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The general approach in these models is to use rainfall and evaporation data as inputs. Stream flow is produced as a model output, often as the sum of quick flow and slow flow components, as illustrated in Figure 1 (Note that slow quick flow includes lateral subsurface throughflow  - also known as interflow - as well as baseflow, but for the purposes of the SRG it is lumped together with baseflowsurface runoff). If evaporation data is not available, temperature may be used as an input in some models (e.g. IHACRES Classic). The complexity of the models varies considerably from four parameter models (e.g. GR4J) to models with a large number of conceptual stores and parameters (e.g. the Sacramento model).

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