A recent North Eastern Space Applications Centre study has highlighted the continuing threat posed by riverbank erosion in Assam, particularly to agricultural land and rural livelihoods. 

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• The study used satellite-based remote sensing to assess erosion and land-use changes across Assam during 2016–2024.
• The study found that about 67,580.55 hectares of land were affected by river erosion during 2016–2024, of which 30,289.45 hectares, or 44.82%, was agricultural land.
• The most severe erosion occurred during 2018–2020, when around 26,627.89 hectares were affected and agricultural land loss reached 10,431.53 hectares.
• Barpeta, Dhubri, Nalbari, Morigaon and Goalpara emerged as important agricultural erosion hotspots, while Dhubri, Barpeta, Dibrugarh and Sonitpur repeatedly recorded high erosion levels.
• Major tributaries such as the Subansiri, Beki, Manas and Dhansiri contribute to localised erosion by altering river channels and increasing pressure on their banks.

Why is Assam highly vulnerable?

The Brahmaputra is a highly dynamic, braided river system carrying enormous quantities of sediment. Changes in river channels, high monsoon discharge and sediment deposition continuously reshape its banks and floodplains. Assam’s Water Resources Department estimates that more than 4.27 lakh hectares have been eroded by the Brahmaputra and its tributaries since 1950. 

• Riverbank erosion causes loss of fertile agricultural land, displacement of settlements, livelihood insecurity and damage to infrastructure, making it both an environmental and socio-economic challenge.

Government Response and Way Forward

The Assam Water Resources Department undertakes anti-erosion works, riverbank protection, embankment strengthening, river training and flood forecasting. 

• The Climate Resilient Brahmaputra Integrated Flood and Riverbank Erosion Risk Management Project promotes an integrated approach involving riverbank protection, erosion prediction, flood forecasting, remote sensing, nature-based solutions and livelihood resilience. 
• Regular satellite-based monitoring, river-basin-level planning and targeted erosion-control measures can help identify vulnerable areas before large-scale agricultural and livelihood losses occur.

Key Takeaway 

Assam’s riverbank erosion illustrates the interaction between river morphology, sediment dynamics, climate variability, agriculture, disaster management and human displacement, requiring a shift from isolated embankment construction towards integrated river-basin management.