Input Dataset

Queensland Groundwater Dependent Ecosystems and Potential GDE Aquifer Mapping

Groundwater Dependent Ecosystems (GDE) is ecological and hydrogeological information on known groundwater dependent ecosystems and ecosystems that potentially use groundwater.

Dataset Purpose

GDE dataset aims to improve Australia's understanding of groundwater dependent ecosystems and facilitate how they are considered in water management. Information in the GDE dataset includes the ecosystems that rely on the surface and subsurface expression

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Dataset Lineage

Linework to delineate the GDE extent was sourced from the following datasets (held by the Queensland Herbarium, Department of Science, Information Technology and Innovation): 1. Queensland Wetland Data Wetlands Mapping (2009 extent, Version 3.0) 2. Vegetation Communities and Regional Ecosystems (REs) of Queensland (2011 extent, version 8.0 for Lake Eyre catchments and 2009 extent, Version 7.0 for all other surveyed catchments). Although the wetlands linework was typically used to represent surface expression GDEs and regional ecosystems linework typically used to represent terrestrial GDEs, this was not always the case. Non-wetland regional ecosystems have been used to delineate areas that may potentially contain surface expression GDEs such as geological contact zones where springs may be not detected as a wetland in current wetlands mapping due to their small size. ATTRIBUTION The attribution for this dataset was sourced from expert knowledge, literature and existing spatial datasets. Information about the location and extent of groundwater was collected at GDE workshops held for the Murray-Darling Basin, Wide Bay- Burnett, Pumicestone Passage, Mackay-Whitsunday, South East Queensland, Lake Eyre Basin, Cooper Basin and Galilee Basin mapping areas. Information collected from regional staff and other experts with local knowledge of groundwater included the location of wetlands, springs and stream baseflow. Known and potential GDEs were identified in the GDE workshops and this is attributed in the data with the level of confidence (i.e. high, moderate or low) in the knowledge about the GDE. An important part of the information collection at the GDE workshops included the capture of pictorial conceptual models which are representations of observed objects, phenomena and processes in a logical and objective way with the aim of constructing a formal system whose theoretical consequences are not contrary to what is observed in the real world. These pictorial conceptual models will be hyperlinked to the GDE spatial data to aid the interpretation of the data. For more information refer to the GDE pictorial conceptual models. Another key part of the information collected was the identification of GDE decision rules that described combinations of conditions where ecosystems are or are likely to be dependent on groundwater at a specific site or local area according to expert knowledge. GDE decision rules may include descriptions of conditions such as geology, vegetation, topographic position, elevation and rainfall zones. These decision rules were subsequently categorised and combined into GDE mapping rule-sets in preparation for their application using geographic information system (GIS) technology. A GDE mapping rule-set is a combination of related decision rules with similar groundwater dependent ecosystem drivers and processes that when applied to spatial data sets through GIS analysis delineate where ecosystems are or are likely to be dependent on groundwater. These GDE mapping rule-sets are used to determine the 'derived' potential GDEs that make up the majority of the GDE mapping.
The surface GDE points data-set is derived from the Queensland Springs Database and is produced on a state-wide basis.
Linework to delineate the shallowest watertable aquifer was sourced from landzone obtained from Regional Ecosystems (REs) of Queensland (2011 extent, version 8.0 for Lake Eyre catchments and 2009 extent, Version 7.0 for South East Queensland catchments) utilizing the same expert knowledge that formulated the GDE mapping rule-sets.

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