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Communication Dans Un Congrès Année : 2009

Addressing socio-economic and environmental impacts in sewer networks' rehabilitation decision making tools

Résumé

Rehabilitation of sewer networks has to serve various objectives, both in terms of present general performance, and in terms of long term sustainability. Part of these stakes are external to the sewerage utility operation, such as social impacts of sewer failures, or social impacts of works. These external impacts are to some extend considered in real life decisions, and should therefore also be taken into account in decision support systems. CARE-S project (2003-05 EU 5th Framework Program), Computer Aided Rehabilitation of Sewer systems, has developed a decision support environment and software prototype, including data management procedures, a set of performance indicators, models describing the condition and evolution of sewers, models describing the risks and consequences of failures, a database describing rehabilitation technologies with their characteristics, an assessment of socio-economic criteria, a long term planning tool, multi-criteria decision tools. The objective is to help utility managers to rehabilitate the right pipe, at the right time, with the right technology. Criteria concern on one hand impacts during rehabilitation works, criteria used for the selection of the best technique for rehabilitating the concerned pipe in a multi-criteria decision making procedure, on the other hand impacts during a failure, criteria used for the selection of pipes candidates for rehabilitation. We worked out criteria such as time loss due to traffic deviation, economic loss for trades due to accessibility problems during works but also criteria concerning ground water or surface water pollution damages risk during overflow or due to exfiltrations from the pipes. Concerning floods damages in celars during overflow, valuation has taking into account methods used for river flooding damages concerning material goods ( Werey & alii, 2005). A second project INDIGAU Performance Indicators for urban sewer networks asset management (financed by the ANR, French Research Agency, 2007-10) goes further on with the valuation of the impact criteria using methods coming from the environmental economics such as Willigness to pay (Rozan, 2004) or contigent ranking (Hurlimann & Mckay, 2007) recently used for giving a value to intangible damages or impacts such as odors problems or loss of sentimental affect goods such as photographs during floods due to overflows of the networks (Larabi, 2009). In our paper we will present the valuation of such criteria taking into account, social and environmental impacts in a generally technical decision process for sewer networks rehabilitation.
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Dates et versions

hal-00614881 , version 1 (17-08-2011)

Identifiants

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C. Werey, Z. Larabi, A. Rozan. Addressing socio-economic and environmental impacts in sewer networks' rehabilitation decision making tools. DIME Workshop :Environmental innovation in Infrastructure sectors, Aug 2009, Karlsruhe, Germany. 13 p. ⟨hal-00614881⟩
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