The study reports the seasonal changes in water quality of Al-Gharraf, one of the main tributaries of the Tigris river. Monthly sampling was carried out from December 2015 till November 2016 for a year. The study location situated in the south-eastern sector of Iraq and surrounded by wide and fertile agricultural lands. Three stations were selected to. The former is located at 5 km before entrance of AL-Hayy City as control. The second is situated at distance 5 km away from the former (mid of ALHayy City) represented study area and the latter station is located at 15 km apart from the second one (end of AL-Hayy City). collecting samples monthly ,two samples were taken each month.In the present study Fourteen physical and chemical parameters were analyzed based on the importance of these parameters. These Fourteen parameters are ranged as following: air temperature (16 to 32) ºC, water temperature (11 to 26) ºC, pH (7. The study results also showed that the heavy metals concentrations (cadmium and lead) were 0.002-0.089 ppm and 0.031-0.21 ppm respectively. Concentrations of these metals of Al-Gharraf River showed seasonal variations during the study period and they are exceeding permissible limits for Iraqi standard specifications and WHO standard for drinking.The highest bacterial count was recorded at sit.2 the during winter 2016, 2800 cell /1 ml , whereas the lowest value was found during summer 2016, 320 cell /100ml. whereas numbers of E.coli were (230-1700) cell/10ml. Key Words: physic -chemical and biological parameters, water quality, Al-Gharraf river. التربية كلية مجلة والعشرون التاسع العدد IntroductionRivers have always been the most important fresh water resources, and most developmental activities are still dependent upon them. Rivers play a major role in assimilating or carrying industrial and municipal waste water, manure discharge and runoff which are responsible for water river pollution[1] [2]. The degree of pollution is generally assessed by studying physical and chemical characteristics of the water bodies [3]. Iraqi inland waters witness tremendous impacts through discharges of manufacturers, agricultural and domestic sewage [4] [5]. Quite few studies were performed on Tigris River [6] [7] [8], but no work had considered Al-Gharraf canal in Al-Haay City. The present study has taken in consideration the investigation of abiotic conditions in this vital habitat on monthly basis.
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