Montréal seeks temporary flood protection measure

Summary#

Montréal city council adopted a decision authorizing the city to apply for access to a temporary measure under the provincial Regulation respecting flood protection works (ROPI). The city also committed to study the 5 Avenue North dike in Pierrefonds-Roxboro by March 1, 2028, and confirmed it has no information suggesting the dike may fail to meet the regulation’s design and performance standards. City staff say the goal is to keep the current flood-zone classification while the dike is assessed.

  • If the city gets access to the measure, an area downstream of the dike may be mapped as a protected zone with residual risk (ZPRR) during the assessment period.
  • The city must submit a preliminary emergency plan by March 1, 2027, and evidence by April 1, 2027 that the performance study is underway.
  • The city must complete a detailed assessment of the dike by March 1, 2029. City staff say this assessment is required even if the city does not take full responsibility for the dike.
  • If a required deadline is missed, the new flood map may be published as soon as it is available.

What it means for you#

  • Residents and property owners near the dike: If the temporary measure is granted, the zone’s classification would remain based on the current transitional flood zones while the dike is assessed. This changes the map classification, not the physical flood risk.
  • People planning construction or renovations: City staff say the temporary classification could mean less restrictive rules for new residential construction, additions, or rebuilding in the ZPRR. The decision does not approve any specific project.
  • City of Montréal: The city must carry out the study and submit the listed material by the deadlines.
  • Taxpayers and property owners: The decision does not directly change taxes or property ownership.

Money#

The decision identifies costs for studies and outside professional services, but gives no estimate.

  • City staff say the costs will be planned within available financial resources.
  • No specific contract, funding amount, or fee is approved in this decision.

What is unclear#

  • The decision authorizes an application; it does not itself grant access to the provincial measure.
  • The exact boundaries of the area the dike protects have not been validated, according to city staff.
  • The decision does not give the study’s cost, the source of its funding, or how the city will report its findings to the public.

Case for#

  • The temporary measure could preserve the current flood-zone classification while the city studies whether the dike meets the required standards.
  • The study and emergency plan would provide information about the dike and how to respond to risks.
  • City staff estimate the measure could place about 110 buildings in a low-risk zone and help keep a proposed 410-unit housing and commercial project near Roxboro REM station under study.

Case against#

  • The low-risk classification could apply before the dike’s performance has been confirmed; the protected area’s precise boundaries are not yet validated.
  • The city’s statement that it has no information suggesting the dike may not meet standards is not the same as confirming that it does meet them.
  • The city must complete studies and planning work, but the decision gives no cost estimate.