We’re digging a kilometre-long river valley through the Port Lands. This extension of the Don River will be on average 100 metres wide, lined with meadows, marshes, wetlands, upland forests and parks. It will flow south from the Keating Channel across Commissioners Street, then west out a renaturalized river mouth into the Inner Harbour of Lake Ontario. Overall, we’ll excavate up to 1.4 million cubic metres of soil to create this new river valley.
Rocky is a rock ripping bucket. He’s specially designed to dig as deep as three metres in to bedrock to create slurry walls along the edges of the future river valley. Now that he’s done digging the slurry walls, Rocky has been promoted to site supervisor to oversee the rest of the river valley’s excavation.
What’s a slurry wall?
To excavate the new river valley, we need to keep the area dry and stable. To do this, we built temporary cut-off walls. In some places, we used concrete reinforced with steel. Elsewhere, we used a slurry of cement and clay.
What’s happening now?
We’ve started adding water to the new river. After the cut-off walls were complete, crews excavated the river valley itself. They dug as deep as six metres down in some places to create a renaturalized mouth for the Don River. We installed the bottom of the river and river banks using natural materials. We added plants and habitats for fish, birds and other animals.