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Updated 1 year ago
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1:20 Flood Map (5% chance of occurring in any year)

(Note: Updated inundation maps for 1:2 to 1:1000 floods are available from Alberta Environment and Parks (2020). The new draft maps can be viewed here:

These inundation maps show whether a property is at risk for various sized river floods. The size of flood shown on this map has a 1/20 or a 5% chance of occurring in any year.

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

o Inundation - Area flooded overland due to riverbank overtopping.

o Isolated - Low lying areas that will not be wet from riverbank overtopping, but may experience groundwater seepage or stormwater backup.

o Protected - Area protected by a permanent flood barrier.

The flood areas shown are based on Alberta Environment and Parks most recent (2020) inundation maps. There is uncertainty inherent in predicting the effects of flood events, and this uncertainty increases for floods with less than a 1% chance of occurrence in any year. Any use of this data must recognizing the uncertainty with regards to the exact location and extent of flooding.

More information on flood mapping for Calgary is available at

For Calgary's River Flood story, see:

Querying over HTTP

Splitgraph serves as an HTTP API that lets you run SQL queries directly on this data to power Web applications. For example:

curl \
    -H "Content-Type: application/json" \
{"sql": "
    SELECT *
    FROM \"calgary-ca/120-flood-map-5-chance-of-occurring-in-any-year-hktr-86wa\".\"120_flood_map_5_chance_of_occurring_in_any_year\"
    LIMIT 100 

See the Splitgraph documentation for more information.

  • 120_flood_map_5_chance_of_occurring_in_any_year
Upstream Metadata