Management of water supply networks requires frequent control of distributedwater quality. Rich data sets of residual chlorine concentration are therefore oftenavailable. In this paper, the suitability of using such concentration data as tracers toget information about spatial distribution of water demand is investigated. To thisaim, a sensitivity analysis of the performance of a water quality model has beencarried out. Residual chlorine concentration data of hydraulic network of Giugliano inCampania, collected in 41 locations between November 2007 and February 2009 hasbeen used as target data set. The proposed methodology consists in dividing thenetwork into districts, each characterized by its own base demand. District basedemand multipliers are introduced in order to analyze the effects of water demanddistribution on the results of water quality model. The obtained results show highsensitivity of simulated chlorine concentrations to variations of district demandmultipliers. The best agreement between simulated and measured chlorineconcentrations is obtained with demand multipliers looking consistent with districturban destinations.
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