An investigation of the factors influencing sewer structural deterioration

Ana, Eliseo; Bauwens, Willy; Pessemier, Mieke; Thoeye, C.; Smolders, S.; Boonen, Ivo; Gueldre, G. De

doi:10.1080/15730620902810902

Cited by 70 publications

(58 citation statements)

References 14 publications

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“…In this last report it was noted that it was interesting to perform a comparison between the City of Edmonton's protocol and that of WRc. Other reports perform similar comparisons among protocols in varied locations or propose alternate condition assessment methods (Ana et al 2009;Khan et al 2009;Chughtai and Zayed 2011;Opila and Attoh-Okine 2011).…”

Section: Introductionmentioning

confidence: 88%

Comparative analysis of sewer physical condition grading protocols for the City of Edmonton

KhazraeializadehSoroush

GayLeon

BayatAlireza

2014

Can. J. Civ. Eng.

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Condition assessment is a key component of successful asset management, and many diverse condition assessment protocols exist for sewer mains. These protocols are used to generate condition grades for sewer mains after inspection. Condition assessment protocols are important because renewal actions for sewers are prioritized based on condition grades. If condition grades assigned to sewers do not reflect actual pipe conditions close enough, the resulting allocation of resources will not be the best. This paper presents a comparison of three possible sewer condition assessment protocols for the City of Edmonton: the Pipeline Assessment and Certification Program quick grading method, the Manual of Sewer Condition Classification fourth edition, and the City of Edmonton's Sewer Physical Condition Classification Manual. The results show that structural sewer condition grades depend significantly on the protocol used; therefore, protocol selection has significant financial consequences for asset management programs in the city.

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Section: Introductionmentioning

confidence: 88%

Comparative analysis of sewer physical condition grading protocols for the City of Edmonton

KhazraeializadehSoroush

GayLeon

BayatAlireza

2014

Can. J. Civ. Eng.

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“…Some interviewees stated that is it very likely their conclusions about replacement need, based on pipe age and inspections, may vary from day to day. Research showed however, that pipe age combined with camera inspections are insufficient to conclude about these aspects, because knowledge about deterioration processes is still limited (Baur and Herz 2002, Stone et al 2002, Chughtai and Zayed 2008, Ana et al 2009, Dirksen et al 2012.…”

Section: Intuition In the Decision Processmentioning

confidence: 98%

“…Pipe level models consider individual pipe deterioration modelling, and pipe group models consider deterioration of cohorts. Unfortunately, both model types are limited in their prediction of the structural condition of sewer pipes, because of the complexity of pipe deterioration processes and the lack of data (Chughtai and Zayed 2008, Ana et al 2009, Ana and Bauwens 2010, despite the research carried out so far. Because the analytical tools and models as well as the required data are limited both in quantity and quality, significant uncertainty is introduced for decision-making (Korving 2004, Dirksen et al 2013.…”

Section: Introductionmentioning

confidence: 98%

Intuition and information in decision-making for sewer asset management

Riel

Langeveld

Herder

et al. 2014

Urban Water Journal

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Decision-making for sewer asset management is inherently complicated, because of limited data and interaction with multiple actors, making it neither transparent nor reproducible, mostly based on intuition. It is unclear which and how information sources and intuition are used for sewer pipe replacement decisions. Therefore, this study assesses the use of information and intuition in decision-making for replacement decisions. Next to that, the success of the intuitive decisions is addressed. Interviews were conducted at seven municipalities in the Netherlands, combined with analyses of their strategic municipal sewerage plans. Content analysis identified twenty-one information sources used in intuitive risk analyses considering the following five aspects: pipe collapse, insufficient hydraulic performance, nuisance to citizens and related reputation of the organization, traffic disruption, costs for excavation and costs for surface level reconstruction. Given the complex context of sewer asset management and limited data, intuitive decision-making is favoured, but is however not skilled.

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“…Avec le temps, les conduites d'égouts subissent des détériorations qui sont d'autant plus rapides que la conduite est mal entretenue et (ou) que le sol environnant est agressif. Plusieurs études ont réalisé des évaluations de la détérioration de la performance structurale (Ana et al 2009a(Ana et al , 2009bKhan et al 2010;Younis et Knight 2010).…”

Section: Performance Structuraleunclassified

Le « goal programming » pour l’optimisation de la planification de la réhabilitation des réseaux d’égout

Tagherouit

Bennis

2012

Can. J. Civ. Eng.

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La planification de la réhabilitation des réseaux d'égouts, qui sont le siège de mises en charge, de débordements et d'inondations intempestives, est un problème complexe qui nécessite le développement d'outils qui intègrent de nombreux paramètres influençant l'état des conduites. En général, seuls les aspects structuraux sont pris en compte dans la planification de la réhabilitation des réseaux de drainage. Dans cette étude, l'intégration des deux aspects (structural et hydraulique) de performance est considérée. La méthodologie proposée sélectionne la démarche de réhabilitation adaptée à chaque tronçon afin de minimiser l'écart global par rapport aux niveaux de performance structurale et hydraulique ciblée tout en respectant un budget alloué. Le « goal programming » a été utilisé comme méthode de résolution du problème multi-objectif. La méthodologie a été testée sur le réseau du secteur 1 de Verdun, un arrondissement de Montréal. Les résultats montrent l'applicabilité de la méthodologie et son succès.Abstract: Sewer rehabilitation planning is a complex problem that needs the development of some tools that facilitate the integration of many factors and parameters influencing the status of sewer pipes. Generally only the structural aspects are considered in the rehabilitation planning and sewer degradation studies. Some studies that integrate the hydraulic performance do not consider the real responsibility of each pipe in the surcharges or they only introduce a prioritization without considering the economic factors or the suitable rehabilitation method to use. In this study, an integration of two aspects (structural and hydraulic) of the performance of sewer pipes is considered and the planning over a time horizon is presented. The proposed methodology selects the suitable rehabilitation method for each sewer pipe in order to minimize the overall deviation from the desired structural and hydraulic performance levels within a limited budget. The methodology requires, on one hand, the standard structural classification of the pipes, which is considered in the computation of the initial structural performance. On the other hand, the global hydraulic performance of each conduit is calculated by computing the runoff flows at its entry. These flows are then considered to evaluate the real capacity of the pipes as well as their corresponding performance indexes. An optimisation model is then developed in order to determine the suitable rehabilitation method for each pipe that permits to approach the desired hydraulic and structural performance of the system without exceeding the maximum budget. The methodology has been tested on a sewer of the sector 1 in Verdun, a district of Montreal. The results show the applicability of the methodology and its success.

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An investigation of the factors influencing sewer structural deterioration

Cited by 70 publications

References 14 publications

Comparative analysis of sewer physical condition grading protocols for the City of Edmonton

Comparative analysis of sewer physical condition grading protocols for the City of Edmonton

Intuition and information in decision-making for sewer asset management

Le « goal programming » pour l’optimisation de la planification de la réhabilitation des réseaux d’égout

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