Flash flood occurred in the Alaknanda River and its tributaries due to heavy rainfall and cloudburst in the catchment which eroded both the banks and damaged the road net work.

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_NH_ 035
411.900 Km, Near Village Viroli
Diversion of surface run off,  boulder crate wall with deflection spurs, boulder masonary retaining wall for maintaining road width, breast wall with weep holes.
Heavy rainfall in the area which caused high flood in the nala.