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Communication Dans Un Congrès Année : 2014

Identification and representation of water pathways from production areas to urban catchment outlets: a case study in France

Résumé

Hydrographic networks in urban areas combine several sources and water pathways, including buried channels and, more recently, source control practices. Moreover, pervious areas may be either directly or indirectly connected to drainage facilities and pipe water seepage. All these pathways have significant operational consequences since they challenge design principles, sizing guidelines and operating rules for both collection and treatment facilities, which might even undermine the efforts to improve the quality of receiving waters. The project proposed herein aims to generate a detailed description of the water pathways on an urban catchment in order to assess the impact of urban planning strategies and provide guidelines for sewer system evaluation and rehabilitation. The work presented in this paper has taken place within the Pin Sec catchment (Nantes, France); it consists of collecting and analyzing groundwater, wastewater and rainwater in the catchment and then applying the isotopic and chemical results to trace the mixing that occurs in the pipes. Results reveal that isotopic tracing is indeed relevant on this catchment. The isotopic signatures of drinking water and groundwater vary sufficiently during spring, up to 1.50 for ´18O and up to 120 for ´2H in May. The ratios of defective connections and water seepage may be deduced from this output. Chemicals also support the findings of the isotopic tracing results.
Identification des chemins de l'eau depuis les sources de production jusqu'aux exutoires en milieu urbain
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Dates et versions

hal-01467408 , version 1 (14-02-2017)
hal-01467408 , version 2 (20-06-2017)

Identifiants

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Florent Seveno, Fabrice Rodriguez, Kevin de Bondt, Claude Joannis. Identification and representation of water pathways from production areas to urban catchment outlets: a case study in France. 2nd International Conference on the Design, Construction, Maintenance, Monitoring and Control of Urban Water Systems (Urban Water II) , May 2014, Faro, Portugal. pp.245-256, ⟨10.2495/UW140211⟩. ⟨hal-01467408v2⟩
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