Biodiversity

Even though Crossrail has been built through heavily populated areas of London, it has still had an impact on wildlife. The land surrounding our rail tracks, depots and stations supports a variety of wildlife.  The impacts of constructing the project were assessed as part of Crossrail’s Environmental Statement.

During the main construction period, the focus has been on protecting wildlife.  For example wild orchids, reptiles, newts and giant eels were all re-homed from the Stockley Junction area in West London, slow worms were moved from the Old Oak common worksite and fish rescues were carried out from the docks at Canary Wharf and the Royal Docks at Connaught Tunnel.  Biodiversity improvements have also been achieved in some areas as a result of the Crossrail Community Investment Programme which supports the local communities and environment.  For example a new wildlife habitat was created on a section of the river Lea.

As part of the completed works, we are also exploring opportunities to encourage greater biodiversity at several locations along the Crossrail route.

Wallasea Island

In a landmark partnership with the Royal Society for the Protection of Birds (RSPB), 3 million tonnes of material excavated from Crossrail’s tunnels and stations has been used to create a flagship wetland nature reserve at Wallasea Island in Essex. It will provide a home for tens of thousands of migratory birds, and combat the threats from climate change and coastal flooding.  The Crossrail material has been used to re-engineer the arable landscape and our construction teams have now breached the sea walls to create the new wetland landscape.

Water voles inhabit most of Wallasea Island’s main ditch and Soke Dyke systems and as our construction programme at the island included an extensive re-shaping of the existing water courses, the voles needed to be re-homed.

A total of 150 voles have been captured through organised ‘trappings’ and relocated under licence.  A paper published by the Chartered Institute of Ecology and Environmental Management (CIEEM) provides a summary of a large scale water vole displacement study that was undertaken at the Wallasea Island site in 2013 and 2014 in order to test the effectiveness of natural displacement and live cage trapping.  In addition, over 8200 common lizards and 30 adders have been rehomed as part of the works.

Biodiversity Accounting

The DEFRA methodology for accounting for biodiversity was developed after the construction works for Crossarail had commenced.   The accounting methodology is being used on the project as a way of describing the loss of biodiversity as a result of the project, with the aim of guiding proposals for restoring worksites that have been used for construction in order to increase biodiversity value.  On the surface sections of the Crossrail route, where the works are being predominantly undertaken by Network Rail, it is also being used to investigate the potential for off-site compensation.   The results of this work are presented in the Crossrail biodiversty accounting paper.

Summary Publication date Document Type

Biodiversity Accounting Report

Topic area: Biodiversity

In recognising the importance of understanding biodiversity losses, Crossrail undertook a study to assess and quantify the amount of biodiversity to be lost and gained as a result of development at seventeen of the Crossrail sites across London (Central Section). The Defra toolkit for calculating “biodiversity un...

09/07/2018 Micro-report

Excavated Materials Story

Topic area: Resource Management

The construction of the Crossrail project resulted in the generation of over 7 million tonnes of excavated material, of which over 98% was beneficially reused.  Crossrail adopted a client-led approach to the reuse of the material (whereby some of the destination sites and means of transportation were specified to cont...

31/03/2017 Micro-report

Environment Webinar – Beneficial Use of Excavated Materials

Topic area: Environment Webinar Series

This is the fourth in a series of Crossrail Learning Legacy webinars focused on the Environment Theme, in conjunction with our partners CIRIA and IEMA. The construction of Crossrail resulted in the generation of over 7 million tonnes of excavated material, of which over 98% was beneficially reused. Crossrail adopted a ...

02/02/2017 Video

General Ecology Management Plan

Topic area: Environmental Requirements

When the Crossrail Hybrid Bill was introduced into the House of Commons it was accompanied by an Environmental Statement (including the supporting Ecology Technical Specialist Report) which presented the outcomes of the ecological studies undertaken to identify and evaluate the features of ecological interest, the find...

26/02/2016 Good Practice Document