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Table 1

Descriptive statistics of the failure rate indexes λ of the tested water pipelines in the multi-year period of 2007–2017

ZoneDescriptive statistics
Minimum (failure·km−1·month−1)Maximum (failure·km−1·month−1)Mean (failure·km−1·month−1)Median (failure·km−1·month−1)Standard deviation (failure·km−1·month−1)Coefficient of variation (–)Kurtosis (–)Skewness (–)
0.00 0.12 0.02 0.00 0.02 1.67 5.09 2.06 
0.00 0.40 0.08 0.05 0.08 1.05 2.13 1.33 
0.00 0.12 0.03 0.02 0.03 1.06 0.94 1.17 
0.00 0.37 0.08 0.06 0.09 1.21 0.59 1.16 
0.00 0.28 0.04 0.03 0.05 1.28 5.16 1.98 
0.00 0.19 0.06 0.04 0.05 0.82 0.18 0.83 
0.00 0.24 0.04 0.02 0.05 1.18 4.86 1.88 
ZoneDescriptive statistics
Minimum (failure·km−1·month−1)Maximum (failure·km−1·month−1)Mean (failure·km−1·month−1)Median (failure·km−1·month−1)Standard deviation (failure·km−1·month−1)Coefficient of variation (–)Kurtosis (–)Skewness (–)
0.00 0.12 0.02 0.00 0.02 1.67 5.09 2.06 
0.00 0.40 0.08 0.05 0.08 1.05 2.13 1.33 
0.00 0.12 0.03 0.02 0.03 1.06 0.94 1.17 
0.00 0.37 0.08 0.06 0.09 1.21 0.59 1.16 
0.00 0.28 0.04 0.03 0.05 1.28 5.16 1.98 
0.00 0.19 0.06 0.04 0.05 0.82 0.18 0.83 
0.00 0.24 0.04 0.02 0.05 1.18 4.86 1.88 
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