Australian Drainage Divisions and River Basin BoundariesAustralia's drainage divisions and river basins were formally defined by the Australian Water Resources Council in the early 1960s and, with minor modifications resulting from improved mapping of the inland arid zone area, have been the basis for the study of Australian hydrology since then. The 12 drainage divisions were defined by both the major topographic features of the continent and the main climatic zones to give broadly homogeneous hydrologic regions. Within the drainage divisions the 245 river basins are defined by the major watershed lines. The digital data set of the drainage divisions and river basins is available form Geoscience Australia, the national mapping agency.
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