Martin Laverty
Member
"OFD is Britain's third longest cave and at 308 m deep is its deepest." - so says the SWCC website, and numerous derivatives.
Yet, in looking at some figures in the course of reviewing the content of the Cambrian Cave Registry, I find that the resurgence is at an altitude of around 184m and sink at Pwll Byfre is at just less than 480m. I don't know of any passage in OFD being claimed to be above the level of Pwll Byffre (although it could be as the surface goes up to 538m in the vicinity), so the maximum possible depth (excluding any very deep sumps) would appear to be 296m. Looking at survey elevations, the actual vertical range appears to be more like 275m - still the deepest in the UK.
As newly enrolled Registrar, I would appreciate any comments on the Cambrian Cave Registry [ http://www.cambriancavingcouncil.org.uk/cave_registry.html ] - its content, presentation, and future direction...
Yet, in looking at some figures in the course of reviewing the content of the Cambrian Cave Registry, I find that the resurgence is at an altitude of around 184m and sink at Pwll Byfre is at just less than 480m. I don't know of any passage in OFD being claimed to be above the level of Pwll Byffre (although it could be as the surface goes up to 538m in the vicinity), so the maximum possible depth (excluding any very deep sumps) would appear to be 296m. Looking at survey elevations, the actual vertical range appears to be more like 275m - still the deepest in the UK.
As newly enrolled Registrar, I would appreciate any comments on the Cambrian Cave Registry [ http://www.cambriancavingcouncil.org.uk/cave_registry.html ] - its content, presentation, and future direction...