Cellweb® – Keats Way – Tree Root Protection
- Location
- Keats Way, Rushden, Northamptonshire, NN10 6EE
- Contractor
- South Midlands Homes
- Consultant
- JPP Consulting Civil and Structural Engineers.
The Background
Following the recommendations in Arboricultural Practice Note 12 and BS 5837 2005 and 2012, three dimensional cellular confinement systems have been widely used as a no dig solution in the construction of new hard surfaces within root protection areas (RPA’s).
The use of an open structured granular infill material offers vertical and lateral water permeation and enables continued gaseous diffusion between the rooting environment and the atmosphere. More often than not, the system is installed on relatively level sites, and there is a perception that the system is unsuitable for anything other than level terrain.
In this case study we will look at how Cellweb® TRP has been used to overcome significant changes in levels within the RPA, while maintaining a healthy environment for tree roots.
The area of land to be developed could only be accessed from Keats Way and a new access road would need to be constructed. The only feasible route for the new road would pass through the RPA of a large Beech tree.
Our Client’s Requirements
Overcoming significant changes in levels within the Root Protection Area
Geosynthetics Limited were approached by JPP Consulting Civil and Structural Engineers regarding a new residential development on land off Keats Way, Rushden Northamptonshire.
Technical Requirements:
• 2.4m change in levels
• Curve Design
• Vegetated embankment face
Our Value Engineered solution
The Beech was considered to be of high amenity value and was to be retained within the new development, which meant that a ‘no dig’ tree root protection system would need to be used for the construction of the access road.
Any increase in levels within the RPA should be carried out and constructed to ensure continued water permeation and gaseous exchange to and from the rooting environment and the atmosphere. If this is not maintained and anaerobic conditions are created, it can result in root death and ultimately bring about the demise of the tree. To overcome this change in levels it required a build-up of 2.4m above the existing ground level at the most southern end of the RPA, reducing to 1.2m above the existing ground at the most northern point.
The Engineering department at Geosynthetics Limited calculated a site specific technical recommendation and proposed the solution that can be seen in figure 3. The solution shows how layers of 200mm depth Cellweb® TRP can be stacked on top of each other to increase levels. The system can then be terraced to create a gradual reduction in levels as the route progresses north towards the new development. This solution was adopted and a full design was carried out by JPP Consulting Civil and Structural Engineers.
It can be seen from this case study that with thoughtful design Cellweb® TRP can be utilised on far more challenging sites than previously thought.
This is particularly poignant at a time where we see increasing demand for development land, which places ever increasing pressure on our national tree stock. The benefits of trees are becoming increasingly recognised and it is important that we utilise engineered solutions to enable us to retain healthy trees as part of future developments.
The Beech tree in this case study now forms part of an ongoing programme to assess the health and vitality of trees which are subject to the construction of Cellweb® TRP systems.
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