Based on the early research, the loose material on the upstream part of the Melamchi River activated due to the long monsoon rain. Sindhupalchowk being one of the most affected districts in 2015 earthquake, it is suggested that the mountain relaxation activated the debris flow. The continuous rainfall triggered numerous landslides around Melamchi. Melamchi River was blocked by one of the landslides for few hours creating Landslide dam. This dam burst generating flash flood with mix of debris mixture with sand, boulders and wood fragments.