The purpose of this paper is to provide a data validation/reconstruction of flowmeters that allow to determine the annual economic and hydraulic efficiency of the water transport network of Aigües Ter Llobregat (ATLL) Company corresponding to the 80% of the overall water transport network in Catalonia (Spain). The economic/hydraulic network efficiency is based on the daily data set collected by ATLL using about 200 flowmeters of the network. The data collected using these sensors are used by the remote control and information storage systems and it is stored in a relational database. All the information provided by ATLL is analyzed to detect inconsistent data using an automatic data validation method deployed in parallel with the evaluation of the network efficiency. As result of the validation process, corrections of flow measurements and of the volume of billed water are introduced. The results of the water transport network of ATLL obtained during the year 2010 will be used to illustrate the approach proposed in this paper.

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