Narendra Nagar Landslide

The Real-Time Monitoring of Narendra Nagar Landslide uses various geotechnical instrumentation for landslide investigations aimed at developing an Early Warning System (EWS). The total area of the Narendra Nagar landslide site to be monitored is approximately 0.25 km2. 

The real-time monitoring of landslide-prone hill slopes involves a monitoring plan that not only provides immediate warning of landslide activity but also provides an understanding of the dynamics of slope failures. 

Typical real-time landslide monitoring systems consist of the following:

• Geotechnical Monitoring Instruments 
• Datalogging with wireless data transfer 
• Real-Time Data Monitoring Software.

Encardio-rite got the contract for complete monitoring works that included: 

• Supply and installation of geotechnical instruments 
• Supply and commissioning of wireless (GSM/GPRS) data transfer network
• Drilling for all the boreholes required for the installation of our instruments
• Real-time database management system

The geotechnical instruments included:

• In-place Inclinometer for monitoring sub-surface lateral movement/deformation
• Piezometer for monitoring sub-surface water pressures for slope stability evaluation
• Borehole extensometer – three-point (electrical) for monitoring sub-surface settlement/movement
• Crack Meter for monitoring crack opening 
• Creep Meter for monitoring large displacements/deformations of an active geologic fault in the earth
• Raingage for co-relating data from the above geotechnical instruments
• Compact  data logger to collect data from all of the above instruments and transfer to a central server

The instruments were located at three levels on the mountain: the crown, mid-level, and toe. Drilling and installing the instruments at all three locations on the slopes was difficult, especially at the toe. However, all the instruments were installed successfully and are giving reliable data at a pre-set frequency. 

Monitored data was available online through Encardio-rite’s in-house developed DRISHTI, a web-based data management system. The data was available in near real-time to the stakeholders on their laptops and mobile phones.