Page Content The following documents detail the regional Default Guideline Values (DGVs) for aquatic ecosystems of inland waters for each hydrological region.DGVs for aquatic ecosystems of Hydrogical regions documentsDGVs for Aquatic Ecosystems of Hydrological Region 1 (Tasmanian Inland Waters) (PDF 862Kb)DGVs for Aquatic Ecosystems of Hydrological Region 2 (Tasmanian Inland Waters) (PDF 861Kb)DGVs for Aquatic Ecosystems of Hydrological Region 3 (Tasmanian Inland Waters) (PDF 862Kb)DGVs for Aquatic Ecosystems of Hydrological Region 4 (Tasmanian Inland Waters) (PDF 862Kb)