2018 Update

A study is 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 37 location in the Cedarvale 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:

One Schedule B and one Schedule C projects including:

  • New and larger storm, sanitary and combined sewers, including some redirection of storm drainage from the combined sewer and abandonment of existing pipes in easements
  • Removal of undersized storm detention pipes
  • New storm detention pipes and a combined sewage storage tank underground in Cedarvale Park
  • Catchbasin control measures: inlet control devices and high capacity inlets

The study was carried out following the requirements for Master Plan under the Municipal Class EA process. The Master Plan report has been placed on public record for a 30- day review period starting November 15, 2018 and ending December 17, 2018. The Executive Summary is available below or the full report at:

Dufferin-St Clair Library

1625 Dufferin Street (south of St Clair Avenue West), 416-393-7712.

BF Area 37 map

Study Area 37 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 37 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 37 is located mainly in Ward 21 and in portions of Wards 15 and 17.  It is roughly bounded by Wingold Avenue to the north, St. Clair Avenue West to the south, Dufferin Street to the west, and Bathurst Street 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. As per the engineering practice at the time, there were no specific guidelines applied on the design of the major system (overland flow) drainage.

The City hosted a drop-in event in May for residents to review, discuss and seek feedback on the recommended solutions for reducing the risk of basement and surface flooding and improving stormwater runoff quality in the study area.

Thursday, May 3, 2018

St Michael’s College School – Centre for the Arts

Sports Building, Alumni Lounge

1515 Bathurst Street (north of St Clair Ave West)

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.