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Table 10 presents the contribution of the operation costs to the total WDN cost during the 25 years considered as the lifetime of the pumping system. It can be noted that in the first year this contribution represents 9.33% and in the last year, 63.1%.

Table 10

Contribution of the operation costs in the total Itororó WDN cost

Year ($)Percentage (%)Year ($)Percentage (%)
18,512.99 9.33 14 206,001.73 53.39 
36,352.78 16.82 15 217,023.75 54.69 
53,543.85 22.94 16 227,644.96 55.87 
70,109.79 28.05 17 237,879.95 56.95 
86,073.33 32.37 18 247,742.76 57.94 
101,456.38 36.07 19 257,246.92 58.86 
116,280.04 39.27 20 266,405.48 59.70 
130,564.67 42.07 21 275,231.00 60.48 
144,329.85 44.53 22 283,735.58 61.21 
10 157,594.48 46.71 23 291,930.91 61.88 
11 170,376.76 48.65 24 299,828.23 62.51 
12 182,694.23 50.40 25 307,438.38 63.10 
13 194563,79 51.97    
Year ($)Percentage (%)Year ($)Percentage (%)
18,512.99 9.33 14 206,001.73 53.39 
36,352.78 16.82 15 217,023.75 54.69 
53,543.85 22.94 16 227,644.96 55.87 
70,109.79 28.05 17 237,879.95 56.95 
86,073.33 32.37 18 247,742.76 57.94 
101,456.38 36.07 19 257,246.92 58.86 
116,280.04 39.27 20 266,405.48 59.70 
130,564.67 42.07 21 275,231.00 60.48 
144,329.85 44.53 22 283,735.58 61.21 
10 157,594.48 46.71 23 291,930.91 61.88 
11 170,376.76 48.65 24 299,828.23 62.51 
12 182,694.23 50.40 25 307,438.38 63.10 
13 194563,79 51.97    

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