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In this case study, the operation costs correspond to approximately ¼ of the total network cost. Considering the case with is possible to see how the operational costs in percentage of the total cost for the 20 years used as the lifetime for the pumping system in the network. These results are presented in Table 5. It can be noted that in the first year the operation costs correspond to 2.86% of the total costs and in the 20th year, this percentage corresponds to 26.84%.

Table 5

Contribution of the operation costs in the total WDN cost

Year (US$)Percentage (%)Year (US$)Percentage (%)
48,942.86 2.86 11 415,034.38 19.98 
95,263.78 5.42 12 441,743.25 20.99 
139,103.23 7.72 13 467,021.30 21.93 
180,594.13 9.80 14 490,945.16 22.80 
219,862.30 11.68 15 513,587.39 23.60 
257,026.83 13.39 16 535,016.64 24.35 
292,200.39 14.95 17 555,297.89 25.04 
325,489.66 16.37 18 574,492.65 25.68 
356,995.58 17.68 19 592,659.12 26.28 
10 386,813.68 18.87 20 609,852.39 26.84 
Year (US$)Percentage (%)Year (US$)Percentage (%)
48,942.86 2.86 11 415,034.38 19.98 
95,263.78 5.42 12 441,743.25 20.99 
139,103.23 7.72 13 467,021.30 21.93 
180,594.13 9.80 14 490,945.16 22.80 
219,862.30 11.68 15 513,587.39 23.60 
257,026.83 13.39 16 535,016.64 24.35 
292,200.39 14.95 17 555,297.89 25.04 
325,489.66 16.37 18 574,492.65 25.68 
356,995.58 17.68 19 592,659.12 26.28 
10 386,813.68 18.87 20 609,852.39 26.84 

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