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Flood Hazard Maps
Flood hazard maps define floodway and flood fringe areas for the 1:100 design flood. These maps are typically used for long range planning and to make local land use decisions, and are available to all levels of government and the public to help build resilient communities.
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Definitions
Flood Hazard Area – The flood hazard area is the area of land that will be flooded during the 1:100 design flood. The flood hazard area is typically divided into two zones, the floodway and the flood fringe.
Floodway – The portion of the flood hazard area where flows are deepest, fastest and most destructive. The floodway typically includes the main channel of a stream and a portion of the adjacent overbank area. New development is typically discouraged in the floodway.
Flood Fringe – The portion of the flood hazard area outside of the floodway. Water in the flood fringe is generally shallower and flows more slowly than in the floodway. New development in the flood fringe may be permitted in some communities and should be flood-proofed.
Design Flood – The minimum design standard in Alberta is the 1:100 flood, which is defined as a flood whose magnitude has a 1% chance of being equalled or exceeded in any year. The design flood can also reflect 1:100 ice jam flood levels or be based on a historical flood event.
Additional Information
Flood maps are not available in all communities and flood risks exist in areas without flood mapping.
Contact Us
For more information about flood maps and the provincial Flood Hazard Identification Program please visit www.floodhazard.alberta.ca or email us at aep.flood@gov.ab.ca.
Flood Inundation Maps
Flood inundation maps show areas at risk for different sized floods, including ice jam floods in some communities. These maps also identify areas that could be flooded if local berms fail, and are typically used for emergency response planning and to inform local infrastructure design.
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Additional Information
Flood maps are not available in all communities and flood risks exist in areas without flood mapping.
Older flood studies include maps for as many as three flood scenarios, and newer studies include maps for as many as thirteen scenarios, from the 1:2 flood to the 1:1000 flood. In areas where a selected flood scenario is not available for all studies, other flood scenarios may be also be displayed. Flood maps in the same area may be available for smaller or larger floods.
Contact Us
For more information about flood maps and the provincial Flood Hazard Identification Program please visit www.floodhazard.alberta.ca or email us at aep.flood@gov.ab.ca.
Steep Creek Application
This application displays the results of assessments for the Alberta Environment and Parks (AEP) and Alberta Transportation (AT). These assessments included an inventory and risk-based prioritization of hydrogeomorphic hazards in Alberta, Canada. This application displays regional information for general hazard screening purposes only, and should not be used for site specific land use planning, development or mitigation measures design. The information as depicted is subject to change; therefore the Government of Alberta assumes no responsibility for discrepancies at the time of use.
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Additional Information
BGC. (2015). Steep Creek Fan Hazard Inventory and Prioritization, Rocky Mountains, Alberta – Final. Edmonton, Alberta: Alberta Environment and Parks.
Flood Forecast Maps
Flood forecast maps give context to advisories and forecasts by illustrating potential flood areas for smaller and larger flows than expected. These maps are not predictions of flooding for the current forecast flow range, but use pre-existing mapping for other flows to convey what areas could be at risk.
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Additional Information
Flood forecast maps are created using pre-existing flood inundation mapping from provincial flood studies. The maps may not be available for all areas with current advisories or flood forecasts.
The potential flood extents shown on the maps are not based on current flows or on any specific flows in the current forecast flow range, but are based on pre-existing mapping for other flows that are smaller or larger than the forecast flow range.
The intent of flood forecast maps is to provide emergency managers and other stakeholders with a general indication of what could be at risk based on a current flood forecast, but they are not a prediction of flooding. The maps show a potential range of risk using floods that are smaller and larger than what is expected based on a current flood forecast flow range.
For clarity and to prioritize illustrating the worst case potential flood condition, protected areas at risk behind flood berms are only shown for the larger flood.
Flood forecast maps are updated as forecasts change and as more information becomes available, both before and during a potential flood event. Please refer to the advisories and flood forecast information found at rivers.alberta.ca for official details on current conditions. For more information about local emergency preparedness and response, please contact your municipality or First Nation administration.
Contact Us
For more information about flood maps and the provincial Flood Hazard Identification Program please visit www.floodhazard.alberta.ca or email us at aep.flood@gov.ab.ca.
For additional and current flood forecast information please visit rivers.alberta.ca.
Flood Range Maps
Flood range maps compare two different sized floods, and help communicate what parts of a community can become at risk as flows change during a flood event. Protected areas at risk behind flood berms are only shown for the larger flood being displayed, but may also exist for the smaller flood.
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Additional Information
Flood maps are not available in all communities and flood risks exist in areas without flood mapping.
Older flood studies include maps for as many as three flood scenarios, and newer studies include maps for as many as thirteen scenarios, from the 1:2 flood to the 1:1000 flood. In areas where a selected flood scenario is not available for all studies, other flood scenarios may be also be displayed. Flood maps in the same area may be available for smaller or larger floods.
Flood maps are not available in all communities and flood risks exist in areas without flood mapping.
Contact Us
For more information about flood maps and the provincial Flood Hazard Identification Program please visit www.floodhazard.alberta.ca or email us at aep.flood@gov.ab.ca.
Flood Likelihood Maps
Flood likelihood maps illustrate cumulative flood risk over 30 years. Different sized floods can occur any year, but smaller floods tend to occur more often than larger floods over time. These maps do not show areas protected behind flood berms unless water levels are higher than the berms.
Additional Information
Flood maps are not available in all communities and flood risks exist in areas without flood mapping.
Contact Us
For more information about flood maps and the provincial Flood Hazard Identification Program please visit www.floodhazard.alberta.ca or email us at aep.flood@gov.ab.ca.
Help Using the Measuring tools
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Measure By Line
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Measure By Area
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Clear Measurement
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