Knowing high and low water times is of vital importance for seafarers, who must deal with shallow waters and sandbanks. The Flemish Hydrography measures water levels at the tide measuring stations located in Nieuwpoort, Oostende, and Zeebrugge. Long-term measurements form a basis for computing the tide forecasts. These forecasts are published every year in tide tables for Nieuwpoort, Oostende, Blankenberge, Zeebrugge, Vlissingen, Prosperpolder, Antwerpen, and Wintam.
The tide data for Vlissingen is supplied by Rijkswaterstaat Netherlands. The tide data for Prosperpolder, Antwerpen, and Wintam is provided by the Hydraulic Laboratory in Borgerhout.