Water Quality Assessment of Surface and Ground Water Resources in Naghadeh- Oshnavieh Plain

Qualitative assessment of water resources is one of the main topics in hydrology. In order to evaluate the trend of water quality changes using physical and chemical parameters in 21 surface water monitoring stations and 33 groundwater resources stations using IRWQI, NSFWQI, WQI, OWQI, CWQI, DWQI and WPI quality indicators in the period Statistical analysis of 2012-2013. Water quality status according to NSFWQI, WQI, WPI and OWQI indices was the same for surface and groundwater resources and was in the middle, excellent and very poor quality classes. Also, the average quality status in IRWQISW and IRWQIGW indices, poor condition of CWQI and DWQI indices in surface water sources and good and excellent condition in CWQI and DWQI indices for groundwater resources were evaluated, respectively. In surface water sources, Sheikhan Chai (6), Kani Rash (9), Balqachi Chay (15 and 16), Mohammad Shah (19) and Godarchai (20) stations were identified as the most polluted stations, which is the parameter of total solids. Suspended (90.4%) had the highest impact percentage in station 9 and was polluted in groundwater resources of Nizamabad (23), Farrokhzad (27), Azim Khanlu (28), Adeh (31) and Mamind (32) stations. The most stations were the phosphate parameter (58.3%), which had the greatest impact on reducing water quality in station 23. The results show that the WPI index is appropriate for estimating surface and groundwater quality.