There are two main pages to explore data: the Map page and the Data Explorer page.

  • The Map page is useful to explore where loads data are located within Queensland within a map interface. Select your analytes of interest in the panel on the left for the map to update.
  • The Data Explorer page is useful to filter and display data by region, site and year.

Map tab

The Map tab is useful to explore where catchment loads data are located within Queensland within a map interface.

The map displays all loads regions as defined areas on the map. You can zoom into areas of interest and loads sites will appear. Hover over the blue site dot for the site name and ID to appear.

To interact with the map, select:

  • A region (or regions)

  • An analyte

  • A reporting year

from the drop-down menus in the left panel.

The map will only be refreshed when all three of these drop-down menus are selected by the user.

Upon selection of these three inputs, the map will be updated to show loads data for your region/s, analyte and reporting year.

You can interact with the data in the map by clicking on the loads data (represented regionally) to access more information.

You can continue to change any of these inputs, and the map will re-load to show loads data for your inputs. To clear the filters and return to the original overview map, de-select all regions from the ‘Select region/s’ drop-down menu. Natural Resource Management (NRM) regional boundaries are used to select a region of interest. Loads are displayed at a basin scale.

Loads visualised on the map are representative of the upstream catchment area of a given monitoring location. Smaller catchments are layered on top of larger ones, as such if you find a coloured area is showing a pop-up ‘Load Data is not available’ this may indicate a subcatchment of a larger basin was unable to report loads, while the downstream site was able.



Data Explorer tab

The data explorer tab offers several graphs to end users for data analysis.


Loads over time graph

The Loads over time graph displays the relationship between discharge and load over time. The bars show the load value for the selected analyte, and the blue triangle markers represent the discharge value over the available years. A user is able to select two modes for this graph - the ability to see an analyte over multiple years, or the ability to see an analyte over multiple sites. Hovering the mouse over bars on the graph reveals additional data for the user. If the bars are not clearly visible for specific years due to significant differences between values, you can view the bar chart with a log-scaled y-axis, by selecting the ‘Switch to log scale’ button at the bottom of the chart.



Loads and discharge relationship graph

The Loads and discharge relationship graph displays the relationship between discharge and loads over time. This graph requires an analyte and a site to be selected. Users are able to switch off the Linear model fit by clicking on this item in the Legend. This graph will generate using only 2 data points, however the smaller the number of data points available, the less indicative the Linear Model fit will be. Hovering the mouse over points on the graph reveals additional data for the user.



Loads within a basin graph

The Loads within a Basin graph, show the loads information broken down per site, grouped by the Basin they are within. A user is required to select an analyte and a basin for the graph to load. Hovering the mouse over bars on the graph reveals additional data for the user. If the bars are not clearly visible for specific years due to significant differences between values, you can view the bar chart with a log-scaled y-axis, by selecting the ‘Switch to log scale’ button at the bottom of the chart.


Plotly is an interactive graph interface which allows users to engage with the data in several ways. Please refer to the Plotly Help Page for further information.

Users are able to change any of the inputs at any time, and the graph will reload to show the selected analytes.


Loads Data

The sampling quality rating (representivity) is assessed against two criteria; the number of samples collected in the top five per cent of annual monitored discharge, and the ratio between the highest discharge at which a water sample is collected at a site in a year and the maximum discharge recorded in that same year. These two criteria combine to provide a quality rating for the calculated load. Hydrographs are also visually inspected to validate the quality ratings. Loads with ratings of ‘Excellent’, ‘Good’ and ‘Moderate’ are reported publicly alongside their quality rating. Sites with too few concentration or validated flow data, or with a quality rating of ‘Indicative’ are non-reportable and are not made publicly available. Where a load is non-reportable, the associated yield will also be non-reportable.

Data from some South East Queensland monitoring sites are under a data embargo and can not be released to the public prior to Healthy Land and Water reporting. As such, these data may not be available through Tahbil for a period of two years from collection.

Glossary of Acronyms

GL - Gigalitre
kt - Kilotonne
N- Nitrogen
P- Phosphorous
t - Tonne


Additional Resources

The Catchment Water Quality Alliance (Alliance) is a dynamic partnership that brings together the expertise of government and academia to tackle water quality challenges in Queensland. To find out more about our program please have a look at our Hub website.
Please find additional information to understand and access the data at these links. The Method button will take you to the Tahbil - Water Quality Data Portal: Analyses, Quality and Methods for Calculating Pollutant Loads/Yields and the Pesticides Risk Metric document. This document provides information on the annual load calculation methods, as well as other pertinent information explaining the data available within this application. The Get the Data from Tahbil button will direct you to the Tahbil website to download and access the data shown within this application. The Program Design button will take you to the Great Barrier Reef Catchment Loads Monitoring Program Design document. This document provides information on the program that captures the data shown within this application.

Contact

For more information about the Great Barrier Reef Catchment Loads Monitoring Program please contact:

wqi@qld.gov.au