Roghayeh Yousefi - Ph.D. student, School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran,
Nasser Talebbeydokhti - Professor, School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran,
Mohammad Reza Nikoo - Assistant Professor, School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran,

MCDM is a complex decision-making tool and involved quantitative and qualitative criteria. In recent years, several methods have been proposed to aid Decision Support Systems for selecting the best compromise alternative especially in management problems. Two of the most efficient methods for this purpose are PROMETHEE II method and TOPSIS method that are used in this study and due to the uncertainties in the qualitative criteria, grey numbers are used. The management scenarios of Karun River are ranked and compared by these methods and the results were shown that these methods are similar in ranking approximately but different in steps of method and time spending.

Comparing, PROMETHEE II, Grey TOPSIS, Karun River