Evaluation of the water quality of Shorbarik River based on quality indicators of surface water in Haftkal city, Khuzestan province

Rivers are one of the most important water sources that play an important role in providing water needed for various activities such as agriculture, industry, drinking and electricity production. Many of the water resources planning in the countries are based on the potential of surface water resources. Therefore, knowledge of the quality of water resources is one of the important requirements in planning and developing water resources and their protection and control. Used water considering the importance of the Shurbarik River for the use of the people of the surrounding villages, in this study, the water quality of the Shurbarik River was determined using water quality parameters. In order to achieve the objectives of this study, the parameters of dissolved oxygen, pH, biologically required oxygen, chemically required oxygen, temperature, phosphate, nitrate, ammonium, turbidity, total dissolved solids and electrical conductivity were investigated in four seasons. Based on the average NSFWQI index, the water quality of Shobarik River is in the bad quality category. The range of this index is between 29.9 to 35.4 in all seasons. The average of this index is the lowest in summer and the highest in winter. Based on the average IRWQISC index, the water quality of Shobarik River is in the bad quality category. The results related to the value of the Liou index also show that the numerical value of this index is in the range of 3.25-4.25, which indicates the relatively polluted quality of water from the point of view of this index in all seasons. Contrary to the differences in the parameters and methods used to calculate the indicators, the results of all methods are consistent and are very useful for evaluating water quality.