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Table 5

Real loss between the conventional method and the proposed method

YearPeriodMonthMethodDN100 cast iron pipe
DN100 steel pipe
Error (%)
Real loss (m3)NbReal loss (m3)Nb
2008 1–3 952,000 35 596,151 26.13a 
1,200,810 188 492,288 82 17.42b 
4–6 631,028 29 280,287 10 82.51a 
1,151,710 189 508,537 84 81.43b 
7–9 249,768 14 168,784 12 387.92a 
1,218,662 177 497,633 78 194.83b 
10–12 770,691 21 161,926 12 59.16a 
1,226,623 182 426,349 66 163.3b 
1–6 3,166,058 64 1,752,878 18 24.88a 
2,378,467 224 1,011,927 92 42.27b 
7–12 2,040,919 35 661,421 24 20.48a 
2,458,897 196 929,054 78 40.46b 
1–9 5,498,392 78 3,135,670 30 34.34a 
3,610,198 241 1,515,302 96 51.68b 
12 1–12 10,413,955 99 4,828,598 42 53.42a 
4,850,432 260 1,946,722 96 59.68b 
YearPeriodMonthMethodDN100 cast iron pipe
DN100 steel pipe
Error (%)
Real loss (m3)NbReal loss (m3)Nb
2008 1–3 952,000 35 596,151 26.13a 
1,200,810 188 492,288 82 17.42b 
4–6 631,028 29 280,287 10 82.51a 
1,151,710 189 508,537 84 81.43b 
7–9 249,768 14 168,784 12 387.92a 
1,218,662 177 497,633 78 194.83b 
10–12 770,691 21 161,926 12 59.16a 
1,226,623 182 426,349 66 163.3b 
1–6 3,166,058 64 1,752,878 18 24.88a 
2,378,467 224 1,011,927 92 42.27b 
7–12 2,040,919 35 661,421 24 20.48a 
2,458,897 196 929,054 78 40.46b 
1–9 5,498,392 78 3,135,670 30 34.34a 
3,610,198 241 1,515,302 96 51.68b 
12 1–12 10,413,955 99 4,828,598 42 53.42a 
4,850,432 260 1,946,722 96 59.68b 

Note: C indicates the conventional component analysis of leakage. P indicates the proposed method using growth functions. Nb indicates the number of leaks that have been used to calculate real losses.

aThe calculation errors of real losses between the conventional method and the proposed method for DN100 cast iron pipes.

bThe calculation errors of real losses between the conventional method and the proposed method for DN100 steel pipes.

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