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Water Chemistry of Kolong River, Assam, India and Management Strategies

Kolong river which is located in Nagaon district of Assam, India is among the 275 most polluted rivers in India, according to a report of the Central Pollution Control Board, Government of India. The rise in pollution with respect to rivers over the last few decades due to their incredible importance in several human uses as well as a medium for provision of ecosystem services all over the world. The present investigation was carried out for a period of four seasons, namely, Pre-monsoon, Monsoon, Retreating Monsoon and Winter for the year 2017. Samples of water from two sites of the River Kolong, namely, Site I (Jakhalabandha) and Site II (Nagaon Town), were collected and analysed. The physico-chemical parameters such as water temperature, pH, Conductivity, Alkalinity, Transparency, Hardness, Chloride, Magnesium, Phosphate, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were evaluated. Observations imply that the water quality in Site II was poor and unfit for drinking, compared to Site I. The present study also includes a discussion on the economic implications of Kolong’s water quality and the strategies for its management. The study finally emphasizes that state intervention and people’s participation is essential for maintaining and preserving the ecological health of the Kolong river in its pristine state.