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Abstract
The runoff routing model structure is commonly used for flood estimation in Australia. There are several models in use including RORB, RAFTS, URBS and WBNM, but they all have as their structure the sub-division of the catchment, the application of rainfall excess from generally one process to each sub-catchment, and the routing of this excess rainfall through a series of non-linear storages to the catchment outlet. One issue that has been identified with RORB and WBNM is that the models are not internally or self-consistent, with the subdivision of the model having an effect on the model result. This paper describes an investigation into the links between runoff routing storage parameters for the RORB and RAFTS models. The investigation revealed that the relationship was satisfactory for single node RAFTS models, but not for multiple nodes. This confirmed that the RAFTS model with multiple nodes is not internally consistent and regional storage parameters are affected by the number of nodes in individual models. The consequences of the lack of self-consistency are described. They can be reduced, but not eliminated as they are an integral consequence of the runoff routing model structure.