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The correlation between the measured and modeled ClO3 concentrations was evaluated (Figure 13(b)). As for ClO2, the model tends to overestimate the residual ClO3 concentrations in 75% of the cases, compared to the measured concentrations in the real DWDS. Considering the root mean square error (Table 3), only one result showed a high error value (>0.100). Also in this case, the differences between the modeled and measured ClO3 concentrations were probably due to the aspects previously explained.

Table 3

Comparison between measured and modeled residual ClO3 concentrations, mean absolute error, and root mean square error, at 10 a.m. after one month from the start of the disinfectant dosing in both the DWTPs

Junction numberClO3 (mg L1)
Mean absoluteRoot mean
(sampling point)MeasuredModelederrorsquare error
79 0.073 0.100 0.024 0.026 
61 0.091 0.090 0.001 0.002 
145 0.068 0.090 0.023 0.023 
137 0.083 0.100 0.014 0.014 
125 0.061 0.100 0.043 0.043 
70 0.084 0.100 0.013 0.013 
124 0.093 0.150 0.053 0.053 
121 0.070 0.220 0.145 0.145 
148 0.063 0.160 0.099 0.099 
19 0.094 0.090 0.007 0.007 
116 0.102 0.100 0.006 0.006 
53 0.096 0.150 0.054 0.054 
Junction numberClO3 (mg L1)
Mean absoluteRoot mean
(sampling point)MeasuredModelederrorsquare error
79 0.073 0.100 0.024 0.026 
61 0.091 0.090 0.001 0.002 
145 0.068 0.090 0.023 0.023 
137 0.083 0.100 0.014 0.014 
125 0.061 0.100 0.043 0.043 
70 0.084 0.100 0.013 0.013 
124 0.093 0.150 0.053 0.053 
121 0.070 0.220 0.145 0.145 
148 0.063 0.160 0.099 0.099 
19 0.094 0.090 0.007 0.007 
116 0.102 0.100 0.006 0.006 
53 0.096 0.150 0.054 0.054 

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