Runoff prediction is among the most interesting subjects one can study. At the same time, and for exactly the same reasons, it is also among the most frustrating subjects. On the one hand, it is fascinating to zoom in on individual hydrologic processes, learn about the intricacies of hydrophobicity, transpiration thresholds, soil matrix flow gradients, and streambed roughness while discovering relationships between soil parameters, storage states, and runoff responses. On the other hand, it is always unsatisfying to observe the individual processes acting together in the connected system constituting the terrestrial part of the hydrologic cycle, only to realize that...

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