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

25 Jun 2018 Cryosphere
CMP-B professionals trained on HEC-RAS Flood Modelling

ICIMOD is currently supporting a socio-economic and vulnerability assessment of the Punatshangchu basin as part of the Cryosphere Monitoring Programme ...

15 Apr 2015 News
Building capacity for grassroots action

With the aim to build capacity of researchers on conceptual and operational aspects of ecosystem management framework, a workshop was ...

9 Aug 2017 Himalica
Regional Conference on Mountain Agriculture Kicks Off in Kathmandu, Nepal

He said, "Some messages coming out of the Himalica experience are very clear. Improving farmers', especially women farmers', access to ...

11 Apr 2016 Gender in Koshi
Water, Women and Livelihood Improvement

Water is the lifeblood of every household in Nepal's middle hills, but accessing it is a challenge. Hill hamlets depend ...

16 Jul 2019 Atmosphere Initiative
South–South learnings for future collaboration in air quality and health research in the HKH

Day 1 of the workshop was dedicated to the existing literature on air quality and health, whereas Day 2 focused ...

1 Apr 2016 News
Building Expertise in CBFEWS

ICIMOD, in collaboration with Gilgit Baltistan Disaster Management Authority and Focus Humanitarian Assistance, is planning to pilot Community Based Flood ...

30 Sep 2016 News
HKH Researchers Convene “Writeshop” to Bring HIMAP Assessment to Reality

More than 50 researchers from institutions around the world convened in Dhulikhel, Nepal, this week to make a major push ...

8 Mar 2019 Gender in Koshi
Breaking Taboos: My Parents’ Stand for Gender Equality

Growing up, our sense of the world – all that is right in it and all that is wrong – ...