Ageing drinking water, stormwater and sewer pipe networks imply an increased degree of rehabilitation. The need for rehabilitation can be predicted using lifetime distribution functions together with current network age and material distribution. In Sweden, current age and material distribution is neither documented on a national level, nor for many water utilities on a local level. In this study, current network age and material distribution was provided through a questionnaire sent to Swedish water and wastewater utilities and the data provided were extrapolated to cover the whole of Sweden. The data were then combined with lifetime distribution functions to provide predictions. One limitation is that for newer materials the lifetime is still uncertain. Predictions were made for different scenarios to reflect local differences and the medium scenario shows that while the Swedish rehabilitation rate is stable, investments in monetary terms need to double in the next 60 years. The rehabilitation rate is also dependent on the extent to which the network is expanded. This method can be used to calculate national investment needs, and the results can also provide a basis for estimates for Swedish utilities with data scarcity.
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Research Article|
March 01 2013
Prediction of water and wastewater networks rehabilitation based current age and material distribution Available to Purchase
A. Malm;
1Gothenburg Water, Box 123, SE-424 23 Angered, Sweden
4Department of Civil and Environmental Engineering, Chalmers University of Technology, Water Environment Technology, SE-412 96, Gothenburg, Sweden
E-mail: [email protected]
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G. Svensson;
G. Svensson
2Luleå University of Technology and CIT Urban Water Management AB, Chalmers, SE-412 88 Gothenburg, Sweden
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H. Bäckman;
H. Bäckman
3Swedish Water & Wastewater Association, Box 47607, SE-117 94 Stockholm, Sweden
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Gregory M. Morrison
Gregory M. Morrison
4Department of Civil and Environmental Engineering, Chalmers University of Technology, Water Environment Technology, SE-412 96, Gothenburg, Sweden
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Water Supply (2013) 13 (2): 227–237.
Article history
Received:
March 14 2012
Accepted:
July 30 2012
Citation
A. Malm, G. Svensson, H. Bäckman, Gregory M. Morrison; Prediction of water and wastewater networks rehabilitation based current age and material distribution. Water Supply 1 March 2013; 13 (2): 227–237. doi: https://doi.org/10.2166/ws.2013.011
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