SUDS treatment train assessment tool

Christopher Jefferies, Alison Duffy, N. Berwick, N. McLean, A. Hemmingway

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    This paper outlines a rationale and scoring system for the stormwater treatment train assessment tool (STTAT) which is a proposed regulatory tool for Sustainable Urban Drainage Systems (SUDS). STTAT provides guidance and regulatory consistency for developers about the requirements of planners and the Scottish Environment Protection Agency (SEPA). The tool balances the risks of pollution to the receiving water-body with the treatment provided in a treatment train. It encourages developers to take SUDS into account early, avoiding any misunderstanding of SUDS requirements at the planning stage of a development. A pessimistic view on pollution risks has been adopted since there may be a change of land use on the development in the future. A realistic view has also been taken of maintenance issues and the ‘survivability’ of a SUDS component. The rationale for STTAT as a response to the requirements of the Water Framework Directive is explored and the individual scores are given in tabular format for receiving water and catchment risks. Treatment scores are proposed for single SUDS components as well as multiple components within treatment trains. STTAT has been tested on a range of sites, predominantly in Scotland where both development and receiving water information was known. The operational tool in use by SEPA is presented.
    Original languageEnglish
    Title of host publicationProceedings 11th International Conference on Urban Drainage, Edinburgh, Scotland, UK, 31 August-5 September 2008
    Number of pages10
    Publication statusPublished - Aug 2008
    Event11th International Conference on Urban Drainage - Edinburgh International Conference Centre, Edinburgh, United Kingdom
    Duration: 31 Aug 20085 Sep 2008
    Conference number: 11th (archived website of the conference)


    Conference11th International Conference on Urban Drainage
    Abbreviated title11 ICUD
    Country/TerritoryUnited Kingdom
    Internet address


    • Regulation
    • Guidance
    • Treatment train
    • Sustainable urban drainage
    • Environmental risk


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