Water Management Unit Topics: Water Information about the Northern Ireland Environment Agency's (NIEA) Water Management Unit (WMU) including guidance produced by the WMU and digital datasets which are available for downloading. More in this topic Groundwater Digital Datasets River Water Quality Monitoring NIEA has introduced online submission of manure export forms Information Requests About Water Management Unit Construction Method Statements Drainage Plans WMU Spatial Datasets NIEA Catchment Data Map Viewer