Technology can help as Hong Kong's rainy season poses threat of landslides
But the presence of densely populated areas so close to soaring slopes means landslides are a constant danger, especially during torrential summer rains.
A stark reminder was provided in September 2023, when the worst rainstorm in more than a century caused severe landslides and widespread flooding.
The resulting disruption highlighted weaknesses in the city's preparedness and response. Chief Executive John Lee Ka-chiu promised improvements. He spoke of 'technological constraints'. Those limitations are gradually being removed – and not before time.
Slope safety was one of the areas of concern. Shek O was cut off when mudslides and debris blocked the road. Shau Kei Wan, meanwhile, was hit by the largest rockfall recorded in almost 100 years, with a source area close to 2,000 square metres (22,000 square feet).
An urgent response was needed. The Geotechnical Engineering Office conducted an extensive review of risk-reduction strategies. The focus was on natural slopes in crucial areas such as busy roads with sole points of access.
Now, new technology is to be deployed in a bid to improve the identification of risky slopes and the ability to spot landslides and respond to them in emergencies – a necessary step.
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