In water distribution systems the chlorine has the function both of reagent to contain local pollution phenomena and of indicator of water quality. The chlorine is subjected to different kind of reactions occurring either in the flow or near the wall, that cause the reduction of its concentration in pipes. The use of numerical models to simulate the chlorine concentration decay allows the interpretation of water quality parameters and the definition of adequate interventions to limit the pollution phenomena evolution. In this paper the calibration of the parameters of the chlorine decay law is carried out by using field data collected in a new sub-network of Palermo's city. The calibration of the parameters has been performed by the help of the commercial code EPANET and of an optimization model previously developed. The results obtained have highlighted that in order to accurately predict the chlorine concentration it is necessary to define the spatial distribution of the water quality parameters.
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