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
|Identification||Feature id||The unique identifying number allocated to the feature.|
|Classification||Feature type||The 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.|
|Location||Locality Name||The name of the Locality in which the feature lies (recorded by Driller at time of construction).|
|Easting, Northing||The X and Y co-ordinates of the feature.|
|Datum||The co-ordinate system used (GDA94).|
|Co-ordinate accuracy||The 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.|
|Construction||Date drilled||The date on which the feature was constructed.|
|Drilling company||The name of the Drilling Company that performed the construction.|
|Depth||The depth of the feature.|
Units are metres, measured from ground level.
|Hydrogeology||Initial Yield||The yield (i.e. flow rate) measured immediately after the feature was constructed. Units are Litres per second.|
|DTWS List||A 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 List||A 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 SWL||The last Standing Water Level measurement made for the feature.|
|Last SWL Date||The 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 TDS||An 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 geology||A geological classification of the main aquifer supplying water to the feature.|
|Status||Last operating status||The last-recorded value for the "operating" status of the feature. This indicates whether the feature is operating, capped, abandoned, etc.|
|Last operating status date||The date on which the Last Operating Status was recorded.|
TABLE 2 Structured Information About Groundwater Features
|Geological / Hydrogeological Information||Geological Log||The log recorded when the bore was drilled, showing depths and the type of material that was drilled through.|
|Depth to Water Struck||Information recorded when the bore was drilled, showing depths and the water inflows that occurred. |
|Standing Water Levels||The history of water depths as measured in the bore over time.|
(A greater depth value means a lower water level.)
|Last Recorded Status||The 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.
|Construction||Bore Diameter||The diameter of the bore as drilled, showing depths and bore diameters.|
|Casing||Details of the casing used for the bore, showing depths, diameters and casing materials.|
|Screen||Details of the screen used to admit groundwater into the casing, showing depths and screen type.|
|Seal||Details of the type of seal used, showing depths and type of material.|
TABLE 3 General Usability Guidelines for Water According to TDS Levels
State Policy on Water Quality Management 1997 (Tasmania).
A more comprehensive guide to using the Portal can be downloaded.
Groundwater Information Access Portal Users Guide
PDF Version of this page
Groundwater Information Access Portal Information Guide (57 KB)