Impact potentiel de l’utilisation de l’eau de pluie dans le bâtiment sur les consommations d’eau potable à l’échelle urbaine : le cas de l’agglomération parisienne

Abstract : This research aims at assessing the effects generated, on management of urban water in the long term, by progressive development of rainwater harvesting (RWH), and more particularly on the drinking water supply. It is carried out in a prospective way on the scale of Paris and its suburbs. On the whole, this research contributes to a controversy about the validity of a centralized model of management of water in an urban environment. After a description of the RWH in urban areas, this report presents state of the art tools and scientific methods, and focuses on the development of a scaling approach. The objective is to produce, a significant assessment of potential potable water savings (PPWS), on an urban scale by substituting part of it by rainwater recovered for uses which do not require such quality. With this aim, we propose an approach based on sequential evaluation using an intermediate scale (the municipality), on merging of buildings with similar characteristics related to RWH and four methodological principles (modeling, aggregation, increase, Ranking strategy)Applied to the Paris agglomeration, the implemented methodology shows that the recovered rainwater volume is likely to represent a potential equivalent of 65% of the demands for non-drinking water and of 11% of the drinking water distributed. This research also highlights that the residential sector constitutes the major contribution of this potential, because it holds 2/3 of the total potential to the Paris agglomeration. The first analysis of the system of actors implied in the RWH in urban environment has also been developed. This analysis makes it possible to identify a specific subset of actors who have the capacity to carry out an “lever” action in generalizing this practice on an urban scale, either directly because of their capacity of leading a collective action (for a set of buildings for example), or indirectly through their capacity to act on the owners of the buildings (by incentive mechanisms in particular).Finally, this work positions RWH in on urban environment within the general debate related to the evolution of present cities
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Ali Belmeziti. Impact potentiel de l’utilisation de l’eau de pluie dans le bâtiment sur les consommations d’eau potable à l’échelle urbaine : le cas de l’agglomération parisienne. Architecture, aménagement de l'espace. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1051⟩. ⟨pastel-00718463⟩

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