Data and information required to assess surface water quality in the Gwydir subregion are primarily held by the NSW Office of Water, part of the NSW Department of Primary Industries, in its continuous monitoring database (NSW Office of Water, 2014). The information that would be required for a surface water quality assessment includes:
- location information for all surface water monitoring points
- information on the time of surface water sample collection and analysis
- laboratory results of surface water quality analysis.
An assessment of surface water quality in the Gwydir subregion would include assessments of temperature, electrical conductivity and turbidity at least, and these would be compared to water quality guidelines provided by the Australia and New Zealand Environmental and Conservation Council and Agriculture and Resource Management Council of Australia and New Zealand (ANZECC and ARMCANZ, 2000). Data available for any other parameters, such as pH, should also be included if available.