With this application, up-to-date Hydrological and Meteorological measurement data can be consulted in regards to water levels, current speeds, wave height, wind and visibility in the Rotterdam port area. The data come from monitoring networks in the port area that are managed by the Port of Rotterdam Authority and  
Rijkswaterstaat – (RWS - Ministry of Public Works). The Port Authority has systems in place that ensure the measurements are taken periodically and are made available via the AMETHYST database.

For up to date values measured only at RWS locations, click here: http://www.actuelewaterdata.nl/
Via this application, you can obtain the following information:
1.up to date values of measurements for all parameters at all locations in the port area 
2.a graph of 1 parameter at 1 monitoring location in the past 24 hours
3. a wind vane of 1 monitoring location with actual wind speed and direction

Parameters
The following parameters are included:

Water level    (in cm +/- NAP or “Amsterdam Zero”)
Water level (in cm +/- LAT or “Lowest Astronomical Tide”)
Wave height   (in cm)
Current speed   (in m/s)
Current direction (in degrees)
Wind direction  (in degrees) 
Wind speed   (in m/s)
Visibility  (in m) 
 
For conversion to the Beaufort scale, we refer to http://www.meteonet.nl/diversen/beaufort.htm.

LAT
International transition to LAT means in the long term that on the complete North sea the same reference level is used. By use of the lowest predictable value as a reference level and negative values will not occur anymore in the tide predictions. At average circumstances it will be always as deep as on the sea chart is mentioned.

Monitoring frequency
Every five or 10 minutes, a new measurement value is stored in Amethyst for each measuring instrument. The user cannot influence the period or frequency of the graphs.

Graphs/Wind vanes
Periodically, Amethyst creates a number of graphs of wind vanes and makes these available as a figure on the web site.
 
Automatic change
When a graph appears on the screen, it will continue to renew/update itself every five to 10 minutes. You can call up a graph by clicking in the detailed map on an icon for a location.

How do you consult the information?
There are two ways:
1. 
Select one of the parameters: water level, current, wave height, wind or visibility by clicking on one of the buttons. The standard setting is for “water level” to be activated. When you move the cursor over a particular button, an explanatory text will appear.
By clicking on the selection box “Show explanation”, or placing the cursor in the small map over the parameter icon, the detailed map will display the name of the location and the most recently obtained values recorded in all locations for that parameter. 
By scrolling through the large map, you can consult up to date values measured for all parameters in all locations in the port area.

2. 
Select one of the parameters: water level, current, wave height, wind or visibility by clicking on one of the buttons. The standard setting is for “water level (in cm +/- NAP or “Amsterdam Zero”)” to be activated.
Click in the rectangle on the large map and drag this rectangle to the desired area OR select a monitoring location from the alphabetical list of locations in the drop list.
Click in the bottom (detailed) map on the icon in the location you want: you will then be shown the graph for that location for the past 24 hours, and if you also selected the “wind” parameter, you will be shown a wind vane as well.

Breakdowns
If a monitoring instrument breaks down or communication with Amethyst fails, the graph concerned will not be complete. If certain processes around Internet Amethyst fail, the whole picture will not be renewed.

Questions
If you have questions about information provided on this page, please call the Water Systems department of the Port of Rotterdam Authority on telephone number (010) - 252 2185 or e-mail watersystemen@portofrotterdam.com

Disclaimer
It is very important to us to provide up-to-date and reliable information with a great degree of operational dependability. However, neither the “Stichting PortofRotterdam.com” nor the Port of Rotterdam Authority or Rijkswaterstaat can be held liable for any (in)direct damage resulting from errors in the published values, or from disruptions in the availability of the facility to consult this information.