Report No. : GEO Report No. 366

Report Title : Review of Landslides in 2021 (2024), 53 p.

Author : C. Lam, V.S.F. Kong & R.W.H. Lee

Abstract

This report presents the findings of a diagnostic review of the landslides in 2021 that were reported to the Government. The review forms part of the systematic landslide investigation programme, which is an integral component of the Government's slope safety system. The aims of this report are to review the performance of the Government's slope safety system and identify areas for improvement, as well as to further enhance the slope engineering practice in Hong Kong.

Altogether, 146 genuine landslides in 2021 were reported to the Government of which 13 were major landslides (viz. failure volume of 50 m³ or more), including one that occurred on an engineered man-made slope. There were also seven minor landslides (i.e. failure volume less than 50 m³) occurring on engineered man-made slopes. The corresponding annual failure rate of engineered slopes is about 0.021% on a slope number basis (i.e. number of landslides relative to the total number of engineered slopes).

Overall, 99.98% of the engineered man-made slopes performed satisfactorily without occurrence of landslides in 2021.

Download Document(s)