Study of the quality and validity of the water of the River Tigris (Al-Gharraf stream) within the city of Nasiriya- Iraq

Despite the importance of water for life, drinking, irrigation, power generation and industrial use. This study concerns the study of the quality and validity of water by applying the arithmetic weight index (AWI) for the water quality of irrigation , where the selection of the eleven variables acidity (PH), Total Dissolved Solid (T.D.S),  Alkalinity(ALK), Electrical Conductivity (E.C), Calcium(Ca), Chloride (CL), Sodium (Na), Sulfate (SO4), Potassium (k), Total suspended solids (T.S.S), Total hardness (TH) to show the water quality  of the study area