Nagaland University Study Flags Dhansiri River Pollution, Recommends Revival Plan
Kohima, Nagaland: Researchers from Nagaland University have undertaken a comprehensive season-wise assessment of the Dhansiri River, a crucial yet neglected river system in Northeast India, and proposed targeted policy interventions for its revival. The study, which spans all four seasons of the year, offers an in-depth evaluation of the river’s pollution status and addresses a major gap in environmental research for the region.
Led by Dr. M. Romeo Singh, Associate Professor, Department of Botany, the study focused on analysing the physicochemical parameters of water collected from upstream, midstream, and downstream locations. Using the Water Quality Index (WQI) technique and the Weighted Arithmetic Index (WAI) method, the research provided a detailed, quantitative assessment of water quality fluctuations influenced by both anthropogenic activities and climatic conditions.
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The researchers found that the Dhansiri River is facing increasing pollution pressures due to urbanisation, domestic waste discharge, agricultural runoff, and ineffective waste management practices. Seasonal variations were particularly pronounced, with water quality sharply deteriorating during the summer due to high runoff and rising temperatures.
Key parameters like turbidity and total alkalinity exceeded permissible limits set by both national and World Health Organization (WHO) standards, most significantly in downstream regions, rendering the water ‘non-potable’ and unsafe for consumption.
“This study serves as an essential basis for the sustainable restoration of the Dhansiri River and comparable neglected water bodies in India. If its recommendations are implemented, it can set a precedent for river restoration that combines scientific research, policy reform, and public engagement,” Dr. Singh said, highlighting the significance of the study.
The team recommends a multi-pronged approach to revitalise the river ecosystem. Key suggestions include relocating dumping sites, banning direct trash discharge, introducing advanced wastewater treatment technologies, strengthening drainage infrastructure, and developing comprehensive regional water management policies. The report also stresses the importance of regular monitoring, public education, and community involvement to ensure long-term success.
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“Implementing these measures will not only improve water quality but also enhance public health, support sustainable agriculture, and foster ecological restoration. Future research should focus on biological indicators and assess the presence of heavy metals and emerging pollutants,” Dr. Singh further noted.
By covering all four seasons and analysing 16 critical water quality parameters, this study offers one of the most detailed insights into the health of the Dhansiri River to date. It also sets a benchmark for future river studies in under-researched regions, illustrating how environmental science can guide impactful policymaking.
