Rainfall Models for Catchment Simulation

Engineers Media Pty. Ltd.
Publication Type:
Journal Article
Australian Journal of Water Resources, 2005, 9 (1), pp. 55 - 67
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A catchment modelling system for simulation of both the quantity and quality of stormwater runoff can be considered to consist of four conceptual components, which are generation, collection, transport and disposal. Within each of these components, there are many alternative transformations available, with each of these transformations being the result of different combinations of process models. There are numerous combinations of transformations and information from apreceding component that map to asingle output. The concept ofsystem calibration, therefore, is to select the appropriate transformations and informationfor the catchment being simulated. Within the generation conceptual component, an important aspect is the model used to transform the point rainfall measurements into a spatially distributed rainfall over the catchment. There have been many alternative models proposedfor this transformation. Presented herein is an analysis of the influence ofalternative rainfall models on the simulated hydrograph and hence the influence on the system calibration. This analysis will be based on real events recorded at the outlets ofthe Centennial Park catchment (1.3 km2) and the upper Parramatta River catchment (110 km2) in Sydney, Australia. It will be shown from this analysis that the influence ofthe rainfall model is related to the spatial and temporal variability of the storm event
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