to mitigate flooding problems.

Study Area 40 location in Yonge-Eglinton area has experienced recurring basement and surface flooding during extreme storms in the past.

Following consultation with agencies, City Divisions and the public, the following are the study’s key findings, accepted by the City:

35 Schedule A+ and 1 Schedule B projects including:

  • New and larger storm and sanitary sewers
  • Sections of large diameter storm and sanitary sewers to provide storage during heavy rainfall events
  • Catchbasin control installation: inlet control device and high capacity inlets


BF Area 40 Executive Summary 

Public Drop-In Event #2 Documents

To request assistance reading these files, please email or call Mae Lee at Mae.Lee@toronto.ca or 416-392-8210.

55 John Street, Metro Hall, Toronto Ontario, M5V 3C6

small size BF Area 40_PIC 2 boards

2018 PIC 2 general info boards

BF 40 PIC 2 Comment Sheet

Map of study area 40, please contact Mae.Lee@toronto.ca if you would like further details
Map of Study Area 40

Study Area 40 was established in central Toronto in 2013 due to severe flooding reported during the severe rainstorm of July 8, 2013. Historic records show that this area has experienced basement flooding under severe storm events for several years. The study area map shows previously reported basement flooding incidents in Area 40 for the severe rainstorms that occurred on May 12, 2000, August 19, 2005, July 31, 2012, May 28, 2013, and July 8, 2013.

Study Area 40 is located mainly in Wards 16 and 22, and in portions of Wards 15 and 25. It is roughly bounded by Highway 401 to the north, St Clair Avenue West to the south, Allen Road to the west, and Bayview Avenue to the east. It is serviced by a combined sewer system, and as well, separate storm and sanitary sewer systems. The storm sewer system in the Study Area was originally designed to convey a 2 to 5 year design storm and, as per the engineering practice at the time, there were no specific guidelines applied on the design of the major system (overland flow) drainage.

Drop-in event was held on July 24, 2018 at St Peter’s Lutheran Church to review, discuss and seek  your feedback on the recommended solutions for reducing the risk of basement and surface flooding and improving stormwater run-off quality in the study area.

What is a Class Environmental Assessment?

Ontario’s Environmental Assessment (EA) program promotes good environmental planning by determining and managing the potential effects of a project prior to implementation.

The EA program ensures that public concerns are heard. EA balances economic, social, cultural and natural environmental needs so that projects benefit Ontario.

This study is being carried out according to the Municipal Class Environmental Assessment process. This is an approved approach to satisfying requirements of the Environmental Assessment Act specifically tailored to municipal infrastructure. The process includes identifying the problem or opportunity to be addressed, developing and evaluating a range of alternative solutions, providing opportunities for public input and identifying a preferred solution.