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Subsequent realization of the significance of diffuse sources necessitated the need for assessing the impact of land use characteristics on river water composition with alternative methodological approach. This study collected water samples from Saka River basin and the concentration of major ions were analyzed. Proportion of land uses of the respective drainage basins were calculated from GIS data. The results were analyzed with the objective to find out the relationship between land use characteristics and water chemistry. Forest dominated sub-watersheds showed lowest ion concentrations. As the urbanization progressed, sub-watershed became to contain more ions. Urbanization induced positive significant relationships with Na,K,Ca,Mg,Cl,SO4,TMI (Total Major Ions), while farmland with K, SO4,TMI, and Industrialization with Na+,K+,Cl,TMI. These trends are distinguished more clearly using hexadiagram of the ion concentration and PCA scores for the sub-watersheds.

RELATIONSHIP BETWEEN LAND USE AND RIVER WATER QUALITY IN THE URBANIZING AREA OF THE SAKA RIVER, WESTERN PART OF THE SHIMOUSA UPLAND