Reclaiming a lost wetland
Wetland restoration expert Tom Biebighauser talks to NCC staff about the wetland restoration process. (Photo by NCC)
The Nature Conservancy of Canada (NCC) has broken ground on an ambitious project to restore close to six acres (close to 2.5 hectares) of wetlands in the Cowichan Estuary on Vancouver Island.
The wetlands are in the low-lying section of NCC’s Chase Woods Nature Preserve. Before being drained and converted to agricultural use, these marsh wetlands connected to the Cowichan Estuary and provided important habitat for rearing salmon and for waterfowl in the winter.
With approximately 60 per cent of shoreline marsh habitats in the Salish Sea having been lost, opportunities to restore these ecosystems are rare and important. The drained marshes on the Chase Woods Nature Preserve provide an exciting opportunity for coastal wetland habitat restoration.
Under the direction of wetland specialists Robin Annschild and Tom Biebighauser, and working with Cowichan Tribes and the Province of BC, the project broke ground on June 25, after two years of planning and development. The first phase focuses on re-creating the historical slow and winding path of a creek that had long ago been diverted into a deep ditch in order to drain the marshland through which it flowed.
“We made good progress,” said Jocelyn Wood, West Coast stewardship coordinator with the Nature Conservancy of Canada. “The site was dry — perfect working conditions for heavy equipment and minimal disturbance to wildlife. It still looks chaotic — think of your kitchen midway through baking a cake — but within the next 12 to 24 months the area will really come to life.”
Prior to breaking ground, archaeological impact assessments were undertaken through soil test pits. Archaeologist Genevieve Hill and Cowichan Tribes cultural monitor Harold Joe are providing direct and ongoing oversight throughout the project.
Phase one included:
- Mowing and removing reed canary grass and Himalayan blackberry (invasive plant species);
- Removing fill and refuse left over from previous agricultural and residential use;
- Removing a well and installing a vertical grade structure at the stream entrance to the wetlands to prevent erosion;
- Creating six wetland ponds and the initial stages of the stream that will meander through them; and
- Adding woody debris and transplanting of native plant species.
Funding for the Chase Woods Wetland Restoration Project came from the Katzaa Foundation, WC Kitchen Foundation, Coca-Cola Foundation and the Pure Green Earth Fund.