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In June 2013, the Bow and Elbow rivers flooded Calgary, forcing tens of thousands of people from their homes and causing billions of dollars in damage across southern Alberta. Communities like Sunnyside, Hillhurst, Bowness, Mission, Erlton, Elbow Park, Roxboro, Rideau Park, Discovery Ridge, Inglewood and downtown were hit hard. Major mitigation work has been done since, but river and overland flooding remain a real risk for river-adjacent neighbourhoods. Here’s what Calgary homeowners should know.

Understanding Calgary’s Flood Zones

The City of Calgary and the Province of Alberta publish flood maps that show areas at risk from river flooding. You’ll commonly see two terms:

• Floodway: the river channel and adjacent areas where water flows deepest and fastest during a major flood. Development is heavily restricted.
• Flood fringe: areas next to the floodway that may flood, usually with shallower, slower water. Building rules require flood-proofing for new construction.

Even outside mapped zones, homes can flood from overland water (heavy rain pooling and flowing into basements), high groundwater during flood events, and sewer backups when the system is overwhelmed. Check the City’s flood maps for your address, and know your risk.

Insurance: The Big Gap

River and overland flood damage is not covered by a basic home policy. Since the 2013 flood, overland flood coverage has become widely available in Alberta as an add-on, but premiums and availability vary, and some high-risk properties face high costs or limits. Sewer backup is a separate add-on. Ask your broker exactly what you have. See our Calgary insurance guide.

If Flood Water Enters Your Home

1. Follow evacuation orders from the City and emergency services. Don’t return until it’s declared safe.
2. Don’t enter a flooded basement until power has been shut off by a qualified person or the utility.
3. Assume flood water is contaminated (Category 3): it carries sewage, chemicals and debris.
4. Document everything once it’s safe: photos, video, water lines on walls.
5. Contact your insurer and, if applicable, check whether provincial disaster recovery assistance has been announced for uninsurable losses.
6. Get professional cleanup started fast. After a regional flood, restoration crews are stretched thin.

What Flood Restoration Involves

• Pumping out standing water and silt
• Removing all porous materials that touched flood water: drywall (often well above the water line), insulation, carpet, underlay and particleboard
• Cleaning and disinfecting concrete, framing and hard surfaces
• Structural drying, verified with meters
• Rebuilding, ideally with flood-resilient materials

Full-basement flood restoration in Calgary commonly runs $30,000–$100,000+ with rebuild. See the cost guide.

Flood-Resilient Basement Ideas

• Backwater valve on the sanitary line
• Sump pump with battery backup
• Moving the furnace, water heater and electrical panel up where practical
• Closed-cell insulation and moisture-resistant board low on walls
• Tile or vinyl plank instead of carpet
• Keeping valuables and documents upstairs

Prepare Before Flood Season

Calgary’s highest river flood risk is typically late May through early July, when mountain snowmelt combines with heavy rain. Before then, review your insurance, test your sump pump, clear storm drains near your home, and have a grab-and-go plan if you live near the Bow or Elbow.

Related: sewer backup · mould · water damage restoration in Calgary