Report No. : GEO Report No. 377

Report Title : Detailed Study of the 8 September 2023 Landslides on the Natural Hillside above Yiu Hing Road, Yiu Tung Estate, Shau Kei Wan (2025), 169 p.

Author : Fugro (Hong Kong) Limited

Abstract

This report presents the detailed study of a major landslide incident (Incident No. 2023/09/3235) that occurred on the natural hillside above two roadside registered cut slopes (slope Nos. 11SE-A/CR781 and 11SE-A/C782) on Yiu Hing Road near Yiu Hing House and Yiu Kwai House of Yiu Tung Estate, Shau Kei Wan. The incident occurred during a record-breaking severe rainstorm at around 2:36 a.m. on 8 September 2023. Both Black Rainstorm Warning and Landslip Warning were in effect at the time. Two landslides occurred with a total estimated failure volume of about 4,000 m³. The upper landslide was a small-scale, translational debris avalanche on an open hillslope with an estimated failure volume of about 100 m³ and the majority of the landslide debris was deposited on the natural hillside. The lower landslide was a massive-scale, structurally controlled translational rockslide on a spur with an estimated failure volume of about 3,900 m³. Some of the landslide debris was deposited over the crest and berms of the cut slopes, and the rest of the debris blocked a section of Yiu Hing Road, leading to its closure for several months. While there were no casualties, the landslide debris caused varying degrees of damage to the nearby facilities. Given the severity and close proximity to densely populated high-rise residential buildings in urban area, it received widespread media coverage.

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