New North Slope photos show vast expanse of material removed due to past slides & instability.
Just sent in to me this morning, these new photos of the infamous north slope of Site C- the slope that has caused so much trouble since day 1.
I’ve documented those issues many times with photo’s since 2016-even after they tried a no flight rule, which was quickly removed – here:
I include those links because they contain photos that, when viewed in contrast against these new ones, show just how much this slope has been flattened in order to mitigate the ongoing slide issues they experienced…and still do. You can see where even despite having had little rain, iron rich water seepage still stains the concrete coating of the terraced hillside.
It is because so much of this slope was removed that the design of the dam was changed – traditional dams are situated between two slopes of a higher angle to act as anchoring ‘walls’, or the sides of the dam. Here, because the north slip has such a low angle, and because of other geotechnical concerns and unknowns detailed in BCUC documents, the dam design had to compensate for that low angle. I detailed all this in my last post here, with those bcuc docs: https://lailayuile.com/2018/10/12/part-iii-old-fort-slide-as-evacuation-alerts-orders-continuemore-questions-for-site-c-geotechnical-concerns
Here is a pic of the north slope and inlet portals ( diversion tunnel) labelled:
And here is a pic of the current design showing this north bank, on the right, securing that side of the dam, followed by a larger pic for context:
It doesn’t take an engineer to see why so many question the wisdom of Horgan’s decision to continue this dam. It will continue to experience geotechnical issues and with a clear,documented paper trail of contractor quality control and compliance issues, it will continue to escalate in cost.
As the wise ( currently working) engineers who help me say, “Just because you CAN, doesn’t mean you SHOULD.”