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Poster De Conférence Année : 2009

Condition grade assessment of sewer segments using crisp and fuzzy calibration procedures

Evaluation de l'état de conduites d'assainissement à partir de procédures de calibration floues

Résumé

Asset management is an increasing concern for wastewater utilities and companies. Indicators are developed for supporting the definition of investigation and rehabilitation programs. These indicators are mostly based on visual inspections, which provide major information. However, difficulty remains in the translation of a visual inspection survey into dysfunction indicators. Condition grade of a sewer segment may be obtained by comparison of a single score to thresholds which must be in accordance with practices or opinions of utilities' experts. Concerning this single score, there is a common agreement on using mean score which corresponds to the density of disorder and protocols such as WRc or NRC (Rahman and Vanier, 2004) offer useful scales of numerical values. However these scales are permanent and cannot be adapted to each specific utility. That is to say these scales will not change depending on the global condition of the utility's asset. In this paper, we propose and illustrate two different methods for establishing the scale of numerical values, in order to determine thresholds between each sewer segment condition grade.
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Dates et versions

hal-02592756 , version 1 (15-05-2020)

Identifiants

Citer

F. Cherqui, P. Le Gauffre, C. Werey. Condition grade assessment of sewer segments using crisp and fuzzy calibration procedures. 3rd Leading-edge conference on strategic asset management, LESAM 2009, Nov 2009, Miami, United States. AWWA and IWA, pp.1, 2009. ⟨hal-02592756⟩
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