This technical report presents the characteristics of the LTER site, the Aurade catchment which belongs to the French Research Infrastructure OZCAR. This report describes the main scientific and technical objectives of this experimental site, the different equipments and devices to measure the different compartments of the critical zone: the atmosphere, the soils and the waters. It presents some scientific results obtained and it gives the lists of the available data and of the publications, thesis and communications. Some other informations in relation with this experimental catchment are given concerning the collaboration with the farmers (GAGT), the main projects (like ANR PESTIPOND) and the scientific meetings organized in this catchment.