並列摘要
Heavy rainfall causes the rising groundwater in slopes and is a common factor that may trigger massive landslides. Landslide correction may involve one or a combination of various subsurface drainage measures to reduce the groundwater pressure in the slope. Subsurface drainage measures also reduce the rate of groundwater rise and therefore the chance of landslide during heavy rains. This article aims at describing the subsurface drainage by catch wells; it also reviews several subsurface drainage methods. An example providing the layout and the construction procedures of a subsurface drainage system is presented as a reference for similar works.