Channel Lining | Church Village Bypass, South Wales, UK

Sustainable Drainage Solution for Church Village Bypass

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Before

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Project Overview

In February 2010, Concrete Canvas^{^®}GCCM (CC) was used to line a drainage channel in Church Village, South Wales. The slope was situated along the crest of a slope, and adjacent to a main road. In the previous year, Costain were appointed as the main contractor for the £90m Church Village Bypass scheme.

240m²

of CC8^™ used to line drainage channel at the crest of a slope

120

years durability BBA Certified for erosion control

years after installation, CC8^™ still performing as expected

Solution

The scheme involved the construction and introduction of two road bridges, four roundabouts, three community footbridges, two cattle grids and one subway, along with the installation of holding ponds and an extensive surface drainage network. The contractor aimed to use alternative materials, such as recycled aggregates, to minimise the impact on the local ecology and environment. Following approval from the Environment Agency, the Costain specified the CC GCCM for use within the drainage network.

CC8^™ is a Type II GCCM as defined in ASTM D8364, it is suitable for use on soil subgrades and was chosen for this project to suit the abrasion, wear and loading requirements. CC8^™ is also BBA certified with durability in excess of 120 years when used in erosion control applications.

Pre-Installation Conditions, CC Deployment, Cutting and Three-Section Longitudinal Lining

CC edges were captured in anchor trenches following installation

Anchor trenches were backfilled to prevent ingress

Design & Installation

CC8^™ Bulk Rolls specified
Vegetation removed and channel reprofiled
3 Layer Longitudinal layup
Screwed Joints
Perimeter edges secured in anchor trenches
Hydrated using water bowser and hose

Read Installation Guide

Termination of channel into stream

Completed installation

Summary

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Read Full Case Study

The Church Village Bypass scheme presented our team with a unique challenge. The location and nature of the works required the sensitive use of appropriate construction materials in order to minimise the impact on the local environment. Concrete Canvas provided a means of rapidly installation a low carbon concrete ditch whilst maintaining the natural aesthetic of the overall scheme.

Daniel Powrie CEng MICE, Project Manager Costain Group