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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 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.

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Tap(click) the map to start the line, then continue tapping(clicking) to define your line. Double-tap(click) to complete the line. The web browser may not register your tap(click) if you do it too quickly. Tap(click) and drag your finger(mouse), then move it to trace the line you would like to measure. Lift up your finger(mouse button) to calculate the distance.

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Tap(click) the map to start drawing the area, then continue tapping(clicking) to define your area. Double-tap(click) to complete the area. The web browser may not register your tap(click) if you do it too quickly. Tap(click) and drag your finger(mouse), then move it to trace the area you would like to measure. Lift up your finger(mouse button) to calculate the area and perimeter.

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Disclaimer
Flood maps displayed in the Flood Awareness Map Application are based on provincial flood studies developed using the best data available when a study is conducted. Information is subject to change, and the Government of Alberta assumes no responsibility for discrepancies at the time of use.
Hazard
Flood hazard maps define floodway and flood fringe areas.
Inundation
Flood inundation maps show areas at risk for different sized floods.
Likelihood
Flood likelihood maps illustrate cumulative flood risk over 30 years.
Range
Flood range maps compare two different sized floods.
Drafts
Draft flood maps from new studies in the finalization process.