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http://dx.doi.org/10.11001/jksww.2021.35.3.235

Correlation analysis of key operating indicators of waterworks with the Infrastructure Leakage Index (ILI)  

Jeon, Seunghui (Civil and Environmental Engineerin, Dankook University)
Hyun, Inhwan (Civil and Environmental Engineerin, Dankook University)
Kim, Dooil (Civil and Environmental Engineerin, Dankook University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.3, 2021 , pp. 237-246 More about this Journal
Abstract
The ILI, developed by the IWA (International Water Association), has been used in many countries as an indicator of water leakage. In Korea, the revenue water has been used as a performance indicator for waterworks although there is an opinion to replace it with the ILI. Hence, it has been necessary to investigate whether the ILI can replace the revenue water in Korea. The four main operating indicators (i.e., water service population, profit-loss ratio, fiscal self-reliance, and aged pipe rate) of 162 Korean waterworks were compared with the ILI with the linear regression method. Local water authorities with more than 1 million water service population, with more than 60% profit-loss ratio, more than 40% and less than 60% fiscal self-reliance, and more than 20% aged pipe rate showed meaningful correlation between the four parameters and the ILI. In the remaining cases, their correlations were little or weak. This means that using the ILI may not be an efficient method to represent the performance of the water supply system in Korea because of the lack of UARL (Unavoidable Annual Real Losses) data accuracy. To use the ILI in Korea, it will be required to carry out an additional research to accumulate reliable CARL (Current Annual Real Losses) and UARL data in the future.
Keywords
ILI; Water service population; Profit-loss ratio; Aged pipe rate; Fiscal self-reliance; Non revenue water;
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  • Reference
1 Delgado, D.H. (2008). Infrastructure Leakage Index(ILI) as a Regulatory and Provider Tool, Ph.D., thesis, University of Arizona.
2 Chung, S.H., Yu, M.J., Koo, J.Y. and Lee, H.K. (2006). Performance Evaluation of Water Loss Management in Urban Areas Using Different Performance Indicators, J. Korean Soc. Environ. Eng., 28(2), 117-127.
3 Jeon, S.H. (2014). A Study on ILI's Characteristics & Applicability for local cities in Korea, Master Thesis, Dankook University
4 Liemberger, R. (2002). "Do you know how misleading the use of wrong performance indicators can be?", Proceedings of the IWA Conference on Leakage management: A practical approach, Cyprus.
5 Liemberger, R. and Lambert A. (2008). Benchmarking of Water Losses in New Zealand Manual. NZWWA, Appendix G.
6 MOE. (2012). Waterwork's Statistics, 2011.
7 Ociepa, E., Mrowiec M., and Deska, I. (2019). Analysis of water losses and assessment of initiatives aimed at their reduction in selected water supply systems, water, Water, 11, 1037.   DOI
8 Pearsons, D. (2002). "Testing the UARL & ILI approach using a large UK data set", Proceedings of the IWA Conference on Leakage management : A practical approach, Cyprus.
9 Winarni, W. (2009). Infrastructure leakage index(ILI) as water losses indicator, Civ. Eng. Dimens., 11(2), 126-134.
10 Chung, S.H. (2005). Development of strategic evaluation methodology for performance of water losses management in water distribution system, Ph.D Thesis, University of Seoul.
11 MOE. (2010). Waterworks's design guideline, KWWA, Seoul.
12 Alegre, H., Hirner, W., Baptista, J.M., and Parena, R. (2000). Performance indicators for water supply services, IWA publishing 'Manuals of best practice' series.
13 Chung, S.H., Lee, H.K., Yu, M.J., Koo, J.Y., Hyun, I.H., and Lee, H.D. (2005). "Identification of key local factors influencing revenue water ratio of Korean cities using principal component analysis and clustering analysis", Proceedings of the IWA's 3rd International Conference on Efficient Use and Management of Water in Urban Areas, Santiago, Chile.
14 Lambert, A.O., Brown, T.G., Takizawa, M., and Weimer, D. (1999). A review of performance indicators for real losses from water supply systems, J. Water SRT-Aqua, 48(6), 227-237
15 Lambert, A.O., and Hirner, W.H. (2000). Losses from water supply system: Standard terminology and performance measure, IWA the Blue Pages.
16 Lenzi, C., Bragalli, C., Bolognesi, A. and Fortini, M. (2014). Infrastructure leakage index assessment in large water systems, Procedia Eng., 70, 1017-1026.   DOI
17 Park N.S., Bae, J.Y., Hyun, I.H., Kim, H.Y., and Yoon, J.H. (2002). "Review On Minimum Allowable Leakage And Leakage Rate Data", KSWW Annual Conference, KSWW, Chungju, Korea, 55-58.
18 Lee, K.H. (2012). Method to determine the average water pressure for the calculation of the minimum allowable leakage, Master's Thesis, Dankook University.