Comparison of regional flood methods in New South Wales

Gilmore, I; Stensmyr, P; Babister, M; Retallick, M; Ball, J

Comparison of regional flood methods in New South Wales

Gilmore, I Stensmyr, P Babister, M Retallick, M Ball, J

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Publication Type:: Conference Proceeding
Citation:: Hydrology and Water Resources Symposium 2014, HWRS 2014 - Conference Proceedings, 2014, pp. 836 - 843
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Gilmore, I	en_US
dc.contributor.author	Stensmyr, P	en_US
dc.contributor.author	Babister, M	en_US
dc.contributor.author	Retallick, M	en_US
dc.contributor.author	Ball, J https://orcid.org/0000-0001-8342-1916	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Hydrology and Water Resources Symposium 2014, HWRS 2014 - Conference Proceedings, 2014, pp. 836 - 843	en_US
dc.identifier.isbn	9781922107190	en_US
dc.identifier.uri	http://hdl.handle.net/10453/136413
dc.description.abstract	One of the most common problems facing flood engineers is how to predict flows from ungauged catchments. Various techniques have been developed by engineers to solve this problem. When time and resources are limited one option is to use Regional Flood Frequency Estimation (RFFE) to give an estimate of the flood quantile, acknowledging the added uncertainty in the estimate. RFFE involves using regionalised gauged flood data to estimate flood quantiles of an ungauged catchment. The RFFE method for eastern NSW specified in Australian Rainfall & Runoff 1987 (ARR87, Pilgrim, 1987) was the Probabilistic Rational Method (PRM). In order to improve the predictions from RFFE; as part of the revision of Australian Rainfall & Runoff (ARR) various RFFE methods were investigated. As part of Project 5 of the ARR revision the Parameter Regression Technique - Generalised Least Squares (PRT-GLS) method has been developed and recommended for use in New South Wales. It is important to quantify the difference in predicted flood discharges between the old and the new RFFE methods. ARR Revision Project 5 of the compared both methods and determined that the PRT-GLS provides a more robust estimate. However no guidance was given on the expected differences between the predictions. The aim of this paper is to compare the Probabilistic Rational Method (as presented in ARR87) with the PRT-GLS across eastern New South Wales (as developed as part of ARR Revision Project 5 ). The two methods will be compared spatially for various catchment sizes and for a range of flood quantiles. The aim of this comparison is not to determine which method is more accurate; but is to give guidance to engineers on the differences in predicted flood discharges.	en_US
dc.relation.ispartof	Hydrology and Water Resources Symposium 2014, HWRS 2014 - Conference Proceedings	en_US
dc.title	Comparison of regional flood methods in New South Wales	en_US
dc.type	Conference Proceeding
utslib.for	040608 Surfacewater Hydrology	en_US
utslib.for	090509 Water Resources Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US

Abstract:

One of the most common problems facing flood engineers is how to predict flows from ungauged catchments. Various techniques have been developed by engineers to solve this problem. When time and resources are limited one option is to use Regional Flood Frequency Estimation (RFFE) to give an estimate of the flood quantile, acknowledging the added uncertainty in the estimate. RFFE involves using regionalised gauged flood data to estimate flood quantiles of an ungauged catchment. The RFFE method for eastern NSW specified in Australian Rainfall & Runoff 1987 (ARR87, Pilgrim, 1987) was the Probabilistic Rational Method (PRM). In order to improve the predictions from RFFE; as part of the revision of Australian Rainfall & Runoff (ARR) various RFFE methods were investigated. As part of Project 5 of the ARR revision the Parameter Regression Technique - Generalised Least Squares (PRT-GLS) method has been developed and recommended for use in New South Wales. It is important to quantify the difference in predicted flood discharges between the old and the new RFFE methods. ARR Revision Project 5 of the compared both methods and determined that the PRT-GLS provides a more robust estimate. However no guidance was given on the expected differences between the predictions. The aim of this paper is to compare the Probabilistic Rational Method (as presented in ARR87) with the PRT-GLS across eastern New South Wales (as developed as part of ARR Revision Project 5 ). The two methods will be compared spatially for various catchment sizes and for a range of flood quantiles. The aim of this comparison is not to determine which method is more accurate; but is to give guidance to engineers on the differences in predicted flood discharges.

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http://hdl.handle.net/10453/136413