Estimation of Peak Design Discharges within the Mackay Region

Brigg, Hayden (2017) Estimation of Peak Design Discharges within the Mackay Region. [USQ Project]

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Flooding is known to be one of the worst natural disasters and can lead to significant economic damage. The design of flood mitigation measures makes up a significant sector of the civil engineering industry, as well as the assessment of flood risk imposed on existing landscape by new development.

There is currently a variety of methods that are prescribed to the industry as to how to best estimate design floods and their associated peak design discharge. The release of the 2016 revision of the Australian Rainfall and Runoff (ARR) guidelines in late 2016 has introduced new methodologies which may impact infrastructure that has been designed to set flood immunities set out by historical guidelines.

This research project aims to explore methods of calculating design discharge estimates for ungauged catchments, particularly within the Mackay Regional Council boundary. These methods include the Rational Method, at site Flood Frequency Analysis (FFA), the Regional Flood Frequency Estimation (RFFE) Model, rainfall runoff-routing modelling software (WBNM) and hydrodynamic software modelling (TUFLOW). The project also investigates the application of different design rainfall event approaches including the simple and ensemble events as outlined in the ARR 2016 guidelines. Through investigating these various methods and approaches, a comparison of results to existing studies and recorded data was made, with commentary provided on the strengths and shortfalls of each method.

The hydrodynamic (TUFLOW) modelling method was found to deliver what was perceived as the most realistic peak design discharge estimate for sites within the Mackay Region, with other methods having their own limitations for application. The application of the ARR 2016 design rainfall and hydrologic parameters was found to cause a decrease in peak discharges when compared to that of the ARR 1987 counterparts.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Alam, Md Jahangir; Brodie, Ian; Collett, Melanie
Date Deposited: 13 Sep 2022 02:01
Last Modified: 13 Sep 2022 02:01
Uncontrolled Keywords: flooding; peak; design discharge; ungauged catchments

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