The EU Water Framework Directive (2000/60/EC) (WFD) establishes a framework for the protection, improvement and management of surface waters and groundwaters. The Subcatchment dataset is built on clusters of river water body polygons and are entirely contained within the Catchment polygons dataset. All Subcatchments are represented as polygons
https://data.gov.ie/dataset/water-framework-directive-water-subcatchments?package_type=dataset