Officials caution that increased slope drainage capabilities will be necessary due to anticipated more severe weather conditions in the coming years.
As much as 60 percent of the landslides occurring annually on Hong Kong’s private slopes can be attributed to inadequate upkeep, according to findings from local authorities. They are now pressing for slope owners to address these issues due to the effects of climate change.
Government specialists stated that slopes would become susceptible to more severe weather conditions.
“Given the expectation of more severe weather conditions ahead, we may see increased precipitation during wet seasons, necessitating enhanced drainage capabilities for hillsides,” explained Lawrence Shum Ka-wah, who serves as the assistant director of the Geotechnical Engineering Office located on Hong Kong Island.
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He mentioned that drainage systems can handle obstructions caused by leaves or branches, yet extremely severe weather conditions have the potential to surpass their capacity.
On average, about 10 to 20 landslides took place annually on privately owned slopes throughout the last ten years, according to Shum, referencing a departmental assessment.
Typically, around 30 to 60 percent of these issues stemmed from inadequate maintenance by property owners.
He stated that the areas affected by landslides were determined by the pattern of rainfall, noting that no particular district needed extra focus. However, he emphasized that upkeep would be the primary issue to address.
Shum stated that authorities reported over 50 landslides on private slopes in 2023, during what was termed a “once-in-500-years storm.” Of these incidents, 30 percent resulted from inadequate maintenance.
The severe weather condition activated the city’s most extended black rainstorm alert, lasting over 16 hours. This transformed roads into waterways and left motorists trapped in their cars, while also inundating malls and train terminals. Over 100 individuals required medical attention at hospitals.
Shum additionally pointed out to the owners that they could bear responsibility for maintaining adjacent land parcels, even though these might not be detailed in their land lease agreements.
Currently, about 2,500 man-made slopes located on government land are maintained by private owners of adjoining lots.
Each year, the department chooses 100 individual ski slopes for safety inspections conducted by them.
When individuals are classified as hazardous, the authorities issue a Dangerous Slope Order (DSO) to the property owners. This order mandates them to conduct investigations and undertake required preventative measures using certified specialists.
By 2023, as stated by Robert Cheng, the chief building surveyor at the Buildings Department, 271 DHOs still remained unfulfilled by private property owners.
He urged the owners to keep their slopes maintained in order to avoid the risk of landslides.
Cheng also mentioned that routine inspections of the slopes as well as underground water pipelines were essential.
The administration likewise provides assistance to proprietors encountering monetary challenges, including grants and financing options.
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The article initially appeared on the South ChinaMorning Post (www.scmp.com), which serves as the premier source for news coverage of China andAsia.
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