Interpretation of runoff processes in hydrological modelling-experience from the HBV approach

The process of development and application of the Hydrologiska Byråns Vattenbalansavdelning hydrological model over a time period of more than 40 years is reviewed and discussed. Emphasis is on the early modelling strategy and physical considerations based on contemporary research on runoff formation processes in the drainage basin. This includes areal considerations on the catchment scale, soil moisture and evapotranspiration and storages and discharge as represented by the response function of the model. The introduction of the concept of dynamic recharge and discharge areas is also addressed as well as the modelling of snow accumulation and melt. Some operational international experiences are also addressed. Copyright © 2015 John Wiley & Sons, Ltd.