Decision Support Model for Integrated Intervention Plans of Municipal Infrastructure

摘要

This paper describes a model designed to facilitate the decision making process for corridor rehabilitation of municipal assets. The proposed model comprises four main modules encompassing identification of corridor segments, risk assessment of individual asset networks and integrated risk assessment to identify critical corridor segments and set priorities for intervention plans. In general, risk assessment requires integration of the criticality of the asset condition and the consequences of failure values to prioritize intervention plans. Each asset network was evaluated with respect to thirteen economic, social, and environmental factors using a weighted scoring system. The criticality index of each asset was developed by combining the consequence of failure index with the condition rating index. The integrated risk index for network segments was calculated by integrating the three criticality indices of the individual assets. A case study, from one of the 19 boroughs within the metropolitan area of the City of Montreal in Canada, was used to illustrate the developed modules and their respective functions. The results indicated strong positive relationship between the integrated risk index and the criticality indices of the three networks. It also shows that the model successfully represents the integrated criticality index for the combined water, sewer and road segments using their criticality indices as the coefficient of determination R~2 was 0.9656. The implementation of the proposed model on the case study enabled condition rating of integrated segments into five main levels of criticality. The developed model is expected to assist municipal engineers and decision makers to prioritize inspections, rehabilitation and replacement decisions and optimize budget allocation and resource usage.