Analysis of Rainfall Effect to Slope Stability in Ulu Klang, Malaysia

Malaysia is a country that is located near the equator line with tropical climates which receives highabundant rainfall, averaging 2,400mm annually. this makes malaysia prone to the landslide events as rainfall is one of the main triggering factors that can cause landslide. landslides in malaysia are mainly attributed to frequent and prolonged rainfalls, in many cases associated with monsoon rainfalls. of these, ulu klang area has received the most exposure. the area has constantly hit by fatal landslides since december 1993. this paper is aimed to investigate the correlation between the effective working rainfall and soil water index (swi) methods with the landslide events in ulu klang, malaysia. in this study 15 landslide events that occurred in ulu klang areas between years 1993 to 2012 were investigated and analyzed using rainfall threshold based on effective working rainfall and soil water index (swi) methods. the analysis results showed that these methods are significant tools that can be used to identify the rainfall critical threshold of landslide event.