Landslides are triggered in Nepal due to a combination of steep mountains and unstable soils.
The risk of the landslide is high in the monsoon season due to the lubrication of soil in the slope by moisture.
Another important factor triggering the landslide is earthquakes.
[1] Such dams are unstable and can cause flooding if not breached in controlled manner.
Below is a list of dams formed due to landslides and their impacts in Nepal Annually, 593 natural disaster occurs in average and quite a few of them are related to the damming by landslides and about 13% of fatality is directly related to the landslide and Landslides Dammed Outburst Flood (LDOF).