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