Water is rising in the lake behind the slide at about 22 centimetres per hour
Officials say the worst-case scenario from the Chilcotin River landslide would be about a 30-centimetre increase in the Fraser River when the water and debris reaches Hope in 29 hours.
From there is would take 1.5 hours for the water and debris to reach the Farwell Canyon Bridge and continue downstream. Chapman said to put it into perspective, a typical freshet flow is around 300 cubic metres per second, whereas this peak flow would be closer to 6,500 cubic metres per second. The next point would be the confluence where the Fraser River meets the Chilcotin, and Chapman said it would take roughly three hours for the material to make its way there.
Once the material reaches Hope, it would be would be 29 hours after the overtopping of the dam. The Fraser would see about a 30-centimetre increase. In this case, the water would go over top of the dam and then take 24 hours to"slowly downward cut a new channel within the current material that is there, before that material fully gives way."
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