Due to incessant rainfall for about a week the pore water pressure increased and the slope forming material (2-5m) resting on a steep slope diminished the available shear strength to a point where equilibrium was no longer sustainable in the slope.
Chasie M. &  Theophilus P.K., 2017: Updation of existing landslide inventory of North Eastern region based on the new incidences as and when occurs during the period, Unpubl. GSI progress report for FS 2016-79
The intercalated unit of shale and siltstone remained intact on the slope, however, the weak overburden in-situ soil cover failed due to over saturation. Landslide occurred on 22/05/2016
Nutan Lampur slide -1
NH 54, near Nutan Lampur
1. Height of retaining wall at the toe portion of the slope may be increased with sufficient weep holes and founded upon bedrock or firm sub-stratum. 
2. Easing of the slope by benching, slope dressing/removal of overburden
3. Channeling of surface drain
Cutting of natural slope at very steep angle for road construction destabilized the slope, and heavy downpour resulted in over saturation of the loosely packed overburden material which in turn increased pore water pressure and reduced its shear strength