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Drainage Design and Sewerage Undertakers

May 22, 2024

In terms of Drainage Design, it is important to understanding the intricate web of agreements governing infrastructure development. From pre-planning to post-planning stages, various applications and agreements with sewerage undertakers must be considered to ensure compliance and efficiency in drainage infrastructure.

Here, we explore the main steps and applications involved at each stage:

Pre-Planning Stage:

  1. Acquiring Sewerage Undertakers’ Asset Mapping: Accessing asset mapping from sewerage undertakers provides valuable insights into existing drainage infrastructure within and around the development site. Understanding the location and capacity of sewers, pumping stations, and other assets helps developers assess feasibility and plan drainage solutions that integrate seamlessly with the existing network.
  2. Pre-Planning Enquiry Application: Developers initiate discussions with sewerage undertakers through pre-planning enquiries. This allows developers to seek guidance and information on drainage infrastructure capacity, constraints, and requirements within a proposed development area. It helps identify potential challenges early in the planning process and informs subsequent design decisions.

Post-Planning Stage:

  1. Section 104 Agreements: Section 104 agreement of the Water Industry Act 1991 governs the process by which newly constructed sewerage infrastructure is adopted and maintained by sewerage undertakers. Developers must adhere to strict design and construction standards outlined in the agreement to ensure that the infrastructure meets the requirements for adoption. Sewerage Sector Guidance Appendix C – serves as the primary guidance for developers when planning, designing, and constructing foul and surface water drainage systems intended for adoption under Section 104 agreements.
  2. Section 106 Agreements: Section 106 agreement of the Water Industry Act (1991) grants developers the right to discharge foul and surface water into public sewers owned by local water companies, with the obligation to inform the sewerage undertakes in advance which will approve or defer based on capacity or connection standards. There are two types of Section 106 connections: direct, involving physical connections to public sewers, and indirect, using existing private drains. Even though indirect connections don’t involve physical alterations to public sewers, an agreement is still necessary to inform the water company about any change in the type or increased in flows from the development.
  3. Sewer Diversion Agreements: When existing sewers need to be diverted to accommodate development or infrastructure projects, sewer diversion agreements are made between developers and sewerage undertakers. These agreements outline responsibilities for diversion works and ensure minimal disruption to existing drainage infrastructure.

Navigating the complexities of drainage planning in the UK requires close collaboration with sewerage undertakers at every stage of the development process. By engaging early and proactively addressing drainage considerations, developers can ensure compliant, resilient, and sustainable drainage solutions. At Civilistix, we specialize in managing these applications with sewerage undertakers. We simplify your entire drainage design process!

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