Comparaison de différentes solutions de gestion des eaux pluviales dans un projet d’aménagement

Abstract : Three scenarios for stormwater management in a very impervious 6.5 ha industrial area were investigated: i) a separate stormwater pipe system with a downstream infiltration tank, ii) a cascade of infiltration swales along roads and iii) vegetated roofs and infiltration swales. Firstly, the facilities were sized according to a double triangle design storm with a 10 year return period. Secondly, continuous simulations of the behavior of the facilities were carried out, with a 6 minute time step for time series (rainfall and evapotranspiration) over 21 years (1992-2012). Differences are very significant between the three scenarios. In the first scenario, the separate stormwater network includes 535 m of pipes and a 1600 m 3 downstream infiltration tank. In the third scenario, the roofs are entirely vegetated, with a maximum storage capacity of 32 mm/m 2 , allowing to divide by two the total length of swales compared to the second scenario with impervious roofs. Vegetated roofs allow a decrease of 42 % of the runoff volume. Compared to conventional sizing with a design storm, continuous simulations allow to study in detail the hydrological behavior of the facilities at all time scales (from the time step to the event scale, from the event to the year and the multi-year scales), to run statistical analysis of the results, to understand the behavior of the system for particular events or periods within the time series and possibly revise the design.
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Jean-Luc Bertrand-Krajewski, Pauline Herrero. Comparaison de différentes solutions de gestion des eaux pluviales dans un projet d’aménagement. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2016, pp.28 - 42. ⟨10.1051/tsm/201604028⟩. ⟨hal-01758988⟩



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