Namoi assessment at a glance
This Figure 1). Eight of these ten coal resource developments have sufficient information to be modelled; potential from non-modelled mines are inferred from their location. The assessment is a regional overview of potential impacts on, and to, water-dependent ecological, economic and socioculturalconsidered the potential on water and due to ten future in the of NSW (
Headline finding: Results from regional-scale hydrological modelling indicate potential risks to 1415 km2 of ecosystems, 1892 km of streams, 2 springs and 724 water-dependent assets. More detailed local information is required to determine the level of risk and potential impacts, including quantifying potential hydrological changes in an additional 3629 km of streams within the zone that could not be modelled.
Groundwater: It is very unlikely (less than 5% chance) that more than 2299 km2 will experiencein the of greater than 0.2 m due to additional coal resource development. Of this, 287 km2 is in the alluvium. Modelling shows 0.01% of the lower Namoi alluvium, 8% of the upper Namoi allivium, and none of the main of the Great Artesian Basin could experience impacts. See .
Surface water: Regional-scale modelling indicates that changes in the streamflow of the Namoi River are minimal. However, Back, Merrygowen and Bollol creeks are very likely (greater than 95% chance) to experience changes in their streamflow, particularly in the number of. See .
Ecosystem impacts: Of the ecosystems in the subregion, floodplains or lowland riverine ecosystems near Maules, Back and Bollol creeks are most likely to experience impacts resulting from changes in hydrology. See
Asset impacts: 161 ecological assets are found in areas that are ‘more at risk of hydrological changes’ (). In the , risk could not be quantified for 10 unique ecological assets due to data limitations. See
The pink zone (defined further in) defines the area in the Namoi subregion, outside of which impacts are ruled out. The assessment of potential impacts therefore focused inside this zone, which combines: (i) the area with at least a 5% chance of exceeding 0.2 m drawdown due to additional coal resource development, and (ii) the area with at least a 5% chance of exceeding thresholds in specified surface water changes that arise due to additional coal resource development.
Data: Bioregional Assessment Programme ()
- Executive summary
- Explore this assessment
- About the subregion
- How could coal resource development result in hydrological changes?
- What are the potential hydrological changes?
- What are the potential impacts of additional coal resource development on ecosystems?
- What are the potential impacts of additional coal resource development on water-dependent assets?
- How to use this assessment
- Building on this assessment
- References and further reading
- Contributors to the Technical Programme