Depth to Watertable

Dataset Number1076
Dataset TitleDepth to Watertable
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water


DescriptionThis assessment is intended to provide a general indication of the depth to groundwater in landscapes where watertables are sufficiently shallow to affect plant growth. Because the mapping program concentrated on soils and the materials immediately beneath them, the depth to watertable is commonly estimated from local knowledge and/or an understanding of regional stratigraphy by land resource assessment specialists. No distinction is made between salineSELECT 1 FROM DUAL; non saline and perched (watertables occurring on slowly permeable subsoils at shallow depth which are accounted for under Waterlogging Susceptibility) watertables. Eight Watertable Depth analysis data classes (including not applicable) have been supplied as percentage values of Soil Landscape Map Units to be used for the calculation of spatial data statistics. Note: the sum of all percentage values for each map unit totals 100%. Soil Landscape Map Units are categorised INTO eight (plus not applicable) legend categories (WT_DEPTH) according to the part of the landscape with the shallowest depth to watertable, provided that it accounts for at least 30% of the map unit. Also included are legend categories which identify land where limited areas have watertables shallower than 100 cm and 200 cm.
UsageLink to Soil Attribute Descriptions. This dataset has been derived from the Soil Landscape Map Units spatial dataset to be used for map creation or the calculation of spatial data statistics. Used to supply Government, community groups, industry and the general public with up to date regional, subregional and catchment level land and soil attribute information for southern South Australia. The aim is to produce maps, statistics and reports displaying and describing: Land and soil attributes within southern South AustraliaSELECT 1 FROM DUAL; Land surface features affecting land use, land management and productivitySELECT 1 FROM DUAL; Limitations / suitability of land and soil for a range of agricultural and other uses. Independent professional advice should be sought before using this in commercial decisions. Further information: soil and land attributes. Depth to Watertable dataset can be viewed on NatureMaps (>Soils>Soil Moisture Attributes). Spatial data downloads are available from Data SA.

Data Quality

LineageThe dataset is based on an interpretation of 1:40,000 stereo colour aerial photography and limited field inspection of landscapes and soils by soil scientists. Soil Landscape Map Unit boundaries were determined after an integration of field observations and recordingsSELECT 1 FROM DUAL; laboratory analysesSELECT 1 FROM DUAL; stereoscopic examination of aerial photographsSELECT 1 FROM DUAL; understanding of regional landscape processes and stratigraphySELECT 1 FROM DUAL; existing soil and geological mapping data. To avoid inconsistencies and confusion, any updates to the Soil and Land Attribute mapping are to be managed by DEWNR Soil and Land Program. This data has been released under a Creative Commons licence. Where products are derived from this data, DEWNR are to be acknowledged, and any changes to the original data should be indicated.
CompletenessComplete. The spatial data is subject to amendment as and when more data become available.
Positional AccuracyThe accuracy is to the scale of mapping (50 metres at 1:50,000 and 300 metres at 1:100,000 mapping scale). The spatial data is to be used at the regional, subregional and catchment level, and can be used to provide property overviewsSELECT 1 FROM DUAL; however, cannot be used at the paddock level. South East, Kangaroo Island, Mount Lofty Ranges and the 'bottom' of Yorke Peninsula have been mapped at 1:50,000. Eyre Peninsula, the main part of Yorke Peninsula, Murray Mallee and Northern Agricultural Districts have been mapped at 1:100,000. Map unit boundaries should be treated as transition zones.

Geographic Extent

Extent NameAgricultural Region - South Australia
Min Easting or Longitude132.25
Min Northing or Latitude-38
Max Easting or Longitude141
Max Northing or Latitude-32.25

Dataset Status

Initially Acquired01-JAN-2000
Last Updated01-JUL-2009
Update FrequencyAs required
Maintenance MethodAs required
LicenseingCC BY (Attribution)


TableNameField AliasData TypeDescription
Landscape.SALAD_Watertable_DepthLANSLU CharacterSoil Landscape Map Unit.
Landscape.SALAD_Watertable_DepthWT_DEPTH CharacterDepth to watertable (Legend category. See layer file for descriptions).
Landscape.SALAD_Watertable_DepthO1 NumberPercentage of map unit where depth to watertable is more than 200 cm.
Landscape.SALAD_Watertable_DepthO2 NumberPercentage of map unit where depth to watertable is 100 to 200 cm.
Landscape.SALAD_Watertable_DepthO3 NumberPercentage of map unit where depth to watertable is 50 to 100 cm.
Landscape.SALAD_Watertable_DepthO4 NumberPercentage of map unit where depth to watertable is 0 to 50 cm.
Landscape.SALAD_Watertable_DepthO5 NumberPercentage of map unit where depth to watertable is above surface for up to 3 months.
Landscape.SALAD_Watertable_DepthO7 NumberPercentage of map unit where depth to watertable is above surface for 3 to 10 months.
Landscape.SALAD_Watertable_DepthO8 NumberPercentage of map unit where depth to watertable is above surface for more than 10 months.
Landscape.SALAD_Watertable_DepthOX NumberPercentage of map unit which is not applicable.

Contact Information

OrganisationDepartment for Environment and Water
Science Monitoring and Knowledge
Postal AddressGPO Box 1047