Performance-based modelling of long-term deterioration to support rehabilitation and investment decisions in drinking water distribution systems

Bruaset, Stian; Sægrov, Sveinung; Ugarelli, Rita Maria

doi:10.1080/1573062x.2017.1395894

Cited by 14 publications

(12 citation statements)

References 13 publications

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“…This amount of pipes in operation = 1 − amount of pipes that have been rehabilitated. The Herz function was originally designed by Herz [7] in 1996, and is explained in full detail in Bruaset et al [42].…”

Section: Herz Functionmentioning

confidence: 99%

“…Large et al [54] explain the concepts of left truncation and right censoring, and propose a method to correct historical data for these concepts based on an extensive process to build an empirical Turnbull survival function. Bruaset et al [42] propose a method to improve survival functions, as opposed to the other methods, which includes a way of adapting survival functions to historical and desired future service levels in the network. These three papers present different approaches to calibrate survival functions with historical data, and thereby reduce uncertainty in modelling survival functions.…”

Section: Further Workmentioning

confidence: 99%

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

2018

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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.

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Section: Herz Functionmentioning

confidence: 99%

Section: Further Workmentioning

confidence: 99%

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

2018

Self Cite

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“…[9,10] Survival analysis by pipe failure The useful life of the pipe was determined using the survival rate based on the Herz probability distribution. [11,12] Genetic algorithm for minimizing the life cycle cost…”

Section: Prediction Of Remaining Pipe Thickness and Residual Structurmentioning

confidence: 99%

“…6, the future failure rate was predicted, based on the failure function of the Cohort Survival Model [11]. This failure rate model utilizes statistical methodologies to estimate future pipe conditions over predetermined amounts of time, based on an analysis of the pipe's current condition [12]. To build a standardized model of a pipe's failure history, the failure history of the national multi-regional water supply of the Republic of Korea (Korea) during 1980-2015 was used [28].…”

Section: Benefits Of Pipeline Renewalmentioning

confidence: 99%

Economic-based approach for predicting optimal water pipe renewal period based on risk and failure rate

Kim

Seo

Hyung

et al. 2018

Environmental Engineering Research

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This study suggests a method for calculating the benefits of water pipe renewal based on an estimate of the water supply suspension risk. The proposed method based on five benefit items is more direct and specific than other benefit estimation methods. In addition, a methodology evaluating the economics of pipe renewal based on pipe failure rate is proposed for estimating the optimal renewal point from an economic perspective. By estimating the optimal renewal period based on a yearly benefit cost ratio per pipe in a case study area, it was possible to draft an optimal renewal plan for the subject region from an economic perspective. Compared with other methodologies, a reasonable optimal renewal period was derived from an economic point of view. The result of this study may be used to develop future water pipe renewal plans. Moreover, the proposed methodologies and results derived from this study can be applied to asset management plans.

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“…The second key input is the asset condition assessment, as the likelihood of failures related to service and safety levels increases if condition is not adequately identified [29][30][31]. The problem of deterioration in water distribution networks has been studied by different authors, concluding that extensive parts of existing distribution systems need repair and that those systems needing repair are performing below the acceptable standard [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Condition Assessment of Water Infrastructures: Application to Segura River Basin (Spain)

Urrea-Mallebrera

Altarejos‐García

García

et al. 2019

Water

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The paper deals with the condition assessment of water management infrastructures such as storage facilities, water mains and water distribution facilities. The objective is to develop a methodology able to provide a fast, simple assessment of present asset condition, that can also be used for predicting future conditions under different investment scenarios. The authors investigate the use of different methodologies to assess condition with focus on simple, indirect condition indices based on maintenance records, such as Infrastructure Value Index (IVI) and Asset Sustainability Index (ASI). The novelty of the approach presented is the development of a methodology that combines an asset inventory together with maintenance data, that can be integrated hierarchically, delivering an assessment of condition of elements, assets and groups of assets in a bottom-up fashion. The methodology has been applied to a group of water management infrastructures of the Segura River Basin in Spain. The main conclusion is that the proposed methodology allows to assess assets' sustainability based upon past and current trends in operation and maintenance budgets, providing a baseline for planning future maintenance actions.

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Performance-based modelling of long-term deterioration to support rehabilitation and investment decisions in drinking water distribution systems

Cited by 14 publications

References 13 publications

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

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

Economic-based approach for predicting optimal water pipe renewal period based on risk and failure rate

Condition Assessment of Water Infrastructures: Application to Segura River Basin (Spain)

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