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Posted: May 27, 2021
 
 

Flood Mapping Reports

Somass Flood Study Header

The Somass Watershed Flood Management Plan provides a foundation for future watershed mitigation and adaptation planning.

Final Report

The Final Report summarizes the methodology used in developing the flood maps and provides a condensed overview of the Technical Appendices available below.

Final Report Thumb

FINAL REPORT 2020 (PDF | 3 MB)

Suggested Citation: Northwest Hydraulic Consultants Ltd. (2020): Somass Watershed Flood Management Plan. Prepared for the Alberni-Clayoquot Regional District.

Report Appendices
Appendix I Flood Depth Maps

The Flood Depth Maps provide a scientifically based estimate of potential flooding in four different coastal climate change conditions: present day (2019), year 2050, 2100, & 2200). These maps will be used for general consideration in high-level planning initiatives and do not inform Floodplain Bylaws.

Please refer to the Final Report above for more in depth description and explanation on these maps.

(NOTE: These maps are very large file sizes and may be slow to download)

Appendix J Designated Flood Maps

The ACRD's new Designated Flood Maps depict minimum flood construction levels based on a 200-year flood event - the Provincial standard for floodplain mapping. Having incorporated expected sea level rise and geomorphic uplift projected for the year 2100, as well as freeboard and wave effects at the shoreline, ACRD residents, property owners, and municipal staff can now determine which areas are most likely to flood and at what elevation building and development is at higher risk. Designated Flood Maps provide the basis for future legislated Floodplain Bylaws. These maps will help inform where and what kind of mitigation efforts are needed, whether it's building above a site-specific elevation (determined through qualified engineers) or constructing retaining walls and improving dikes.

Please refer to the Final Report above for more in depth description and explanation on these maps.

Click the Map Index image below to determine which Map Sheets to download

Map Index
Appendix J - Designated Flood Map Index