Wonogiri in Central Java, Indonesia, is an erosion-prone reservoir area. Though cultivation of mountainside slope is an important income source, it is the largest cause of rapid sedimentation in a downstream reservoir. In addition, it may not be a sustainable way of agriculture due to soil loss. For both sustainable regional economy and sustainable use of the reservoir, countermeasures for the upland crop field are being recommended. This research considered preferable development strategies, using estimated input-output data. Comparison of development scenarios implies that promotion of rice sector may be a preferable strategy.