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Wingham Flood Study Review and Upgrade GREATER TAREE CITY COUNCIL Wingham Flood Study Review and Upgrade 301015-01997 12-May-2011 Advanced Analysis Level 12, 141 Walker Street North Sydney NSW 2060 Australia Tel: +61 2 8456 6934 Fax: +61 2 8456 6966 Web: http://www.worleyparsons.com WorleyParsons Services Pty Ltd ABN 61 001 279 812 © Copyright 2010 WorleyParsons Services Pty Ltd GREATER TAREE CITY COUNCIL WINGHAM FLOOD STUDY REVIEW AND UPGRADE FOREWORD The Wingham Flood Study involves the comprehensive review and upgrade of the broad based “Manning River Flood Study” (NSW Public Works Department; 1991) . The primary objective is to create a sophisticated 2D hydraulic model which will accurately simulate flooding in Wingham. This, in conjunction with an improved Hydrologic Model of the Cedar Party Catchment, will provide refined flood data on Wingham and therefore establish a sound base for the development of a Wingham Floodplain Risk Management Study and Plan according to the “Floodplain Development Manual” (New South Wales Government; 2005) . This document should be read in conjunction with the “Wingham Floodplain Risk Management Study” and the “Wingham Risk Management Plan” (both produced 2010 by WorleyParsons) where the collective objective is to reduce the impact of flooding and to reduce private and public losses resulting from floods. At the same time, the unnecessary sterilisation of flood prone land is avoided by recognising the benefits arising from its use, occupation and development. Disclaimer This report has been prepared on behalf of and for the exclusive use of Greater Taree City Council, and is subject to and issued in accordance with the agreement between Greater Taree City Council and WorleyParsons Services Pty Ltd. WorleyParsons Services Pty Ltd accepts no liability or responsibility whatsoever for it in respect of any use of or reliance upon this report by any third party. Copying this report without the permission of Greater Taree City Council or WorleyParsons Services Pty Ltd is not permitted. PROJECT 301015-01997 - WINGHAM FLOOD STUDY REV DESCRIPTION ORIG REVIEW WORLEY- DATE CLIENT DATE PARSONS APPROVAL APPROVAL A Internal Review N/A 15-Jan-2010 N/A J Merhebi D McConnell B GTCC Draft Review 01-Feb-2010 J Merhebi D McConnell C Revised Draft 20-April-2010 J Merhebi D McConnell 004 Final 12-May-2011 J Merhebi D McConnell t:\301015-01997-wingham frms\reports and documents\reports - current\301015-01997-rep-0001a-004 winghamfs.docx Page ii GREATER TAREE CITY COUNCIL WINGHAM FLOOD STUDY REVIEW AND UPGRADE CONTENTS 1. INTRODUCTION ................................................................................................................ 1 1.1 Overview ............................................................................................................................. 1 1.2 Study Area .......................................................................................................................... 1 1.3 Flood History ....................................................................................................................... 2 1.4 Previous Studies and Policy ............................................................................................... 4 2. FLOOD STUDY SUMMARY ............................................................................................... 6 3. DATA COLLECTION .......................................................................................................... 7 4. HISTORICAL FLOOD BEHAVIOUR AND FLOODING MECHANISMS ............................ 9 4.1 Summary of the 1978 Flood Event ................................................................................... 10 5. HYDROLOGY ................................................................................................................... 12 5.1 Review of previous Flood Study’s Hydrology ................................................................... 12 5.2 Methodology ..................................................................................................................... 13 5.3 Model Calibration and Verification .................................................................................... 15 5.3.1 Initial Calibration Parameters ............................................................................... 15 5.3.2 Flow Volume Calibration ...................................................................................... 15 5.3.3 Peak Flow Calibration using the Rational Method ............................................... 16 5.3.4 Verification using the 1978 Historic Flood Event ................................................. 17 5.3.5 Summary of Verified Calibration Parameters ...................................................... 19 5.4 Design Storm Simulations ................................................................................................ 20 5.5 Results .............................................................................................................................. 20 6. HYDRAULICS ................................................................................................................... 23 6.1 Review of previous Flood Study’s Hydraulic Analyses ..................................................... 23 6.2 Methodology ..................................................................................................................... 24 6.2.1 Manning Catchment Hydraulic Model .................................................................. 24 6.2.2 Cedar Party Catchment Hydraulic Model ............................................................ 27 6.3 Model Calibration and Verification .................................................................................... 31 6.3.1 Initial Calibration Process .................................................................................... 32 6.3.2 1978 Flood Event ................................................................................................. 33 t:\301015-01997-wingham frms\reports and documents\reports - current\301015-01997-rep-0001a-004 winghamfs.docx Page iii 301015-01997 : Rev 004 : 12-May-2011 GREATER TAREE CITY COUNCIL WINGHAM FLOOD STUDY REVIEW AND UPGRADE 6.3.3 1990 Flood Event ................................................................................................. 43 6.3.4 1995 ..................................................................................................................... 47 6.3.5 Summary of Verified Calibration Parameters ...................................................... 52 6.4 Design Flood Simulations ................................................................................................. 54 6.5 Results .............................................................................................................................. 56 6.5.1 Manning Catchment Hydraulic Model .................................................................. 56 6.5.2 Cedar Party Catchment Hydraulic Model ............................................................ 72 7. REFERENCES ................................................................................................................. 88 Appendices APPENDIX A – TABULATED HYDROGRAPH DATA APPENDIX B – DETAILED HYDRAULIC MODEL PLOTS (SEPARATE A3 DOCUMENT) t:\301015-01997-wingham frms\reports and documents\reports - current\301015-01997-rep-0001a-004 winghamfs.docx Page iv 301015-01997 : Rev 004 : 12-May-2011 GREATER TAREE CITY COUNCIL WINGHAM FLOOD STUDY REVIEW AND UPGRADE 1. INTRODUCTION 1.1 Overview Wingham is located approximately 45 kilometres upstream along the Manning River at the confluence of Cedar Party Creek. Due to the importance of the Manning River as a transport route, Wingham was established at the furthest point supply boats could reach up the river and therefore became the regions major port. A large portion of Wingham is elevated high above the floodplain; however some portions, including Wingham peninsula, consist of undulating river terrace at a general elevation of less than 12 m AHD. In its 178 years of European settlement, many floods of varying severity and impact have been recorded in Wingham. However in this time, none have had an Annual Exceedance Probability (AEP) greater than 1%, with the largest being approximately equal to a 1% AEP and occurring in July 1866. More recent floods of moderate magnitude have occurred in 1978 and 1990. The 1978 flood in particular was one of the largest floods on record (estimated to be less than a 1% but greater than a 2% event) which required the evacuation of residents and led to substantial property damage. These events, and other significant floods in Wingham, have led to large property losses, injury and in some instances, loss of life. The most important issue, reported by those who experienced these flood events, was not so much the peak level of the flood but was the rapid rise in levels which left little time to respond. In portions of Wingham Peninsula, this risk is exacerbated further by the undulating topography which can become rapidly isolated. The purpose of this Flood Study is to develop a sophisticated, calibrated 2D hydraulic model that will accurately simulate flooding in the region of Wingham. This requires a hydrological analysis of rainfall over the Cedar Party Creek catchment in order to produce the necessary hydrograph inputs for Stony and Cedar Party Creek. A hydrological assessment associated with the Manning River and Dingo Creek was undertaken as part of the “Manning River Flood Study” (NSW Public Works
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