In the woods of Almere Haven I noticed this pole which shows the depht below the sea level we are living here in the polder.
It is - 3,30 meters below NAP (normaal Amsterdams Peil) or Amsterdam Ordnance Datum, which is a vertical datum in use in large parts of Western Europe. Originally created for use in the Netherlands, it was adopted by Prussia in 1879 under the name Normalnull and in 1955 by other European countries. For more explanation look here
I watched the incredible pictures of the devastations and floods in New York by hurricane Sandy in the US this morning and I hope everybody is safe and well.