- Schwyll Aquifer
Schwyll Aquifer (pronounced 'Shwill') was historically known as 'the Great Spring of
Glamorgan '.Until recently,
Welsh Water used theresurgence at the Schwyll Spring nearEwenny as the main source of water for theBridgend area. It now functions as a backup supply and as such has a number of associatedsource protection zone s policed by theEnvironment Agency . The outflow of the spring is far larger than any otherfreshwater spring inWales and greater than that fromWookey Hole orCheddar Gorge risings.The aquifer consists of an
underground waterway in theCarboniferous Limestone ofSouth Wales . Due to the delay between local heavyrain and discoloration of the water at the spring, it is believed that the water originates from as far as 20 miles away. This would locate the main source in the limestone of the southern edge of theBrecon Beacons . The lack of an accessiblecavern at the rising hinders exploration of thecave system. The only known point of access so far is at the pumping shaft of the extraction plant at Schwyll. The system was explored by cave divers in 1998 to a distance of 440 metres from the shaft. At 400 metres, a large cavern was discovered containing some bones which were identified as a species of horse. The bones were submitted for dating.External links
* [http://www.divernet.com/technol/well298.htm Well diving in Wales - Feb 1998]
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