Hydrology Monthly Bulletin 

One of the EPA’s goals is to make environmental information available to the public and our stakeholders in a timely and accessible manner.  In May 2020, we started to publish a monthly national hydrology bulletin.   

The bulletin provides a factual summary of river flows, lake levels, turlough and groundwater levels for the previous month. It includes a comparison to the long-term historic monthly values. 

Example of Hydrology Bulletin Maps

The bulletin also contains:  

  • Graphs showing river flow and water levelfor a sample of the surface water and groundwater hydrometric stations across Ireland 
  • NEW: Graphs showing turlough levels from several GSI sites
  • Maps which show how flows and levels at stations across the country compare to the average for the month
Hydrology Bulletin Graph Examples

The hydrometric data used in the publication are produced from the EPA/local authority and OPW hydrometric networks.  The weather summary information contained in the bulletin is provided courtesy of Met Éireann. 

Read the Hydrology Summary Bulletins below.

measuring flow
Hydrology Summary Bulletin

May 2024

Hydrology Summary Bulletin for May 2024 outlining the flows in rivers, rainfall, lake levels, turlough levels, groundwater levels and spring outflows of over 300 stations across Ireland.

Learn more

Find EPA/LA Hydrometric data on HydroNet.

Find provisional water level only data from OPW hydrometric stations on waterLevel.ie and archived water level and flow data from OPW hydrometric stations on Hydro Data.

Find information and turlough and borehole level data from GSI hydrometric stations on gwlevel.ie.

Access to this month’s Met Éireann and historic weather statements.