As party of the study for expansion area of Zango, included in Population Resettlement Plan, the earthworks for the platform of residential areas and access roads, the drainage network of main roads, in order to drain the rainwater out of the intervention area, the drainage network of the main roads in habitation areas and the a sanitation network integrated for all city were defined. It was also foreseen the construction of a wastewater treatment plant to designed for a population of 400 000 people.