MoRTH Advanced Landslide Mitigation Measures for Climate-Resilient Hill Roads
The Ministry of Road Transport & Highways (MoRTH) is implementing comprehensive landslide mitigation and climate resilience measures for India's national highways in hill states, particularly focusing on the vulnerable Himalayan region. This initiative comes in response to increasing extreme weather events such as the devastating cloudburst in Uttarkashi's Dharali and Sukhi Top regions in August which caused flash floods and slope instability.
Technology-Driven Monitoring Systems
MoRTH is deploying advanced Interferometric Synthetic Aperture Radar (InSAR)-based landslide monitoring and early warning systems along a 100-km stretch of the Char Dham route in Uttarakhand. This technology enables detection of subtle ground movements and identification of vulnerable slopes before disasters occur. Additionally, an advanced warning and alert system is planned for the Parwanoo-Solan section of NH-5 in Himachal Pradesh to monitor landslides, land sinking, groundwater movement, and rockfall-prone zones in real time.
Infrastructure Scale and Cost Considerations
The initiative is particularly significant given that India has 16,788 km of National Highways in hill states out of a total NH network exceeding 1,46,570 km. Mountain highway construction costs range between ₹15-30 crore per km, with a single moderate landslide potentially causing repair costs of ₹10-25 crore and disrupting traffic movement for 2-5 days.
Policy Reforms and Construction Methodology
MoRTH has introduced a phased construction approach requiring an initial period of approximately one year dedicated solely to cutting hill slopes and completing protection works for slope stabilization. Road construction begins only after slopes demonstrate stability through at least one monsoon season. The Ministry has also implemented a policy on Normative Construction Periods providing additional time for projects in the Himalayas, North-East, Western Ghats, and Andaman & Nicobar Islands. Additional Right of Way is being provided with adequate land provisioned to facilitate proper slope stabilization and maintenance activities.
Strategic Institutional Partnerships
MoRTH has strengthened collaborations with multiple scientific agencies including THDC India Limited, Geological Survey of India (GSI), Defence Geo-informatics Research Establishment (DGRE), National Institute of Rock Mechanics (NIRM), and IIT Roorkee. Specific agreements include an MoU with GSI for geological investigations of tunnel projects and data sharing for geohazard studies, an agreement with THDC for specialized landslide mitigation works in Uttarakhand and Arunachal Pradesh, and partnership with DGRE for technical expertise in geo-hazard assessment and mitigation.
Scientific Slope Management Approach
Guided by an Expert Committee framework report from IIT Delhi, engineers now assess each slope based on rainfall patterns, groundwater conditions, and geological characteristics before selecting mitigation measures. Advanced technologies including drones, LiDAR surveys, and Digital Terrain Models are being used for detailed investigations. Site-specific solutions include soil nailing, high-tensile steel wire mesh, prestressed cable anchors, retaining walls, drainage systems, bamboo benching, and vetiver grass plantations.
Implementation Progress and Standards
In Uttarakhand alone, 58 landslide-prone locations have been treated, 96 sites are currently undergoing mitigation works, while DPR preparation and investigations are underway at 104 additional locations. MoRTH has developed comprehensive rockfall protection standards mandating European Technical Assessment (ETA) certification and CE marking, along with rigorous verification mechanisms including material quantity checks, barcode-based traceability, manufacturer testing, field validation, and proof-testing of anchors and rockfall nets.