Towards tackling landslides
None of the countries in South Asia has a comprehensive database and inventory of landslides and damages they have caused, according to a two-day workshop on landslide risk management in South Asia held in Thimphu on May 11 and 12.
Organised by Saarc Disaster Management Centre (SDMC) in collaboration with Ministry of Home and Cultural Affairs, it was noted that there were assessments of hazards, vulnerabilities and risks but countries followed different classification system, terminologies, methodologies and scales for landslide hazard zonation mapping.
The need to develop a common acceptable guideline on landslides hazard zonation mapping, hazard terminologies and classification system with the help of expert group under the auspices of the Saarc Disaster Management Centre in New Delhi, India, was agreed upon.
Participants recommended to set up a South Asia landslide forum comprising landslide experts, practitioners, and scientific and technical research organisations working for landslide risk management in the region.
The forum will network and integrate knowledge on landslide risk management within the framework of South Asia and meet at regional conference once in two to three years.
Participants deliberated on landslide problem in Bhutan. They said that, since Bhutan lies in a seismically active zone that is prone to earthquake of 4-5 Richter scale, it has to be prepared.
Participants also said that landslides occurs every monsoon because the measures taken are temporary, which reduce only the impact arising from them. The remedial measures taken are bio-engi neering, check dams, crack sealing, construction of retaining walls and wire mesh fences that do not mitigate the problems forever.
Environment Assessment Act 2000 requires proper drainage system during construction of roads since improper drainage is one of the factors contributing to landslides.
The participants also expressed concerns over the frequently occurring landslides in Kharbandi, Sorchen and Jumbja areas on the Thimphu-Phuentsholing highway. Though the Kharbandi and Sorchen landslides are about 20 and 30 years old respectively, no solution has been found to mitigate the problem that sometimes cut off Thimphu from India.
No risk treatment has been found except for an alternative route as an avoidance strategy for Sorchen landslide. While some participants suggested surfacing as an answer to almost 1-km Jumbja landslide, one proposed tunnelling as a bypass.
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