The data shows the distribution of groundwater flow systems at a national
scale. These flow systems were based on their hydrogeological characteristics
using a combination of geology, geomorphology and topographical (Digital
Elevation Model) information at a national scale. The groundwater flowsystems
identify the extent of groundwater processes contributing to salinity,
together with the characteristic hydrogeological processes considered likely
to result in dryland salinity given suitable climatic conditions.
See [further metadata](http://data.daff.gov.au/anrdl/metadata_files/pa_agfs_r9ab
l_00111a00.xml) for more detail.