VD - Villes Durables 

Outil MÉthodologique d'aide à la Gestion intégrée d'un système d'Assainissement – OMEGA

Decision Support System For Sustainable Urban Water Management Strategies

The objective of the OMEGA project, during 2010-2013, is to develop and test a pluri-disciplinary assessment methodology allowing (i) to measure service provided by the urban water management system; and (ii) stakeholders to choose a strategy in order to improve service provision.

A complex legacy to manage

Nowadays urban drainage systems have become much more than a simple removal of storm-water and sewage out of the city. New management objectives and techniques must be considered, for instance related to the protection of aquatic environments or mitigation of nuisances due to the wastewater system. Moreover, urban water is becoming an increasingly important resource and a growing diversity of organizations and actors promote the emergence of new techniques. It is thus well known that the urban water system becomes more and more complicated and many experts argue that the concept of urban drainage should evolve into a more integrated concept of urban water management.<br />The waters produced within the city must be integrated into the design, organization and management of the city. It is then necessary to define means of interactions and cooperation between all pertinent organizations and actors, at the scale of the urban precinct and at the scale of the catchment area. These changes must concern both the technical facilities (object, device) and the stakeholders (local authorities, firms, non-profit organizations, etc.) which contribute to urban water management and provide services. This goal can only be achieved if service provision can be objectively assessed. This assessment allows stakeholders to choose the most efficient strategies.<br />

More precisely, this methodology provides an efficient means to:
- precisely define traditional and emerging functions that a sustainable urban water system should fulfill;
- define assessment means (indicators) that should be understood by all stakeholders;
- define the level of service that is expected by stakeholders and organizations regarding each function (target level for each indicator);
- define responsibilities for each service (by whom, when, how, to which level of service…);
- choose the most efficient strategy to meet the performance target;
- assess the service level that is actually provided by the system, throughout the implementation of the chosen strategy, and identify performance deficiencies;
- produce feedbacks on the strategy, by taking account of the demand evolution and/or gaps observed between predicted and observed results of the strategy.

As the world faces an economic crisis, a number of major environmental challenges will have to be dealt with without significant increases in financial outlays. Only alternative ways of viewing and approaching these problems can possibly lead to finding sustainable solutions. In this context, the OMEGA project aims to provide the operational tools for management services, tools that are indispensable to reach urban water management objectives.
The management of stormwater and urban water can no longer be considered as a simple urban technique that “sanitation” engineers assume responsibility for after-the-fact. Wastewater produced by the city must be integrated into the core reflections on the design, organization, and management of the city. Today, water management relies solely on the separate consideration of each system (wastewater, stormwater, drinking water, recreational water, natural water, etc.), but a comprehensive approach to urban water management will soon be indispensable. This does not necessarily mean spatially widening the scope; it rather means taking into account all the urban and natural water-related elements. This requires finding modes of interaction and, most importantly, of cooperation between all the concerned organizations and players within the urban territory and the wider catchment area. The paradigm shift must therefore take into account technical facilities (objects and structures) and organizations (municipalities, water companies, syndicates, groups, associations, etc.) that play role in urban water management. Of course, the stakes are high for the local authorities, the companies in the sector and for all cities. They imply core business changes and the extension of competencies, the adaptation of urban water management organizations, cohabitation between older collective networks and small segmented networks, and the coordination of many organizations while ensuring treatment equity to the users.

3 delivrables available (in French) :
- First delivrable of the programm : 2a «Approche systémique du système de gestion des eaux urbaines «
- Second delivrable of the programm : 1a «Élaboration du cadre méthodologique«
- Third delivrable of the programm : L9 «Bilan des applications sur les cas d'étude«

Numerous full scale studies on the territories of our parteners...

see www.graie.org/OMEGA2/OMEGAgb/spip.php for more information and see also www.graie.org/OMEGA2/spip.php if you can read French...

Final conference of the research program: 22 may 2014 in Lyon !

Peer-reviewed article : Caradot, N., Granger, D., Chapgier, J., Cherqui, F. & Chocat, B. (2011) Urban flood risk assessment using sewer flooding databases. Water Science & Technology 64, 832-840.

Book contribution :
-Améliorer la performance des services publics d’eau et d’assainissement sous la coordination de Pierre-Alain Roche, président de l’ASTEE, Solène Le Fur, chargée de mission de l’ASTEE, et Guillem Canneva, enseignant-chercheur à AgroParisTech : Fichier PDF egalement disponible sur le site de l’ASTEE
-Cherqui F., Werey C., (2013) «Pour un service intégré de la gestion des eaux urbaines« dans Urbanisme et services publics urbains : l’indispensable alliance, Ouvrage introductif au 92ème congrès de l’ASTEE, 4-7 juin 2013 à Nantes pp. 64-67. lien vers l’article

Numerous conference articles : cf. www.graie.org/OMEGA2/OMEGAgb/spip.php

Nowadays urban drainage system becomes much more than a simple removal of storm-water and sewage out of the city. New management objectives and techniques are considered, for instance related to protection of aquatic environment or mitigation of nuisances due to the wastewater system. Moreover urban water is becoming an increasingly important resource and growing diversity of organisations and actors promote the emergence of new techniques. The urban water system becomes more and more complicated and many experts consider the necessity of replacing the concept of urban drainage by the concept of urban water management. The waters produced within the city must be integrated to design, organisation and management of the city. It is then necessary to define means of interactions and cooperation between every organisations and actors, at the scale of the urban area and at the scale of the catchment area. These changes must concern both the technical facilities (object, device) and the organisations (local authorities, firms, non-profit organisations, etc.) which contribute to urban water management and provide services. This goal can be achieved if service provision can be objectively assessed. This assessment allows stakeholders to choose the most efficient strategies. The objective of our project is to develop and test a pluri-disciplinary assessment methodology allowing (i) to measure service provided by the urban water management system; and (ii) stakeholders to choose a strategy in order to improve service provision. This assessment takes into consideration technical, environmental, social, economical and organizational aspects. It will allow to assess the efficiency of a strategy a priori and after implementation, in order to provide a comprehensive decision support (support to public discussion regarding the definition of assessment criteria, production of scientific data, rationalization of decisions within deliberation processes). More precisely, this methodology will enable to: - define precisely traditional and emerging functions that a sustainable urban water system should fulfil; - define assessment means (indicators) that should be understood by all stakeholders; - define the level of service that is expected by stakeholders and organizations regarding each function (target level for each indicator); - define who and what: stakeholders and organizations, and systems and devices that are involved in producing the service and providing the expected service level; - choose a strategy that is expected to be the most efficient way to fulfil the target level; - assess the service level that is actually provided by the system, all along the implementation of the chosen strategy, and gaps to the target levels; - produce feedbacks on the strategy, by taking account of the demand evolution and/or gaps observed between expected effects and actual effects of the strategy.

Project coordination

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

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Beginning and duration of the scientific project: - 0 Months

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