Concentrations from the gullied catchments (G4, G5, and G6) were an order of magnitude higher than from the ungullied catchments.
Highest annual sediment yields for the gullied catchments occurred in 1989 and 1990 when high rainfall resulted in soil saturation, and high runoff, and sediment transport.
Despite the inherent sources of error associated with all methods of monitoring there appears to be reasonable correspondence between the yields determined from this study, for both ungullied pasture catchments and gullied catchments, and those derived for the Southern Tablelands using other techniques, such as farm dam surveys and radionuclide studies.
The Mars Orbiter Camera team has found many sites on Mars with fresh-looking gullies, and checked back at more than 100 gullied
sites for possible changes between imaging dates, but this is the first such find.