Welcome to the waterlevel.ie website provided by the Office of Public Works


The waterlevel.ie website provides you with real-time access to data that has been recorded by the Office of Public Works (OPW) hydrometric network. The primary focus of the site is the transfer of water level data, however, additional parameters such as water temperature are presented as a by-product of water level data collection. The OPW hydrometric network extends to approximately 380 stations located on rivers, lakes and tidal locations throughout the Republic of Ireland. Not all of these stations are presented on the website.

Processed hydrometric data can be accessed through the Hydro-Data website:

www.opw.ie/hydro Website.

It is important that you read carefully all of the notes provided below.

If you have any queries or comments concerning the use of the site or the data provided, please feel free to contact us.


The site is designed to be simple and easy to use.

A stations map is presented on the left of the homepage. Each station is represented by a station node on the map, by placing the cursor over any of the nodes on the map, the station name is presented to the bottom right of map. Zoom functions are available to the top right of the map.

In order to view available station data, simply click on the node. This produces a range of parameter options. Again, click on the desired parameter to select.

The stations are also presented as a list to the right of the map. The stations are listed by assigned name, or reference number. To select a station, simply click on the desired station to produce a range of parameters available for the selected station. Again, then click to select the desired parameter.

To list the stations by any of the list headings i.e. alphabetically, numerically or otherwise, simply click on the desired heading and the stations will sort accordingly.

A quick search / filter option is available to the right of the map, in the search / filter box above the station list. Stations can be filtered by various criteria including station number, station name, river, catchment, River Basin District (RBD) or hydrometric region.


Provided below for information is a brief description of the equipment and methodologies that have been used in collecting and presenting the hydrometric data that is available on the site.

3.1 Water Level Recording

The water level data is collected using data loggers. A data logger digitally records the water level at set time intervals using a pressure transducer immersed into the water body or by using an ultrasonic receiver.

The water levels are recorded as water depths (stage) above a staff gauge zero level. A staff gauge is a graduated plate that allows our Field Technicians to manually check that the correct water level is being displayed on the recording devices, and hence validate the data recorded. The zero level of the staff gauges have been surveyed to either Poolbeg or Malin Head Ordnance Datum levels, and in some cases, these heights are added to the recorded levels (stage) to provide water levels to an Ordnance Datum. It is important that you check which datum level is being used for each site accessed.

The data recorded on the data logger is transmitted using telemetry. The telemetry systems utilise Global Packet Radio System (GPRS) to transfer data from the station logger to a web server, where it is configured and presented on the waterlevel.ie website.

The equipment can malfunction or breakdown, and therefore gaps may appear in the records provided. These gaps must be considered when evaluating the data, and in particular peak or low water levels.

It should be noted that the water level data presented on this site is unchecked, and has NOT been subjected to any quality processes. Caution should be exercised in interpretation or use of supplied data.

3.2 Water Temperature Recording

Water temperature is collected as a by-product of the water level collection process. This is to provide greater accuracy of water level recording through application of temperature compensation within the pressure transducer sensor. It should be noted that water temperature data presented on the website has not been calibrated or been subjected to any quality processes. Caution should be exercised in interpretation or use of supplied data.

It should also be noted that sensors are deployed in a variety of ways aimed at recording accurate water levels, e.g. within stilling wells, within conduits laid on the river bed, etc. The deployment will greatly affect how well the temperature recorded reflects the ambient temperature of the water body.

3.3 Flow Data Recording

A number of hydrometric stations are fitted with side looking acoustic doppler profiler (ADP) devises. These instruments continuously monitor water velocity as well as a number of other operational parameters. These instruments make it possible to present flow data in real-time as the flow estimation calculation is undertaken at point of data collection. It should be noted that flow data and associated by-product parameters presented on this website have not been subjected to standard quality processes. Caution should be exercised in interpretation or use of supplied data.


The data that can be presented on the waterlevel.ie website is limited due to the primary operational data transfer function of the website. A 5 week rolling window of data is presented. The full hydrometric archive of processed data is available on the Hydro-Data website, see link above. The Hydro-Data website presents a range of data types including station meta-data, mapping, instantaneous data, sub-daily data series, summary statistics, and annual maxima series.


5.1 Data Quality

5.2 Independent Verification

The operations of the Hydrometric Section of the OPW are quality assured and have been certified under ISO 9001: 2008 by the National Standards Authority of Ireland. While the quality management procedures include quality control of data, this does not apply to data presented on the waterlevel.ie website as real-time provision of data does not facilitate application of normal quality processing procedures. The data presented on the site contains no guaranteed accuracy, and users must undertake independent quality control and verification procedures appropriate to any proposed use. To this end, calibration data is available for graphical presentation and download from the Hydro-Data website.


Please read carefully the following statements and conditions of use of the data.

The User has read in full, understands and accepts all of the above notes and warnings concerning the source, reliability and use of the data available on this website.

The User agrees that the Commissioners of Public Works have the absolute right to reprocess, revise, add to, or remove any data available on this website as they deem necessary, and will in no way hold the Commissioners of Public Works liable for any damage or cost incurred as a result of such acts.

The User will use any data available on this website in an appropriate and responsible manner and in accordance with the above notes, warnings and conditions.

The User understands that the Commissioners of Public Works do not guarantee the accuracy of any data available on this website, and it is the User’s responsibility to independently verify and quality control any of the data used and ensure that it is fit for use.

The User will not pass on any data used from this website to any third party without ensuring that said party is fully aware of the notes, warnings and conditions of use.