| Reliant on surface expression of groundwater (rivers, springs, wetlands) | |
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Data format: File Geodatabase Feature Class File or table name: GDE SURFACE Coordinate system: Geographic Theme keywords: groundwater, hydrogeology, Australia, surface expression, rivers, springs, wetlands |
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Abstract:
The data set expresses the potential for groundwater interaction/use for river/spring/wetland ecosystems across Australia. It shows the ecosystems that rely on groundwater that has been discharged to the surface, such as baseflow or spring flow. The dataset was created by analysing all river/spring/wetland polygons contained in existing maps, and the outcome of the analysis identified which of those polygons were potentially interacting with groundwater. All river/spring/wetland polygons are considered to be accessing a source of water in addition to rainfall, and hence, they are all IDEs. The river/spring/wetland ecosystems were analysed to determine whether the additional water source was likely to be groundwater, water in the unsaturated zone or surface water. Where this additional information enabled a conclusion to be made on the potential of each river/spring/wetland ecosystem to be interacting with groundwater, the ecosystem was included in the GDE layer ('Reliant on surface expression of groundwater') and categorised as having either a high, moderate or low potential for groundwater interaction. |
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Metadata elements shown with blue text are defined in the International Organization for Standardization's (ISO) document 19115 Geographic Information - Metadata. .Elements shown with green text are defined by ESRI and will be documented as extentions to the ISO 19115.
The data set expresses the potential for groundwater interaction/use for river/spring/wetland ecosystems across Australia. It shows the ecosystems that rely on groundwater that has been discharged to the surface, such as baseflow or spring flow. The dataset was created by analysing all river/spring/wetland polygons contained in existing maps, and the outcome of the analysis identified which of those polygons were potentially interacting with groundwater. All river/spring/wetland polygons are considered to be accessing a source of water in addition to rainfall, and hence, they are all IDEs. The river/spring/wetland ecosystems were analysed to determine whether the additional water source was likely to be groundwater, water in the unsaturated zone or surface water. Where this additional information enabled a conclusion to be made on the potential of each river/spring/wetland ecosystem to be interacting with groundwater, the ecosystem was included in the GDE layer ('Reliant on surface expression of groundwater') and categorised as having either a high, moderate or low potential for groundwater interaction.
The purpose of this layer is to show all GDEs that rely on the surface expression of groundwater across Australia. The layer is one of the primary outputs of the National Water Commission's GDE Atlas and is intended to assist in management and allocation of groundwater resources.
The limitation is that the scale and resolution of the mapped information is only as detailed as the input mapping used; ecosystems that are not mapped in existing river/spring/wetland mapping will not appear in the layer; where there is no river/spring/wetland mapping available, there can be no mapping of GDEs that are reliant on surface expression of groundwater; the data is dependent on the time period of the data used and GDEs can only be identified if active in the time period; it does not provide information on the future or the past.
publication date
Contact National Water Commission or the National Water Commission's nominated agency.
95 Northbourne Ave
Polygons are represented as potential for groundwater interaction/use, by the categories high, moderate and low potential. Attributes are assigned based from published literature describing GDEs or previously existing spatial datasets.
Topology checked using ARC/INFO software.
All features have been mapped where data has been made available to the project.
Accuracy dependent on input data.
Blue Mountains City Council, DSEWPac, GA Geodata, NSW Office of Water, NT NRETAS, SA GOV, Qld DERM, SA Dept of Water, Vic Dept of Primary Industries, Vic Dept of Sustainability and Environment, WA Dept of Water, Tas DPIWE, SA Dept of Planning Transport and Infrastructure
Ecosystem mapping was used to provide the linework which delineates river/spring/wetland ecosystems. Remote sensing data was applied to each ecosystem during the analysis. Other previously existing GIS data was also applied to the river/spring/wetland ecosystems. Together the data enable calculation of the potential for groundwater interaction/use.
Internal feature number.
ESRI
Feature geometry.
ESRI
Length of feature in internal units.
ESRI
Area of feature in internal units squared.
ESRI
95 Northbourne Ave