SEASONAL VARIATION IN WATER QUALITY OF WEIR CUMCAUSEWAY, TAPI RIVER (INDIA)MONIKA DUBEY AND N.C. UJJANIAAbstract In the present study, an attempt has been made to explain the effect of seasonal changes and pollutants on physico-chemical characteristics of river Tapi water in reference to weir cumcauseway. This study was conducted for one year from December 2012 to November 2013 and important water quality parameters (temperature, pH, dissolved oxygen, turbidity, conductivity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, nitrate-N, nitrite-N, ammonia, total hardness, fluoride, chloride, total alkalinity, phosphate, sodium, potassium) were analysed. The seasonal observations were compared with water quality standards and found beyond during winter (turbidity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, ammonia, phosphate, potassium), summer (turbidity, biological oxygen demand, nitrite- N, ammonia, phosphate, potassium), monsoon (turbidity, biochemical oxygen demand, chemical oxygen demand, nitrite-N, ammonia, phosphate, potassium) and post-monsoon (turbidity, biological oxygen demand, chemical oxygen demand, ammonia, phosphate, potassium ). The result of this study depicted that weir cum-causeway of Tapi River observed polluted but it is heavily polluted during winter and monsoon season due to industrial, domestic sewage pollution and agriculture runoff.
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