Metadata : Groundwater resources of the Gunn Point Area, 2020


Metadata Details:

Name: AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile

Version: 1.0

Date Metadata Extracted: 2021-09-29

Date Metadata Last Updated: 2020-07-17

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Current URL (XML format) :


ANZLIC Identifier: A7A1399D66866558E0530101007FC356

Title: Groundwater resources of the Gunn Point Area, 2020

Citation Date: 2020-06-18

Date Type: publication

Custodian: Department of Environment, Parks and Water Security



A groundwater resource investigation has been undertaken in the Gunn Point region as part of the Mapping the Future project 2018-2022 to inform land use and water resource planning. The project successfully mapped groundwater quality types and the distribution of salinity across the study area.

An analysis was undertaken to produce a map delineating the level of groundwater resource risk associated with development. The study area has been divided into four levels of risk, taking into consideration the factors of electrical conductivity, access to diffuse recharge, impact from salinity and known difficulties in constructing successful bores.

Groundwater Resource Risk Class 1
Access to groundwater risk: Low
Description: Fresh and annual recharge. Fresh water quality (EC < 1000 uS/cm), annual recharge, not impacted by saline groundwater. Shallow depth to productive aquifer.

Groundwater Resource Risk Class 2
Access to groundwater risk: Minor
Description: Fresh but limited annual recharge. Fresh water quality (EC < 1000 uS/cm), minor to no annual recharge, not impacted by saline groundwater. Medium to deep depth to productive aquifer.

Groundwater Resource Risk Class 3
Access to groundwater risk: Moderate
Description: Fresh to brackish and saline impacted. Fresh to brackish groundwater (EC 450 to 2000 uS/cm), impacted by saline groundwater. Mixed depth to aquifer.

Groundwater Resource Risk Class 4
Access to groundwater risk: High
Description: Brackish and saline impacted. Brackish to saline groundwater (EC < 2000 uS/cm), impacted by saline groundwater. Deep depth to productive aquifer.

This record summarised the groundwater resource risk classes as explained above.

The groundwater assessment component of the project achieved three key objectives (captured in the other five datasets for this survey)
1. delineate zones and mechanisms for recharge into the Koolpinyah Dolostone aquifer
2. establish locations and sources of groundwater discharge from the system
3. map the spatial distribution of groundwater salinity and mechanisms for potential intrusion

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Dataset Status

Dataset ID:

Language: English

Character Set: Latin 1

Progress: completed

Maintenance and Update Frequency: notPlanned

Data Currency Start Date:

Data Currency End Date: 2020-07-17

Access Constraint: Download the spatial data package (contains spatial data, maps and reports) via

You are licensed to use the DENR geospatial products on the terms and conditions set out in:
Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at:
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You are free to copy, communicate and adapt the licensed material, provided that you abide by the licence terms (including Attribution) and attribute the licensed material using the statement:
Supplied by the Department of Environment and Natural Resources. Copyright Northern Territory Government.

Data Quality


Positional Accuracy: Positional accuracy of 250 metres from bore locations

Attribute Accuracy:

Logical Consistency: GIS editing tools were used to rectify all overshoots and undershoots in line work. Following polygon data topological rules, checks were performed to detect flaws in the spatial data structure. The coverage was cleaned, to eliminate any duplicates arcs. The coverage was built for arcs and polygon topologies. A label errors routine was run to detect unlabelled polygons. A node errors routine was run to identify pseudo nodes and dangles. Checks were done to unsure that all classified polygons are closed, nodes are formed at intersections of lines and that each polygon has only one label.

Completeness: Complete


Data Requests OfficerDepartment of Environment, Parks and Water SecurityGeospatial Services Branch (on behalf of department)

Data Dictionary

AttributeAttribute DescriptionPossible CodeCode Description
01. CODESurvey code
02. NAMESurvey name
03. GWRISKGroundwater risk class
04. ACC_GWRISKAccess to groundwater risk
05. GW_DESC_1Groundwater description 1
07. GW_DESC_2Groundwater description 2

Supplementary Information

GPGWM_250_BND survey boundary
GPGWM_250_DISCCH productive aquifer recharge areas
GPGWM_250_RCHRG productive aquifer discharge areas
GPGWM_250_DTPA depth below surface to productive aquifer
GPGWM_250_EC groundwater electrical conductivity (uS/cm)
GPGWM_250_WQ groundwater water quality
GPGWM_250_RISK groundwater resource risk classes

This record maintained using the NTLIS Metadata Tool