title: Evaluation of the relative roles of a vegetative filter strip and a biofiltration swale in a treatment train for road runoff.
abstract: In order to determine the relative importance of a vegetative filter strip and a biofiltration swale in a treatment train for road runoff, US EPA Storm Water Management Model was used to model infiltration and runoff from the filter strip. The model consisted of a series of subcatchments representing the road, the filter strip and the side-slopes of the swale. Simulations were carried out for different rain scenarios representing a variety of climatic conditions. In addition, a sensitivity analysis was conducted for the model's different parameters (soil characteristics and initial humidity, roughness, geometry, etc.). This exercise showed that for the system studied, the majority of road runoff is treated by the filter strip rather than the biofiltration swale, an effect observed especially during periods of low-intensity rainfall. Additionally, it was observed that the combination of infiltration of road runoff in the filter strip and direct rainfall on the system leads to a significant and variable dilution of the runoff reaching the swale. This result has important implications for evaluating the treatment efficiency of the system.
authors.affiliation: Laboratoire Eau, Environnement et Systèmes Urbains, Université de Paris-Est - Ecole des Ponts Paris-Tech, 6-8 avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, 77455 Marne-la-Vallée Cedex 2, France E-mail: kelsey.flanagan@enpc.fr.
authors.forename: Kelsey
authors.initials: K
authors.lastname: Flanagan
authors.affiliation: Cerema/DTer Ile-de-France, 12 rue Teisserenc de Bort, 78190 Trappes, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Branchu
authors.affiliation: Cerema/DTer Ile-de-France, 12 rue Teisserenc de Bort, 78190 Trappes, France.
authors.forename: David
authors.initials: D
authors.lastname: Ramier
authors.affiliation: Laboratoire Eau, Environnement et Systèmes Urbains, Université de Paris-Est - Ecole des Ponts Paris-Tech, 6-8 avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, 77455 Marne-la-Vallée Cedex 2, France E-mail: kelsey.flanagan@enpc.fr.
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Gromaire
mesh_terms: D004785:Environmental Pollutants / Q000302:isolation & purification*; D005374:Filtration; D005602:France; D008962:Models, Theoretical; D006109:Poaceae / Q000254:growth & development*; D011891:Rain; D014872:Water Movements; D018508:Water Purification / Q000379:methods*
chemical_list: D004785:Environmental Pollutants