SUDS Working Group update


Scottish Water are launching an update of their design manual – Sewers for Scotland 4.0 which will go live for all new developments from January 2019. This document replaces Sewers for Scotland 3 that the Landscape Institute, SEPA and SNH commented on and requested alterations by way of written comments and a workshop. The alterations requested were to bring the document in line with the CIRIA Manual and place-making policy.

Scottish Water have added end of pipe swales and filter trenches but have not yet added in conveyance swales and filter trenches, which is disappointing. There is a further review of Sewers for Scotland planned for 2020.

Note for Landscape Professionals
Scottish Water take note of every variation requested from their standard specification, so the way forward for us is to ensure that landscape consultants make Scottish Water aware each time a conveyance swale, filter trench or other SuDS feature not included in Sewers for Scotland would be the best solution for the site. In this circumstance, the consultant should request a waiver from The number of waivers requested will influence the outcome of the review in 2020; if we can generate a demand for change, through the waiver process, then we will achieve improvement to Sewers for Scotland.

Julie Waldron, working through the National SUDSWP group will continue to put pressure on Scottish Water (along with SNH and SEPA) to move to using the CIRIA Manual as a standard.

City Blueprint has just been launched as a joint project between SEPA and SW. The idea is to use blue/green infrastructure to reduce the amount of surface water in the combined sewers as many are reaching capacity. Pilots schemes are being set up. The LI through SUDSWP has offered assistance in writing the brief for consultants and hopefully this will be taken up.

Building with Nature is a new assessment system for Green Infrastructure being launched in Scotland, known as. It has come to Scotland from England where it has been set up by the Gloucester Wildlife Trust and University of the West of England. Any project, whether at Local Development Plan stage, Planning in Principle or detailed planning, can be put forward for assessment. There is clear guidance provided on a wide range of standards that together make up the assessment; the emphasis is on truly multi-functional green infrastructure that contributes to effective placemaking. A design project could gain a full award once built. The assessors from the Wildlife Trust would engage with Client and designers, and the client would need to pay for the process. As a pilot scheme, 5 projects in Scotland have been assessed; this pilot included one PPP application in Edinburgh. Designed by Ian White Associates Landscape Architects and AREA Urban Design, this not only achieved the award but was put forward as a possible exemplar site. It has been designed with conveyance swales in the knowledge that these might be acceptable in the near future.

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