Evaluation of Water Quality in Zarrineh-rood River Using the Standard Quality Index of Iran's Surface Water Resources

Zarrineh-rood River is one of the most important and longest rivers within Orumiye water basin. According to the major drinking use from the river and since the river is receiving different pollutants (natural and artificial) throughout the year, so the water quality control is of great importance. In this research a newly-developed water quality index, the IRAN Water Quality Index for Surface Water Resources-Conventional Parameters Index (IRWQISC index) is used which deals with 11 parameters and presents the result in seven ranges (very bad, bad, moderately bad, medium, moderately good, good and very good). For this study, data from 16 stations in four seasons of the year is used. Results show that no station in none seasons is in range of very good and very bad, and only station 16 in spring is bad. Other results are reported to be in ranges of moderately bad, medium, moderately good and good. As approved advantages to other indices, this index is highlighting the effects of EC and is employing weighted parameters related to domestic wastewater.