The National Network for Monitoring the Temperature of Lakes and Ponds (RNT plans d'eau) aims to track the warming trajectories of French water bodies in the context of climate change. The lakes and ponds included in the network are representative of specific typologies, biodiversity issues, or particular uses.

In November 2025, two ponds in the Hauts-de-France region (North of France) were equipped following the network’s protocol: two sensors record temperature at fixed depths and at an hourly time step. The installation of this equipment on the two water bodies was carried out by the Regional Knowledge Service of the Hauts-de-France Regional Directorate of the OFB.

These two ponds (Vignoble and Romelaëre) are already monitored under the European Water Framework Directive (2000/06/EC) for several parameters: fish, macroinvertebrates, phytoplankton, and chemistry. The precise temperature data that will be generated will help refine the assessment of the status of these ponds by characterizing their thermal regime.

After the first data retrieval, and once the data have been validated and stored, the temperature time series will be accessible via the “thermie” dashboard of the Pôle R&D ECLA.

More information about the network: https://poleecla.fr/reseau/thermie