Water quality assessment of Diyala river in Diyala province, Iraq

Water quality of natural lotic systems became important due to the water scarcity in most regions. This study conducted to assessment of water quality of the Diyala river as one of the Tigris river tributaries for the period from for four seasons. Three sites were selected along the river and eight environmental factors were chosen for this purpose as follow: water temperature, pH, total dissolved solids, dissolved oxygen, biochemical oxygen demands, total alkalinity, total phosphorus and total nitrogen. The results showed that the river water quality ranged from poor to marginal for the protection of aquatic life