A Type-2 Multi-Criteria Decision Making Approach For Flood Control Project Selection

Flood control project is a complex issue which takes economic, social, environment and technical attributes into account. Selection of the best flood control project requires the consideration of conflicting quantitative and qualitative evaluation criteria. When decision-makers' judgment are under uncertainty, it is relatively difficult for them to provide exact numerical values. The type-2 fuzzy set is a strong tool which can deal with the uncertainty case of subjective, incomplete, and vague information. It is easier for a flood control project expert to make an evaluation by using the type-2 linguistic terms. In this paper, a modified fuzzy TOPSIS methodology is proposed for the selection of the best flood control project alternative. TOPSIS is a multi-criteria decision making (MCDM) technique which determines the best alternative by calculating the distances from the positive and negative ideal solutions according to the evaluation scores of the experts. In the proposed methodology, the weights of the selection criteria are determined by fuzzy simple additive weighting (SAW) and the linear programming in the aggregating state. The methodology is applied to a flood control project decision-making problem.