Geomorphological Processes and Human Impacts in River Basins (Proceedings of the International Conference held at Solsona, Catalonia, Spain, May 2004). IAHS Publ. 299, 2005, 46-55.

1 Department of Geography, The University of Hong Kong, Hong Kong, China

2 Fugro (Hong Kong) Ltd, Hong Kong, China

Abstract Landslides commonly occur on undeveloped hillslopes in Hong Kong, China. Heavy rainfall in June 2001 and May 2003 resulted in small landslides in a headwater drainage basin. Measurements of suspended sediment concentration made during the storm events, along with observations on sediment colour and C and N content, indicate that the suspended matter in streamflow was derived from the landslides, evidencing the connectivity of hillslope and channel systems. Estimates of the volume of failed material when compared to those of deposition revealed that much of the debris from the landslides remained on the slope in an ephemeral drainage line. At-a-point erosion from the landslides is much greater than that recorded by erosion pins in the same catchment.