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Updated: Aug 18, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
Quantitative and qualitative hydrologic balance for a suburban watershed with a separate sewer system (Nantes,
V Ruban1, F Larrarte, M Berthier
1Laboratoire Central des Ponts et Chaussées, 44341 Bouguenais cedex, France. Veronique.ruban@lcpc.fr
Abstract:
A qualitative and quantitative budget at the outlet of the storm-water runoff system of a small suburban watershed is presented together with some data regarding waste-water. 445,000 m3 (34% of the rain-water volume) were drained by the storm-water runoff system and 40,879 m3 by the waste-water system from September 2002 to March 2004. Storm-water runoff is generally not heavily polluted with regard to trace metals but concentrations occasionally exceed the standards for surface water of good quality. On the contrary, pesticides (diuron and glyphosate) have very high concentrations especially in spring and autumn when their use is maximum. As the St Joseph storm-water runoff is finally discharged into the Erdre River, measures to reduce the use of these pollutants should be considered.
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