Heavy rainfall in the area for 3-4 days caused saturation of debris material resulting into loss of shear strength and downslope movement of the slope material. 

An Interim Report on Preliminary  Geological  Slope Stability Assessment of the Recent Disaster Affected Areas in Parts of Chamoli District, Uttarakhand by Bhupendra Singh, Bhupender Singh, Ajay Kumar and Arindam Roy, Senior Geologists, M-IV, NR GSI Dehr
UK_CHA_SH_ 046
Near Kakra village along SH
Slope modification by benches, channelisation of surface run off, breast wall with weep holes, concrete retaining wall, road filling with proper compaction.
Due to heavy rainfall debris material got saturated and started flowing.