A new real-time drinking water network mixing model for the control and command centre of the city of Paris.

The Paris drinking water system has the particularity of being supplied by many different sources: surface water from the Seine and Marne rivers and underground water from sixty-three springs. This diversity of origins of the water and the existence of a gridded network leads the company in charge of the production and the quality of the water in Paris, Sagep, to partly mix the water in the network. Knowing the impact of the mixing on the physical parameters, and consequently on the quality of this mixed water, Sagep had searched for a tool to control the water origins in the network in order to limit extreme changes. A study led Sagep to develop a new kind of real-time water mixing model.