We have been involved in the experimental equipment of the water catchment of Strengbach, Alsace (France). The collaboration is with the Institut Terre & Environnement de Strasbourg – École & observatoire des sciences de la Terre. The main aim of the field campaign is the acquisition of data (e.g., temperature, radiation, air humidity) to shed new light on the dynamics of evapotranspiration, which plays a crucial role in the overall water cycle at the catchment scale.