Channel Lining | Glyncorrwg, Wales, UK

CC8^® used to line drainage channels in Glyncorrwg

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Project Overview

In January 2016, 1,640m² of Concrete Canvas^® GCCM (CC) was used to line and provide scour protection to a series of mine water drainage channels at Glyncorrwg Colliery, South Wales.

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, which had degraded over many years due to UV exposure, puncture and wear, which would ultimately lead to contamination of the Corrwg. Vegetation had also established in the invert of the channels, forming blockages and risking overspill.

Section of deteriorated geotextile and LLDPE Liner

Temporary damming of channel sections prior to CC installation

1640m²

of CC8^® was used to provide erosion control

200m²

installed per day in severe weather conditions

120 Year

design life

Solution

Site access was limited due to the proximity of the river Corrwg and the presence of a weak bridge. CC was specified as a long term protective replacement to the deteriorated geotextile and liner solution, having proved successful on previous contracts.

Deployment of CC8^®, fixing layers within anchor trenches, jointing using an autofed screwdriver, backfilling anchor trenches

Design & Installation

Channel was dammed off prior to work commencing
CC8^® Bulk Rolls specified
CC8^® Bulk Rolls cut into hand-portable Batch Rolls for sections that were unreachable by excavator
Transverse layup
Steel ground pegs inserted through each overlap within anchor trenches
Screwed overlap joints
Hydrated using bowser and hose with spray nozzle attachment

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Completed north section of CC lined channel

Summary

1,640m² of CC8^® was installed just over 4 weeks to provide durable, long term scour protection to the network of drainage channels. Install rates of over 200m² per day were achieved in often severe weather and poor ground conditions. CC has a delayed setting window of 2 hours, giving contractors time to install the material in extremely wet conditions without the fear of premature setting.

Following the success of the installation, similar schemes within the region are being considered by the Coal Authority for remediation using CC as a rapidly installed, low logistical footprint and environmentally friendly measure of mine water treatment work improvements.

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