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INfrastructure The Manual became a reference standard for transportation and related infrastructure owners and operators together with government departments and local authorities. The key driver for the use of a common reference standard on scour was and remains the ‘in common’ nature of engineered assets located in a river or estuarine environment where the impact and mitigation of scour effects is an instrumental part of responsible asset management. This consideration overrides the differences between certain asset types and the legal, commercial and safety regimes, which dictate their operational surety. Among the major infrastructure client, owner, stakeholder and operator groups including the Highways Agency, Network Rail, the Railway Safety and Standards Board (RSSB), the Environment Agency and British Waterways (now the Canal & River Trust) have commissioned studies, which have enabled a better understanding of scour for purposes of design, mitigation and maintenance of their asset base. However, the extent of changes to standards and practice ranges from little change, applying the same methodology as with the Highways Agency (2012) to more substantive changes as with Network Rail. British Waterways (now the Canal & River Trust) has commissioned a more practical study involving underwater inspection. Internationally, important work has been undertaken in the USA, Switzerland, Austria, New Zealand and Australia, which has yet to be assessed as to UK relevance, but will be as part of the publication update. 20 New guidance Over recent years, CIRIA has been asked to consider updating the original manual following discussions with major infrastructure client, owner, stakeholder and operator groups. So, in March 2012 a meeting was convened with representatives from Network Rail, RSSB and the Highways Agency joining practitioners from Mott MacDonald, HR Wallingford and JBA Consulting to discuss the scope and coverage of an update. Following this meeting CIRIA developed a full proposal and set about securing the necessary funding to allow the project to start, and appointed a research contractor team in December 2012. CIRIA are now working with a project steering group of funders and representatives of other stakeholder groups, and the research contractor team – a consortium of Mott MacDonald, HR Wallingford and JBA Consulting to update the original guide. Conclusion So, scour is not a new phenomenon, but given the ongoing challenges faced in maintaining a stock of ageing asset the work of HR Wallingford as part of FUTURENET, and that of CIRIA’s project to provide guidance are vital to allow the right intervention decisions to be made in a period of financial uncertainty. References HIGHWAYS AGENCY (2012) “The assessment of scour and other hydraulic actions at highway structures”. In: Design manual for roads and bridges, vol 3, section 4, Part 21, BD 97/12, Highways Agency, London. Go to: www.dft.gov.uk/ha/ standards/dmrb/vol3/section4/bd9712.pdf MAY, R, ACKERS, J and KIRBY, A (2002) Manual on scour at bridges and other hydraulic structures, C551, CIRIA, London (ISBN; 978-0-86017-551-3). Go to: www. ciria.org ROCA, M (2013) “Assessing scour risk on bridges”, Innovation & Research Focus, Issue No. 93, May 2013, Thomas Telford, UK. Go to: www.innovationandresearchfocus.org.uk ROCA, M and WHITEHOUSE, R (2012) “Scour risk at river crossings”. In: Proc 6th International Conference on Scour and Erosion (ISCE6), 27–31 August 2012, Paris, pp 1519–1526. Go to: http://eprints. hrwallingford.co.uk/562/ Links Adaptation and Resilience in a Changing Climate – Coordination Network: www. arcc-cn.org.uk/ CIRIA (2013) Update of manual on scour at bridges and other hydraulic structures (RP978): www.ciria.org/service/scourmanual Engineering and Physical Sciences Research Council (EPSRC): www.epsrc.ac.uk Future Resilient Transport Networks (FUTURENET): www.arcc-futurenet.org/ Innovation & Research Focus: www. innovationandresearchfocus.org.uk Project update Following a consultation workshop held in summer 2013 the research team are now working to take the development of the revised Manual forward. It is anticipated that the revised Manual will be published in July 2014. To find out more about the project, please contact Philip Charles at CIRIA, on: +44 (0) 20 7549 3300 or email: philip.charles@ciria.org


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