Heavy rainfall and flash flood in the Pinder river eroded the toe of the slide and damaged about 60m road length. Also, during road widening vulnerable discontinuity planes got daylighted causing failure.

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_ 051
About 500m upstream of Amsaur
Concrete retaining wall, road filling with proper compaction.
Heavy rainfall caused saturation which together with toe erosion of the slope by Pindar River caused movement of slide. There was also failure along joint plane.