Project Appreciation and Objectives
WRc has carried out several studies investigating the impacts of distribution mains rehabilitation on nightlines and repair rates. The most recent of these yielded guidance useful for PR09 submissions and was supported by UKWIR. The recently completed work provides an understanding of how interventions impact on leakage levels and failure rates.
In AMP4, mains interventions are increasingly being done in areas with high leakage and/or burst rates (as quality programmes become completed). This trend is likely to continue, yielding further vital data. This study will harness this critical information and help participants to:
- Improve the targeting of mains renewals to reduce leakage and/or burst rates;
- Predict post-rehabilitation performance.
- Select the most appropriate option for quality-driven distribution mains rehabilitation.
The above are essential for current AMP4 work, preparation of PR09 submissions and AMP5 implementation programmes.
Benefits to Clients
- Ensure well-targeted interventions, through the use of guidelines for pre-intervention assessments and database outputs.
- Understand the best (and average) levels of performance achievable from a range of intervention options.
- Benchmarks will be developed for acceptable leakage levels following rehabilitation.
- Understand, through targeted site work, the relative magnitude of utility and customer side leakage.
- Help provide realistic predictions of future performance and improve the robustness of any future net present cost calculations and other economic assessments.
This project will build on the data collection and analysis methodologies already developed and will include:
- Specification and collection of flow, pressure, asset stock and repair data at DMA level.
- Collection of data at selected sites to existing protocols.
- Analysis of flow and repair data to quantify the impacts of a range of intervention options.
- Report detailing the findings of the study.
- Database (and viewing tool) with all relevant flow, pressure, repair and asset stock data.
- A forum for regular (quarterly) meetings at which participants can exchange experiences in this area.
- Previous Portfolio projects investigating the links between rehabilitation and the performance of the distribution system, CP135 & CP135a, 2005-2007.
- Development of the Waterfowl whole life costing software which predicts/assesses future cost of ownership of groups of rehabilitated and non-rehabilitated mains. 1998-2002.