Channel and slope protection, Clitheroe, Lancashire
|Location:||Henthorn Rd, Clitheroe, Lancashire UK|
|Client:||Taylor Wimpey plc / Barratt homes|
|Consultant:||Betts Associates Civil Engineering|
|Contractor:||X &P McGuigan|
|Products:||Erosaweb Geocell GWX100/300 (1000m2)|
Erosamat Type 3 (5000m2)
|Benefits:||- Speed of installation|
- Long-term protection
- Cost effective solution
- Helped achieve the desired visual appearance
The Taylor Wimpy and Barratt Homes development on Henthorn Road, Clitheroe presented the project consulting engineers with an interesting challenge.
Running across the development was an existing water course which required realigning and profiling. Part of the watercourse was channelled through a culvert with the remainder left as an open channel to form a green area within the development.
In order to maximise the available land for housing, the slopes of the culvert bank were to be as steep as permissible whilst taking into account the safety of the
The slopes of the channel were to be vegetated. Betts Associates, acting as the consulting engineer, deemed the inclusion of an erosion control mat necessary for the side slopes to prevent erosion of the topsoil before establishment of the vegetation.
During periods of heavy rainfall the water flow velocity down the face of the slope was considered a risk, so the use of a short–term biodegradable mat was discounted. The long lengths of the slope mean that the erosion control mat also needed an inherent tensile strength to withstand the load applied by top soil before the vegetation root structure was established.
The base of the channel would also need a system capable of withstanding high peak flows within the watercourse.
Having considered various options it was decided that Erosamat Type 3 erosion control matting offered the necessary performance requirements for the steep side slopes.
Erosamat Type 3 comprises a three dimensional structure of entangled filaments to create a long lasting, environmentally friendly, flexible erosion control mat. In combination with vegetation it forms both an effective erosion control surface and a vegetative root reinforcement layer.
The bottom of the channel required an alternative solution. Here ABG proposed Erosaweb geocell a geocellular system infilled with graded crushed stone. Used in water flow channels it dissipates energy by containing the granular fill and producing a rip-rap type performance.
Erosaweb geocell is a three dimensional honeycomb structure designed to strengthen infill materials by containing them within its open structure. In water flow channels, the geocell dissipates energy by containing the granular fill and producing a rip-rap type performance.
The ABG Service
ABG provided a holistic design by combining both Erosaweb and Erosamat
allowing engineers to achieve the desired visual effect for the channel
whilst ensuring the groundwork contractors could quickly and simply install the required protection.ABG are a market leading developer of high performance geosynthetic solutions for use in a wide range of civil, environmental and building applications.