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Wastewater Collection and Water Distribution System Linear Assets Renewal Modeling: A Case Study

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Water distribution, treatment, wastewater collection and conveyance systems constitute a major portion of the asset portfolio for most utilities. Failing water and wastewater infrastructure can pose a significant threat to public health and the environment; and must be strategically timed for rehabilitation and replacement when considering whole of life costs. Advanced asset management techniques allow the prioritization of short, medium, and long–term asset rehabilitation and replacement expenditure. In this paper, we present a case study of the development of an asset management plan for Austin Water Utility (AWU) using a comprehensive multi-criteria decision making renewal investment planning model. The final objective of the modeling effort was to produce a future investment profile for the asset portfolio that takes into account risk, condition, operations and maintenance costs, levels of service (multi-criteria decision making) while prioritizing rehabilitation and renewal decisions. This paper will outline the asset management drivers, process and results of an initial asset management planning effort by AWU. The focus of this paper will be on the investment modeling approach and methodology adopted for developing the future expenditure projections for the utility.
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Keywords: Renewal; capital investment; decision-making; economic life; end of asset life; optimized renewal decision-making; physical life; service level life

Document Type: Research Article

Publication date: 01 January 2011

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