Abstract
Abstract In Japan, leakage of water from water distribution networks amounts to more than 15% of the total outflow from reservoirs. For reduction of leakage, some means is necessary to regulate the pressure in the network as low as possible under the constraint that water is smoothly delivered to all users. In consequence, it is now strongly desired to establish means of advanced real-time control to maintain the pressure closely to 2 atm., the recommended value in Japan, against fluctuations of consumptions. A trial of such a control of a decentralized type was started in some supply zones of a middle-sized city in Japan. The control is actually working well, but its accuracy is slightly worse than expected. This paper is concerned with improvement of accuracy of the control: Through analysis of detailed data gathered in some supply zones, simulation studies by use of a reduced model of a supply zone and an analytical investigation to determine the values of parameters of the current control scheme, new schemes for improving the accuracy are developed.
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