The study explains water quality of three important tributaries of the Ganga River in the middle Gangetic plains in India. Seasonal changes in the water quality of the studied rivers: Gandak, Ghaghra, and Sone were observed. During monsoon, several water quality parame-ters show considerable changes due to increased runoff from the catchments and other seasonal factors. Multivariate discriminant analysis delin-eated a few parameters responsible for temporal variation in water quality. Seasonal variation in water quality of the Gandak River was rendered by seven parameters—turbidity, sulfate, pH, phos-phate, water temperature, total alkalinity, and sodium, while total alkalinity and water tempera-ture were responsible for seasonal discrimination in water quality of Ghaghra River. Water temper-ature, turbidity, total dissolved solids, total sus- pended solids, calcium, and phosphate were im-portant for seasonal discrimination in water qual-ity of Sone River. The seasonal changes in water quality of the rivers were due to seasonal effects and catchment characteristics. The discriminant functions classified most of the cases correctly.
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