Change proposal 015 - Sewerage Sector Guidance Appendix C - Design and Construction Guidance: Perforated plastic pipes
| Date | 29 August 2023 |
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Code for Adoption Agreements
1
Sewerage sector documents: Change proposal (Ref 015)
Modification proposal
Sewerage Sector Guidance Appendix C – Design and
Construction Guidance: Perforated plastic pipes
Independent Water Adoption
Panel Recommendation
The Panel recommended making a change but proposed using
an alternative approach
Decision
Ofwat has approved making a change using the alternative
approach recommended by the Panel
Publication date
39 August 2023
Implementation date
01 October 2023
Background
The British Plastics Federation (BPF) submitted this change proposal to the Independent
Sewerage Adoption Panel (the Panel) on 14 December 2022, with the Panel publishing the
proposal on its website on the same day. The function of the Panel is to consider change
proposals to the sewerage sector guidance and model sewerage adoption agreement (the
Sewerage Sector Documents) which apply to companies operating wholly or mainly in
England. These documents were developed by companies as required by the Code for
Adoption Agreements (the Code) and came into effect in April 2020. A change proposal is
defined in the Code as a proposed change to the sector guidance or the model adoption
agreements.
The change proposed by BPF concerns the use of perforated plastic pipes (PPPs) for
infiltration trenches and filter drains. The BPF states that the current Sewerage Sector
Documents Appendix C – Design and Construction Guidance (DCG) can prevent wastewater
companies from accepting the use of PPPs in designs. This is due to the material standards
that are set in the DCG for the use of thermoplastics in watertight systems being applied to
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