Quantitative and qualitative hydrologic balance for a suburban watershed with a separate sewer system (Nantes, France).

摘要: A qualitative and quantitative budget at the outlet of storm-water runoff system a small suburban watershed is presented together with some data regarding waste-water. 445,000 m3 (34% rain-water volume) were drained by 40,879 waste-water from September 2002 to March 2004. Storm-water generally not heavily polluted regard trace metals but concentrations occasionally exceed standards for surface water good quality. On contrary, pesticides (diuron glyphosate) have very high especially in spring autumn when their use maximum. As St Joseph finally discharged into Erdre River, measures reduce these pollutants should be considered.