The Port Lands Flood Protection and Enabling Infrastructure Project (PLFP)
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The Port Lands Flood Protection and Enabling Infrastructure Project (PLFP) is an ongoing revitalization project in southeast Toronto, Canada.

The PLFP includes the construction of an over 1km long naturalized river valley that extends from the mouth of the Don River through a formal industrial area as part of a comprehensive plan to protect the city's downtown from flooding during a regulatory storm event and facilitate redevelopment of historically industrial area with new parklands.

The site's history, geology, and location created complications and challenges to the design and construction of the river valley. The site is a filled in floodplain within Lake Ontario originally intended for industrial use. The subsurface conditions of the site consist of uncontrolled fills overlaying thick deposit of highly organic soils that are compressible which are underlain by a thick layer of alluvial sand and silts. To protect the river valley and its ecological features from NAPLs and other contaminants, an environmental barrier system is integrated into the river valley. The barrier system and other features of the river valley require dry conditions for construction. Therefore, a cutoff wall up to 40m deep will be constructed around the around the entire river valley to protect the site from Lake Ontario. However, portions of the site did not require dry construction conditions. For those areas, environmental barriers and river finishes that could be constructed in the wet were designed. To address construction schedule challenges, the project will be executed in phases requiring a series of plug walls to be constructed. In the end when construction is complete, staged flooding will be required to protect environmental barrier and river valley from surge loading.

This presentation will provide a synopsis of the project background, design challenges, and constructability challenges encountered, and a discussion of the design strategy and engineered solutions developed to facilitate construction of the river valley.

Publication Summary

  • Geosyntec Authors: Panos Andonyadis
  • All Authors: Panos Andonyadis
  • Title: Canadian Geotechnical Society-Southern Ontario Section (CGS-SOS) Deep Foundation Workshop
  • Event or Publication: Event
  • Practice Areas: Geotechnical and Geological Analysis, Modeling, and Engineering
  • Citation: Panos Andonyadis, P.E. (Illinois) will present "The Port Lands Flood Protection and Enabling Infrastructure Project (PLFP)" at the Canadian Geotechnical Society-Southern Ontario Section (CGS-SOS) Deep Foundation Workshop at the Pearson Convention Center in Brampton, Ontario from 10:45- 11:30 a.m. on February 13, 2020.
  • Date: February 13, 2020
  • Location: Brampton, Ontario
  • Publication Type: Platform Presentation