These data correspond to a non-systematic monitoring of organic matter and total carbon contents in water (rain, surface overflow, underground water) in the Roujan catchment area.

Contour map of the sub-catchment areas (Roujan)

Carte du réseau de fossés du Bassin versant de Roujan actualisé par un relevé de terrain en 2003.

Geological map of the Roujan catchment area ( 1/5000 scale), modified from the official BRGM geological map (1/50000 printed map number 1015)