Abstract: This data shows the catchment outlines relating to the 134,000 nodes, representing ungauged locations, used in the Flood Studies Update (FSU) Programme. Using the OSi Digital Elevation Model, catchment outlines were derived for each of these nodes.

Purpose: The data has been developed to inform the Flood Studies Update (FSU) Programme. The FSU is a programme of research and development, undertaken by the Office of Public Works (OPW), to provide improved methods of extreme rainfall and flood estimation at both gauged and ungauged river locations in the Republic of Ireland.