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HEVAE Vegetation Groundwater Dependent Ecosystems Value - Sydney Metropolitan

Created 24/06/2025

Updated 18/10/2025

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NSW DoI Water has adopted the Guidelines for Identifying High Ecological Value Aquatic Ecosystems (HEVAE) framework developed by the Australian Commonwealth Government. In the current assessment for NSW, the HEVAE consists of four key criteria which include diversity, distinctiveness, naturalness and vital habitat. Therefore, the HEVAE vegetation GDE value layer is a combination of four individual criterion layers. The final or overall HEVAE score was determined for vegetation PCT polygons which has a high probability of being groundwater dependent. This was calculated by adding together the final scores for each criterion (Naturalness, Diversity, Distinctiveness and Vital Habitat). This score was then standardised by dividing by the maximum combined HEVAE score for a whole catchment’s vegetation GDE polygons to provide an even spread of score outcomes between 0 (lowest) and 1 (highest). For ease of data modelling and management, the dataset was divided into the following catchment management areas; Border Rivers-Gwydir, Central Tablelands, Central West, Hawkesbury-Nepean, Hunter-Central Rivers, Lachlan, Lower Murray Darling, Murray, Murrumbidgee, Namoi, Northern Rivers, Southern Rivers, Southern Tablelands, Sydney Metro and Western Division (subdivided further into the IBRA Sub regions).

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Additional Info

Field Value
Title HEVAE Vegetation Groundwater Dependent Ecosystems Value - Sydney Metropolitan
Language English
Licence Creative Commons Attribution 3.0 Australia
Landing Page https://data.gov.au/data/dataset/09c6d103-fb29-471d-bbb1-7c8050fca4ef
Remote Last Updated 08/10/2025
Contact Point
NSW Department of Climate Change, Energy, the Environment and Water
?datansw@customerservice.nsw.gov.au
Reference Period 06/01/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        149.72747,
        -33.55658
      ],
      [
        149.72747,
        -31.33775
      ],
      [
        152.75435,
        -31.33775
      ],
      [
        152.75435,
        -33.55658
      ],
      [
        149.72747,
        -33.55658
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal DataNSW

Data Source

This dataset was originally found on DataNSW "HEVAE Vegetation Groundwater Dependent Ecosystems Value - Sydney Metropolitan". Please visit the source to access the original metadata of the dataset:
https://data.nsw.gov.au/data/dataset/nsw-hevae-vegetation-groundwater-dependent-ecosystems-sydney-metro