A study is underway to determine the contributing factors for surface and basement flooding in the City of Toronto and recommend 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.
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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. Figure 2.20 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 Hwy 401 to the north, St Clair Ave. W. to the south, Allen Rd. to the west, and Bayview Ave. 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.