Hong Kong is used to heavy rainfall. Following the collapse of part of the Island's north facing hillside in the 1970s, massive underground reservoirs were constructed to hold excess rainfall and route it into the sea to the south of the island. On Friday, though, it suffered its heaviest rain since records began 140 years ago. Apart from major flooding, the north shore of the island escaped with relatively little damage. On the south side, though, it was a different matter. The torrential rain resulted in part of the hillside in front of the expensive privately-built residences in the Redhill development collapsing, leaving some housing in imminent danger of collapse into the water. It is thought that illegal construction of a swimming pool and an underground car park weakened the retaining wall.

https://www.theguardian.com/world/2023/sep/12/hong-kongs-multimillion-dollar-cliffside-mansions-on-brink-of-collapse-after-record-rains

Thanks for this. As you know I have an interest in HK!