The road was constructed on slope wash / slope debris material. During heavy rainfall between 16th & 17th June 2013, the entire surface runoff percolated in the loose material developed pore water pressure and resulted into sinking and subsidence of road
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_ 028
Km 448 (NH 58)
Diversion of surface run off, construction of culvert across the road, breast wall with weep holes, sealing of cracks with impervious material, construction of retaining wall.
Continuous heavy rainfall  for 3-4 days resulted in saturation, slope cutting at steep angle during road widening, removal of fines from debris material by surface run off.