Groundwater Information Access Portal Information Guide

​​The following tables will help you to understand the type of information that the Groundwater Information Access Portal provides.

TABLE 1 Basic Information about Groundwater Features
IdentificationFeature idThe unique identifying number allocated to the feature.
ClassificationFeature typeThe classification of the feature in terms of type. Most features are "bores", but there are small numbers of other types, such as "dug wells", "spear points", etc.
LocationLocality NameThe name of the Locality in which the feature lies (recorded by Driller at time of construction).
Easting, NorthingThe X and Y co-ordinates of the feature.
DatumThe co-ordinate system used (GDA94).
Co-ordinate accuracyThe accuracy of the position of the feature, measured as "maximum error margin in metres". Generally, older features have larger error margins: for example, their positions may have been determined before GPS technology was in use.
ConstructionDate drilledThe date on which the feature was constructed.
Drilling companyThe name of the Drilling Company that performed the construction.
DepthThe depth of the feature.
Units are metres, measured from ground level.
HydrogeologyInitial YieldThe yield (i.e. flow rate) measured immediately after the feature was constructed. Units are Litres per second.
DTWS ListA short-hand summary of the complete sequence of Depth to Water Struck measurements made during construction of a bore. It consists of a series of items, separated by semicolons. Each item relates to one "layer" drilled through, giving depth from and depth to values (in metres), plus the cumulative inflow for the layer (in Litres per second).
SWL ListA list of Standing Water Level measurements, made over the life of the feature. Individual values are separated by semicolons.
All SWL values are in metres below ground level.
Last SWLThe last Standing Water Level measurement made for the feature.
Last SWL DateThe date on which the last Standing Water Level measurement was made.
Total dissolved solids (TDS)A measurement of the salinity of the groundwater, measured immediately after the feature was constructed.
Units are milligrams per Litre.
See table below for a general guideline for water use according to TDS levels.
Final TDSAn averaged value of TDS, calculated using both laboratory-measured TDS and field measurements of Electrical Conductivity (EC), as available.
Units are milligrams per Litre.
Main aquifer geologyA geological classification of the main aquifer supplying water to the feature.
StatusLast operating statusThe last-recorded value for the "operating" status of the feature. This indicates whether the feature is operating, capped, abandoned, etc.
Last operating status dateThe date on which the Last Operating Status was recorded.

TABLE 2 Structured Information About Groundwater Features
Tab Title
Information Displayed
Geological / Hydrogeological InformationGeological LogThe log recorded when the bore was drilled, showing depths and the type of material that was drilled through.
Depth to Water StruckInformation recorded when the bore was drilled, showing depths and the water inflows that occurred.
Standing Water LevelsThe history of water depths as measured in the bore over time.
(A greater depth value means a lower water level.)
Last Recorded StatusThe last recorded status values for the feature. There are three types of status:

Function: functioning status of the feature.
Flow: flowing status of the feature.
Purpose: the purpose for which the water is used.

ConstructionBore DiameterThe diameter of the bore as drilled, showing depths and bore diameters.
CasingDetails of the casing used for the bore, showing depths, diameters and casing materials.
ScreenDetails of the screen used to admit groundwater into the casing, showing depths and screen type.
SealDetails of the type of seal used, showing depths and type of material.

TABLE 3 General Usability Guidelines for Water According to TDS Levels
Drinking WaterYes
Ecosystem ProtectionYesYesYesYes

Source: State Policy on Water Quality Management 1997 (Tasmania).

More Information

A more comprehensive guide to using the Portal can be downloaded.
Groundwater Information Access Portal Users Guide

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Groundwater Information Access Portal Information Guide (57 KB)