Report No. : GEO Report No. 352

Report Title : Review of Landslides in 2020 (2022), 48 p.

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

Abstract

This report presents the findings of a diagnostic review of the landslides in 2020 that were reported to the Government. The review forms part of the GEO's 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 further enhancing the slope engineering practice in Hong Kong.

Altogether, 214 genuine landslides in 2020 were reported to the Government, of which seven were major landslides (viz. failure volume of 50 m³ or more). There were 13 minor landslides (viz. failure volume of less than 50 m³) occurring on engineered man-made slopes. The corresponding annual failure rate of engineered slopes is about 0.041% on a slope number basis (i.e. number of landslides relative to the total number of engineered slopes).

Overall, 99.96% of the engineered man-made slopes performed satisfactorily without occurrence of landslides in 2020.

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