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Design Guidance

The 4th editions of "Sewers for Scotland" and "Water for Scotland" are available to download below.

The below two appendices to WfSv4.0 (Appendix O and Appendix Q) are still in draft form, but are included here for your information. These will be finalised and incorporated into WfSv4.1 as part of its release in July 2019.


The documents provide updated guidance for all standards and specifications required when designing new water or drainage infrastructure. All new designs received, from 1st January 2019 will be expected to align with these new design documents.

Sustainable Urban Drainage Systems

Our revised version of ‘Sewers For Scotland’ contains all information required to design and manage surface water through the use of SUDS. The document can be viewed or downloaded below.

Note: Access to Scottish Waters Standards and Specification (S&S) documents referenced in SfS3 and WfS3 is in development.  If you require a copy of S&S documents please make a request via standardsinfoline@scottishwater.co.uk.

SUDS for Roads design guidance

The "SUDS for Roads" design guidance is available to download below. If you are interested in receiving a hard copy, please email SUDSforRoads@SEPA.org.uk.  

If you have any questions in relation to these new documents, please contact our Customer Connections team.

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Sewer for Scotland 4th Edition

31/10/2018
8 MB PDF
Preview | Download

All new designs submitted in relation to development in Scotland, that previously applied WfS3 and SfS3, will now need to comply with WfSv4.0 and SfSv4.0 as of 1st January 2019.

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Water for Scotland 4th Edition

11/02/2019
3 MB PDF
Preview | Download

All new designs submitted in relation to development in Scotland, that previously applied WfS3 and SfS3, will now need to comply with WfSv4.0 and SfSv4.0 as of 1st January 2019.

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SFS and WFS Training Slides

07/08/2015
12 MB PDF
Preview | Download

These training slides will assist users of WFS and SFS documents.