Abstract
The water quality index was developed mathematically to evaluate the water quality of Al-Gharraf River Thi Qar, the main branch of the Tigris River in the south of Iraq. Water samples were collected twice month from two stations during 2017, and ten parameters were analyzed: total dissolved solids, the concentration of hydrogen ions (PH), dissolved oxygen (DO), turbidity (TUR), phosphates (SO), nitrates (NO3), chlorides (Cl), total hardness, electrical conductivity and alkalinity. The index classified the river water is poor for drinking, excluding turbidity at both stations. When turbidity was included the index classified the river water is very poor in station GT2 and poor in station GT3 for drinking purpose. The results show that the seasonal variations are negligible in both stations. The study highlights the importance of applying the water quality index which indicate the total effect of the ecological factors on surface water quality and which gave a simple interpretation of the monitoring data to help local people improving water quality.
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