Abstract
In this paper, the fuzzy dynamic programming model is proposed for the planning of sewerage systems. This model decides both the district and the stage to construct the sewerage systems so as to maximize the total reduction of pollution load during planning period, and it supports the reasonable construction of branch sewers that need a long time. In addition, this model provides the planning scheme with robustness and also evaluates the uncertainty in the future considering the sanitary sewerage flow caused by future population as fuzziness. Furthermore, through the comparative analysis and the case study, the feature of this model is made clear and its availability is shown.
