This landslide took place due to climatological factors. Rainwater seeped through the joints and pores which got dammed up later on causing this landslide. 

 A report on recent landslides in Thodupuzha, Udumbanchola and Devikulam taluks, Idukki district, Kerala by C. Muraleedharan, Geologist (Sr) and M. P. Muraleedharan, Director, Opn TNPK, Unit Kerala, Thiruvananthapuram (2007)

Kudikayathil
Vathikkudi
Retaining wall and culvert may be reconstructed with weep holes to protect the failed slope and to arrest further advancement of the slide. Caution to be excercised during rainy season. Awareness campaign may be arranged in the affected area.
Water percolated through thin soil cover and highly jointed bedrock due to incessant rainfall. This water got channelized and seeped through subhorizontal  joints. Later this water has created enormous pore water pressure and reduced shear strength of ov