A New Method for Assessing the Contribution of Atmospheric Deposition to the Stormwater Runoff Metal Load in a Small Urban Catchment

Percot, Stéphane; Ruban, Véronique; Roupsard, Pierre; Maro, Denis; Millet, Maurice

A New Method for Assessing the Contribution of Atmospheric Deposition to the Stormwater Runoff Metal Load in a Small Urban Catchment

2016

Percot, Stéphane | Ruban, Véronique | Roupsard, Pierre | Maro, Denis | Millet, Maurice

The contribution of atmospheric deposition to the metal load at the outlet of a small urban catchment (Pin Sec, France) was studied. A new method, which takes into account the type of urban surfaces (glass, tile, bitumen, zinc sheet, grass, facade coating, and slate) as well as turbulence and local micrometeorology, was developed to measure atmospheric dry deposition. Dry deposition, wet deposition, and stormwater runoff load were all measured from September 2010 to August 2011. At the annual scale, atmospheric deposition was not a major contributor to the metal load at the outlet of this small catchment. Wet deposition however ranged from <1 to 29 %. The contribution of dry deposition (generally less than 5 %) was especially low and appeared to be smaller than that reported in previous studies. On this catchment, the majority of the metal load could be attributed to stormwater runoff (64–99 %). This methodology looks promising and should be taken into consideration when conducting new research on the contribution of atmospheric deposition to the pollutant load in urban catchments.

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