Report No. : GEO Report No. 190

Report Title : Detailed Study of the 5 May 2003 and 13 June 2003 Landslides on Slope No. 6NE-B/C8 Fan Kam Road, Pat Heung (2006), 82 p.

Author : Maunsell Geotechnical Services Limited

Abstract

This report presents the findings of a detailed study of two landslide incidents (viz. Incident No. 2003/05/0009 which involved a landslide on slope No. 6NE-B/C8 and a boulder fall from the natural terrain above, and Incident No. 2003/06/0126 which involved another landslide on slope No. 6NE-B/C8) above Fan Kam Road, Pat Heung. No casualties were reported as a result of the two landslide incidents.

The first landslide incident occurred at about 5:00 a.m. on 5 May 2003 during heavy rainfall when a Red Rainstorm Warning was hoisted and the boulder fall occurred about one to two hours following the landslide. The landslide involved a failure volume of about 20 m³. Most of the landslide debris was deposited on the berm of the slope and some on the northeast bound lane of Fan Kam Road below. One lane of Fan Kam Road was closed temporarily as a result of the incident. The boulder fall involved a boulder with a volume of about 4 m³ that originated from the natural terrain above slope No. 6NE-B/C8. The boulder travelled some 80 m downhill and across both lanes of Fan Kam Road before coming to rest on the pedestrian pavement on the opposite side of the road. The boulder narrowly missed a vehicle parked on the opposite side of the road, shortly after the driver got out of the vehicle. A section of the pedestrian pavement close to the toe of slope No. 6NE-B/C8 was damaged by the impact of the boulder.

The second landslide incident occurred at about 2:00 p.m. on 13 June 2003 during modest rainfall and involved a failure volume of about 3 m³. The landslide debris was deposited on the berm immediately below the failure scar.

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