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Hydrology & Surface Water - Lower Don Bridge and Don Yard

← Return to Early Works: Lower Don Bridge and Don Yard Draft Report

Key Findings

  • The Lower Don Bridge and Don Yard early works study area is partly located within the Toronto and Region Conservation Authority’s (TRCA) regulated area and the Don River floodplain.
  • West Don Lands Flood Protection Landform, located in the study area, is a flood protection landform that was constructed in 2012 to reduce the risk of flooding to the West Don Lands neighbourhood.
  • Detailed floodplain impact assessment will be conducted as design and planning progress, in consultation with TRCA, Waterfront Toronto and City of Toronto.

Potential Effects & Mitigation Measures

Potential Effects:

  • Potential impact on flooding conditions in the Don River floodplain.
  • Potential flooding impacts on site during construction.
  • Potential change in stormwater quantity and quality due to potential erosion of exposed soil and increased sediment loading which may impact receiving water bodies and/or municipal stormwater drainage system.

Don River Floodplain in the Lower Don Bridge and Don Yard Early Works Hydrology & Surface Water Study Area

Don River Floodplain in the Lower Don Bridge and Don Yard Early Works Hydrology & Surface Water Study Area

Mitigation Measures:

  • Floodplain impact assessment will be conducted as planning progresses following Toronto and Region Conservation Authority (TRCA) guidelines once details on the bridge abutment configuration and other design information are available.
  • Develop a flood contingency plan with specific measures for any proposed work or temporary laydown and staging areas in the Don River floodplain, as project planning progresses.
  • Develop the overall stormwater quality and quantity control strategy in accordance with all relevant municipal, provincial, and federal requirements.
  • Develop a stormwater management plan and an erosion sediment control plan, as project planning progresses.
  • The following stormwater management best practices will be considered and implemented as required:
    • Reduce amount of exposed soil;
    • Install sediment control measures before grading/land alterations begin;
    • Sequence early works activities so that soil is not exposed for long periods of time;
    • Protect storm drain inlets to filter out debris; and
    • Stabilize all exposed soil areas as soon as land alterations are complete.
  • Discharge excess water into nearby municipal sanitary and storm systems where possible.
  • TRCA, Waterfront Toronto, and City of Toronto will be consulted to avoid potential infrastructure conflicts and impacts to flood protection measures/initiatives.

← Return to Early Works: Lower Don Bridge and Don Yard Draft Report

Submissions are closed.