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CP329  Specification and Maintenance of Geocellular Underground SUD Storage Systems Asset Management
Project Appreciation and Objectives

Sewerage Undertakers are under pressure to adopt geocellular SUD storage systems that are located in public open space. This has created a need for both design specifications and greater understanding of their long-term operation and maintenance.

These systems normally comprise buried modular plastic structures, which are stacked into the required volume. Concerns regarding their ongoing maintenance liability include:

  • Deterioration in hydraulic performance e.g. from siltation within the storage; structure or clogging of media/perforated pipework feeding to and draining away from the structure;
  • Structural integrity, particularly where the excavated material is mounded over the buried storage to avoid the cost of its disposal;
  • Leak tightness;
  • Vulnerability of the materials to rodents, chemicals, oils, etc.;
  • Access to the structures for maintenance/repair operations.

This project will establish Sewerage Undertakers technical concerns; identify solutions, develop best practice guidance and prepare a draft Specification for design, installation, operation and maintenance.

Benefits to Clients

  • Clearer understanding of the issues and implications relating to adoption of geocellular SUD storage systems.
  • Access to a common technical specification for these assets.
  • Better understanding of their operation and maintenance to inform business decisions.

Work Programme

  1. Identify issues and implications.
  2. Review current designs, types, specifications and case studies.
  3. Identify/develop criteria for structural and hydraulic design
  4. Review current UK trials
  5. Develop best practice guidance for operation and maintenance.
  6. Develop a draft specification for design, installation, operation and maintenance.

Project Output

  • Report, to include best practice guidance
  • Draft Specification
  • Dissemination presentation/workshop for each participant.

Related WRc Work

  • Sewerage Detention Tanks - A Design Guide, 1997.
  • 10 year, ongoing, Portfolio programme of test development for sewerage rehabilitation
  • Sewers for Adoption/Sewers for Scotland technical specifications, 2006
  • Preparation and administration of Water Industry Specifications, ongoing.
WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

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