New dataset released: Integrated Hydrological Units of the United Kingdom Submitted by Filip Kral on Wed, 18/02/2015 - 00:00 Our colleagues in the National River Flow Archive (NRFA) have released a new, freely available dataset of spatial reference units for hydrological purposes, called "Integrated Hydrological Units of the United Kingdom". Filip Kral explains more: Read more about New dataset released: Integrated Hydrological Units of the United Kingdom