Link to RLR information.
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 =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 08-Feb-2011 : Levelling information was received from Douwe Dillingh RLR was calculated for both before and after NAP re-levelling in 2005. RLR factors up to 2005 6.815m after 6.823m. =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Jan-2016 : The note above stating that 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.
Rijkswaterwstaat Postbus 5023 2600 GA Delft NETHERLANDS