Study of the effect of agricultural and domestic pollutants on the water quality of the Diyala River in Iraq

This study was conducted to assess the effects of agriculture and domestic pollutant on the quality of the Diyala River. Water samples and fish samples were taken bimonthly at three stations in Diyala River and18 parameters (air and water temperature, TDS, dissolved oxygen, BOD, pH, EC, No2, NO3, total PO4, heavy metals (Cd, Pb, Al) in water and heavy metals (Cd, Pb, Al) in fish sample) were analyzed. The river has a total length of 574 km and a drainage area of which 25% is in Iran and 75% is in Iraq, Results of the study indicated that the Diayla River is more polluted and this is confirmed by Physico-chemical properties, as well as the carp fish was one of the most local fish sensitive to water pollution, especially heavy metals (HMs). The model gave a good idea to assess the water quality of the Diyala River under the effect of dryness and large quantities of pollutants on it