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Effects of non-linearity in storage-discharge relationships on design flood estimates

Rahman, Ataur & Goonetilleke, Ashantha (2001) Effects of non-linearity in storage-discharge relationships on design flood estimates. In MODSIM 2001 International Congress on Modelling and Simulation, 10-13 December 2001, Australian National University, Canberra, Australia.

Abstract

Rainfall-based flood estimation techniques are commonly adopted in hydrological design. Runoff routing models are widely used in Australia, which use either a linear or nonlinear storage-discharge relationship. Australian Rainfall and Runoff recommends the use of a nonlinear storage-discharge relationship; though, many have proposed other types of storage-discharge relationships. This paper adopts a Monte Carlo simulation technique to examine the effects of nonlinearity in storage-discharge relationship on design flood estimates. This simulates thousands of rainfall events, which are then routed through a runoff routing model to generate streamflow hydrographs. The nonlinearity parameter in the storage discharge relationship is varied to quantify its effects on design flood estimates. It is found that nonlinearity parameter has significant effect on design floods, particularly for larger floods. Results from three study catchments indicate that a nonlinear storage-discharge relationship is preferable to linear relationship.

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ID Code: 4331
Item Type: Conference Paper
Additional URLs:
Keywords: Runoff routing, Storage, discharge relationship, Flood estimation, Design floods
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Water Quality Engineering (090508)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Engineering Modelling (090702)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Engineering Design (090701)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2001 (please consult author)
Deposited On: 30 May 2006
Last Modified: 09 Jun 2010 22:32

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