Major pollution risk for sewerage undertakers. Effective diagnosis of failures can significantly reduce further failures.
Sewer rising mains are a high risk asset group with a failure rate ten times higher than for gravity sewer collapses. A single main will often fail a number of times. A failure is also much more likely to cause pollution. It is estimated that rising mains failure cost the UK water industry over £60 million per year in direct costs. Fines have recently been increased and can be in excess of £1 million for a Category 1 or 2 pollution incident. To reduce fines companies need to demonstrate that they have adopted good practices to limit the risk of rising mains failure. Where a failure occurs companies need a practical solution to ensure that optimum decisions are taken in line with best practice in order to limit the risk of further failures and pollution incidents.
BUSINESS BENEFITS TO CLIENTS
- A significant reduction in the number of rising mains failures leading to savings of £30 million per year nationally.
- Reduced likelihood of prosecution and reduced fines from a reduction in repeat failures and an ability to demonstrate good practice management practices.
- Reduced customer impact thereby improving customer SIM scores.
- A review of rising mains failure mechanisms.
- Development of a defect classification system and pipe material identification guide to allow the correct failure mechanism to be diagnosed.
- Review of relevant test and investigation methods available to provide more detailed diagnosis.
- Development of a practical web-based application to guide users through the diagnosis process.
- Support of the for draft application tool during a nine month trial.
WRc will carry out this project in association with Don Ridgers, an independent consultant with extensive experience in this area.
- A reduction in the number of rising mains bursts leading to savings of £30 million per year if adopted nationally.
- Reduced risk of prosecution from rising mains failures and reduced fines.
RELATED WRc WORK
- New Sewage Rising Mains Inspection Methods, CP371, 2009-11.
- Manual of Sewer Condition Classification 5th edition 2014.
- Various rising mains failure investigations.
- SRM website 2008 & 2013.