In response to increasing frequency of critically low summer flows in the Cowichan River, a partnership was formed by the Cowichan Valley Regional District (CVRD), Cowichan Tribes, the Cowichan Watershed Board and Catalyst Paper (a Paper Excellence company) to conduct a Water Use Planning study as per the Province of BC Water Use Plan (WUP) Guidelines of 1998.
A Public Advisory Group was formed and, beginning in the Fall of 2017 and finishing in the Spring of 2018, the group developed a Water Use Plan (WUP) for Cowichan Lake and Cowichan River that provides a balanced, long term solution for storing water on Cowichan Lake in order to maintain sufficient water flows in the Cowichan River into the future. The key recommendation is to construct a new weir with an increase of 70 cm of elevation above the existing weir (go to the Cowichan Lake Weir Design page to learn more about this project).
A condition of this recommendation is that an assessment be done of the potential impacts to Cowichan Lake shoreline due to the additional storage required to meet future needs. The assessment is being funded entirely by the BC Salmon Restoration and Innovation Fund through a grant that was awarded by Fisheries and Oceans Canada.
The Shoreline Assessment will determine the potential impacts to the Cowichan Lake shoreline due to holding water earlier and at a higher level than historically typical in the spring period. This assessment will be used to guide the response and approach of the Province of BC in approving a water licence and any responsibilities of a future licence holder to those property owners where effects may be projected.
The Shoreline Assessment includes the following work:
- Develop an analysis of key natural processes, processes produced from human activities, and timing windows that determine the lake’s natural boundary definition between the lake and the riparian zone using a mixture of GIS analytics, reviews of the existing natural boundary surveys, background technical reports, selective site reviews and surveys, and physical analysis.
- Determine the current shoreline of the lake – natural boundary between lake and riparian zone (the area between the lake and the land made up of lush, green, moisture-loving vegetation that surrounds the lake)
- Determine the Lake’s average annual high water mark, current and future forecasted
- Determine if there will be changes to the shoreline of Cowichan Lake based on changes from a new weir and operating criteria.
- Determine if a 70 cm increase above the current weir height during the spring holding period will detrimentally affect a riparian owners rights (i.e., access to and from the water, protection of the property from erosion, ownership of naturally accumulated material, and use of water of undiminished flow and quality for domestic purposes) or where land will be physically affected by the extended storage.
- Undertake an analysis of potential future impacts of raising early summer water storage levels on the shoreline of Lake Cowichan.
The Shoreline Assessment report will be made publicly available upon its completion which is anticipated to be in 2022. Updates will be provided through this website throughout the project. If you have questions or concerns, please contact the CVRD Project Manager at firstname.lastname@example.org .
Check out Leroy’s Corner for updates as the project progresses.