The section through the Pipeline Road/ Coquitlam watershed was highly controversial when installed in 1990. It is controlled by Metro Vancouver’s water utility – that’s why the proposed twinning avoids this section. For now, at least.
The new pipe is 24” diameter (up from 20” in the earlier project description). This will twin the existing 10” pipe originating in Coquitlam, which is stepped up to 12” diameter through the Coquitlam Lake watershed, but is 10” thereafter all the way through to Vancouver Island.