Abstract
Seven stations along the Euphrates River were selected for studying the behavior of some hydrochemical indicators including pH, TDS, total alkalinity, nutrients (PO4 and NO3), and dissolved oxygen (DO) for the period 2004–2010. Most of these indicators show significant increasing trends. It was also observed that increasing the values of these indicators showed downstream directions. This is due to the increase of the uses of the river water as well as the decrease of the overall incoming water quantities due to the establishment of various new hydraulic projects in the upstream countries especially in the last years. Grouping results show that Qaim, Hit, and Hindiya stations were grouped together. The remaining stations were assembled in another group. Hydrological and geological conditions and anthropogenic effects are the main controlling factors on the behaviour of the selected indicators.
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