WC145 NovDec 2025 - Magazine - Page 19
Black and Veatch, Wikimedia
WAT E R C A N A D A . N E T
What is predictive flood mapping?
In simple terms, predictive flood mapping uses real-time
weather data, historical flood records, hydrological models,
and advanced mapping technologies to forecast where and
when flooding is likely to occur. By combining satellite imagery, LiDAR data, GIS tools, and rainfall predictions, these tools
identify high-risk zones before disaster strikes.
Dr. Slobodan P. Simonovic, professor emeritus at Western
University and a leading expert in flood risk management, says
these tools have long-term benefits beyond short-term alerts.
“The key purpose of these predictive tools is, first and foremost, to prevent the loss of life, then to minimize economic
damage, and to develop rules and regulations that can better
manage such risks in the future. That means accounting for
climate change, land-use changes, urbanization, and population migration, all of which are factors we integrate when
using these types of maps,” he explains.
Predictive flood mapping doesn’t just warn residents; it also
shapes infrastructure planning. Accurate maps guide the design
of stormwater management systems that can handle extreme
rainfall and reduce localized flooding. In turn, stormwater capacity data strengthens flood models, making predictions more
precise. Without this integration, urban areas risk being caught
off guard when severe weather hits.
While predictive tools provide foresight, governments also
rely on coordinated national programs. To enhance these
capabilities, the federal government has invested in the Flood
Hazard Identification and Mapping Program (FHIMP).
Natural Resources Canada (NRCan) spokesperson Devin
Baines noted that flood mapping is ultimately the responsibility of provinces and territories, with FHIMP acting as a key
partner.
He explained that the program advances collaboration
through cost-sharing agreements with every province and
territory, standardized Federal Flood Mapping Guidelines, and
technical working groups that bring together governments and
private stakeholders. FHIMP also maintains the Canada Flood
Map Inventory to share studies and avoid duplication, and has
developed Indigenous Engagement Guidelines to ensure local
realities are reflected in the process.
“FHIMP is working to increase Indigenous engagement in
flood mapping, including by creating tools to guide provinces
and territories to properly engage with Indigenous peoples and
providing contribution funding to further Indigenous Traditional Knowledge alongside traditional science,” Baines adds.
Toronto vs. Surrey/Coquitlam
In response to the July 16, 2024 flash flooding, the City of
Toronto has undertaken extensive flood-mitigation projects,
including the $323 million Rockcliffe-Smythe Flood Mitiga-
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