 Budaiko's theory suggests that the amount of available water and energy determine the long-term catchment water balance. However, it does not account for the complex interactions between climate, vegetation, and soil properties that can affect the partitioning of water resources within a catchment. To better understand these interactions, we used a physically-based hydrologic model to separate out the effects of climate and landscape characteristics on the partitioning of water resources. We found that catchments with longer subsurface storage release times tend to produce more E slash P, suggesting that the time scale of subsurface storage release is important in determining the partitioning of water resources. Additionally, climates that produce more E slash P are associated with catchments with vegetation with lower light use efficiency and lower root fraction, indicating that vegetation and soil properties play a key role in determining the partitioning of water resources. These results suggest that the co-evolution of catchment vegetation and soils with climate must be taken into consideration to accurately predict hydrologic partitioning in ungaged basins. This article was authored by Piatrok, G. Carrillo, M. Sevapolin, and others. We are article.tv. Links in the description below.