H. Fakhraei - MSc. Student, Civil and Environmental Engineering Department, Shiraz University, Shiraz, Iran
A. Karimi-Jashni - Assistant Professor, Civil and Environmental Engineering Department, Shiraz University, Shiraz, Iran

In this study spatial and monthly measurements are done along the course of the Kor and Sivand Rivers, encompassing all the parameters needed to quantify the WQI for these rivers. The WQI of the upstream of the Kor River at the dry season is classified as medium, which dwindled in the plains, due to the seepage from the Shiraz petrochemical complex, effluent of municipal wastewater of Marvdasht City, discharges from the Kohesabz and Ahochar Drainages and farm lands. The WQI degrades further to the fair state, during the dry season at the downstream especially where the Sivand River joins the Kor River. Sivand River itself goes with the same trend, having a medium WQI at the upstream, which degrades drastically to fair at its junction with the Kor River.

Water quality index (WQI), river water pollution, Kor River, Sivand River