page_title: Bournillon cave
section_title: Hydrology
hierarchical_section_title: Bournillon cave / Hydrology
caption_attribution_description: Français&#160;: La rivière de la grotte de Bournillon peut avoir des débits spectaculaires.
context_page_description: The Bournillon cave is located in the commune of Châtelus in the Isère Department of France, in the Vercors Massif. It has the highest cave opening in Europe. It is one of the main karst springs of Vercors, with a maximum flow rate of 80 cubic meters per second.
context_section_description: Lower in the Bournillon Gorge is the Sources de Arbois, which is the normal resurgence for the catchment area, which constitutes much of southern Vercors: the high plateau of Vercors and the Vassieux High Plateaux. When the Sources de Arbois flow in excess of 3.5 cubic meters/second, the overflow goes into the Bournillon system. When the flow rate in the cave exceeds 40 cubic meters/sec, then another overflow starts at the Luire cave. The stream from the Bournillon flows into the Bourne, which is a tributary of the Isère river, and from thence to the Rhône.
caption: The stream flowing from the Bournillon cave in full flow.
exif: {"Image Tag 0x000B": "Windows Photo Editor 10.0.10011.16384", "Image Orientation": "Horizontal (normal)", "Image Software": "Windows Photo Editor 10.0.10011.16384", "Image DateTime": "2017:06:13 15:15:10", "Image ExifOffset": "2242", "Image Padding": "[]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "96", "Thumbnail YResolution": "96", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "4516", "Thumbnail JPEGInterchangeFormatLength": "8271", "EXIF DateTimeOriginal": "2017:06:13 14:45:57", "EXIF DateTimeDigitized": "2017:06:13 14:45:57", "EXIF SubSecTimeOriginal": "98", "EXIF SubSecTimeDigitized": "98", "EXIF ColorSpace": "sRGB", "EXIF Padding": "[]"}