ABSTRACT
ABSTRACT: A pro-active water mains rehabilitation approach is more cost-effective than a reactive one. However the pro-active rehabilitation requires a effective decision making tool to allow it to be cost-effective. Therefore, there is a need for decision making tool to prioritize water mains rehabilitation scheme. This paper presents a decision making tool for ranking the condition of pipe with available, inexpensive, but vague or imprecise data. Possibility approach has been used to account for the uncertainties inherent in pipe condition indicators, and distance based multiple-criteria decision making approach has been employed to combine the pipe condition indicators according to their similarities. The decision making tools developed that ranks the pipes in terms of their condition. Sensitivity of the model to weights and balance factors has been studied and it has shown that the proposed model is robust. It is anticipated that the developed model will assist engineers in prioritizing pipe rehabilitation scheme.
