National Code of Sub-Soil (BSS) assigned by the Office of Geological and Mining Research (BRGM) to underground structures including water abstractions. Established according to the principle of positioning a point on a 1:50,000 geological map, the BSS code* is of the following form: 08035X0398 / F. The characteristics that are associated with it (geographic coordinates, depth and geological profile) are then used to precisely locate each intake and identify the abstracted groundwater.