New study finds clear‑cut logging can dramatically increase flood risk

By Spencer Pearson-Atkins, Xu Jian Yu and Younes Alila
The Conversation
July 6, 2026
Category: Forestry
Region: Canada West

…The 2021 floods in British Columbia’s Fraser Valley cost an estimated $14 billion in damages. Human activity that changes landscapes can make floods larger and more frequent. Our recently published study shows that clear-cut logging can dramatically increase flood risk, turning a 50-year event into a flood recurring every three years, with the largest and rarest floods showing the greatest sensitivity to forest disturbance. We studied a watershed on the west shore of Lake Okanagan near Summerland, British Columbia. Around 40 per cent of the site experienced logging. This watershed is no exception, as B.C.’s landscape has become dominated by clear-cut logging. …In our study, we found climate change is causing a reduction in flood risk due to reduced snowpack in the area. However, logging is not just compensating for that reduction, it’s also increasing the overall flood risk in the watershed. …The legal liability associated with logging and floods is significant. 

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