Rhondda Cynon Taff
, Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
Rising
Access
On entering Penderyn from the Hirwaun direction just part the 30 mph sign on the right is a gate to a road leading down to the pumping station. It is private ground owned by the Hirwaun Industrial Estate, and permission should be sought from the resident Engineer of the estate to visit the site.
Description
It is a shallow pool now because of silting-up, which wells up in all weathers. It is just West of the Cadlan Stream which sinks in the bed at this point, and the River Cynon then starts! It is about 15m x 10m. Just NW of it is the pumping station which supplies all the locality and estate with over millions of water a day from a borehole 55m deep from a natural underground reservoir, due to a geological fault.
History
Hydrology
Proved accidentally that it is the rising for Ogof Fawr (by UBSS). 0.1 cumecs (80,000 gallons per hour) are taken for water supply and pumping reduces water level by 'only a foot, even in drought'
Lecture given to the Penderyn Historical Society by Mr Barlin, a mining engineer, around 1975.
WSG Bulletin Supplement 6, March 1973. Frank Bagueley, Water tracing [...contamination by fluorescein introduced by persons unknown into Ogof Fawr...two water boards affected likely to cost thousands of pounds...]
