28-05-2025
- Climate
- South China Morning Post
Technology can help as Hong Kong's rainy season poses threat of landslides
The distinctive topography of Hong Kong, with steep hills rising majestically from the sea and skyscrapers sandwiched in between, gives the city its beauty.
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.
