Evaluating of the Gharraf river water Thi Qar southern Irarq using the water quality index (WQI)‎

الملخص EN

The Water Quality Index was developed mathematically to evaluate the water quality of Al-Gharraf River The Qar , the main branch of the Tigris River in the south of Iraq.

Water samples were collected twice monthly from tow stations during 2017, and 10 parameters analyzed: Total dissolved solids(TDS), the concentration of hydrogen ions(PH), dissolved oxygen(DO), turbidity(TUR), phosphates (SO4), nitrates (NO3), chlorides (Cl), total hardness, electrical conductivity(EC) and alkalinity (ALK).

The index classified the river water , excluding turbidity, is poor for drinking 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 purpos.

The results showed thae 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 give a simple interpretation of the monitoring data to help local people improving water quality improving .