The approach for assessing potential to and is discussed in companion submethodology M10 (as listed in Table 1) for analysing and (). The focuses the attention of the analysis on areas where there may be changes in and/or that are attributable to .
The principal focus of is water-dependent assets that are nominated by the community. These may have a variety of values, including ecological, sociocultural and economic values. The (companion product 1.3 for the () and Bioregional Assessment Programme, ) provides a simple and authoritative listing of the assets within the . The register is a compilation of assets identified in natural resource management databases and Commonwealth and state databases, and through the Maranoa-Balonne-Condamine assets workshop. The identified assets were assessed by the Assessment team for fitness for BA purpose, location within the assessment extent and water dependency. Assets that satisfy the requirements were considered in the impact and risk analysis reported in this product.
Landscape classification discretised the heterogeneous landscape into a manageable number of landscape classes for the impact and risk analysis. Landscape classes represent key surface that have broadly similar physical, biological and hydrological characteristics. They are used to reduce the complexity inherent in assessing impacts on a large number of water-dependent assets by focusing on the hydrological drivers and interactions relevant to a regional-scale assessment. The landscape classes provide a meaningful scale for understanding potential ecosystem impacts and communicating them through their more aggregated system-level view. The landscape classification for the Maranoa-Balonne-Condamine subregion is described in companion product 2.3 () and the methodology that underpins it is described in companion submethodology M05 (as listed in Table 1) for developing a of ().
Potential hydrological changes were assessed by overlaying the extent of a landscape class or asset on the zone of potential hydrological change due to additional coal resource development. For the landscape classes or assets that lie outside the , hydrological changes (and hence impacts) are , and were thus ruled out in terms of further assessment. Section 3.4.2 identifies landscape classes in the Maranoa-Balonne-Condamine subregion that were ruled out on this basis.
Where an asset or landscape class wholly or partially intersects the zone of potential hydrological change, there is the potential for impact. This does not mean there will be an impact, but rather, based on the magnitude of the hydrological change, the possibility of an impact cannot be ruled out and further investigation is required. The nature of the water dependency of the landscape class can be important for informing the Assessment. For example, if the water dependence of a landscape class is unrelated to groundwater access, such as woodland vegetation that do not access groundwater, then it is possible to rule out the landscape class from further consideration because it is unlikely to be impacted.
The zone of potential hydrological change defined for the regional was used to assess potential impacts to key surface ecosystems (landscape classes (except ), economic assets (except groundwater ), ecological and sociocultural assets). To assess potential impacts to springs and groundwater bores that access deeper geological layers, the zone of potential hydrological change was defined for the deeper geological layers.
In addition, impact profiles for landscape classes and assets are available at www.bioregionalassessments.gov.au. Each profile summarises the hydrological changes and potential impacts that pertain to that landscape class or asset (e.g. groundwater in the ‘Floodplain remnant vegetation’ landscape class in the zone of potential hydrological change). Users can aggregate and consider potential impacts for their own scale of interest.
Users can also explore the results for landscape classes and assets using a map-based interface at www.bioregionalassessments.gov.au/explorer/MBC/landscapes and www.bioregionalassessments.gov.au/explorer/MBC/assets.
Product Finalisation date
- 3.1 Overview
- 3.1.1 Maranoa-Balonne-Condamine subregion
- 3.1.2 Scope and context
- 3.1.3 Structure of this product
- 3.2 Methods
- 3.2.1 Impact and risk analysis
- 3.2.2 Causal pathways
- 3.2.3 Hydrological analysis
- 3.2.4 Assessing potential impacts for landscape classes and assets
- 3.3 Potential hydrological changes
- 3.3.1 Defining the zone of potential hydrological change
- 3.3.2 Potential groundwater changes
- 3.3.3 Potential surface water changes
- 3.3.4 Potential water quality changes
- 3.4 Impacts on and risks to landscape classes
- 3.4.1 Overview
- 3.4.2 Landscape classes that are unlikely to be impacted
- 3.4.3 'Floodplain or lowland riverine (including non-GAB GDEs)' landscape group
- 3.4.4 'GAB GDEs (riverine, springs, floodplain or non-floodplain)' landscape group
- 3.4.5 'Non-floodplain or upland riverine (including non-GAB GDEs)' landscape group
- 3.4.6 'Human-modified' landscape group
- 3.5 Impacts on and risks to water-dependent assets
- 3.6 Commentary for coal resource developments that are not modelled
- 3.7 Conclusion
- 3.7.1 Key findings
- 3.7.2 How to use this impact and risk analysis
- 3.7.3 Gaps, limitations and opportunities
- Contributors to the Technical Programme
- About this technical product