Overall, it was found that the RKLS model was effective in determining soil erosion risk at a scale of 2.5m resolution for the Indian-McGregor watershed, which was expected. However, the use of SPI for the same task was found to lack enough detail and contrast under the topographical conditions of our study site. Although SPI analysis is a potential candidate for modelling soil erosion risk, it is likely that valid results would require a study area with larger variances in slope and topographical conditions. However, the overall effectiveness of SPI was shown in that it mimicked the outputs of the more effective RKLS model, which was effectively shown to correspond to gully positions in the ground cover overlay. Further research is needed in order to observe how SPI analysis functions under different topographical conditions, and potentially under different spatial resolutions before a verdict on its validity in this field can be determined.