This dataset comprises watertable salinity for Victoria. Salinity concentration has been mapped in mg/L for Total Dissolved Solids (TDS) using the following classes: <600, 601-1200, 1201-3100, 3101-5400, 5401-7100, 7101-10000, >10000. These classes reflect the beneficial use segments prescribed in the State Environment Protection Policy (Waters) (2018).
Search Words:
Inland waters
,
Geoscientific information
Publication Date:
22 November 2019
Dataset Status:
Victoria
Progress:
Completed
Access Constraint:
Creative Commons Attribution 4.0 (CC-BY)
(
License Text
)
Creative Commons Attribution 4.0 International licence, Copyright and Attribution, Terms of Use - http://creativecommons.org/licenses/by/4.0/
Data Existence:
Metadata Name
Descriptions
Resource Name:
WATERTABLE_SALINITY
Title:
Watertable Salinity
Anzlic ID:
ANZVI0803004915
Custodian:
Owner:
Jurisdiction:
Victoria
Abstract:
This dataset comprises watertable salinity for Victoria. Salinity concentration has been mapped in mg/L for Total Dissolved Solids (TDS) using the following classes: <600, 601-1200, 1201-3100, 3101-5400, 5401-7100, 7101-10000, >10000. These classes reflect the beneficial use segments prescribed in the State Environment Protection Policy (Waters) (2018).
Search Words:
Inland waters
,
Geoscientific information
Purpose:
Geographic Extent Polygon:
Geographic Bounding Box:
Beginning to Ending Date:
1980-01-01 - 2012-03-15
Maintainence and Update Frequency:
As needed
Stored Data Format:
Available Format(s) Types:
DIGITAL
Positional Accuracy:
The dataset is as accurate as the data from which it has been derived. These source datasets include:
(1) the SRW watertable salinity layer;
(2) the Victorian Stratigraphic Database;
(3) borehole locations from GMS.
Attribute Accuracy:
Attribute values are as accurate as the attributes of the source data used to derive the final dataset.
Logical Consistency:
Not known
Data Source:
Dataset Source: Data were obtained from the Victorian Stratigraphic Database and included:
(1) salinity readings from register bores (such as stock and domestic, licensed and observation bores);
(2) the date of each salinity reading;
(3) bore locations (coordinates).
In addition, pre-existing watertable salinity data was obtained from a project conducted by Southern Rural Water. This dataset was used for Catchment Management Areas (CMAs) south of the divide.
For the northern portion of the State, bore data were input into the surface modelling utility ANUDEM. To identify the data to be used as input, a point representing the screened interval of the bore was calculated. The established screen location was then compared to the watertable depth compiled as part of the Victorian Watertable Mapping project. Screen locations within 30m of the watertable depth were adopted as watertable bores. Only those bores with salinity readings taken on or after January 1 1980 were used as input.
The next step in the process involved creating a series of draft watertable salinity maps using the bore data and contours and visually assessing areas for review. This assessment also involved evaluating the residual values or difference between the modelled surface and the original bore inputs. All residuals greater than 250 were identified and resolved. The resultant model was then merged with the SRW data.
A final dataset containing Total Dissolved Solids (TDS) concentrations in mg/L was then produced using the following classes: <500, 500-1000, 1000-3500, 3500-7000, 7000-13000,13000-35000, >35000.
Dataset Originality: Derived