Abstract
![CDATA[In rainfall-based flood estimation, several inputs are required to convert design rainfalls to design floods, including the critical storm duration, areal reduction factor, storm spatial & temporal patterns, losses, model parameters and baseflow. Each input has an associated degree of uncertainty, which can affect the shape and magnitude of the estimated design flood hydrograph. This paper evaluates the effects of these design inputs on the resulting design peak flows, which are compared with more reliable flood frequency estimates. A total of 37 complete storm events were selected for the Orara River catchment in Northern NSW. It was found that the IL-CL model produced more accurate design flood estimates than the IL-PL model. Variations in the selected temporal patterns were seen to have a significant effect on the design flood estimates, whilst variations in the areal reduction factor and RORB model parameter had a much smaller effect on design flood estimates. Overall this study has found that the assumption of ARI neutrality in the current design event approach can lead to significant uncertainties in design flood estimates due to the inherent difficulty in the selection of representative inputs.]]
Original language | English |
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Title of host publication | 2012 Hydrology and Water Resources Symposium : 19-22 November 2012, Dockside, Cockle Bay, Sydney, NSW Australia |
Publisher | Engineers Australia |
Pages | 792-799 |
Number of pages | 8 |
ISBN (Print) | 9781922107626 |
Publication status | Published - 2012 |
Event | Hydrology and Water Resources Symposium - Duration: 19 Nov 2012 → … |
Conference
Conference | Hydrology and Water Resources Symposium |
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Period | 19/11/12 → … |
Keywords
- New South Wales
- computer simulation
- flood forecasting