During road widening, the slope was cut at a steep angle. The slope forming material is unsorted semi consolidated glacier moronic material. During heavy rainfall on 16th & 17th June 2013, slope forming material got over saturated and stared flowing down
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_ 024
Pagla Nala
Diversion of surface run off from slide zone, benches with lined drains, breast wall with weep holes and lined toe drain, concrete rataining wall.
Continuous heavy precipitation for 3-4 days resulted in saturation of overburden moraine deposit causing reduction in shear strength of debris material.