Water Mains & Services & Leakage 

The impact of reductions in leakage levels on reported and detected leak repair frequencies

Reference: 19/WM/08/68
ISBN: 978-1-84057-877-5
Published Date: 27/09/2019

This project investigated the impact of reducing leakage levels on the average frequencies of bursts and other identified leaks, including the proportions which are reported by the public and others, compared with those that are detected by Active Leakage Control.  The project included analysis of data sets supplied by several water companies.  There was no clear evidence in the data reviewed of an offsetting of increased detected leaks by fewer reported leaks as leakage is reduced.  As a result the total number of leak repairs would be expected to increase.  Water companies should factor the costs associated with additional detected leak repairs into the cost of leakage reductions.  Water companies should also monitor the number of leak repairs in parallel to the leakage level to ensure accurate budgeting of the full costs of leakage reduction. Data should be collated centrally with access provided where required for analysis.

Price: £200  

Treated Water Storage Assets: Good Practice for Operation & Management Version 2

Reference: 19/RG/05/50
ISBN: 978-1-84057-871-3
Published Date: 14/08/2019

The purpose of this project is to provide water companies with good practice guidance for the whole life management of the construction, refurbishment, repair, operation and maintenance of treated water storage assets. Such guidance is mapped to the UKWIR Framework for Expenditure Decision Making in order to help asset managers, operators and capital investment planners better inform investment decisions to manage water quality risks.

The project was developed in conjunction with significant industry engagement, through two industry workshops involving representatives from UK Water Companies, Regulators, Academia and Industry, and five water company interviews. 

The project deliverables consist of:

  • a guidance document summarising good practices for the inspection, operation, maintenance, refurbishment, repair and new construction of treated water storage assets; and
  • a complementary spreadsheet toolkit illustrating a process to support investment planning activities for treated water storage assets through a condition assessment, deterioration and risk modelling approach.

Please note that this report – ‘Treated Water Storage Assets: Good Practice for Operation and Management – Version 2’, reference number - 19/RG/05/50 replaces the previous version (17/RG/05/48). The majority of the revisions made are to the sections on ‘external roof membranes (section 10.11)’ and ‘intelligent membranes (section 13.4.4)’ plus the associated table in Appendix 5. Please destroy or delete any copies of the previous version of the report that you have.

We apologise for any inconvenience this may cause.

Price: £150  

The Impact of Burst-Driven Mains Renewals on Network Leakage Performance

Reference: 18/WM/08/67
ISBN: 1 84057 863 7
Published Date: 23/11/2018

A burst-driven renewal programme can achieve a reduction in burst frequencies leading to a reduction in the natural rate of rise (NRR) of leakage. This results in a reduction in the optimal survey frequencies, in turn reducing the costs of active leakage control (ALC) to maintain leakage at the current level. Understanding the full impacts on a range of key performance indicators (KPIs) for a DMA improves will help the industry to take a full totex view of benefits of future investment and allow existing asset management models to be calibrated appropriately.

This study assessed the historic impact of burst-driven mains renewal (mains only) on the operational costs of leakage management on DMA network performance. A representative industry dataset of 487 burst-driven mains renewal schemes from four Water Service Providers (WSPs) was included. Data was normalised to mitigate variation linked to operational, geographic, and climate differences between WSPs. The normalised dataset was used to build non-linear models to predict the performance of KPIs at the level of DMA based on DMA characteristics and current performance.

KPI performance was successfully modelled for each of NRR, total DMA mains repair numbers, mains repairs numbers of renewed sections, leakage, minimum achieved leakage, and supply interruptions.

This report details the new model development and approaches to quantify and optimise the targeting of burst-driven mains renewal programmes by application of individual company data sets. The findings have been incorporated into an Excel tool for ease of application to individual company data sets to support investment planning and optimisation.

Price: £150  

Mains Cleaning Good Practice Report

Reference: 18/WM/18/7
ISBN: 1 84057 858 0
Published Date: 21/07/2018

The purpose of this UKWIR project was to gather information to identify and review the effectiveness of mains cleaning interventions and to develop evidence based best practice approaches to mains cleaning, inclusive of planning, design, costs, customer management, delivery and post-project assessment. The project produced:

(i) A Mains Cleaning Good Practice Guide document to provide guidance on the planning and implementation of mains cleaning strategies and interventions and a Decision Support Tool to assist users in selection of appropriate cleaning techniques and technologies for a particular application.

(ii) A Mains Cleaning Good Practice Report which presents the work that was carried out during this project and summarises the information gathered. The report provides conclusions and recommendations based on the finding of the project.

Price: £500