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SURMALYAN VARDUHI RIVER WATER QUALITY FOR SOUTHWESTERN PART OF LAKE SEVAN PHD THESIS SUMMARY Assessment and analysis of water quality in rivers falling into the Lake Sevan, a summary of the factors affecting water quality, control and efficient management is an actual problem. In RA determination of background concentrations for each of the rivers and creation of a new classification system based on their own background concentrations is an urgent problem. The aim of the thesis is evaluation and classification of Dzknaget, Gavaraget, Shogvak, Tsakkar, Lichq, and Argichi rivers water quality with Canadian, Malaysian, Oregon, Combinator indices, definition pollutants group and water quality factors affecting. For the rivers Dzknaget, Gavaraget, Shogvak, Tsakqar, Lichq, Argichi acceptance of water quality norms considering the norms intended for Gavaraget and the acting ones. Separation of natural and anthropogenic changes affecting water quality in rivers with different sources. Developed a new classification system for water quality assessment Gavaraget based on background concentrations of water-quality Gavaraget. The quality of water is estimated by new classification system based on the power supply and the similarity of the hydrochemical composition: The rivers of Lichq, Tsakqar, Gavaraget-Gavaraget norms and Shogvak, Argichi Argichi-norms. For index calculation and classification instead of the acting newly developed rules for the studied river water quality standards were used and on the bases of that standards groups of polluters were defined. The natural and anthropogenic pollution of water quality changes was divided according to the hydrological season. For the assessment and classification of water quality of the south-western part, Lake Sevan basin rivers it was proposed to a group, for each of them fix their norms. To obtain data of high precision and determination of background concentration the necessary sampling frequency was estimated. For the parameters differing with seasonality for different hydrological seasons the new water quality standards developed. The higher contamination was observed in the river Gavaraget in 2005-2010. The livestock and domestic sewage had the major share of pollution causing factors in terms of recreational water use the highest water quality was observed in the river Dzk naget, in terms of irrigation al-in the river Tsakqar. The Tsakqar, Argichi river's water applicable for with low requirements water quality uses. Gavaraget water quality is only suitable for with no requirements water quality uses, such as energy production. With new classification system based on background, concentrations was given a tougher water quality classification. It was separated groups of indicators with similar behavior with underground origin (V. Se), with surface and underground origin (Fe. Ti, B. Na. Cl), polluting the environment (Cu, Sb, Cr, N. P. BOD5). It was shown that there is a direct link between parameter's concentration values and Dzknaget river flows in case Al, Cu, Mn, V, Cr, Se, Sb, Ti, Argichi-Al, Gavaraget-Cu, Mn, V. Cr, Ti, for the river Argichi there is a reverse link in case of Na, K parameters.