Flash floods 'imminent' after Chilcotin landslide: officials
CBC
The Tŝilhqot'in National Government (TNG) has declared a local state of emergency after a landslide blocked the Chilcotin River in British Columbia's Cariboo region.
The announcement came Thursday afternoon following a slide of soil and debris upstream of Nagwentled, also known as Farwell Canyon, around 285 kilometres north of Vancouver. The TNG said the landslide is currently fully blocking the river.
Emergency officials said earlier in the day that flash floods are "imminent" and could happen within 24 or 48 hours.
"Flooding is building up above the dam created by the landslide, so it's like a lake," Cariboo Regional District chair Margo Wagner said at a virtual news conference Thursday.
"There is a high risk of a flash flood downstream if the river breaches that landslide — which it is expected to do eventually."
At a news conference Thursday, Nathan Cullen, the B.C. minister of water, land and resource stewardship, said the dam created by the landslide is 600 metres wide and 30 metres deep.
B.C. Emergency Preparedness and Climate Change Minister Bowinn Ma said on-site monitors show water is slowly leaking through the dam.
The B.C. River Forecast Centre issued a flood warning for the Chilcotin River upstream of the landslide. It's also issued a flood watch for the Fraser River, from where it meets the Chilcotin River downstream to Hope, B.C.
Ma asked residents to stay away from the banks of the Chilcotin River from Hanceville to the Fraser River and anywhere on or along the Fraser River from the Chilcotin River to Hope.
"If this dam were to break, it is possible that dozens of evacuation orders will be issued along both rivers, and people need to be prepared," Ma said.
Wagner told reporters water could either rise up over the landslide, or water could cause a fissure in the earthen barrier, causing it to give way.
"We don't know exactly when this landslide is going to give way," she said. "There would be a mass of water coming down."
Satellite images show the Nagwentled area of the Chilcotin River before and after the slide:
She said many trees and debris from a wildfire in the region is also being held behind the landslide.
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