The impacts on water resources of climate change lead to increasingly severe and sustainable low water levels, particularly on the course of the Vézère. In view of these recent difficulties and climate prospects, several actors including the Adour Garonne Water Agency want a global study at the scale of the Vézère basin to be conducted in order to determine a low-water support model to best meet all uses. It is the Department of Corrèze that will assume the portage of this study.