Defining complementary tools to the IVI. The Infrastructure Degradation Index (IDI) and the Infrastructure Histogram (H_I)

Abstract

Defining complementary tools to the IVI. The Infrastructure Degradation Index (IDI) and the Infrastructure Histogram (HI) The Infrastructure Value Index (IVI) is quickly becoming a standard as a valuable tool to quickly assess the state of urban water infrastructure. However, its simple nature (as a single metric) can mask some valuable information and lead to erroneous conclusions. This paper introduces two complementary tools to IVI: The Infrastructure Degradation Index (IDI) and the Infrastructure Histogram (HI). The IDI is focused on time (compared to the IVI, focused on value), represents an intuitive concept and behaves in a linear way. The joint analysis of IVI and IDI provides results in a more complete understanding of the state of the assets, while maintaining the simplicity of the tools. The Infrastructure Histogram allows for a full evaluation of the infrastructure state and provides a detailed picture of network age compared to its expected life, as well as an order of magnitude of the required investments in the following years.

Optimisation models for project selection in asset management: an application to the water sector

“…The considerations about results of IVI for groups of similar components and overall infrastructures are frequent in the literature (Alegre et al, 2014;Cabrera Rochera et al, 2019;Vieira et al, 2020aVieira et al, , 2020b. Those approaches help to focus managers' attention on problematic areas and compare different infrastructures.…”

“…The authors discuss the impact of a set of planned projects on the IVI, but the selection of optimum project portfolios is not explored. Recent works have used the IVI to address future investment scenarios in conjunction with other indicators as the infrastructure degradation index (IDI), developed by Cabrera Rochera et al (2019) and the ASI, introduced by Urrea- Mallebrera et al (2019). Cabral et al (2019) emphasise the economic valuation of assessing and incorporating asset conditions to plan rehabilitation interventions.…”

“…The IVI, proposed by Alegre (2008), has gained global recognition as a valuable tool for characterising water service infrastructure (Alegre and Covas, 2010; Cabrera Rochera et al., 2019; Ramos‐Salgado et al., 2022). The IVI has gained widespread utilisation globally and is increasingly acknowledged as a standard indicator in the water sector, which may be attributed to its simple and intuitive concept.…”

“…The term useful life is widely used in the literature to refer to the technical service life, lifetime or lifespan of an asset. It is the prevailing expression in studies that discuss the IVI employed to describe the duration for which an asset can provide its intended functionality or service(Alegre et al, 2014;Amaral et al, 2016;Cabrera Rochera et al, 2019).© 2023 International Federation of Operational Research Societies.…”

Diseño de una propuesta para la regulación técnica de los servicios de agua en España

“…Como se comentaba previamente, hay pocas medidas que proporcionen una idea general e intuitiva del estado de la red, que permitan conocer el impacto de las distintas estrategias de renovación a largo plazo y que consigan difundir su estado y necesidades de inversión tanto a los responsables de las políticas públicas como a la ciudadanía. Es por ello, que en el marco de este trabajo se han desarrollado dos herramientas complementarias, el Índice de Degradación de la Infraestructura (IDI) y el Histograma de la Infraestructura (HI) (Cabrera Rochera et al, 2019;Estruch-Juan et al, 2020). Ambas herramientas complementan una herramienta que ya existía, el Índice de valor de la infraestructura (IVI).…”