Water Quality Index Based Analysis for Variation of Water Quality in Gin River, Sri Lanka.
2023
Gunarathna, Kavishka | Samarakoon, Methsiri
The water quality of Gin River has deteriorated due to various severe reasons. The aim of this study was to determine the variation of water quality and to develop a mathematical model for water quality prediction. In this research, nine water quality parameters including pH, Dissolved Oxygen, Turbidity, Temperature, Biochemical Oxygen Demand, Total Phosphate, Nitrate, Total Solids, and Fecal Coliform were tested by collecting samples from January 2022 to May 2022 from six sampling locations. Afterward, Water Quality Index (WQI) was calculated using National Sanitation Foundation method. The highest value (66.24) was recorded at location 3 in January, and the lowest (55.81) was recorded at location 1 in May, whereas all samples were in medium water quality range. The results were analyzed based on location and time. A mathematical model was developed with an additional parameter: Electric Conductivity (EC). The validation of the model was done by comparing the WQI values obtained from four previous studies and WQI values obtained from mathematical model which was calculated from raw data of selected studies. The accuracy of the model was recorded between 86% to 92%. Ultimately, this model can be used to predict the water quality of any river in Sri Lanka.
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