“Temporal Trend Analysis of Water Quality in the Delhi Stretch of River Yamuna (2013–2023)”

Authors:

Nidhi Sharma¹, Prof Jai Gopal Sharma²

^{1Department of Biotechnology, Delhi Technological University.}

^{2 Department of Biotechnology, Delhi Technological University.}

ABSTRACT

This study evaluates the temporal trend in water quality of the Delhi stretch of the River Yamuna during the period 2013 to 2023 using linear regression analysis and Kendall’s Tau analysis. The analysis was done on the basis of secondary data obtained from Central Pollution Control Board monitoring records for some specific location. Mean value was calculated for each parameter to  find the pattern between the time period and change in water quality index of the river Yamuna.The results indicate that water quality was affected during time period used for study. Among all the selected parameters, it was found that Biochemical Oxygen Demand showed a statistically significant increasing trend, with a p-value of 0.0029, proving that there was a a gradual rise in organic pollution in the river over the noticed time period. This increase proves the continuous addition of untreated or partially treated polluted water, as well as growing anthropogenic pressure in the Delhi stretch. Fecal Coliform and pH also show some variation over the time period studied this suggest the pint that river is continuously influenced by both sewage contamination and changing chemical condition.

Key Words: Yamuna, pollution, statistics, Biochemical oxygen demand.