“In-situ” filter drain recycling works successfully undertaken on M4

Crown Plus has concluded just under 7km of overburden removal and in-situ filter drain recycling on the east and west bound verges between J17 and 18 on the M4, as part of the National Highways Southwest Drainage Capital Spend allocation.

The in-situ works provide a more cost-effective and environmentally friendly solution and sees the steady move away from the conventional ‘dig out and replace’ methods of filter drain recycling. For these works approximately 4000t of existing filter drain material has been excavated and recycled all in situ, and as part of the operation approximately 3200t of type B drainage stone recovered for re-use into the works.

This approach provides a substantial saving on the conventional method due to both the environmental and health and safety benefits of the process. It is estimated that some 178 lorry movements are saved on this programme, drastically reducing the carbon footprint associated with vehicle movements and raw material supply.

Sebastian Mann, Project Manager for Highways & Drainage at Crown Plus says “It’s great to be part of this scheme, demonstrating the efficiency of our bespoke CR500 Recycling Machine and Crown Plus team in this sector. Despite the UK seeing some rather wet and stormy conditions during the early stages of the scheme the team provided a successful and timely conclusion to the programme, delivering on the cost and environmental savings as envisaged.”