With a view to preventing and reducing discharges to water, Groupe ADP has set itself the target of establishing a zoning system (*) by 2020 that presents clearly defined rainwater management rules by area and incorporates climate change adaptation. Today, as part of Groupe ADP’s commitment to improving its management of rainwater at the airport, CDGL, the Energy and Logistics Division at Paris-Charles de Gaulle Airport, is working to further develop the airport’s rainwater treatment system.  Image / The Renardières holding pond, a rainwater management system designed to reconcile the airport’s activities with environmental conservation.

At Paris-Orly and Paris-Charles de Gaulle Airports, in addition to holding ponds and a pollutant isolation system, Groupe ADP already has rainwater treatment facilities that enable it to meet the regulatory requirements for discharges into the natural environment (local government order).

“For better-controlled rainwater evacuation, Paris-Charles de Gaulle Airport has recently completed work to separate clean water from contaminated water, as well as a process to transfer water highly-contaminated with winter pollutants to wastewater.” 2017 Registration Document / Social, environmental and societal information – Groupe ADP (extract)

Frédéric Navarre, Head of the Services and Environment Division at CDGL, invites you to watch an educational video on this topic and explains the improvements carried out to Paris-Charles de Gaulle Airport’s rainwater management system.

Significant improvements have been made to how we treat rainwater at Paris-Charles de Gaulle, including the introduction of new drains and other systems to segregate different types of wastewater. The most polluted water will now be separated and stored independently from cleaner water. Depending on the quality of the wastewater, it will be directed to different areas (wastewater networks for highly polluted flows, rainwater treatment facility or discharge into rivers for the least polluted flows). A decision-making tool (OAD) will help users select the correct segregation according to conditions (e.g. in winter). Frédéric Navarre

Currently, all polluted water from Paris-Charles de Gaulle Airport passes through pumping stations and holding ponds before being treated and released into the natural environment.

The Paris-Charles de Gaulle rainwater treatment system (Europe’s largest airport in terms of surface area) is made up of:

  • 120km of collectors
  • A zoning system (*) designed to facilitate infiltration – restricting the maximum leakage of buffering ponds to 1 litre/second/hectare (rainwater storage capacity equal to 550 m3 per hectare)
  • A comprehensive Groupe ADP laboratory that uses a network of measurement points (piezometers) to monitor the level of the water table and the quality of rainwater released into the natural environment.