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Posted: Oct 30, 2018
another blast 3:00pm January 11
AgricultureBuilding InspectionMapsPlanningNon-Medical CannabisSomass Watershed Flood Management Plan

Somass Watershed Flood Management Plan

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Rivers, lakes, and the inlet form the landscape of our region. We are studying flood management for the Somass River System so we can plan effectively for its future.

The Somass Watershed Flood Management Plan is just getting started. Over the coming months, the study team will be undertaking technical field surveys, flood level monitoring, and data analysis to build a more comprehensive picture of the Somass river system. As the Study unfolds, we will continue to provide updates on this webpage - please check back regularly.

Jan 14, 2019 - Project Start Letter

This project will prepare up-to-date flood mapping for the Somass watershed - including portions of shoreline along Great Central and Sproat Lakes; the Ash, Sproat, Stamp and Somass Rivers; the Somass River estuary; and, the tip of the Alberni Inlet.

This mapping will provide important information about how the river system works today and how it could be affected by changing climate, extreme storm events, and sea level rise. This will provide more certainty around potential flooding events and impacts.

Why is updated flood mapping important?
Flood mapping for this area was last completed in the mid-1990s. Since that time, there have been many changes including new development, changes in the landscape, changes in climate, as well as improved methods and accuracy for predicting potential flood hazard. Recent flood events have impacted both private properties and public resources - including a partial closure of Highway 4 in 2017. Public input has indicated a strong interest in better understanding potential flood impacts and mitigation options.

How Flood Mapping Helps Communities:

The Study was initiated in November 2018 and is anticipated to continue to early 2020. During 2019, the focus will be on gathering technical data and developing a hydraulic model for the watershed. Once data analysis and updated floodplain mapping is complete, community members will be invited to review the results and initiate discussions on potential mitigation options.


Please contact:
Alberni-Clayoquot Regional District
Planning and Development