The water supply network is divided in 21 water distribution Zones (DMAs). The distribution of water through the network occurs by gravity. Each DMA is supplied with water through one point where measuring devices for flow and pressure are permanently installed. The measurements of the devices are transferred by telemetry to the central Surveillance, Control and Data Acquisition system. With the existing system we currently control the chlorination of water at the water reservoirs, the water supply to each DMA and the water pressure downstream of the pressure valves.