The NAP-visitors centre is closed.
https://www.normaalamsterdamspeil.nl/en/boek-kopen/
“Huddestone” dyke level stone restored
Recently the dyke stone benchmark (called the “Huddestone”) was restored. During the demolition of “De Nieuwe Brugsluis” in 1955 it was lost, but it was rediscovered during the construction of the metro in 2014. The image below show this historical marble stone both before its loss and after its rediscovery.
Amsterdam Ordnance Datum is of vital interest for all residents
Read the article in the district newspaper (Dutch only) (Stadsdeelkrant.pdf)
Sea level in Zeeland highest since 1953
During Thursday`s night on 6th of december 2013 the sea level rose to 3,99 meters (about 13,09 feet) above NAP. It was the highest level measured since the disaster of 1953 , when the water reached a level of 4,55 meters (14,93 feet) above NAP, the dykes breached in many places and more than 1800 people drowned.
The 25th anniversary of the NAP monument
Minister of Transport, Public Works and Water management Neelie Smit-Kroes opens the NAP monument on 18th May 1988
On 18th of May 2013, it was 25 years ago that the NAP monument was opened by the then Minister of Transport, Public Works and Water management, Mrs Smit Kroes.
The NAP-project was designed and realized by Louis van Gasteren and Kees van der Veer. The project was offered by the NAP-foundation on the occasion of the opening of the new Amsterdam City Hall (De Stopera). After a renovation and expansion with an exhibition, the NAP-monument was re-opened on the 12th of Oktober 2010 by the then Crown Prince Willem-Alexander.
Re-opening 12th Oct 2010