Terminology

The listed terminology provides definitions of terms and acronyms used in the National Groundwater Information System and Australian Groundwater Explorer. The terminology is grouped based on the parent table where the term resides in the National Groundwater Information System database.

Agency
Acronym Term
1 WaterNSW
2 Department of Environment, Land, Water and Planning
4 Department of Environment, Water and Natural Resources
5 Department of Natural Resources, Mines and Energy
6 Department of Water and Environmental Regulation
7 Water Corporation
8 Department of Primary Industries, Parks, Water and Environment
9 Department of Environment and Natural Resources
10 Environment, Planning and Sustainable Development Directorate
11 Geoscience Australia
24 National Collaborative Research Infrastructure Strategy
25 Department of Primary Industries and Regional Development
26 Power and Water
Bore
Term Definition
HydroID Unique feature identifier within the NGIS geodatabase
HydroCode Jurisdictional bore and pipe/outlet identifier (if relevant)
StateBoreID Jurisdictional bore identifier
StatePipeID Jurisdictional hole, pipe or outlet identifier (if relevant)
StateTerritory Abbreviated name for state or territory within which the bore is located
Agency Name of agency responsible for managing the bore
WCode 6-character code used to identify organisations listed in the Water Regulations 2008, which supply groundwater data relevant to the bore to the Bureau
BoreDepth Maximum completed depth of bore
DrilledDepth Maximum drilled depth of bore
Status Status of bore
DrilledDate Date record of bore construction
HGUID Hydro ID of hydrogeologic unit screened by or contributing water to bore
HGUNumber Jurisdictional number for the hydrogeologic unit screened by or contributing water to bore
NafHGUNumber National Aquifer Framework (NAF) number for the hydrogeologic unit screened by or contributing water to bore
FType Feature Type – distinguishes between types of bore features based on their purpose
Latitude Latitude of bore (Geographics GDA94)
Longitude Longitude of bore (Geographics GDA94)
Easting Easting of bore
Northing Northing of bore
Projection Projection for northing and easting co-ordinates
ProjectionZone Zone for MGA GDA94
CoordMethod Method used to determine the co-ordinates of a site.
HeightDatum Height datum for elevation attributes
RefElev Reference elevation used to calculate the elevation of features in the NGIS core, such as lithologic units, hydrogeologic units and construction elements
RefElevDesc Description of the measuring point for the reference elevation
RefElevMethod Method used to determine the reference elevation of a site.
TsRefElev Reference elevation used to calculate time series elevation measurements, such as reduced groundwater levels
TsRefElevDesc Description of the measuring point for the time series reference elevation
TsRefElevMethod Method used to determine the time series reference elevation of a site.
LandElev Land surface elevation
LandElevMethod Method used to determine the land elevation of a site.
IsMultiPipe Flag that indicates whether a bore feature is part of a multi-pipe bore
Construction log
Term Definition
BoreID Numeric identifier that corresponds to the HydroID of NGIS_Bore feature
HydroCode Jurisdictional bore and pipe/outlet identifier (if relevant)
RefElev Reference elevation used to calculate the elevation of features in the NGIS core, such as lithologic units, hydrogeologic units and construction elements
RefElevDesc Description of the measuring point for the reference elevation
FromDepth Depth to top of hydrogeologic unit below reference elevation
ToDepth Depth to base of hydrogeologic unit below reference elevation
TopElev Elevation for top of hydrogeologic unit
BottomElev Elevation for bottom of hydrogeologic unit
ConstructionType Bore component
Material Material of bore component
InnerDiameter Inner diameter
OuterDiameter Outer diameter (or diameter if inner diameter not applicable or available)
Property Property of bore component which PropertySize field is describing
PropertySize Size of bore component described in Property field
DrillMethod Method of construction
LogType Type of the borehole log (construction, lithology or hydrostratigraphy)
Construction material
Acronym Term Definition
ABS Acroylonite Butadiene Styrene Polymer that has the hardiness and strength of a vinyl resin and toughness and impact resistance of the butadiene-acrylonitrile rubber component
AC Asbestos cement Mixture of asbestos fibre, cement and water and highly resistant to corrosion
AGGR Aggregate Mass of rock particles and or mineral grains.
AL Aluminium A light metal with high electrical conductivity and good corrosion resistance
BENT Bentonite Montmorillonite rich clay with the capability to swell in water and be activated in acid
BRK Brick A building material made of clay molded as a rectangular block and kiln fired
BRNZ Bronze A copper-tin alloy
BRNZS Silicone bronze A copper alloy with 1-5% silicon that is corrosion-resistant and has good mechanical properties
BRS Brass A copper-tin alloy
CLY Clay Geological material consisting of particles having diameters less than 2-4 micrometres.
CMT Cement Finely ground powder which when mixed with water makes a plastic mass that will harden.
CN Concrete Mixture of cement, an aggregate and water which hardens to a rocklike consistency.
FBRG Fibreglass Material consisting of glass fibres or flakes reinforcing a matrix typically of polyester and epoxy resins
FRP Fibreglass reinforced plastic Plastic with glass fibre or flakes embedded for added strength
GALV Galvanised iron Iron with a coating of zinc to provide protection from corrosion
GVL Gravel Rock fragments typically rounded and dominated by particles larger than sand (>2mm).
MTL Metal An elemental substance usually with good strength, reflectivity and electrical and thermal conductivity properties.
NONE None No material present
PE Polyethylene Thermoplastic material consisting of polymers of ethylene
PLST Plastic A polymeric material of large molecular weight which can be shaped by flow.
ROCK Rock Undifferentiated mineral matter.
SND Sand Rock or mineral particles having a diameter range of 1/16 to 2mm.
SPL Spoil or cuttings Geological material excavated from feature.
SSTL Stainless steel Corrosion resistant iron-chromium alloy.
STKM Mild steel Carbon steel containing 0.05-0.25% carbon
STL Steel An iron base alloy with up to 2% carbon and malleable under proper conditions
STLC Carbon steel Steel containing up to 2% carbon
STLG Galvanised steel Steel with a coating of zinc to provide protection from corrosion
UNK Unknown Material is unknown.
UPVC Unplasticised polyvinylchloride Thermoplastic polymer of vinyl chloride that is cheap, lightweight and chemically inert and typically used in molded rigid products.
UPVC12 Unplasticised polyvinylchloride Class 12 uPVC with a moderate Class 12 pressure rating which is the recommended minimum casing standard
UPVC15 Unplasticised polyvinylchloride Class 15 uPVC with a high Class 15 pressure rating.
UPVC18 Unplasticised polyvinylchloride Class 18 uPVC with a high Class 18 pressure rating.
UPVC6 Unplasticised polyvinylchloride Class 6 uPVC with a low Class 6 pressure rating that is typically used in drainage or sewage applications.
UPVC9 Unplasticised polyvinylchloride Class 9 uPVC with a Class 9 pressure rating which is the minimum class allowable for shallow bore casing.
WOOD Timber lining for wells Hard fibrous substance making up the trunks and large branches of trees
Construction type
Acronym Term Definition
AFIL Annulus fill Fill within the annulus between the lining and the surrounding geological material e.g. gravels pack, seal and grout.
INLT Inlet Part of groundwater feature that allows intake of groundwater e.g. screen and slotted casing.
LIN Lining Material inserted to line the inside of the void e.g. casing and pipe.
PROT Protection Fittings used to protect the groundwater feature from damage.
UNK Unknown The construction component is unknown
VFIL Void fill Material reinserted inside the void or existing lining e.g. backfill and packer.
VOID Void Hole excavated to intercept groundwater.
Coordinates and elevation
Term Definition
CoordMethod Method used to determine the co-ordinates of a site.
ElevMethod Method used to determine the elevation
Easting Easting of bore
ElevMethod Method used to determine the elevation
Latitude Latitude of bore (Geographics GDA94)
LandElev Land surface elevation
LandElevMethod Method used to determine the land elevation of a site.
Longitude Longitude of bore (Geographics GDA94)
Northing Northing of bore
Projection Projection for northing and easting co-ordinates
ProjectionZone Zone for MGA GDA94
RefElev Reference elevation used to calculate the elevation of features in the NGIS core, such as lithologic units, hydrogeologic units and construction elements
RefElevMethod Method used to determine the reference elevation of a site.
TsRefElev Reference elevation used to calculate time series elevation measurements, such as reduced groundwater levels
TsRefElevDesc Description of the measuring point for the time series reference elevation
TsRefElevMethod Method used to determine the time series reference elevation of a site.
Coordinates and elevation method
Acronym Term Definition
AIR Air photo Estimated from an air photo / aerial photography.
ARB Arbitrary An arbitrary position assigned to a feature with unknown site.
AST Astronomical Measured from astronomical observations.
BAR Barometer. Measured using aneroid barometer.
CAD Cadastre Estimated by address matching or assigning to cadastre (property information).
CBF Block Face Placed on calculated midpoint of street segment of block.
CNI Nearest intersection Placed on calculated midpoint of street segment of block.
CPC Property centre Placed in centre of property.
CTN Town Placed on centre of associated built up area.
DEM Digital Elevation Model Estimated from digital elevation model (DEM).
EST Estimate Estimated using an unknown method i.e. not surveyed.
FLD Field Estimated from field observation.
GAT Autonomous GPS Autonomous global positioning system.
GDF Differential GPS Measured using differential global positioning system.
GKN Kinematic GPS Measured using GPS device with phase kinematic relative positioning.
GPS Global positioning system Measured using global positioning system.
LID Lidar Estimated from LiDAR (Light Detection and Ranging) technology.
GST Static GPS Measured using GPS device with phase static relative positioning.
MAP Map Estimated from map e.g. using contours.
OWN Owner Estimated from owner returns.
RAD Radio triangulation Measured by triangulation using synchronised pulsed transmissions from radio stations
RPT Report Estimate derived from a report eg drillers location map.
SAT Satellite Estimated from satellite imagery.
SBM Benchmark survey Precise survey from a benchmark.
SCP Control point survey Survey between non benchmark control points.
STP Stereophotogrammetry Measured from stereopairs of photogrammes.
STR Trignometric Trigonometrical levelling.
SVY Survey Traditional survey with ground control.
UNK Unknown Method of location or elevation is unknown.
VBL Verbal Estimated from verbal reports.
Drilling method
Acronym Term Definition
AUG Auger Drilling where cuttings are mechanically removed from hole without the use of fluids.
BHO Back hoe Hole dug by an excavator with a bucket attached to a hinged arm that is drawn towards the machine.
BKT Bucket Auger Drilled using a large diameter cylindrical bucket with auger-type cutting blades on base
CBT Cable Tool Uses a heavy drilling tool that is raised and lowered with enough force to pulverise the rock, with the debris removed by bailer.
CORE Core Drilling with an annular-shaped bit to penetrate and produce cylindrical rock cores.
DMDC Diamond Core Core drilling with a hollow diamond-set bit designed to yield continuous cylindrical rock cores.
DOZ Dozer Hole dug by a wheeled or crawler tractor equipped with a reinforced curved steel plate.
DRGL Drag Line Hole dug by an excavator operated by pulling a bucket on ropes towards a jib.
DRL Drill Circular hole created or enlarged using a rotating end cutting tool
DRV Driven Constructed by driving a length of casing usually of small diameter and equipped with a hardened point to the desired depth.
HMR Rotary hammer Using a cutting tool powered by compressed air that creates a rapid percussion effect coupled with rotary action to drill hard rocks.
JET Hydraulic jet Uses a high velocity fluid stream pumped through a pipe with a restricted opening or nozzle to dislodge rock material.
MANA Manual auger Drilling with an auger that is hand powered
MANX Manually excavated Hole manually dug with tools that require human power eg pick, shovel.
RC Reverse circulation Using a technique similar to rotary drilling except that drilling fluid flow down the annular space between the drilling stem and the wall of the hole forcing cuttings up through the drill stem.
ROT Rotary Using a drill stem equipped with a bit that is rotated to cut and grind the rock with a fluid pumped down the stem to force cuttings up through the annular space between the stem and the wall of the hole
SNC Sonic Uses a drilling device that is made to vibrate at sonic frequency.
UNK Unknown Unknown drilling method.
Groundwater management area
Field Definition
Name Jurisdictional name for groundwater management area
Type Jurisdictional classification of management area e.g. Groundwater Management Area, Water Allocation Planning Area
State Abbreviated name for state or territory within which the management area is located e.g. VIC, QLD, SA
Management Plan Name of the plan relevant to the management area
Plan Status Declaration status of the plan e.g. Declared, Proposed
From Depth Depth below surface to bottom of management area (if applicable)
To Depth Depth below surface to top of management area (if applicable)
Reference Hyperlink to the jurisdictional website for access to the management plan or additional groundwater planning information
Groundwater management area type
Acronym Term Definition
1 Groundwater Area WA – Groundwater Areas are proclaimed areas. Proclamation is a legal process that makes managing water resources the Department of Water's responsibility. In proclaimed areas it is illegal to take water from a watercourse or groundwater aquifer without a licence or a conferred right (e.g. exemption, riparian right).
2 Groundwater Management Area VIC – A Groundwater Management Area (GMA) is an area where groundwater has been intensively developed or has the potential to be. GMAs have boundaries defined for the purposes of setting a Permissible Consumptive Volume (PCV) for ongoing management.
3 Subartesian Area QLD – Groundwater areas have been established to protect underground water resources. Subartesian Areas are declared under Schedule 11 of the Water Regulation.
4 Water Allocation Plan WA – Water Allocation Plans outline how much water can be taken from groundwater and surface water resources, while safeguarding the sustainability of the resource and protecting the water-dependent environment.
5 Water Allocation Planning Area NT – Water Allocation Plans can be declared for one or multiple water sources, surface or groundwater. Water Allocation Plans detail the area and water resource, to which the plan applies, as well as the vision, objectives, strategies and performance indicators of the plan.
SA – A Water Allocation Plan is a legal document that sets out the rules for managing the take and use of prescribed water resources to ensure resource sustainability. It is developed with the community, industry and key stakeholders for each water resource identified as being significant, or 'prescribed'.
6 Water Control District NT – Water Control Districts are areas where there is a need for improved management of water resources. Water Allocation Plans are declared within Water Control Districts.
7 Water Management Plan TAS – The purpose of a Water Management Plan is to provide a clear framework for sustainable and transparent allocation, use and management of the freshwater resource within the plan area.
8 Water Resource Plan QLD – Water Resource Plans provide the management framework for water resources, outlining outcomes, objectives and strategies for achieving a sustainable balance between water for industry, irrigators, town water supply and the environment.
9 Water Resource Strategy NT – Similar to a Water Allocation Plan.
10 Water Sharing Plan NSW – Water Sharing Plans establish rules for sharing water between different types of water use such as town supply, rural domestic supply, stock watering, industry and irrigation and ensure that water is provided for the health of the system.
11 Water Sharing Rules QLD – Water Sharing Rules describe the arrangements under which access to water (in a groundwater management area or sub area) are managed.
12 Water Supply Protection Area VIC – A Water Supply Protection Area is an area declared under the Water Act 1989 to protect the groundwater or surface water resources through the development of a statutory management plan, which is more detailed than a plan for a Groundwater Management Area.
Height datum
Acronym Term Definition
AHD Australian height datum The Australian Height Datum is a geodetic datum for altitude measurement in Australia.
ASL Above sea level Above sea level is the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level datum.
ASS Assumed datum The datum point is assumed rather than actual.
MSL Mean sea level The sea level halfway between the mean levels of high and low water.
STD State datum The datum adopted by the individual State or Territory.
UNK Unknown Unknown height datum.
Hydrostratigraphy log
Term Definition
BoreID Numeric identifier that corresponds to the HydroID of NGIS_Bore feature
HydroCode Jurisdictional bore and pipe/outlet identifier (if relevant)
RefElev Reference elevation used to calculate the elevation of features in the NGIS core, such as lithologic units, hydrogeologic units and construction elements
RefElevDesc Description of the measuring point for the reference elevation
FromDepth Depth to top of hydrogeologic unit below reference elevation
ToDepth Depth to base of hydrogeologic unit below reference elevation
TopElev Elevation for top of hydrogeologic unit
BottomElev Elevation for bottom of hydrogeologic unit
HGUID Hydro ID of hydrogeologic unit screened by or contributing water to bore
HGUNumber Jurisdictional number for the hydrogeologic unit screened by or contributing water to bore
NafHGUNumber National Aquifer Framework (NAF) number for the hydrogeologic unit screened by or contributing water to bore
Description Additional description of hydrogeologic unit, such as lithology from a drilling log
Author Person responsible for stratigraphic interpretation
Source Source of information
Comment Additional comments relating to stratigraphic interpretation
Scenario Number used to distinguish between different stratigraphic interpretations
LogType Type of the borehole log (construction, lithology or hydrostratigraphy)
Lithology log
Term Definition
BoreID Numeric identifier that corresponds to the HydroID of NGIS_Bore feature
HydroCode Jurisdictional bore and pipe/outlet identifier (if relevant)
RefElev Reference elevation used to calculate the elevation of features in the NGIS core, such as lithologic units, hydrogeologic units and construction elements
RefElevDesc Description of the measuring point for the reference elevation
FromDepth Depth to top of hydrogeologic unit below reference elevation
ToDepth Depth to base of hydrogeologic unit below reference elevation
TopElev Elevation for top of hydrogeologic unit
MajorLithCode Codes used to describe the major lithology
MinorLithCode Codes used to describe the minor lithology
Description Additional description of hydrogeologic unit, such as lithology from a drilling log
Source Source of information
LogType Type of the borehole log (construction, lithology or hydrostratigraphy)
Property
Acronym Term Definition
GSMAX Maximum grainsize Maximum grainsize of fill (in mm).
GSMIN Minimum grainsize Minimum grainsize of fill (in mm).
GSMOD Modal grainsize Modal grainsize of fill (in mm).
PS Perforation size    Size of perforations (in mm).
SAP Screen aperture Width of screen opening (in mm).
SLAP Slot aperture Width of individual slots (in mm).
SLL Slot length Length of individual slots (in mm).
UNK Unknown Construction element is unknown.
Purpose
Acronym Term Definition
AQCT Aquaculture Water supply for aqua cultural enterprise
ASR Aquifer storage and recovery Aquifer storage and recovery (ASR) facility.
BVGE Beverages Water supply for commercial beverages eg mineral water.
CATL Cattle Water supply for cattle.
COMS Commercial Water supply for commercial activities ie a service business that does not fabricate a product.
CULT Natural heritage/cultural Feature of natural or cultural significance.
DMGN Domestic garden Water supply for domestic garden.
DOM Domestic household Domestic scale water supply for household needs eg. washing, toilet
DOMD Domestic drinking Domestic scale potable water supply.
DRNG Drainage of groundwater Drainage of groundwater principally to lower watertable or remove deleterious groundwater.
DRNK Potable water supply Potable water supply i.e. drinking water
DROT Drought relief Emergency supply for drought relief
DWAT Dewatering Dewatering of an area or structure
DYCL Dairy Cattle Water Supply for dairy cattle.
EXPR Exploration or research Bore installed for the purpose of exploration or research.
GTHM Geothermal Electricity generated from geothermal source.
GWMD Groundwater modelling Collection of hydrogeological information at nodal  point of groundwater model
HELP Emergency supply Used as a water source when principle supply is unavailable.
HUSE Household Water supply for household needs eg. washing, toilet.
INDS Manufacturing and industry Water supply for manufacturing and industry.
INST Institutional supply Water supply for institution.
IPST Irrigated pasture Water supply for irrigated pasture.
IRAG Irrigated agriculture Water supply for irrigated agriculture.
IRRD Irrigation drainage Disposal of irrigation drainage.
LQDW Liquid waste Disposal of liquid waste.
MIND Mine drainage Disposal of mine drainage.
MINE Mining Mining i.e. extraction of minerals or energy resources.
MNAS Mining activities Water supply for mining activities.
MON Monitoring Monitoring of groundwater conditions.
PUBS Public facilities Water supply for public facilities.
RECN Recreation Water supply for recreational purposes.
RECS Recreation and cultural activities Water supply for recreation and cultural activities.
REMD Remediation Remediation of groundwater contamination.
RESV Reservoir Water reservoir eg dam.
RODS Road Supply Water supply for road
RPRS Repressurise Input of water in order to increase or maintain aquifer pressures
SLTI Salinity Interception Interception of saline groundwater.
STOK Water supply for livestock Water supply for livestock.
STRM Storm water Disposal of storm water.
TOWN Town household Town scale water supply for household needs eg. washing, toilet
TRAN Transport Transportation feature
TRCS Transport/communications supply Water supply for transport or communications facility.
TWND Town drinking Town scale potable water supply.
UBND Urban drinking Urban scale potable water supply.
UNK Unknown The purpose of the groundwater feature is unknown.
URBN Urban household Urban scale water supply for household needs eg. washing, toilet.
UTIL Utilities Water supply for utilities - fluid storage or power generation
VLGD Village drinking Village scale potable water supply.
VLGE Village household Village scale water supply for household needs eg. washing, toilet.
WAST Waste disposal Disposal of waste materials.
WSUP Water supply Community water supply.
Reference elevation description
Acronym Term Definition
AIR Airline Datum is base of airline.
BDG Bridge Datum is top of bridge over groundwater feature eg lake, river.
CAB Cable Datum is top of cable access on the cable tool rig.
CEL Element Datum is construction element of groundwater feature.
COL Collar Datum is top of hole collar during construction.
CON Construction Datum is part of construction phase of groundwater feature.
COV Cover Datum is top of protective cover over groundwater feature.
FLR Floor Datum is top of floor of groundwater feature eg floor of dug well.
GBD Gauge board Datum is top of gauge board.
KLB Kelly bushing Datum is top of bushing or insert on rotary table found on rotary drill rigs through which the kelly passes.
NAT Natural feature Datum is a natural feature of landscape around site.
NGS Natural ground surface Datum is ground surface at site of groundwater feature.
PBP Base plate Datum is top of base plate for pump.
SBM Benchmark Datum is top of a permanently established survey point.
SMK Survey marker Datum is top of an arbitrary and temporary marker.
SVY Survey Datum is part of survey.
TOC Top of Casing Datum is top of casing/ standpipe.
UNK Unknown. Feature that datum relates to is unknown.
WEL Well Datum is the top of well frame or lining.
WIN Windmill clamp Datum is top of windmill clamp.
Status
Acronym Term Definition
ABN Abandoned Groundwater feature has been abandoned but the functionality is unknown.
BRK Backfilled Groundwater feature has been backfilled.
CAP Capped Groundwater feature has been capped
CNF Controlled flow Groundwater flow is controlled eg by valves on headworks.
COM Combination Some components of the groundwater feature are flowing while others are non-flowing.
CSF Ceased flow Groundwater feature was originally flowing but has since ceased.
DCM Decommissioned Groundwater feature has been permanently discontinued eg plugged.
DRY Dry No groundwater evident.
FLO Flowing Head is above ground surface so is flowing artesian.
FUN Functional Groundwater feature is in working order.
IRF Irregular flow Groundwater flow occurs in sporadic intervals.
NOF Non-flowing Head is below the ground surface so is not flowing.
NON Non-functional Groundwater feature is not in working order eg collapsed, blocked, damaged, destroyed.
PDF Periodic flow Groundwater flow occurs at more or less regular intervals eg geyser.
PRF Perennial flow Groundwater feature has continuous groundwater flow.
PRP Proposed Construction has not occurred of the groundwater feature.
RCF Recharge response Groundwater feature flows only after periods of recharge eg rainfall.
REC Reconditioned Groundwater feature has been reconditioned so that functionality has improved.
RMV Removed Groundwater feature has been physically removed.
RPL Replaced Groundwater feature is not functional and has been replaced by a newer version.
SEP Seep Small intake of groundwater into groundwater feature.
SNF Seasonal flow Groundwater flow varies seasonally.
UCF Uncontrolled flow Groundwater flow is uncontrolled.
UNK Unknown Status of groundwater feature is unknown.
USE Functioning Groundwater feature is functional and in use.
Variable
Acronym Term Definition

BOT

Bottom elevation

Elevation of the bottom of a hydrogeologic unit relative to the Australian Height Datum (AHD) in metres.

BOT_D

Depth to bottom

Depth from the natural ground surface to the bottom of a hydrogeologic unit in metres.

DTW

Depth to water

Measurement from the natural ground surface to the groundwater level in metres. Positive values are below the ground surface. Negative values are above the ground surface and indicate artesian conditions. This term is sometimes called depth below natural surface (DBNS).

RSWL

Reduced standing water level

The groundwater level elevation relative to the Australian Height Datum (AHD) in metres. This is the standard height datum used in Australia. It sets mean sea level as zero elevation. Positive values are above mean sea level and negative values are below.

SWL

Standing water level

Measurement from the reference point on the bore (e.g. the top of casing) to the groundwater level in metres. Positive values are below the reference point and negative values are above the reference point.

TOP

Top elevation

Elevation of the top of a hydrogeologic unit relative to the Australian Height Datum (AHD) in metres.

TOP_D

Depth to top

Depth from the natural ground surface to the top of a hydrogeologic unit in metres.

UNK

Unknown

Unknown variable.

Variable units
Acronym Term Definition
mAHD Meters relative to the Australian Height Datum The abbreviation for elevation in metres with respect to the Australian Height Datum.
Meters Meters The abbreviation for the unit of measure with respect to metre(s)
mg/L Milligrams per litre The abbreviation for the unit of measure with respect to milligrams per litre.
mS/cm Millisiemens per centimetre The abbreviation for the unit of measure with respect to millisiemens per centimetre.
UNK Unknown Unit of measure is unknown.
uS/cm Microsiemens per centimetre The abbreviation for the unit of measure with respect to microsiemens per centimetre.

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