Back to news
30 May 2017 | News

Soil Erosion a Serious Concern in the Koshi Basin

The high rate at which soil erosion is taking place in the Koshi Basin of Nepal is a serious concern. Soil erosion impacts not just the fertility of agricultural lands negatively, but also the habitats of fish and other species by causing sedimentation in streams and rivers, and clogging waterways.

The entire Koshi Basin in Nepal lost an estimated 40 million tonnes of soil between1990 and 2010, according to a study conducted by the Koshi Basin Programme at the International Centre for Integrated Mountain Development (ICIMOD) (http://journals.plos.org/plosone/article/comments?id=10.1371/journal.pone.0150494). The study, supported by the Australian Government’s Department of Foreign Aid and Trade (DFAT) through Sustainable Development Investment Portfolio (SDIP), made efforts to fill the information gap on erosion patterns and dynamics from 1990 to 2010 using geospatial technology.

1 min Read

70% Complete

Published in 2016, the study showed that the soil loss rate estimated was 22 million tonnes per hectare of barren land per year, with 18 million tonnes in 1990 and 15 million tonnes in 2010. In addition, the total soil loss from agricultural land was estimated to be 10 million tonnes in 1990 and 14 million tonnes in 2010. An estimated 39 million tonnes of soil was lost in 1990 and 42 million tonnes in 2010.

Identifying soil loss areas is crucial for planning effective interventions at the ground level in the most erosion-affected areas. Erosion priority areas can be determined for planning and implementing conservation measures and erosion management in Nepal, where there is huge loss of arable land due to soil erosion.

Land cover management approaches such as gully plugging, afforestation of degraded land, improving infiltration through construction of pits, and crop management for vegetation cover, among others, can be implemented in fields on hillslopes, or at the watershed scale in the future.

Studies have shown land degradation, sedimentation, and ecological degradation tend to increase as a result of inappropriate land use and management practices. Soil erosion is contributing to substantial changes in basin hydrology and inundation in the transboundary Himalayan river basins.

Initiatives are needed to help increase awareness among farmers and are crucial to identifying the best options for farming practices to reduce soil loss from cultivated land and provide support for the implementation of appropriate measures.

Stay current

Stay up to date on what’s happening around the HKH with our most recent publications and find out how you can help by subscribing to our mailing list.

Sign Up

Related content

Continue exploring this topic

22 Sep 2017 Solar Pumps
Nepali Engineers Explore New Irrigation Systems

Thirty irrigation engineers—10 of them women—from DOI participated in the training. Titled Energy Efficient Irrigation Systems using Solar Pumps, the ...

27 Mar 2015 News
SERVIR-Himalaya takes satellite imagery technology to the grassroots

Community members learn to use satellite imagery for monitoring their forest More than 30 community members from Khayar Khola watershed in ...

8 Apr 2016 News
Teesta Basin Visit Reveals Spring Knowledge Gaps

HI-AWARE researchers from the International Centre for Integrated Mountain Development (ICIMOD), The Mountain Institute-India and local organisations recently visited Santook ...

16 Apr 2015 News
Celebrating world water day

The International Centre for Integrated Mountain Development (ICIMOD), in collaboration with various national and international ...

Kidney Beans Improve Income and Nutrition in Kailash Sacred Landscape

  ICIMOD’s Kailash Sacred Landscape Conservation and Development Initiative (KSLCDI), in partnership with the Central Himalayan Environment Association (CHEA), has identified ...

6 Apr 2022 News
ICIMOD and Nepal Mountaineering Association embark on a partnership for mountains

Kathmandu, 5 April: A memorandum of understanding was signed between the International Centre for Integrated Mountain Development and Nepal Mountaineering ...

Call for papers: Special issue of the Nomadic Peoples journal

The Nomadic Peoples journal invites paper submissions for a special issue on ‘Pastoral resilience and transformation in the Hindu ...