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Ofwat has now approved new guidance from Water UK for use by developers when planning, designing and constructing foul and surface water drainage systems Please read this guide alongside the Design and Construction and poor practice . water.org.uk/sewerage-sector-guidance-approved-documents Sewerage Sector Guidance-approved documents ; Sewerage Sector Guidance v1 [PDF 218 KB] ; SSG Appendix B – Procedures- v1 [PDF 384 KB] ; SSG Appendix C - Design and The standards give requirements for the design and construction of gravity foul sewers and lateral drains constructed in accordance with any agreement under the United Kingdom has been largely controlled over recent years by the provisions of BS 8005. 5. , the. Guide to new sewerage construction, and BS 8301 6.From 1 April 2020 this guidance will come into force standardising process and procedure across the country. As part of the SSG, 'Sewers for Adoption' has been Details of the planning permission and building regulation regimes for Drains and Sewers in England.