Please note: In many cases, the station position in our database is accurate
to only one minute. Thus, the tide gauge may not appear to be on the coast.
ALL DUTCH METRIC DATA ARE MEASURED TO NAP (NORMAAL AMSTERDAMSCH PEIL) PRIOR TO 1936 VALUES BASED ON HIGH AND LOW WATERS OR ON 4 OR 8 READINGS/DAY
Documentation added 2011-02-10
From information received regarding the values of NAP pre. and post the re-levelling of 2005 the station has now been made RLR. RLR factor pre.2005 6.775m 2005 onwards 6.799m.
Documentation added 2016-01-22
The note above stating periods of the data are MTL is misleading. Sections of the original data were MTL. However, Pub. Sci. 5 states “For these periods a shallow water correction has been added to the mean heights of high and low water in order to give a mean height of sea-level comparable with those otherwise calculated for other periods.” Thus, a correction to MSL has already been applied.
Data Authority
Servicedesk Data Rijkswaterstaat Postbus 556 3000 AN Rotterdam