Report No. : GEO Report No. 224

Report Title : Quantitative Risk Assessment of Landslide Hazards at Fu Yung Shan Tsuen, Tsuen Wan (2008), 177 p.

Author : H.N. Wong & F.W.Y. Ko

Abstract

A major landslide (Incident No. 2005/08/0362) occurred on a disturbed hillside within Fu Yung Shan Tsuen, Tsuen Wan, on 20 August 2005 resulting in one fatality. In December 2005, the Environment, Transport and Works Bureau requested the Geotechnical Engineering Office to undertake a quantitative risk assessment (QRA) of landslide hazards arising from man-made slopes, and natural and disturbed hillsides for the squatter area at Fu Yung Shan Tsuen.

The key tasks that have been carried out comprise hazard identification, mapping of facilities and population at risk, development of frequency and consequence models, quantification of landslide risk on facilities arising from man-made slopes, and natural and disturbed hillsides in terms of Personal Individual Risk (PIR), Potential Loss of Life (PLL) and F-N curves, and assessment of risk on facilities affected by overtopping of the Shing Mun catchwater due to blockage by landslide debris.

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