Due to the developments in the field of computer sciences, recently numerous models have been developed for hydrodynamic and water quality assessment in waterbodies. Among these models, the two-dimensional laterally averaged CE-QUAL-W2 has received considerable attention worldwide and has become a commercial model in the recent decade. Considering the model\\\\\\\\\\\\\\\'s abilities and the need to study the Doosti dam, the present study examines the water quality pa-rameters of the Doosti dam Reservoir, such as phosphorus, Nitrate, etc., over a year-long period. The model was calibrated and yielded satisfying results espe-cially in the case of water temperature. Here the results for the period 2013 to 2014 have been presented. The results showed a three-month thermal stratifica-tion in the reservoir. Also, results of quality parameters showed that the Doosti dam reservoir is in danger of eutrophication.

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