About WRc | Portfolio Programme | Help | Contact Us  
Portfolio Logo WRc
Home New Ideas New On Site New Starts Proposed
Your List

Asset Maintenance
Asset Management
Business Planning
Business Processes
Carbon Footprint
Carbon Management
Catchment Management
Climate Change
Customer Service
Data & Information
Data Management
Demand Management
Distribution Management
Drinking Water Quality
Emergency Planning
Energy Efficiency
Environmental Management
Environmental Policy & Legislation
Investment Planning
Leak Detection
Metering & Charging
Odour Management
Operating Costs
Pipeline Materials
Real Time Control
Receiving Water Quality
Resource Management
Risk Assessment
Risk Management
Spatial Information
Strategic Planning
Supply Demand Management
Technology Development
Underground Assets
Waste & Resource Management
Waste Management
Wastewater Treatment
Water & Wastewater
Water Distribution
Water Quality
Water Resources
Water Treatment
Water Treatment Waste
Water Use

Printer Friendly VersionSelected Information - Completed Research

CP468  Sewer Blockage Clearance - Good Practice Guidance Sewerage
Project Appreciation and Objectives

There were approximately 220,000 blockages in UK sewerage undertakers' sewers in the year ending March 2011. Many of these incidents led to internal property flooding or external flooding.

Research has identified that good blockage clearing practice leads to reductions in repeat blockages. However, improvements have not always been sustained and poor practice by contractors working for householders can also lead to blockages being passed downstream into the public sewer system.

Blockage clearance carried out close to buildings runs the risk that poor practice can actually cause internal flooding of the building, especially when it is not possible to work from a downstream manhole when using jetting equipment. The recent transfer of responsibility to the sewerage undertakers for many small sewers and lateral drains includes the transfer of this risk if good practice is not applied.

The introduction of the Service Incentive Mechanism (SIM) has given greater weight to the need to 'get it right first time' and to minimise impact on customers. Good practice to avoid repeat visits is now more vital than ever. This project will:

  • Identify the most effective blockage clearance practices
  • Develop effective good practice guidance, for management, supervisors and operatives involved in blockage clearance

Benefits to Clients

  • Improved operatives competency. This will include clearance practice on small diameter systems.
  • Consistent response and approach to blockage clearance.
  • Improved regulatory performance and relationship with customers.

Work Programme

  1. Scoping and review of current practices, including discussions with contractors and equipment manufacturers.
  2. Rodding and blockage clearance field trials.
  3. Developing recommended practice and production of guidance.
  4. Reporting and end of project dissemination seminar

Project Output

  • A Blockage Clearance and Sewer Cleaning Code of Practice
  • A short video to explain the recommended practices and a quick reference guide, both aimed at blockage clearance crews
  • A project report explaining the recommended practices and the reasons for these recommendations. This is aimed at operations managers and their contracting partners
  • A dissemination workshop

Related WRc Work

  • Dealing with Sewer Blockages (1993 -1995)
  • Sewer Jetting, Code of Practice 2nd Edition (2005 - 2006)
  • Understanding Blockages: in Small Diameter Pipes (2005 - 2007); and in Typical Section 24 Sewers (2006 - 2007)
  • Fats Oils and Greases (2005 - 2009) and Flushable Products (2006 - ongoing)
  • Reduced water usage on sewer solids movement, (2009)
WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

More details...

About WRc | Portfolio Programme | Hot Topics | Help | Contact Us