The bioregional assessment found that additional coal resource development is predicted to cause minor hydrological change in the Gloucester subregion. No impacts on ecological assets are predicted in the south, given the limited additional coal resource development. In the north, potential impacts on ecological assets are expected to be minor and localised because predicted hydrological changes are small.
The bioregional assessment for the Gippsland Basin bioregion found that extending the Yallourn, Hazelwood and Loy Yang coal mines would draw down groundwater and reduce baseflow in the Latrobe River. There has been no coal seam gas production in the Gippsland Basin bioregion and limited exploration for coal seam gas.
This bioregional assessment found that there is limited potential for additional coal resource development in the Central West subregion. The Ulan Mine Complex is located on the catchment boundary between the Central West and Hunter subregions. The Hunter bioregional assessment considers potential impacts to water resources from the Ulan Mine Complex, but it did not model impacts in the Central West region.