Tea gardens have been great majority constituted land cover and
tea farming has been widely made in the study area. But, the
roots of tea tree are tightly set and have been obstructed surface
flow. So, superficial water has been gotten into soil materials
and its saturation increased. The soil materials that saturated
have been showed higher stress- lower resistance. Thus,
movements have been become easy. Also, distribute acidic
manure over a tea garden have been increased weathering speed
of soil materials and this event invest the situation with
additional horrors for landslide.