In the domain of water quality modelling in urban drainage, FLUPOL and
MOSQITO are among the first software packages to simulate pollutograp
hs during a particular rainfall event. They both have similar approach
es to the phenomenon. Nevertheless the observed divergences between th
em induced a comparison of the two programs by Anjou Recherche and Wal
lingford Software. Even if the experiments made with the original cali
bration and validation data, followed by the one on the pilot study of
the Stangalard, pointed out the difficulty of having a fully balanced
benchmark, it seems that the FLUPOL concepts were more appropriate fo
r operational engineering.