Evaluation of Irrigation Water Quality Index for Tigris River and Pollution Levels of Heavy Metals in Baghdad

This research was contented to use Irrigation Water Quality Index to classify Tigris River for city of Baghdad and pollution by. heavy metals. Four sites were chosen along the Tigris River in Baghdad,( Taji, Gherai'at, Doura and Jisr Diyala). Water samples were taken from October 2017 to June 2018,one sample per month. The result of Irrigation Water Quality Index for Gherai'at, Taji and Doura showed that highest values were(77.63,77.43and77.36)respectively, lowest and the valueswere (72.58, 72.03and 64.87)respectively. However, it's were Low restriction (S2) while Jisr Diyala site was a highest value is 47.97 and the lowest value 38.31, however it were between Moderate restriction (S3) and High restriction (N1). Also the results showed that heavy metal pollution by Lead (Pb2+) and Zinc (Zn2+)were within the maximum limits it were highest values 3.310and 0.92mg.L-1 respectively, on the other hand Cadmium (Cd2+) and Nickel (Ni2+) werelowest values 0.127 and 0.211nng.L(-1)have the advantage in terms of the permissible limits set by WHO.