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Abstract The work detailed here has sought to analyse the effects of emergency states on water-supply pipelines. For this purpose, a model hydraulic pipe network was created in Epanet 2, on the basis of actual operational data. Using the model, pipeline failures were simulated, and their effects described. The research methodology entails the simulated closure (i.e. failure) of individual pipes in the supply network, as followed by comparative analysis of the distribution of pressure across that network, in failure-free conditions and during a failure. The effects of failure in individual sections could thus be determined, in relation to the area with pressure lowered below the required value, the duration of that pressure reduction, and the potential number of recipients affected by limitation of water supply. The areas most exposed to pressure fluctuations in the water supply as a consequence of pipe-failure are thus pinpointed, with simulation results also serving in in the calculation of indicators for the risk of failure. Highlights • Operating data of the water network functioning in the city are used. • The areas most exposed to pressure fluctuations in the water supply as a consequence of pipe-failure are thus pinpointed. • The method presented, and the results it has generated, provide a basis for quantitative risk testing. [ABSTRACT FROM AUTHOR]

The subject of this paper is a failure analysis of water supply failure frequency in one of the cities in Poland. Operating data on the failure rate of water supply pipelines in the city were used. The analysis of water pipes' failures, including pipes diameters, their age, the material they are made from and their function in the water supply subsystem in the city was made. There is a noticeable downward trend in both the number of failures as well as the failure rates of water pipes. The value of failure rate indexes corresponds to national and international trends. The average failure rate for the main pipelines is λ Mavg = 0.98 km − 1 a − 1 , the distribution pipelines λ Ravg = 0.42 km − 1 a − 1 and the water connections — λ Pavg = 0.35 km − 1 a − 1 . The majority of failures (45.62%) happen in the distribution pipelines, representing about 53% of the total length of the pipelines. Detailed analysis of the water network failure should be a main element of the managing system of the urban water networks, particularly in strategic modernization plans. [ABSTRACT FROM AUTHOR]