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Unstable hill slopes along a Jhora (storm water mountain stream) at 6th mile, Tadong, Sikkim was found unstable showing horizontal and vertical movement of the hill slope due to inadequate drainage facilities, seepage and percolation of rain water through the cracks and joints developed over the hill slope surface. For a sloping stretch length of about 150 m where the hill slope has manifested into a major sinking zone, control of damages to large number of buildings and the main road had become essential. This was provided through a landslide control and weir training programme using Geosynthetics.