Water quality of the Ganges in West-Bengal during covid-19 lockdown and unlock period shows the betterment of bod level: An analytical study
Ratul Datta, Tapati Basu D Litt
Biological Oxygen Demand (BOD) is the life line of aquatic lives. In India, people have great dependency on the River Ganga (Paul, 2017). River Ganga is the resources of 25.2% water bodies in the country. The pandemic COVID-19 has made Government/ruling bodies all over the World to go for lockdown phase, which has immense effect on the biodiversity of the aquatic water bodies due to less anthropogenic waste discharges. In this present scenario a study was undertaken in three stations of the lower Gangetic delta (with the data bank of pre-COVID-19 lockdown and COVID-19 lockdown phases) to scan the DO level. In this paper we have tried to analyze the data available from Central Pollution Control Board database of different ghats of Ganga in West Bengal, 7 districts in total through which districts it has already flowed. Water quality data of upper and lower Gangetic delta region (Murshidabad, Hooghly, Howrah, N-24 Parganas, Kolkata, Nabadwip, S-24 Parganas) using BOD as major parameter were analyzed. A very significant decrease in BOD level during the COVID-19 lockdown phase was also observed. The decreasing trend observed from April 2020, w.r.t. March 2020 during full lockdown speaks in favour of the positive role of COVID-19 lockdown phase in terms water quality, which may be due to complete closure of industrial operations, vessel movements, fish landing and tourism activities at these sites.