The water levels at the coast and in the Scheldt tidal zone are continuously measured. Under current situation you will find the latest measurements. Under tidal graphs you can view measurements from different locations in the same area (e.g. Lower Sea Scheldt river or Durme) in the form of a single clear graph. The values can be read simply by moving the mouse over the graph. A graph can be displayed or hidden by clicking on the name of the measurement series at the bottom.
Under normal circumstances, predictions for the upcoming 48 hours for the Scheldt tidal zone are made twice a day. A tidal prediction is made for high and low water in Antwerp, Dendermonde and Melle. When making predictions, the forecaster interprets all forecasts from various sources (Flemish and Dutch models, astronomical forecasts…). The values in the tidal predictions are, therefore, always more reliable than the model output in the graphs on the map. Tidal predictions are in fact always computed and verified manually. The tidal predictions can be found under predicted situation – short term.
The tide is determined primarily by the position of the earth, sun and moon, but higher or lower water levels can also be caused by the wind direction and wind speed. All these phenomena are taken into account to obtain an estimate, as accurate as possible, of the water level. Both high water and low water predictions are provided. High or low water always enters the Scheldt from the North Sea/Western Scheldt and then goes further inland.
When certain threshold levels in Antwerp are expected to be exceeded (e.g. at storm tide), the tidal predictions are refreshed up to five times a day. In addition, appropriate measures are taken by the water operator, such as the establishment of dyke monitoring, closing the gates in the Antwerp flood-retaining wall, preventive measures, etc. The colour codes of the forecast locations will then also change to yellow, orange or red (if the alarm threshold is exceeded).