Project Appreciation and Objectives
In England and Wales, OFWAT says that they 'continue to encourage water companies to control leakage effectively, with some companies expecting to reduce leakage by more than 8% during 2003 - 2010'. Many Utilities are finding it necessary to carry out increased levels of Active Leakage Control (ALC) and repair work to manage leakage levels. This leads to distribution mains replacement being proposed to reduce / prevent future increases.
Distribution maintenance is therefore likely to have a higher profile in reducing or stabilising future leakage levels with Utilities needing to: target mains renewals aimed at reducing leakage and/or burst rates; predict post rehabilitation performance, and select the appropriate rehabilitation option.
Previous research shows that mains replacement (over the last 5 years) is not guaranteed to yield significant leakage savings. This is a matter for concern, especially given high capital costs of mains replacement compared to ALC schemes. Many previous mains replacement schemes were aimed at drinking water quality improvements, but leakage levels are still difficult to predict following this significant capital expenditure.
This work will therefore develop a UK water industry database on rehabilitation and its impacts to enable better performance prediction and cost effective capital schemes.
- Cost effective capital planning through benchmarking to determine acceptable leakage levels following rehabilitation
- Benefits of mains replacement are consistently quantified across the industry
- The relative magnitude of Utility and customer side leakage is demonstrated
- Rehabilitation / replacement programmes are effectively targeted in the future
- Data for robust net present cost calculations based on realistic performance prediction.