Abstract
Infrastructure stock that was acquired rapidly during Japan’s period of high economic growth presents challenges for management to avoid negative impacts from facility aging, such as sewer pipe breakage, under conditions of tightening public works budgets. The authors present a conceptual framework for managing the maintenance and replacement of infrastructure, using combined sewers as a reference. A risk evaluation is used to obtain an annual cost of not replacing the infrastructure; this cost is then combined with the societal cost (internal cost of construction or maintenance work plus economic externalities derived from environmental and social impacts) of performing routine maintenance or replacement based on different replacement periods from 5 to 90 years. We show that given such a full consideration of costs, replacement periods for sewers in densely populated areas may be closer to 30 years than the general assumption of 50 years.
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