For 2015 Surface Water Status Reports, how is the status of streamflow determined?
Where does the rainfall information published in groundwater status reports come from?
Where do the extraction volumes published in groundwater status reports come from?
How is the overall status (traffic light colour) for the prescribed surface water resource assigned?
Why are there two different suites of definitions for the Surface Water Status Reports’ status symbols?
Why have the Prescribed Area assessment reports changed the way they present and analyse data?
How have the Prescribed Area Assessment Reports changed the way they present and analyse data?
For 2015 Groundwater status reports: how is the status of groundwater levels determined?
To determine the status of groundwater levels, beginning with the 2015 reporting period, the trend in groundwater levels over the past five years was analysed (e.g. for 2015 reports, this is the period 2011–15 inclusive). First, each monitoring well was assigned a ‘threshold groundwater level’. This is the lowest groundwater level measured in that monitoring well over its entire data record, or the ‘historical minimum’. Next, the status for each well was determined based on the 2015 minimum water-level measurement and the trend in water level over the past five years, specifically: (1) if the 2015 minimum groundwater level is greater than the historical minimum, the status is assigned according to whether the trend is rising (blue), declining (yellow) or the water level is stable (green); or (2) if the 2015 minimum groundwater level is the lowest on record, the status is assigned according to whether the trend is rising (purple), declining (black), or the water level is stable (grey).
For the purpose of Groundwater status reports, the definition of a ‘stable’ water level is based on tolerances, whereby a well’s groundwater level can show a rising or declining trend, but measure within a certain margin (tolerance) and still be considered stable. These tolerances vary with aquifer type and the scale of the resource. This approach was taken to: (1) accommodate wells that show water levels with such low rates of water level rise or decline that they can be considered stable; and (2) account for very small errors (e.g. human or instrument error) that are common in measurements of any kind, including water levels.
The tolerances that have been chosen to demarcate a stable water level are based on the trend (i.e. rate of change) in water level over the past five years. For sedimentary systems—i.e. for both regional confined systems with large storages; and for moderately sized unconfined and semi-confined to confined aquifers—the tolerance chosen to delineate stable water levels is 0.02 m/y. Fractured rock aquifers have generally lower storages and are assigned a tolerance of ±0.01 m/y. Smaller unconfined lenses in the Eyre Peninsula are assigned a tolerance of ± 0.004 m/y.
For 2015 Groundwater status reports, how is the status of groundwater salinity determined?
How is the overall status for the groundwater resource assigned?
Why are there two different suites of definitions for the Groundwater status reports’ status symbols?
Why are the Prescribed Area Assessment Reports being prepared?
Why hasn't a Prescribed Area Assessment Report been prepared for my water resource?
What data is used to create the Prescribed Area Assessment Reports?
Why has the status of my prescribed water resource changed?
Why are only some of the 2011 Groundwater reports in the Summary Report Card format?
What about all of the technical information the base Prescribed Area Assessment Reports contain?
What are water dependant ecosystems (WDEs)?
Why is the salinity of the groundwater resource only shown as colour coded spots on a map rather than showing regional salinity contours?
What is the Government doing to address over-use of water resources?
Who can I contact if I need further information?
Why were 2012 Groundwater Status Reports not produced for some of the groundwater resources?