Water Level Gauges indicate the water levels of rivers, canals, lakes and other bodies of water. The simplest devices consist of a vertical bar with dimensional scale.The starting point for the measurement is not the bottom of the watercourse, but the so-called level zero point. It is usually set just below the lowest water level to date. The water level therefore does not indicate the total depth of a water body.At low water, the level indicates whether the water level is still sufficient for ships with a certain draught. In addition, water levels are continuously recorded so that a warning can be issued in good time before flooding occurs.All major rivers in Europe are integrated into a close-meshed monitoring network. The most important gauges are equipped with remote data transmission and alarm indicators. In the event of flooding, the responsible authorities are automatically alerted.Austrian Danube:Gauge Wildngsmauer for the section between Vienna and Bratislava the water and shipping authority guarantees a water depth of 250 with gauge level 162. tap for link: WildungsmauerHungarian Danube:Gauge Budapest for the section until Budapest the water and shipping authority guarantees a water depth of 270 with gauge level 102. When tapping the link below, please go to Danube and check Budapest and find the appropriate information. tap for link: Budapest