Water in La Confluence, a defining marker
Water is symbolic of the quarter, which is flanked by two rivers, hence its name, “La Confluence.” Its water gardens on the banks of the Saône and the marina add to the effect. A factor of well-being for residents, the presence of water also helps promote biodiversity in the heart of the city.
La Confluence: why is it important to have water and nature in the city?
RAINWATER, WASTEWATER AND GREY WATER: A SEPARATE TREATMENT FOR EACH ONE
A 40-hectare drainage system has been deployed with separate treatment for rainwater and wastewater. Rainwater is simply filtered before being discharged into the river. It is cleansed of waste, light hydrocarbons and suspended solids. Only wastewater is sent to the Pierre Bénite treatment plant, meaning that it receives less water to be treated.
In order to save drinking water, the collection of rainwater and grey water is also encouraged for use in the garden, for flushing toilets or for domestic hot water (DHW).
FACILITATING RAINWATER INFILTRATION
Reducing soil sealing helps the natural infiltration of water in the quarter. With this objective:
- water gardens are created with water pumps that only remove excess water,
- swales are built to allow surface water runoff.
- public spaces are planted with vegetation.
Permeable materials such as porous paving stones and certain types of jointed slabs are used in parking spaces where possible. These materials help prevent the overflow of the drainage system and avoid further pollution of groundwater and rivers.