Free Guidance Notes on Apparent Losses
& Water Loss Reduction Planning
With 9 Appendices on specific topics
These Guidance Notes represent the collective experience and sustained efforts over a 10 year period of six international specialists who are committed to the ‘free to all’ dissemination of good practices in management of Non-Revenue Water. The Apparent (Commercial) losses component of NRW tends to receive less attention, with fewer easily accessible publications, than Real (Physical) losses. These Guidance Notes, with the accompanying 9 separate Appendices, and other freely available material on the LEAKSuite Outreach (App loss) webpage, seek to reduce that imbalance.
The Guidance Notes format of 1 main document and 9 Appendices has been used so that each of the 10 documents can be updated separately in future, or additional Appendices can be added. Any future changes will be documented on this webpage.
The Guidance Notes document contains Sections on Water Balance and Apparent Losses; Water Audit Component Analysis; Apparent Losses Indicators; Action Planning and Dynamics of Losses; and Economics of Apparent Losses. Each of the Sections has a set of References (some with weblinks to free papers). The Bibliography lists 74 papers and books. Each of the Appendices also has its own set of References.
The following websites also permit direct download of the following of these documents:
- The IWA Web Portal https://iwa-connect.org/#/group/water-loss/dashboard Guidance Notes only, in the Documents Section, by registered members of IWA Water Loss Specialist Group:
- The psEau Website bibliography http://www.pseau.org/outils/biblio/resume.php?d=6366&l=fr Guidance Notes and 9 Appendices
|APPENDICES||GUIDANCE NOTES ON APPARENT LOSSES AND WATER LOSS REDUCTION PLANNING||LATEST ISSUE||WEBLINK|
|Vermersch M, Carteado F, Rizzo A, Johnson E, Arregui F, Lambert A 77 pages||15 Sep 2016||GUIDANCE NOTES 2016L|
|Appendix 1||Non-Revenue Water and Large Water Meter Calibration. Johnson E 11 pages||15 Sep 2016||Paper AppLoss 2016H|
|Appendix 2||Non-Revenue Water and Unbilled Authorised Consumption|
Vermersch M, Carteado F, Lambert A 10 pages
|15 Sep 2016||Paper AppLoss 2016G|
|Appendix 3||Customer Metering Errors Arregui F 43 pages||15 Sep 2016||Paper AppLoss 2016J|
|Appendix 4||Apparent Water Losses generated by Unauthorised Consumption – Assessment and Corrective Actions Carteado F, Vermersch M 18 pages||15 Sep 2016||Paper AppLoss 2016B|
|Appendix 5||Non-Revenue Water and Errors throughout the Data Acquisition Process|
Vermersch M, Carteado F 21 pages
|15 Sep 2016||Paper AppLoss 2016K|
|Appendix 6||Non-Revenue Water and Revenue Collection Ratio: Review, Assessment and Recommendations Carteado F, Vermersch M 15 pages||15 Sep 2016||Paper AppLoss 2016A|
|Appendix 7||An Action Planning Model to Control Non-Revenue Water. Vermersch M, Rizzo A 12 pages||15 Sep 2016||Paper AppLoss 2007R
Presentation AppLoss 2018A
|Appendix 8||An Overall Dynamic Approach in Water Loss Reduction Vermersch M, Carteado F 10 pages||15 Sep 2016||Paper AppLoss 2010N
Presentation AppLoss 2018B
|Appendix 9||Change Management as an Indispensable Component when Planning for NRW Control|
Vermersch M, Rizzo A 9 pages
|15 Sep 2016||Paper AppLoss 2009F
Presentation AppLoss 2018C
The LEAKSSuite website gratefully acknowledges the voluntary contributions made by the Authors and others who drafted, edited and provided critical commentary during the development of the Guidance Notes and Appendices. More comprehensive Acknowledgements are made in the main Guidance Notes document.
If any Utility wishes to contribute data to an international set of ALIs (Apparent Losses Index, see Section 3.3.4 of main Guidance Notes document), please contact Author M. Vermersch.
If any errors are identified in the Guidance Notes or Appendices, please advise the LEAKSSuite website using Contact Us
15th September 2016