Hydrogeological Landscapes of New South Wales and the Australian Capital Territory (list updated November 2016)

Hydrogeological Landscape (HGL) boundaries and descriptions have been derived for a number of project areas across NSW.

The HGL concept provides a structure for the understanding of how salinity manifests itself in the landscape and how differences in salinity are expressed across the landscape. A HGL spatially defines areas of similar salt stores and pathways for salt mobilisation. The process of HGL determination relies on the integration of a number of factors: geology, soils, slope, regolith depth, and climate; an understanding of the differences in salinity development; and the impacts (land salinity/salt load/water electrical conductivity) in landscapes. Information sources such as soil maps, site characterisation, salinity site mapping, hydrogeological conditions and surface and groundwater data are combined to develop standard descriptions for each HGL unit.

Derivative maps showing overall salinity hazard and individual hazard due to salinity expressed as land salinity, salt export (load) and stream EC are available for most mapped areas, and are also viewable as custom layers in eSPADE.

Overall salinity hazard uses a five class system (very low, low, moderate, high, very high). This helps the user identify and prioritise where salinity management actions may need to be targeted.

Hazard due to salt land, salt export and stream EC uses a three class system (low, moderate, high). Knowing which of these are of greater significance in a HGL unit helps the user decide on the types of management actions that may be applied.

Data and reports are publicly available for the following HGL study areas:

Spatial resolution varies between 1:50 000 and 1:250 000, depending on the resolution of the source data used to define the HGL boundaries.

Data and resources

Additional Information

Field Value
Metadata template type Vector
Asset Type Dataset
Alternative Title HGL Study Areas - NSW & ACT
Metadata Date 09/11/2016
Date of Asset Creation 01/11/2016
Date of Asset Revision 14/11/2016
Purpose This metadata provides a general introduction to HGL mapping areas in NSW and ACT. Data packages containing GIS data and associated HGL descriptions for the individual mapping areas are available for download separately.
Update Frequency Data is updated irregulary
OEH Service Landscapes and Aquatic Ecosystems
Licence Creative Commons Attribution 4.0
Landing Page http://data.environment.nsw.gov.au/dataset/e9d5e1ae-dc4a-4aab-a2d7-763825234e2e
Geospatial Topic Environment,Geoscientific information,Farming,Boundaries
Language English
Geospatial Coverage
Map data © OpenStreetMap contributors
Tiles by MapBox
Temporal Coverage From 01/01/2008
Datum GDA94 Geographic (Lat\Long)
Legal Disclaimer Legal Disclaimer
Attribution Office of Environment and Heritage (OEH) asserts the right to be attributed as author of the original material in the following manner: "© State Government of NSW and Office of Environment and Heritage (OEH) 2016"