23f99eea-5240-4af8-accf-5948ef36dd34 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T11:47:57 creation ISO 19115 2016 Gunnedah Basin hydrogeological inventory 23f99eea-5240-4af8-accf-5948ef36dd34 This Gunnedah Basin dataset contains descriptive attribute information for the areas bounded by the relevant spatial groundwater feature in the associated Hydrogeology Index map. Descriptive topics are grouped into the following themes: Location and administration; Demographics; Physical geography; Surface water; Geology; Hydrogeology; Groundwater; Groundwater management and use; Environment; Land use and industry types; and Scientific stimulus. The Gunnedah Basin is an intracratonic, sedimentary basin in northern NSW. It forms the middle section of the greater Sydney-Gunnedah-Bowen Basin system and mainly consists of Permian and Triassic sedimentary rocks resting on Late Carboniferous to Early Permian volcanics. The Gunnedah Basin is overlain by the Surat Basin and the younger alluvial sediments associated with modern and ancient river systems. The Gunnedah Basin is not considered a single well-connected aquifer, rather a series of porous rock aquifers separated by several non-porous or poorly conductive layers. The Lachlan Fold Belt forms what is thought to be an effective basement although little information is known of its hydrogeological properties. All units of the Gunnedah Basin are of low permeability and significantly lower hydraulic conductivity than the overlying alluvial aquifers. Most of the groundwater resources in the area are extracted from either the overlying Surat Basin or younger alluvial aquifers. There is relatively little groundwater sourced from the aquifers of the Gunnedah Basin, except in areas where the overlying aquifers do not occur. The most viable groundwater source in the Gunnedah Basin are the more porous aquifers of the Triassic sequence. {"type": "Polygon", "coordinates": [[[148.4388, -32.4931], [151.0141, -32.4931], [151.0141, -29.4703], [148.4388, -29.4703], [148.4388, -32.4931]]]} 148.4388 151.0141 -32.4931 -29.4703 Basin Analysis EARTH SCIENCES ECOLOGY ENVIRONMENTAL SCIENCES Environmental Management Exploring for the Future GEOLOGY Groundwater Hydrogeology Land Use and Environmental Planning National Groundwater Sytems National Hydrogeological Inventory PHYSICAL GEOGRAPHY AND ENVIRONMENTAL GEOSCIENCE Published_External Sedimentology Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy) Download the report (pdf) [389.4 KB] documentDigital Download the report (pdf) [389.4 KB] PDF