Water loss from urban water supply networks and the factors affecting it
Subject Areas : Operation Management in Water Systems
1 - Water Engineering and Hydraulic Structure, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
Keywords: leakage management, leakage flow, Water supply network, Pressure, Crack,
Abstract :
Water loss is a significant issue that leads to substantial damage to water resources, civil infrastructure, the environment, and water distribution companies. Urban water supply networks, particularly in regions with scarce water resources, face challenges related to water loss. Leakage from these networks constitutes a major portion of the overall water loss. Factors contributing to leakage include the aging of water supply systems, pipe damage due to soil stresses and urban traffic, fluctuations in water pressure, improper urban plumbing practices, and inadequate embankments. Examining factors such as pressure, pipe type, soil environment, and temperature can help identify the causes of leakage and effectively manage and mitigate its volume. Laboratory and field investigations have revealed that the leakage power, contrary to the pressure-leakage relationship, falls within the range of 0.5 to 2.79, with values exceeding 0.5 due to variations in pipe types, dimensions, and the type of cracks. Reducing the D50 (median grain size) of the soil and selecting an appropriate soil granulation around the pipes can effectively reduce the leakage flow rate. This article provides an overview of water wastage, its types, and underlying causes, followed by a discussion on the fundamentals of leakage calculation.
Ávila, C. A. M., Sánchez-Romero, F.-J., López-Jiménez, P. A., & Pérez-Sánchez, M. (2021). Leakage management and pipe system efficiency. Its influence in the improvement of the efficiency indexes. Water, 13(14), 1909. https://doi.org/doi: 10.3390/W13141909
Boudaghpour, S., & Sabooteh, S. (2020). Environmental leakage pollutions evaluations in urban water distribution network using unaccounted water principles (shokuhieh industrial town in Iran). Stavební Obzor - Civil Engineering Journal, 29(2), 219–228. https://doi.org/10.14311/CEJ.2020.02.0019
Cassa, A. M. (2005). A numerical investigation into the behaviour of leak openings in pipes under pressure. University of Johannesburg
Cassa, A. M., & Van Zyl, J. E. (2013). Predicting the head-leakage slope of cracks in pipes subject to elastic deformations. Journal of Water Supply: Research and Technology-Aqua, 62(4), 214–223. https://doi.org/10.2166/aqua.2013.094
Cassa, A. M., Van Zyl, J. E., & Laubscher, R. F. (2010). A numerical investigation into the effect of pressure on holes and cracks in water supply pipes. Urban Water Journal, 7(2), 109–120.
Farley, M., & Trow, S. (2003). Losses in water distribution networks. IWA publishing.
Farley, M., Water, S., Supply, W., Council, S. C., & World Health Organization. (2001). Leakage management and control: A best practice training manual. World Health Organization.
Ferrante, M. (2012). Experimental investigation of the effects of pipe material on the leak head-discharge relationship. Journal of Hydraulic Engineering, 138(8), 736–743.
Greyvenstein, B., & Van Zyl, J. E. (2007). An experimental investigation into the pressure-leakage relationship of some failed water pipes. Journal of Water Supply: Research and Technology—AQUA, 56(2), 117–124.
Iwanek, M., & Suchorab, P. (2017). The assessment of water loss from a damaged distribution pipe using the FEFLOW software. 15, 03006. https://doi.org/10.1051/ITMCONF/20171503006
Kanakoudis, V., & Tsitsifli, S. (2019). Water networks management: New perspectives. Water, 11(2), 239. https://doi.org/10.3390/W11020239
Karadirek, I. E., & Aydin, M. E. (2022). Water losses management in urban water distribution systems. In M. Bahadir & A. Haarstrick (Eds.), Water and wastewater management: Global problems and measures (pp. 53–65). Springer International Publishing. https://doi.org/10.1007/978-3-030-95288-4_6
Kingdom, B., Liemberger, R., & Marin, P. (2006). The challenge of reducing non-revenue water in developing countries—How the private sector can help: A look at performance-based service contracting.
Kourbasis, N., Patelis, M., Tsitsifli, S., & Kanakoudis, V. (2020). Optimizing water age and pressure in drinking water distribution networks. Environmental Sciences Proceedings, 2(1), 51. https://doi.org/10.3390/ENVIRONSCIPROC2020002051
Latifi, M., Naeeni, S. T. (Omid), & Mahdavi, A. (2018). Experimental assessment of soil effects on the leakage discharge from polyethylene pipes. Water Supply, 18(2), 539–554. https://doi.org/10.2166/ws.2017.134
Latifi, M., Parvaneh, R., & Naeeni, S. T. (Omid). (2022). Investigating the influence of surrounding soil properties on leakage discharge from cracks in polyethylene pipes. Engineering Failure Analysis, 141, 106676. https://doi.org/10.1016/j.engfailanal.2022.106676
Liemberger, R., & Wyatt, A. (2018). Quantifying the global non-revenue water problem. Water Science and Technology: Water Supply, 19, ws2018129. https://doi.org/10.2166/ws.2018.129
Mahdavi, M., Hosseini, K., Behzadian, K., Ardehsir, A., & Jalilsani, F. (2011). Leakage control in water distribution networks by using optimal pressure management: A case study. Water Distribution Systems Analysis, 1110–1123. https://doi.org/10.1061/41203(425)101
May, J. (1994). Pressure dependent leakage, world water and environmental engineering. Water Environment Federation: Washington DC, USA.
Mohsin, R., & Majid, Z. (2014). Erosive failure of natural gas pipes. Journal of Pipeline Systems Engineering and Practice, 5(4), 04014005.
Noack, C., & Ulanicki, B. (2008). Modelling of soil diffusibility on leakage characteristics of buried pipes. Water Distribution Systems Analysis Symposium 2006, 1–9.
Ociepa, E., Molik, R., & Lach, J. (2018). Assessment of water loss level on the example of selected distribution systems. 44, 00131. https://doi.org/10.1051/E3SCONF/20184400131
Pike, S. (2016). Experimental investigation of leakage-induced pipe erosion outside of pipe leaks. University of Cape Town.
Ribeiro, L., Sousa, J., Muranho, J., & Marques, A. S. (2018). Locating unreported leaks with modelling tools and pressure monitoring: A case study. 3, 1758–1749. https://doi.org/10.29007/79RG
Sadr-Al-Sadati, S. A., & Jalili Ghazizadeh, M. (2019). The experimental and numerical study of water leakage from High-Density Polyethylene pipes at elevated temperatures. Polymer Testing, 74, 274–280. https://doi.org/10.1016/j.polymertesting.2019.01.014
Tabesh, M., & Vaseti, M. M. (2006). Leakage reduction in water distribution networks by minimizing the excess pressure. Iran-Water Resources Research, 2(2), 53–0. (In Persian).
Thornton, J., & Lambert, A. (2005). Progress in practical prediction of pressure: Leakage, pressure: Burst frequency and pressure: Consumption relationships. Proceedings of IWA Special Conference’Leakage, 12–14.
Thornton, J., Sturm, R., & Kunkel, G. (2008). Water loss control. McGraw-Hill Education.
US EPA, O. (2015, August 19). Drinking water distribution systems [Overviews and Factsheets]. https://www.epa.gov/dwsixyearreview/drinking-water-distribution-systems
van Zyl, J. E. (2014). Theoretical modeling of pressure and leakage in water distribution systems. Procedia Engineering, 89, 273–277.
Van Zyl, Je., & Clayton, C. R. I. (2007). The effect of pressure on leakage in water distribution systems. Proceedings of the Institution of Civil Engineers-Water Management, 160(2), 109–114.
Walski, T., Bezts, W., Posluszny, E. T., Weir, M., & Whitman, B. (2004). Understanding the hydraulics of water distribution system leaks. In Critical Transitions in Water and Environmental Resources Management (pp. 1–10).
