Set in the Afan Valley, South Wales, Glyncorrwg Colliery is a disused mine that closed in the 1970s but continues to discharge bright orange ochre deposition downstream. The mine water treatment measures at Glyncorrwg include approximately 500 linear metres of channels directing contaminated water through a series of reed beds, cascades, settlement ponds and weirs which run parallel to the river Corrwg. The channels had previously been lined with an LLDPE liner protected by a nonwoven geotextile. This geotextile had degraded over many years to the extent that the liner had deteriorated through UV degradation, puncture and wear, which would ultimately lead to contamination of the Corrwg. Site access was limited due to the proximity of the river Corrwg and the presence of a weak bridge. Concrete Canvas® (CC) was specified as a long term protective replacement to the deteriorated geotextile and liner solution, having proved successful on previous contracts.
