Metadata : Bores sites in the Northern Territory.

Index:


Metadata Details:

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

Version: 1.0

Date Metadata Extracted: 2020-11-30

Date Metadata Last Updated: 2020-10-28

Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=2DBCB7711FC106B6E040CD9B0F274EFE

Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=2DBCB7711FC106B6E040CD9B0F274EFE


Citation

ANZLIC Identifier: 2DBCB7711FC106B6E040CD9B0F274EFE

Title: Bores sites in the Northern Territory.

Citation Date: 2000-01-14

Date Type: publication

Custodian: Department of Environment and Natural Resources


Description

Abstract:

Bores - This data represent the location and key attributes of all drill holes within Northern Territory. Drill holes contained within the dataset may be currently active or historic and may have been drilled for a wide variety of purposes such as water extraction, investigation and monitoring.

Bore groundwater level - This data represent water level in the bores, a time series data where the data is measured at frequent continuous intervals.

Bore AHD - Bores height from Shuttle Radar Topography Mission (SRTM) 1 sec DEM-S (V1.0) in AHD. Extracted May 2020. Extraction twice a year.

ANZLIC Search Words:

Spatial Domain:

Bounding Coordinates:


Dataset Status

Dataset ID: ANZNT0001000057

Language: English

Character Set: Latin 1

Progress: onGoing

Maintenance and Update Frequency: continual

Data Currency Start Date: 1985-01-01

Data Currency End Date: 2019-08-09

Access Constraint: Download the spatial data package (contains spatial data, maps and reports) via https://data.nt.gov.au/

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: https://creativecommons.org/licenses/by/4.0/legalcode

If you do not agree to the terms and conditions you must not use the geospatial products.

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

Lineage: Before 1995 - site locations were collected using the property boundary, NT cadastre and/or 1:250,000 topographic maps. Site data is manually recorded using log book or site sheets. Data was manually entered into the water data management database.

From 1995 - site locations were collected using GPS,1:25,000 and 1:50,000 topographic maps. Site data is manually recorded using log book or site sheets and digital logger devices. Depending on the method of capture the information is either manually or electronically down-loaded directly into the water data management database.

Positional Accuracy: Before 1995 - the positional accuracy of sites is deemed low with with a standard deviation of +/- 300 - 10 000 metres. A poor positional accuracy resulted from inconsistencies with the collection/storage of positional data and original mapping formats. Some of locational accuracy of these sites is being upgraded from poor to high wiht the the use of GPS.

From 1995 - the positional accuracy of sites is deemed high with a standard deviation of +/-3 - 10 metres with the use of GPS.

Attribute Accuracy: The accuracy of the sites attribute information is considered high and conforms to the Department standard at time of capture.

Logical Consistency: Not Applicable

Completeness: Continually updated and maintained.


Contacts

NameOrganisationPositionRolePhoneFaxEmail
Data Requests OfficerDepartment of Environment and Natural ResourcesGeospatial Services Branch, Water Resources Divisiondistributordatarequests.denr@nt.gov.au

Data Dictionary

AttributeAttribute DescriptionPossible CodeCode Description
01. BORE_N0Registered Bore Number. For example RN020614
02. BORE_NAMEA specific name given to the bore at the time of drilling.
03. BORE_REPORTThe online link to the scanned Bore Statement report
04. DRY_RISKAlias: Rating for risk of dry bore
Darwin Rural Dry Risk Project.

The risk of the predicted groundwater level at 31 October 2019 being lower than the bore's assessment depth (cut off depth) in the Darwin Rural area.
Information about this project - http://nrmaps.nt.gov.au/knowyourbore.html
At riskWhere the predicted groundwater level is below the 'cut-off' depth. This rating applies only to bores in Berry Springs or Howard groundwater systems.
Not assessed in this projectApplies to class 4 bores inside the Darwin rural area with insufficient data to make a risk determination. OR Bores within the Darwin rural area that were entered in the NT Bores dataset after 8 May 2019. OR Bores located outside of the Darwin rural area which are not included in this assessment.
Not at riskThe predicted groundwater level is above the 'cut-off' depth.
Potentially at riskWhere the predicted groundwater level is below the 'cut-off' depth. This rating applies only to bores outside of Berry Springs and Howard groundwater systems because of low confidence in predicted groundwater levels.
05. RISK_CLASSAlias: Bore risk class
Darwin Rural Dry Risk Project.

A set of criteria was used to assign each bore with a Class where data was available. The outcome of the assessment process helped to defined the Dry Risk Rating.

DD - The drill depth is the total depth to which the bore was drilled.
CD - The construction depth is the depth to which a casing is installed. A casing is the pipe that is installed into the drill hole to hold water.
1Summary: Drill depth, construction depth and the location of the bore screens/slots known. Detail: A bore is assessed as Class 1 if it has at least 1 record in the Hydstra casing table containing a true value in the Open field. The cut off depth is set at 10m above this open screen depth. Where there are multiple screens in one bore, the cut of depth is set to 10m above the from depth of the upper-most screen in the lower aquifer.
2Summary: Construction depth and the drill depth known. Detail: A bore is assessed as Class 2 when there are no open screens recorded but the Completion Depth (CD) field of the NT Bores contains a value >0. The cut off depth is recorded as 10m above the CD depth, where CD>10m. Where CD<10m, cut off depth = CD.
3Summary: No casing data but a drill depth is known. Detail: A bore is assessed as Class 3 when CD=0 but Drill depth (DD) >0. The cut off depth is set to 10m above DD, where DD<60m. Where DD >60m, the cut off depth is set to 10m above 60 ie 50m. This assuming pumps are not set lower than 50m.
4Summary: Construction depth or the total depth is unknown. Detail: A bore is assessed as Class 4 where NT Bores data shows CD = 0 and DD = 0.
06. ASSESS_YEARYear and date of Dry Risk Bore assessment is 8 May 2019.
Darwin Rural Dry Risk Project.
07. GWRESOURCEAlias: Darwin Rural Groundwater Resource
Darwin Rural Dry Risk Project.

This is a combination of Groundwater System, Sub-Catchment and Sub group names.
This refers to the spatial dataset displayed in NR Maps, called Darwin Rural Groundwater Systems. See folder Water Resources, sub-folder Water Management Areas.
08. OWNER_INFOAlias: Bore Owner Action (project information link)
Darwin Rural Dry Risk Project.

Information for Darwin Rural residents is described here;
https://denr.nt.gov.au/land-resource-management/water/water-resources/help-stop-the-drop
09. WATER_DATAAlias: Water data portal
The Water Data portal provides access to data and information collected and generated by the Water Resources Division. Not all bores will be described in the portal.
https://nt.gov.au/environment/water/water-information-systems/water-data-portal
10. STATUSBore status is either Current or Historical.
The data display in NR Maps has been separated into 2 separate layers using this attribute.
CurrentThe Construction Status table was used to select all bores that are actively being used.
HistoricalThe Construction Status table was used to select bores that are no longer used. (the previous version of this dataset described these bores as Not In Use.)
11. STATUSCONSThis is a reference to the Hystra table Construction Status and uses a list of 19 values.
New bores will only be described as Constructed (Capped).
12. PURPOSEThe primary purpose of the bore is described as
- Production
- Monitoring
- Investigation
- Unknown
13. MONITOREDIndicates whether the bore is used for monitoring water level and condition
14. YIELDThis is the flow rate in litres per second (L/s)
15. YIELDCLASSThe Yield Class is used to group the yield L/s values. This attribute is used for data display purposes in NR Maps for the layer Bores - Current.
Yield Unknown
> 0.0 - 1.0 L/s
> 1.0 - 2.0 L/s
> 2.0 - 5.0 L/s
> 5.0 - 10 L/s
> 10 L/s
16. COMPL_DATEThe date the bore construction was completed
17. COMPLDEPTHAlias: Completed Depth (m)
The final depth from ground level of the hole in metres to the bottom of the casing and sump at the completion of construction, including any backfilling.
18. DRILLDEPTHAlias: Drilled Depth (m)
Maximum depth drilled in metres. This may be more than depth on completion if backfilling occurred afterwards.
19. WATERLEVELAlias: Standing water level (m)
The SWL is measured from the ground level after having drilled through the bottom of the water bearing layer or aquifer.
20. TEST_DATEThe date the pump test was performed
21. TEST_TYPEThe type of pump test performed on the bore hole. Possible codes are:01Steps only
02Steps + Constant Rate
03Steps + CR + Recovery
04Constant Rate Only
05Steps + Recovery
06Constant rate + Recovery
07Slug Test (recov only)
ALAirlift
BGBailing
Null (blank)unknown or not recorded
PGPumping
22. GAMMAThis field describes whether a Gamma log was performed on the bore hole. Values are Yes or No.
23. LOCALITYA general description of the bore location.
24. POSACCThe bore location positional accuracy is described using the following values:EstimatedThe location of the bore is estimated.
GPSAccuracy < 30m
On BlockThe bore is located on the correct block or parcel. The location is estimated.
SurveyedAccuracy < 1m
25. LATITUDEPosition of bore in Geographic coordinates in GDA94 south of the equator. (the y coordinate)
Coordinate format is decimal degrees. Example: -13.234567
26. LONGITUDEPosition of bore in Geographic coordinates in GDA94 east of the prime meridian. (the x coordinate)
Coordinate format is decimal degrees. Example: 133.234567
27. GRDATUMThis field describes the grid datum used to define the Easting and Northing or the latitude and longitude
28. UTM_ZONEGrid coordinates (easting and northing) on a cylindrical surface, resulting in in north-south bands of 6 deg longitude known as zones.
The 2 Northern Territory zones, 52 and 53, use the UTM projection (Universal Transverse Mercator) with the MGA (Map Grid of Australia).
52Zone 52 is west of 132 deg longitude (ie. between 126 and 132 degrees longitude)
53Zone 53 is east of 132 deg longitude (ie. between 132 and 138 degrees longitude)
29. EASTINGEasting coordinates according to the the Map Grid of Australia in GDA94. (or the x-coordinate)
30. NORTHINGNorthing coordinates according to the the Map Grid of Australia in GDA94 (or the y-coordinate)

Supplementary Information

The site information can be viewed and analysed using the Hydstra database system, GIS applications and NR Maps.

This information can be viewed in these layers in NR Maps, under folder Water Resources. http://nrmaps.nt.gov.au/nrmaps.html

Group Bores: (Current, Historical, Water Quality, Bores with Dry Risk and groundwater level)


This record maintained using the NTLIS Metadata Tool