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Flooding in Calgary: Maps


The City of Calgary provides two different types of maps about flooding: a regulatory flood map and an inundation flood map.

A regulatory flood map highlights any areas that are in a flood zone where building regulations apply. If you live in a flood zone and are planning to build or renovate your property, this is a very important map for you to check out prior to planning any construction activities.

A flood inundation map highlights all the areas of our city that are at risk of river flooding. The chance of flooding changes based on the size of the flood, so there are numerous maps show the potential impact based on the size of the flood (i.e.: the area impacted by a 5 year flood vs. the area impacted by a 100 year flood).

Regulatory flood map

Calgary's regulatory flood map, also called a flood hazard map in Alberta, is used for land use planning. It shows designated zones of the floodplain where building and other regulations apply.

This map shows the floodway, flood fringe, and overland flow zones on the Bow River, Elbow River, Nose Creek and West Nose Creek.

Use the map below to check if your property is in the floodway, flood fringe or overland flow zone. Please note: mapping for Pine Creek and Radio Tower Creek is in progress.

Regulatory Flood Map​​​​

To learn more about the development and building regulations that apply in each designated flood zone, please refer to Part 3, Division 3 of the Calgary Land Use Bylaw.

Provincial flood hazard maps

The City of Calgary's regulatory flood map is based on the Alberta Government's flood hazard map, developed by Alberta Environment and Parks. View the provincial flood hazard map.

Flood inundation maps

Inundation maps show the area of surface flooding for floods that have the following:

  • 20% chance of returning (also called a 5-year return period)
  • 10% chance of returning (10-year return period)
  • 5% chance of returning (20-year return period)
  • 2% chance of returning (50-year return period)
  • 1% chance of returning (100-year return period)

They are created for public information, flood response planning, infrastructure design and environmental purposes. The City's inundation maps are based on modeling done in 2015.

Flood inundation maps​​​​

You can use the inundation map at the link above to determine if your property is in a flood risk area for a flood up to the 1% chance of returning (100-year return period) flood.

The three distinct types of inundation shown on the maps are:

  • Inundation - Area flooded due to riverbank overtopping.
  • Isolated - Low lying areas that will not be wet from riverbank overtopping, but may experience groundwater seepage or stormwater backup.
  • Potential failure of flood protection barrier - Low lying areas that could be flooded if an existing permanent flood protection barrier were to fail.

More information on the updated inundation maps and flood elevations (since the 2013 flood) can be found in the following technical reports:

Are you building or renovating?

If you are building or renovating, check the following maps to see if your property is in a flood risk zone:

If your property is in these zones, The City of Calgary provides flood elevation information to inform your design. Our planning department and the Land Use Bylaw (Part 3 Division 3) can guide you through flood-related building requirements for your property.

Since late 2011, property owners have been advised of both the official designated flood elevation per the Land Use Bylaw (based on the regulatory flood map) and the most up-to-date recommended flood elevation (based on the 1:100 year inundation map) for their specific property.

For frequently asked questions related to flood mapping, please visit our Flood Mapping FAQ page.

For a history of the 2013 flood, see Calgary 2013 flood.