... degree of Master of Agricultural Economics in the University of Queensland Department of Agriculture August, 1991 3 Visually, degradation in arid regions removes the uniformity of landscape. ... water run-off. An increase in the number of flows of the Paroo River, the catchment of which lies almost wholly within the western mulga rangelands, is evidence of greater run-off. This ... stages of degradation were evident. It was left to Mills (1986b), in a land use study of 8.7 million hectares of mulga, to reveal the extent of the problem. His study found that 29 per cent of...