The swampy alder grove and flooding of the Barbe stream

The swampy alder grove relies on proximity to a watercourse or groundwater to survive. Here, it is subject to the periodic flooding of the meandering Barbe stream. The stream is fed by two sources: a main one between the hamlets of Barbe and Croix d’Astel, and a secondary one near Granges Hautes, before joining the Carretou stream on the other side of the D46, at the boundary of the Sensitive Natural Area.