Due to unprecedented rainfall and cloud burst in the Alaknanda valley, flash flood occurred in the river and it had eroded the toe at both banks. Already saturated debris material with diminishing shear strength failed because of this.  

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_ 003
Near Jaypee guest house, Lambagarh, downstream of Daya bridge.
Removal of overhang blocks, concrete retainig wall, diversion of surface run off, breast wall with weep holes and lined toe drain, slope modification by providing benches.
Toe cutting by Alaknanda River, heavy precipitation caused saturation of unsorted slope material resulting in reduction of shear strength of the debris mass.