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Aqualite water balance software user guide
Expanded Title:The BENCHLEAK software was developed through the WRC to provide a simple yet pragmatic approach to leakage benchmarking throughout SA. The work was so successful that it has been adopted and modified for use in many other countries including Australia, New Zealand and various other parts of the world. It seems likely that a similar approach will soon be introduced into Canada and the USA through work currently being undertaken by another consultant on behalf of the American Waste Water Association. The work undertaken in SA has been recognised as one of the key factors leading to the recent activity in this field and the BENCHLEAK Model is clearly the basis on which many new models have recently been developed around the world. The model has now been copied by many other individuals and organisations around the world and many improvements have been made to the methodology. This proposal basically involves creating a new DELPHI model which will supersede the previous BENCHLEAK Model and also virtually every other EXCEL based model being used internationally. This initiative will place the WRC model back at the leading edge of Water Audit software. MAIN RESULTS : An advance Delphi based software tool called AQUALITE EVALUATION : The objectives of the Software and the Manual are: • to introduce a standard terminology for components of the annual water balance calculation in line with the latest IWA methodology; • to encourage water suppliers throughout the world to calculate components of Non-Revenue Water, Apparent Losses and Real Losses using the standard annual water balance • to promote Performance Indicators suitable for national and international benchmarking of performance in managing water losses from public water supply transmission and distribution systems. The methodologies used in AquaLite draw strongly on recent recommendations of Task Forces of the International Water Association (IWA). It should be noted that the methodologies for quantifying water losses contained in the AquaLite model are not the only methods used worldwide. They are, however, well accepted and used extensively in many parts of the world and are rapidly being recognised as the most appropriate and pragmatic techniques for assessing the water balance components for potable water distribution systems. It should always be noted that every technique has its own inherent strengths and limitations, with corresponding sensitivities which impact on the results achieved. The practitioner and other users should be aware of the sensitivities and limitations when using the results of particular methods. The term ‘95% Confidence Limits’ has been used in the AquaLite model for expressing the highest likely margin of error for each Performance Indicator. It is important to note that the ‘95% Confidence Limits’ calculated will not relate to the pure statistical definition of ‘95% Confidence Limits’ since data entry will involve ‘best estimates’ for some water balance components and the estimation of the error terms as defined by the user will always be subjective to some degree. AquaLite also includes the calculation of the Unavoidable Annual Real Losses (UARL) as well as the use of the Infrastructure Leakage Index (ILI) as a key performance indicator. These two parameters are currently the subject of considerable attention and debate throughout the world and are being used in many countries. When used properly they can provided very useful information on the performance of a water distribution system but must be used with care to ensure that the results are meaningful since there are situations where the estimates can be misleading. They are fully described in this manual and the limitations on their use are clearly defined.
Date Published:01/08/2006
Document Type:Research Report
Document Subjects:Drinking water - Water supply, Drinking water - Water loss, R & D - Information technology
Document Keywords:Guidelines, Municipality, Urban and Peri-Urban
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 315/07
ISBN No:978-1-77005-599-5
Authors:McKenzie R
Project No:TT315
Organizations:WRP (Pty) Ltd; IWDC Ltd; Western Cape Nature Conservation Board
Document Size:7 768 KB
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