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Sustainability 2018, 10(6), 1987; https://doi.org/10.3390/su10061987

Reviewing the Long-Term Sustainability of Urban Water System Rehabilitation Strategies with an Alternative Approach

1
Department of Water and Environment, Norwegian University of Science and Technology, 7491 Trondheim, Norway
2
Multiconsult, 0276 Oslo, Norway
*
Author to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 7 June 2018 / Accepted: 12 June 2018 / Published: 13 June 2018
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Abstract

It is generally difficult to assess the performance of an infrastructure with a substantially longer life span than economic models can handle, and the life cycle concepts in urban water systems are normally limited to single-asset projects. In order to explore the long-term impact of urban water infrastructure rehabilitation strategies, a life cycle approach for survival functions is suggested. A life cycle factor based on survival functions is introduced, which is a measuring value of the total expected service life of all pipes within a group of pipes. Another factor, termed the sustainability factor, is based on the relationship between the life cycle factor and a rehabilitation reference method, which makes it possible to correct the long-term performance of rehabilitation methods based on their expected service life provision. A case study presents the implications for investments in infrastructure rehabilitation when applying the sustainability factor in long-term planning, and shows the importance of considering the service life of rehabilitation methods when planning renewal interventions that minimize costs over their life cycles. View Full-Text
Keywords: strategic asset management; sustainability; life cycle; long-term planning; rehabilitation strategy strategic asset management; sustainability; life cycle; long-term planning; rehabilitation strategy
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Bruaset, S.; Rygg, H.; Sægrov, S. Reviewing the Long-Term Sustainability of Urban Water System Rehabilitation Strategies with an Alternative Approach. Sustainability 2018, 10, 1987.

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