Report No. : GEO Report No. 336

Report Title : Detailed Study of the 21 May 2016 Landslide on the Natural Hillside above Slope No. 8SE-A/F34 at Sai Kung Sai Wan Road, Sai Kung (2018), 101p.

Author : AECOM Asia Company Limited

Abstract

This report presents the findings of a detailed study of a landslide incident (Incident No. 2016/05/1823) that occurred on a natural hillside above Sai Kung Sai Wan Road, Sai Kung East Country Park following the intense rainstorm during the early morning of 21 May 2016. The landslide involved a total source volume of about 2,100 m3 and comprised a translational rock slide. The detached material travelled a distance of about 500 m down the hillside eventually coming to rest in a natural drainage line above High Island Reservoir. Sai Kung Sai Wan Road was completely blocked with debris and the fill slope below (Slope No. 8SE-A/F34) was partly eroded, undermining the road and resulting in road closure for several months. Some outwash debris was transported into the reservoir. No casualties were reported as a result of the landslide.

The key objectives of the study were to document the facts about the landslide, present relevant background information and establish the probable causes of the failure. The discussion and views expressed in this report are not intended to establish the existence of any duty at law on the part of the Government of the Hong Kong Special Administrative Region (HKSARG), its employees or agents, contractors, their employees or agents, or subcontractors, or any other party. This report neither determines nor implies liability towards any particular organization or individual except so far as necessary to achieve the said objectives.

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