Evaluation of Water Quality of the Bahmaneshir and Arvand Rivers, Iran by the NSFWQI Index

Providing clean and suitable water for drinking, farming and living organisms in the ecosystem is essential. Therefore, qualitative assessment of water resources using qualitative indicators as one of the most suitable methods for managing water areas and having a regular program for water quality protection is essential. In this research, the quality of water from Shahid Bavi and Samen Al-Aeme Stations on the Behmanshir River and Dreifam Station on the Arvand River have been used by the National Institutes of Health (NSFWQI) index and using nine qualitative parameters such as turbidity, temperature, fecal coliform, phosphate, nitrate, PH, DO, TS and BOD. In the present study, due to the ease of calculation, the Water Quality Calculator software was used to calculate the NSFWQI index. After collecting data and performing the NSFWQI index analysis, the results of this study showed that during the summer and winter seasons in Shahid Bavi and Samen Al-Aeme stations on the Behmanshir River and Dreifam Station on Arvand River, the NSFWQI index for all months and mentioned stations were in the range of 25-50, which according to the standard classification table, this range of the NSFWQI index, indicates the weak quality of water in these rivers. Also, the EC index for all months and above stations was above the 2250, which indicates the bad status of the EC in these rivers.