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GEO Report No. 79
Report No. : GEO Report No. 79

Report Title : Investigation of Some Selected Landslide Incidents in 1997 (Volume 1) (1998), 142 p.

Author : Halcrow Asia Partnership Ltd.

Abstract

This GEO Report consists of four Landslide Study Reports on the investigation of selected slope failures that occurred in 1997. The investigations were carried out by Halcrow Asia Partnership Ltd (HAP) for the Geotechnical Engineering Office as part of the 1997 Landslip Investigation Consultancy.

Section 1 of this report presents the findings of a detailed study of a landslide (GEO Incident No. ME97/7/29) which occurred on the 2 July 1997 on a slope south of the Kowloon-Canton Railway Corporation (KCRC) University Station. Debris from the landslide obstructed the north-bound KCRC rail track and caused significant disruption to rail services throughout the morning. No fatalities or injuries were reported.

Section 2 of this report presents the findings of a detailed study of a landslide (GEO Incident No. ME97/7/30) which occurred on 2 July 1997, about 250 m southwest of the Kowloon-Canton Railway Corporation (KCRC) Fo Tan Station. Debris from the landslide obstructed the north-bound KCRC rail track. The first north-bound train of the day was partly derailed by the landslide debris, causing significant disruption to rail services. No fatalities or injuries were reported.

Section 3 of this report presents the findings of a detailed study of a flooding incident (GEO incident No. MW97/7/7) which occurred on 2 July 1997 at Mei Chung Court, Shatin. During the rainstorm of 2 July 1997, blockage of a natural stream course at a footbridge caused stream flow to over-spill onto a nearby footpath and into the Mei Chung Court housing estate. This resulted in severe erosion of the slopes on the boundary of the estate and within a play area, and the inundation of the lower level of a multi-storey car park with floodwater and debris. No fatalities or injuries were reported.

Section 4 of this report presents the findings of a detailed study of a flooding incident on 2 and 3 July 1997, which caused considerable disruption to the east- and west-bound carriageways of Tuen Mun Road. Stormwater from the Tai Lam Chung Catchwater overflowed into a natural stream course as a result of blockage of the catchwater with debris from three landslides. The stormwater caused considerable erosion of the stream bed and banks. Debris from the stream was carried into and choked the drainage system above a registered cut slope adjacent to Tuen Mun Road. As a consequence, water and debris was discharged onto the road and caused its closure for 5.5 hours west-bound and up to 15.5 hours east-bound. No fatalities or injuries were reported.


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