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Evaluation of Karun River Quality for Irrigation in Khuzestan Province of Iran and Statistical Relationship of TDS and EC in Classified Flow Rates. Karami O, Hooshmand A, Bazargani S, Lamei M. J. Civil Eng. Urban., 5(5): 226-234, 2015; pii:S225204301500035-5 Abstract Hydro-Chemical Studies that using regression tests would be efficient operational to save the time and cost, If the regression tests confirm the correctness of regression analysis. In this study, Total Dissolved Solids (TDS) and Electrical Conductivity (EC) of Karun River that are varies by flow rates of river, has been separated in three categories, less than 400 Cubic Meters per Second, between 400 and 800 CMS and more than 800 CMS. TDS and EC rate data were analysed using SPSS 18.0 with linear regression model from October 1971 to September 2012. Correctness of estimated values of TDS which estimated with obtained regression equations was evaluated using the t-test, in these way residuals of obtained regression equations should be distributed normally around zero. The values of Sodium Absorption Ratio and Electrical Conductivity of water of Karun River were plotted in the US salinity laboratory diagram for irrigation water in three categories. For classified discharges, respectively about 64.5%, 91.8% and 78.7% of the water samples fall in the field of C3S1, will indicate low sodic waters. The water will cause high salinity hazards with a fairly severe effect on the soil properties, but are suitable for irrigation purpose which requires special careful application. Keywords: EC, Flow Rate, Hydro-Chemical, Regression, TDS, USSL. [Full text-PDF] منبع: [Hidden Content] J. Civil Eng. Urban., 5 (5) 226-234, 2015.pdf