HS2 Colne Valley: Sustainable Rail Infrastructure & Land Restoration

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Introduction

HS2 Ltd is creating new habitats on the northwestern edge of London, utilizing three million tonnes of chalk excavated during the construction of a 10-mile long tunnel. This project, known as the Colne Valley Western Slopes, will restore 127 hectares of former agricultural land into biologically diverse grassland.

Colne Valley Western Slopes Project

The Colne Valley Western Slopes project, part of the HS2 program, is designed to restore land to resemble the chalk downlands of the Chiltern Hills. The landscaped area, which lies on the Buckinghamshire-Hertfordshire border, will be seeded with plants that thrive in chalky soils.

Planting and Species

Over 50,000 native trees will be planted, including beech trees characteristic of the Chilterns, along with declining native species such as box and juniper. Environment manager Alice Williams highlighted the importance of expanding chalk grassland areas, crucial for biodiversity.

Excavation and Material Reuse

The construction of HS2’s tunnel under the Chilterns offered an opportunity to reuse excavated material. The tunnel took over three years to complete, producing three million tonnes of chalk. This project has increased Hertfordshire’s chalk grassland area by almost one-fifth, with chalk depths reaching up to 20 metres in some places.

Wildlife and Public Access

The new habitat, now in its second year of a three-year landscape creation phase, supports various flora and fauna. Bird species such as yellowhammer, skylarks, and red kites have been observed. The site is also home to at least 10 dragonfly species and rare butterfly species. The land, including cycle paths, bridleways, and viewing points, will be accessible to the public once HS2 is operational.

Conclusion

The HS2 project involves the restoration of 127 hectares of land into grassland, utilizing excavated chalk from the Chiltern Tunnel. The project will include native tree planting and create habitats for various wildlife species, with plans for public access.

Company Summary

HS2 Ltd: HS2 Ltd is responsible for the High Speed 2 rail project in the United Kingdom.

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