The collaboration between the Adour-Garonne French Water Agency (AEAG) and the PeGIRE laboratory of the Aquapôle (former CEME) for the application of Pegase to its watershed has started in 2003 by the development of a pilot application of the model to the whole watershed.

This application has been regularly updated, modelled network and pressure data. Currently, the application, last updated by the Agency themselves, models 60 534 km of rivers (network of 8 313 rivers) for 116 800 km² watershed (catchments of Adour, Garonne, Dordogne, Charente and smaller coastal catchments).

AEAG use the Pegase model themselves since 2005 via a remote connection to a Unix server in the Aquapôle premices. They use the PegOpera version on their own PC since 2013.