Les rejets de temps de pluie par les surverses de postes de relèvement en réseau séparatif d'eaux usées et leurs relations avec les différents types d'eaux claires parasites

This communication is dealing with separate sanitary sewer overflows from pumping stations. It relies on the processing of data recorded during 4 years on 33 pumping stations in the urban community of Nantes (France). These data enable to make the difference between overflows caused by infiltration/inflow, and overflows caused by pump failures, as well as pointing out differences in the behaviour of different pumping stations in different hydrological years. Infiltration seems to have an effect on overflows, at least as an increasing factor during winter period.