In terms of infrastructure development, the Department of Wastewater and Storm Water Treatment for the Paris Metropolitan Area (Syndicat Interdepartemental pour I 'Assainissement de I ’Agglomeration Parisienne, SIAAP) has put in place a strategy based on demographic changes and the expansion of damp-proofing urban surfaces. This includes investment in new infrastructure (10 watersheds and 4 tunnels) to store 1.02 million m! Meanwhile, integrated strategic planning has also been set up.