The risings are midway between Ewenny and Ogmore (B4524), opposite the ruins of Ogmore Castle. The risings are used to supply water and are not open for inspection.
Description
The water emerges from the system at the bottom of a deep well. The water is very 'hard'.
Dived extensively by Martyn Farr et al
History
Hydrology
Yield recorded in 1957 as at least 4.25 Mgpd [.224 cumec]. Summarised by Hobbs in UBSS (1993)
John Evans, 1803, Letters written during a Tour through South Wales, p.130 "Near the point where the Ewenny river falls into the Ogmore...from the foot of this down issues a large body of water, exceeding in quantity that into which it flows. It foams and boils under the hill, as though it met with great interruptions, and forms two streams alternate in the velocity of their motions; one being hard, the other soft; and that the southern stream was sought after for culinary purposes, and the northern stream frequented by the laundresses of the neighbourhood"
George Nicholson, 1808 (et seq.), The Cambrian Traveller's Guide, p.175 "Near the point where the Ewenny falls into the Ogmore...From the foot of this down issues a large body of water exceeding in quantity that into which it flows. It foams and boils under the hill, as tho' it met with great interruptions, and forms two streams which act alternately in the velocity of their motions; the one hard, the other soft."
A General View of the Agriculture & Domestic Economy of S.Wales (London, 1814), Davies, W., v1.p.110
Charles Frederick Cliffe, The Book of South Wales, the Bristol Channel, Monmouthshire and the Wye, 1848 p.149 "a very large spring of water, 15 feet wide and 3 deep, forming two streams - one hard, the other soft - boils up under the hill. The people call it Sheweel."
British Caver 11 (1943).Platten, G., pp.71-81, Mention.
records