Dataset: Preliminary Assessment Extent (PAE) for the Namoi subregion - v04



The dataset was derived by the Bioregional Assessment Programme. This dataset was derived from multiple datasets. You can find a link to the parent datasets in the Lineage Field in this metadata statement. The History Field in this metadata statement describes how this dataset was derived.

The PAE is derived from the intersection of surface water hydrology features, groundwater management units, mining development leases and/or coal seam gas (CSG) tenements, and directional flows of surface water and groundwater (Barrett et al., 2013). The process of defining the PAE is undertaken via consideration of the vertical and horizontal proximity and scale of surface water and groundwater connectivity pathways and potential for depressurisation or dewatering.

The Preliminary Assessment Extent (PAE) has been derived from the maximum extents of the respective input surface water and groundwater PAEs for the Namoi subregion.


The purpose of the PAE is to provide a first step in the process of determining whether a water-related link is possible between coal resource development and the assets. It is intended to be a realistic yet inclusive estimate of the land surface area where potential impacts might occur. As the model-data analysis, impact analysis and risk analysis components of a BA are completed it will be possible to more closely characterise and quantify impacts in terms of their extent and their likelihood.

Dataset History

The PAE boundary was defined from by performing a Union in ESRI ArcGIS of the respective versions of the groundwater and surface water PAEs.

Dataset Citation

Bioregional Assessment Programme (2014) Preliminary Assessment Extent (PAE) for the Namoi subregion - v04. Bioregional Assessment Derived Dataset. Viewed 11 December 2018,

Dataset Ancestors

General Information