Environmental component as part of the water law file for the renaturation of the Bièvre River in downtown Jouy-en-Josas, progressive phasing of river reopening to promote biodiversity development, improve water quality in the Bièvre, expand wetland areas to prevent flooding…, initial section in the city center of Jouy-en-Josas between the train station and the shopping center, greening of the banks, development of the adjacent parking lot, endemic plant palette, integration of a new pedestrian footbridge to enhance site attractiveness and accessibility.