Abstract
This study was conducted to investigate the effects of the Diyala Tributary on the physical – chemical factors of the Tigris River. A water sample was collected monthly from five sites. Site 1 was located on the Tigris River before joining the Diyala with Tigris River, site 2 was located on Diyala River, site 3 was located on the Tigris River after 500m from joining area of Tigris with Diyala River, Finally site 4&5 was located 3, 5 Km of site 3 respectively downstream Tigris River. The results of this study illustrated that the variations in the values of turbidity and the total suspended solids in the Tigris River and Diyala Tributary were not sharp, whereas there was clear effect of Diyala Tributary by raising the values of the electrical conductivity, salinity, TDS, BOD5, total hardness, bicarbonate, sulphate of the Tigris River. Also there was an increase in the phosphate and nitrate concentrations with depletion of dissolved oxygen at site 2 which located on Diyala Tributary that affected on Tigris River significantly.
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