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Guillon A.,Conseil General des Hauts de Seine | Lemenager B.,Conseil General des Hauts de Seine | Kovacs Y.,SEPIA Conseils | Gros F.,SEPIA Conseils
Houille Blanche | Year: 2011

In the event of major flooding by the Seine in the Hauts-de-Seine county, the Specialised Flood Rescue Plan (PSSI-Plan de Secours Spécialisé sur les Inondations) provides for coordinated emergency assistance and encourages local stakeholders to be independent. The Council of the Hauts-de-Seine county (Conseil général) has therefore listed the sites belonging to the county located in the area liable to flooding, and has set up plans to reduce the vulnerability to flooding by the Seine of the 41 most sensible sites. The aim is to encourage the independence of those in charge of the sites in staunching the impact of a flood and enabling a satisfactory re-opening of services. Because of the absence of experience records in this field, the County Council initially devised an assessment method based on work on 12 pilot sites. This was subsequently improved while supporting the sites in drawing up their plans. A preparatory level led to the definition of the reference probability of occurrence and of the crisis context data (warning chain, vulnerability of networks, of transports). Each site received an assessment visit involving an analysis of the origins of flooding and the listing of vulnerable elements reached by a centennial flood. Organizational measures were then identified through a process which, based on collaboration with the director of each premises, went beyond the limits of a technical audit. Structural measures for the protection of vulnerable elements were also listed. This method favours the rooting of a risk management culture through dialogue, through the transmission of clear information and the production of simple action headings. This awareness-raising effort was conducted by initiating and leading work sessions and writing up the resulting documents. Experience on the ground revealed differences in culture and in operation between the various sites, calling for response strategies adapted to specific needs. The project also sought to provide solutions to the problems of resuming normal business at the sites and of ensuring the continuity of public services. These solutions are cross-disciplinary and require coordination between the various stakeholders. © 2011 Société Hydrotechnique de France.

Lehoucq C.,Conseil General des Hauts de Seine | Michaud A.-C.,Sevesc Assainissement des Hauts de Seine | Kovacs Y.,Sepia Conseils | Forestier S.,Sepia Conseils | And 3 more authors.
Techniques - Sciences - Methodes | Year: 2013

In 2005, the département council of Hauts-de-Seine approved its sewer system master-plan for the next 15 years. In a highly urbanised context, the département conducts a voluntary policy for stormwater control aimed at reducing combined sewer overflow and the flooding risks. To improve the efficiency of its policy in the Hauts-de-Seine county, urban managers and sewer system owners' commitment is needed. Therefore, the département has developed several tools to promote a consistent policy for sustainable stormwater management. After seven years, the département has wished to initiate a review of its policy through a series of interviews of its partners: local authorities and developers. These interviews have shown that stormwater regulation rules are now included in most municipalities' sewer system regulation documents and land use plans. Although many new buildings and developments were exemplary, it seems that some reticence sometime remains about stormwater source control and also access in private estates for checking the stormwater collecting system. Continuing a strong and long-lasting policy as well as improving stormwater source control will contribute to update our sewer system master-plan.

Carre C.,Paris-Sorbonne University | Barraud S.,LGCIE | Debordes M.,ISIM Montpellier | Deutsch J.-C.,ParisTech National School of Bridges and Roads | And 4 more authors.
Techniques - Sciences - Methodes | Year: 2010

This paper takes into account the critics of endof-pipe systems for urban water control, under a technological approach, as well as sustainable development expectations. It starts with a presentation of the current means of control -whether public or private- in French cities, and the parts that both solutions play in urban pollution and flood management. Whatever the political and financial difficulties that are actually being faced by the private solutions for rain water drainage for private reuse and more specifically that of the storage/infiltration of runoffs, the aim of this article is to assess the restructuring -whether they are in progress or expected in the future- of the public services in their missions and mode of operation, in relation to all the players, users and inhabitants. urban stormwater management, source control, rainwater harvesting, citizen participation.

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