Trunk mains are of critical importance to water suppliers. They are of high value and since they serve large numbers of customers can have a disproportionate impact on serviceability. Successful management of this group of assets is therefore vital to utility performance.
Ironically it is the very importance of trunk mains which often leads to their neglect - no-one is prepared to take risks with them, even the low risks involved in inspection and preventive maintenance.
This research undertook by WRc provided 9 Water Utilities with the means of assessing risks and managing them at acceptable levels. It produced a best practice document covering all aspects of trunk mains performance and a spreadsheet risk assessment tool.
The research addressed the following issues:
- Structural condition assessment and risk of failure
- Water quality, hydraulic design and performance
- Monitoring and quantifying leakage
- Rehabilitation and maintenance
- Commissioning and re-commissioning
- Managing the risk of ownership.
Provided a single reference document offering comprehensive advise based on practical experience. It provided a framework for determining and prioritising investment needs, enabling Utilities to achieve performance at justifiable cost. It thus helped satisfy demands of the Regulators and helped Utilities meet the challenge of common carriage.