Among the many factors affecting water supply system failures are the weather conditions that change over the year. Since this is an important research issue, as part of this study, investigation of water supply system failure seasonality by the selected statistical approaches was presented. The basis of the research was monthly number of the pipelines' failures from the multi-year period of 2007–2017 of the municipal water network located in southern Poland. Mann–Kendall test results proved decreasing seasonal trend of the failure rate indexes λ. In turn, the results of the Colwell indexes' calculations allowed it to be stated that seasonal course of the water pipelines' failure events can be relatively easy to predict. As it turned out, it is difficult to determine unambiguously the impact of a given period of the year on the water pipeline failure events' occurrence. However, greater failure-free operation of the water pipelines may be expected in spring and summer months than in autumn and winter months. Because using Colwell indexes for seasonality analysis has no limitations compared to other methods, Colwell indexes may be considered as reliable tools for the assessment of the seasonal course of the water pipelines' failure events.

影响供水系统故障的众多因素中，有一年中不断变化的天气条件。由于这是一个重要的研究问题，因此，作为本研究的一部分，提出了使用所选统计方法调查供水系统故障季节性的方法。研究的基础是位于波兰南部的自2007年至2017年的多年供水管线自2007年至2017年的多年故障管道数量。Mann–Kendall测试结果证明了失效率指标λ的季节性趋势呈递减趋势。反过来，Colwell指数的计算结果可以说明，输水管道故障事件的季节性过程可以相对容易地预测。事实证明，很难明确确定一年中给定时间段对输水管道故障事件的影响。但是，与春季和冬季相比，春季和夏季，输水管道的无故障运行可能会更大。因为与其他方法相比，使用Colwell指数进行季节性分析没有任何限制，所以Colwell指数可以被视为评估输水管道故障事件的季节性过程的可靠工具。