“…In order to build up these budgets we have combined three types of data sources resulting from the PIREN-Seine studies, various types of censuses, and regular environmental surveys: (i) metal flux measurements were realized at atmospheric fallout stations (Azimi et al, 2003(Azimi et al, , 2005Azimi, 2004;Garnaud et al, 1999), at various river stations on dissolved metals (Elbaz-Poulichet et al, 2006), and particulate metals (Cossa et al, 1994;Horowitz et al, 1999;Meybeck et al, 2004;Grosbois et al, 2006), on Paris sewage waters (Tusseau-Vuillemin et al, 2007-this volume) and sludge (Meybeck et al, 2007-this volume), river dredged material (Carpentier et al, 2002a,b); (ii) experimental field studies on several plots located at the Versailles agronomic station , and on the Marais urban catchment (0.42 km 2 ) located in the historical centre of Paris city Chebbo and Gromaire, 2004): in this catchment multiple studies concerning roof runoff, street runoff and domestic sewage composition were realised (Gromaire et al, 2000(Gromaire et al, , 2002Kafi-Benyahia et al, 2005;Moilleron et al, 2005); (iii) material flows and census statistics: many of them are only available at the national level and have been downscaled for the Seine River catchment and/or Paris conurbation as the metal inputs (DGDDI, 2000), the metal uses (FEDEM, 2003), the fertiliser use (Unifa, 2005), the metal contents in domestic solid wastes (ADEME/INSAVALOR POLDEN, 1998); the census of industrial waste water inputs to the Seine catchment is presently under revision using direct outlet monitoring realized at the county (département) scale (AESN, 2006).…”