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Title: APPLIED PRESSURE MANAGEMENT TECHNIQUES FOR CONTROLLING LEAKAGE IN ATHENS, GREECE

Author: S. Kanellopoulou

Year: 2009

Publisher: European Water Resources Association (EWRA)

Description:

The purpose of this paper is to present the results, experiences and conclusions obtained so far after the application of advanced pressure management techniques (flow or time modulation) in the complex water supply network of Athens, within the overall effort aiming to efficiently provide water to the consumers and to control leakage. The operation of the Athens water supply network which has a total length of 9.000 km, has always been based on pressure management. Therefore, there are 220 pressure zones from which 140 are supplied through pressure reducing valves. Until few years ago, no specific actions were taken regarding leakage control. After the completion of several projects, EYDAP SA decided to apply advanced pressure management techniques by installing hydraulic or electronic control devices to further control the pressure reducing valves. Two years after implementing these techniques in selected zones, the level of service to customers has been upgraded due to the minimization of bursts (in most cases almost “elimination”) and the efficient provision of water (with adequate pressure during the day and the min required during the night), eliminating the consumers complaints. Simultaneously, a drop in the minimum night flow (MNF) was recorded in most zones and a reduction in the mean daily consumption was also achieved. The payback period in all cases was estimated to be a few months only.