English: Observation of the water level and the astronomical tide in Vlissingen during the surge of 1953. Subtraction of both gives the surge level
Nederlands: Waarneming van de waterstand in Vlissingen tijdens de stormvloed van 1953, evenals het berekende astronomische getij. Bijde lijnen vanelkaar afgetrokken levert de windopzet (windeffect)
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.