Landslides are triggered in Nepal due to a combination of steep mountains and unstable soils. The risk of the landslide is high in the monsoon season due to the lubrication of soil in the slope by moisture. Another important factor triggering the landslide is earthquakes. When landslide occurs near the river, it can block the river causing a damming effect. Damming could also occur due to rock-slides.[1] Such dams are unstable and can cause flooding if not breached in controlled manner. Below is a list of dams formed due to landslides and their impacts in Nepal Annually, 593 natural disaster occurs in average and quite a few of them are related to the damming by landslides and about 13% of fatality is directly related to the landslide and Landslides Dammed Outburst Flood (LDOF).[2]

List of landslide dams

  • 1988 September, Myagdi river: The rockslide in Darbang region of Myagdi river killed 109 people and dammed the river.[3]
  • 2012 May, Seti River: The location of dam is about 25 km from Pokhara. The flash flood killed 71 people.[4]
  • 2014, Sunkoshi River: 2014 Sunkoshi blockage
  • 2015 : The landslide of April 2015 blocked Tom river in Mansalu region.[5]
  • 2015, Kaligandaki river: 27 houses were buried and river was dammed for 16 hours by Baseri landslide. The river opened the channel without major damage.[6]
  • 2015, Marshyangi river: Gogane landslide blocked the river to accumulate about 150,000 m3 of water. The river opened up naturally.[6]
  • 2016, July, Bhotekoshi River: A GLOF event occurred in Tibet triggering flood in Bhotekoshi[7]
  • 2016,July, Tamor River: Rockfall blocked the river in Sawadin VDC near Mitlung Bazzar. The obstruction formed a lake about 500 metres long and 200 metres wide.[8]
  • 2017, April, Arun River: Nine houses were inundated near Bhotkhola in Sankhuwasabha.[9]
  • 2018, September, Badigad river: The river was blocked for 6 hours in Bhimgithe. The dam opened up naturally without threat of flooding.[10]
  • 2018, August, Budhi Ganga River: The river was partially blocked in the banks near Dwari in Budiganga Municipality. No full blockage occurred.[11]
  • 2020 June, Arun river: The landslide dammed the river forming a lake that was nearly 40 metres wide and height of 5–10 m. The river started breaking naturally.[12]

See also

Natural disasters in Nepal

References

  1. ↑ Weidinger, JT (2006). "Landslide dams in the high mountains of India, Nepal and China-stability and life span of their dammed lakes". Italian Journal of Engineering Geology and Environment. 1: 67?80.
  2. ↑ Shrestha, Buddhi Raj (2019-10-27). "An Assessment of Disaster Loss and Damage in Nepal". The Geographic Base. 6: 42–51. doi:10.3126/tgb.v6i0.26166. ISSN 2705-4624. Retrieved 2020-07-09.
  3. ↑ Upreti, Biswa Nath; Dhital, M.R. (1996). Landslide Studies and Management in Nepal. International Centre for Integrated Mountain Development. ISBN 9789291155026. Archived from the original on 24 March 2022. Retrieved 24 March 2022.
  4. ↑ "Making Sense of Nepal's Seti River Disaster" (Text.Article). 2014-01-24. Retrieved 2020-07-09.
  5. ↑ "Landslide Dams the Tom Khola" (Text.Article). 2015-05-07. Retrieved 2020-07-09.
  6. 1 2 Sunuwar, Subas Chandra (2018-06-04). "Nepal Earthquake 25 April 2015: Hydro projects damaged, risks and lessons learned for design considerations". Journal of Nepal Geological Society. 55 (1): 141–149. doi:10.3126/jngs.v55i1.22804. ISSN 2676-1378. Retrieved 2020-07-09.
  7. ↑ "Surviving Three Natural Disasters: Lessons Learned at Upper Bhote Koshi in Nepal". Hydro Review. 2017-11-01. Retrieved 2020-07-09.
  8. ↑ "Rockfall dams Tamor River". Retrieved 2020-07-09.
  9. ↑ "Houses inundated as Arun River gets blocked". Retrieved 2020-07-09.
  10. ↑ "Overflow of blocked Badigad River offers respite to locals - myRepublica - The New York Times Partner, Latest news of Nepal in English, Latest News Articles". {{cite web}}: Missing or empty |url= (help)
  11. ↑ "Bajura locals fear Budiganga river blockage - The Himalayan Times". Retrieved 2020-07-09.
  12. ↑ "Arun River in Sankhuwasabha partially dammed by landslide". Retrieved 2020-07-09.
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