QMark: ecological appraisals in transport schemes

16th February 2017


Related Topics

Related tags

  • Business & Industry ,
  • Built environment ,
  • Planning ,
  • Transport ,
  • Management

Author

Jonathan Buckwell

Mike Gibbs, senior ecologist at Atkins describes how to carry out preliminary ecological appraisal of low-impact, large-scale transport infrastructure schemes.

Ecological specialists play a crucial role alongside engineers in the design and construction of transport infrastructure renewals and upgrades. Ecologists are often called upon to provide an assessment of the effects of renewals, upgrades or maintenance works over lengthy railway or highway schemes where the impacts of the works are localised and intermittent.

This article explores an approach to proportionate preliminary ecological appraisal of large-scale, linear transport infrastructure projects where impacts are localised within the transport corridor. Examples include renewals and upgrade of railway signalling infrastructure, or installation of new gantries and technology on motorways, where impacts are localised and intermittent, but extend for many miles. For these schemes, the effect on the conservation status of notable habitats or protected species is rarely significant.

Safety issues

The safety of the surveyors is an important issue when planning surveys of transport infrastructure. To visit railways or highways requires appropriate training, authorisation, and safety planning. Access to some locations may require rail or road closures, often at night when a visual ecological survey is inherently difficult, and so is not recommended.

Desk study

A great deal of information can be gained from a thorough ecological desk study, including locations of protected species, landscape connectivity, and potential biodiversity hotspots. The desk study is a particularly important stage of this proportionate approach, and field surveys should confirm evaluations made at this early stage. Wildlife records within an appropriate distance from the route should be requested from county record centres. The government’s MAGIC website should be consulted for information about designated sites and notable habitats. Ordnance Survey (OS) maps and online aerial photographs should be used to identify habitat within and next to the scheme. If available, high resolution aerial photographs and drive-through video footage of the scheme should be studied.

Ground-truthing and habitat mapping

The next step is to check potentially important ecological features previously identified during the desk study on the ground. Ground-truthing is a process of confirming the presence of potentially important features during walkovers. Notable habitats should be confirmed and an assessment of the suitability of habitats for protected species should be carried out. This should be undertaken from outside the railway or highway boundary, using public rights of way, thereby avoiding safety issues.

Building a database

The use of Geographical Information System (GIS) is beneficial for large-scale, linear schemes as the information from the desk study and ground truthing exercise can be added to it, and the results viewed at various scales, and overlaid on OS maps and aerial photos. The background database upon which the GIS map is based can be easily edited, and the data can be built up and corrected over time. The ecological data should be presented either as maps at any scale, or as an electronic database for consultation by the client or a contractor throughout the project, as part of an overall environmental management plan (EMP). Hand-held Global Positioning System (GPS) mappers and data-loggers can save time as the data can easily be downloaded to a GIS mapping programme.

Example of broad habitat mapping for rail corridor

Localised constraints survey

The final stage of this approach to preliminary ecological appraisal is to carry out targeted localised constraints survey at specific locations where significant effects could occur based on a preliminary assessment of the impacts of the works and to survey for ecological features that cannot be identified remotely. The most significant effects could occur at locations where civil engineering is required to create signal or gantry foundations. Relatively minor works such as cabling do not usually have a significant ecological effect. Localised constraints survey should also be targeted at designated sites, notable habitats, or where protected species are present or next to the site.

Typical motorway verge habitat on the M25 in Surrey

Conclusion

This article describes a proportionate and cost-effective approach to preliminary ecological appraisal for large-scale, low-impact, linear transport schemes; based on a prediction of potential ecological constraints formulated during a desk study, supplemented by ground-truthing, and confirmed during localised survey. This method should only be carried out by experienced ecological surveyors.

There may be situations where this pragmatic approach is not appropriate, such as Ecological Impact Assessment (EcIA) for a planning application, where more detailed survey is required in order to accurately assess the impacts. However, this approach provides a pragmatic and innovative service for transport organisations facing the challenge of providing efficient ways of maintaining and upgrading the railway and highway networks.

Typical motorway verge habitat on the M25 in Surrey


Acknowledgements

I would like to thank Octavia Neeves MCIEEM, senior ecologist (signalling) at Network Rail for her comments on this article and her contribution to the formulation of this approach to survey.

Subscribe

Subscribe to IEMA's newsletters to receive timely articles, expert opinions, event announcements, and much more, directly in your inbox.


Transform articles

Majority of environmental professionals fear green skills gap

Almost three-fifths of UK environmental professionals feel there is a green skills gap across the country’s workforce, or that there will be, a new survey has uncovered.

4th July 2024

Read more

Three in five British adults want more public involvement in the planning system, which could be at odds with Labour’s plans to boost economic growth, IEMA research has found.

3rd July 2024

Read more

Ahead of the UK general election next month, IEMA has analysed the Labour, Conservative, Liberal Democrat, and Green Party manifestos in relation to the sustainability agenda.

19th June 2024

Read more

Nine in 10 UK adults do not fully trust brands to accurately portray their climate commitments or follow the science all the time, a new survey has uncovered.

19th June 2024

Read more

Just one in 20 workers aged 27 and under have the skills needed to help drive the net-zero transition, compared with one in eight of the workforce as a whole, new LinkedIn data suggests.

18th June 2024

Read more

Consumers are flexing their purchasing power in support of more sustainable products and services. Dr Andrew Coburn, CEO of sustainability intelligence and analytics firm, Risilience, considers the risk of greenwashing and sets out three key steps businesses can take to avoid the pitfalls and meet the opportunities of changing consumer demand.

18th June 2024

Read more

With a Taskforce on Inequality and Social-related Financial Disclosures in the pipeline, Beth Knight talks to Chris Seekings about increased recognition of social sustainability

6th June 2024

Read more

While biodiversity net gain is now making inroads, marine net gain is still in its infancy. Ed Walker explores the balance between enabling development and safeguarding our marine environment

6th June 2024

Read more

Media enquires

Looking for an expert to speak at an event or comment on an item in the news?

Find an expert

IEMA Cookie Notice

Clicking the ‘Accept all’ button means you are accepting analytics and third-party cookies. Our website uses necessary cookies which are required in order to make our website work. In addition to these, we use analytics and third-party cookies to optimise site functionality and give you the best possible experience. To control which cookies are set, click ‘Settings’. To learn more about cookies, how we use them on our website and how to change your cookie settings please view our cookie policy.

Manage cookie settings

Our use of cookies

You can learn more detailed information in our cookie policy.

Some cookies are essential, but non-essential cookies help us to improve the experience on our site by providing insights into how the site is being used. To maintain privacy management, this relies on cookie identifiers. Resetting or deleting your browser cookies will reset these preferences.

Essential cookies

These are cookies that are required for the operation of our website. They include, for example, cookies that enable you to log into secure areas of our website.

Analytics cookies

These cookies allow us to recognise and count the number of visitors to our website and to see how visitors move around our website when they are using it. This helps us to improve the way our website works.

Advertising cookies

These cookies allow us to tailor advertising to you based on your interests. If you do not accept these cookies, you will still see adverts, but these will be more generic.

Save and close