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Study Report Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Golden Plains Shire

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Study Report Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Golden Plains Shire Study Report Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Golden Plains Shire 06 September 2018 Document Status Version Doc type Reviewed by Approved by Date issued 01 Draft Julian Skipworth Julian Skipworth 28/06/2018 02 Draft Ben Tate Ben Tate 03/08/2018 03 FINAL Ben Tate Ben Tate 06/09/2018 Project Details Project Name Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Client Golden Plains Shire Client Project Manager Angela Vary Water Technology Project Manager Lachlan Inglis Water Technology Project Director Julian Skipworth Authors Lachlan Inglis Document Number R07_V02c_Summary_Report_Inverleigh_FS Front Cover: 1973 Floods, taken from Hotel looking north across High St (Source: Inverleigh Historical Society) COPYRIGHT Water Technology Pty Ltd has produced this document in accordance with instructions from Golden Plains Shire for their use only. The concepts and information contained in this document are the copyright of Water Technology Pty Ltd. Use or copying of this document in whole or in part without written permission of Water Technology Pty Ltd constitutes an infringement of copyright. Water Technology Pty Ltd does not warrant this document is definitive nor free from error and does not accept liability for any loss caused, or arising from, reliance upon the information provided herein. PO Box 436 Geelong VIC 3220 Telephone 0458 015 664 ACN 093 377 283 ABN 60 093 377 283 R07_V03_Summary_Report_Inverleigh_FS.docx Golden Plains Shire | 06 September 2018 Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Page 1 EXECUTIVE SUMMARY The Leigh and Barwon Rivers at Inverleigh Flood Risk Management Study investigated the flood behaviour of the study area and developed a detailed understanding of the flood risk profile through Inverleigh. A review of existing hydrology developed by the Corangamite CMA was undertaken to develop the design flows for the Leigh River and Warrambine Creek. An updated Flood Frequency Analysis were carried out on the Barwon River at Inverleigh streamflow gauge. A hydraulic model was constructed using TUFLOW software with upstream boundaries at the Shelford gauge on the Leigh River, the Inverleigh gauge on the Barwon River, and the Warrambine Creek (5 km upstream of the Barwon River confluence). The hydraulic model was calibrated to three historic flood events; 1973 (considered the largest recorded flood event on the Leigh River), 1978 and 1995. Additional flood events from 2011 and 2016 were also used for validation. The calibration process utilised streamflow records, surveyed flood heights and community input including photos and anecdotal evidence. Upon completion of the calibration, design modelling was undertaken for a range of flood events from small events which mostly remain in channel to events larger than any flood previously observed. Modelling updates including flood depth, velocity and water surface elevation were used to develop proposed planning layers based on the 1% AEP flood events. The modelling has also identified several structural mitigation options to reduce flood risk, with two of these being modelled to show significant benefits in terms of reducing the frequency and magnitude of flooding through the Inverleigh township. Flood related planning overlays were reviewed based on the updated flood modelling, with recommendations made for a planning scheme amendment. The structural mitigation options identified, along with the updated planning information aim to treat the existing flood risk through the township. The study provides an improved understanding of flood behaviour through the study area. Flood intelligence information from the study was extracted and summarised to provide information to assist in raising awareness of flooding within the community and to improve the emergency response information available to VicSES, CFA and Council. A key component of the improved flood intelligence is using streamflow gauge predictions for upstream gauges (Leigh River at Inverleigh & Barwon River at Inverleigh) to provide predicted flood inundation at Inverleigh. The flood mapping data developed during this study has been formatted into the Victoria Flood Database format and it is recommended that this be uploaded to FloodZoom to allow emergency response agency staff access to the data. Following the investigations undertaken for this study it is recommended that: ◼ Corangamite CMA ◼ Endorse the flood study and use the flood mapping data to inform floodplain risk management decisions. ◼ Upload the Victoria Flood Database mapping data and the excel spreadsheet of property inundation to FloodZoom. ◼ Make use of the flood level information produced to issue advice for any floodplain development. ◼ Golden Plains Shire ◼ Endorse the flood study before putting it out for public comment with aim of adopting the flood study and implementing a planning scheme amendment to update the flood related planning overlays to introduce new LSIO and FO mapping into the planning scheme. R07_V03_Summary_Report_Inverleigh_FS.docx Golden Plains Shire | 06 September 2018 Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Page 2 ◼ Consider a detailed assessment of flood mitigation options, with a functional and detailed design project that includes a full flood damages assessment. It is strongly recommended that this option be pursued with all relevant stakeholders and considered within the Inverleigh Structure Plan. ◼ Make use of the flood level information produced to issue advice for any floodplain development. ◼ Request that the Bureau of Meteorology consider the following: ◼ Review the proposed Flood Class Levels of the Leigh River at Inverleigh from this study. ◼ Review the Flood Class Levels of the Leigh River at Shelford and bought in line with the proposed Flood Class Levels for Inverleigh from this study. ◼ Review the updated MFEP and discuss with VicSES the changes proposed by Water Technology prior to adopting the revised document. ◼ Actively promote the use of the VicEmergency website and App and the flood portal www.floodreport.com.au to the community to improve flood preparedness and awareness. ◼ Victoria State Emergency Service with assistance from Corangamite CMA and Golden Plains Shire Council: ◼ Continue to engage the community through regular flood awareness programs such as the VicSES FloodSafe program. ◼ Review the updated MFEP and discuss with council the changes proposed by Water Technology prior to adopting the revised document. R07_V03_Summary_Report_Inverleigh_FS.docx Golden Plains Shire | 06 September 2018 Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Page 3 CONTENTS GLOSSARY OF TERMS 6 1 INTRODUCTION 8 1.1 Study Area 8 1.2 Hydraulic Model and Mapping Extent 10 2 DATA REVIEW 11 2.1 Existing Flood Studies 11 2.2 Historic Flood Information 11 2.3 Topographic Data 12 2.3.1 Available Data Sets 12 2.3.2 LiDAR Verification 12 2.3.3 DEM Development 13 2.4 Hydraulic Structure Information 14 2.5 Hydrological Data 14 2.5.1 Daily Rainfall Data 14 2.5.2 Sub-Daily Rainfall Data 15 2.5.3 Streamflow Data 17 3 PROJECT CONSULATION 19 3.1 Steering Committee 19 3.2 Community Consultation 19 4 FLOOD BEHAVIOUR 20 4.1 Overview 20 4.2 Hydrology Summary 20 4.3 Hydraulics Summary 22 4.3.1 Hydraulic Modelling 22 4.3.2 Understanding Flood Behaviour 23 5 ASSESS AND TREAT RISK 27 5.1 Structural Mitigation 27 5.2 Planning Controls 29 5.3 Flood Warning 31 6 FLOOD BEHAVIOUR AND INTELLIGENCE OUTPUTS 32 6.1 Model Results 32 6.1.1 Data Sets 32 7 SUMMARY OF INVESTIGATION 34 7.1 Key Outcomes 34 7.2 Conclusions 36 R07_V03_Summary_Report_Inverleigh_FS.docx 7.3 Recommendations 36 Golden Plains Shire | 06 September 2018 Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Page 4 8 REFERENCES 38 Streamflow Gauge Quality Codes (BoM) 40 APPENDICES Appendix A Streamflow Gauge Data Records LIST OF FIGURES Figure 1-1 Barwon River, Leigh River and Woady Yaloak Creek Catchments 9 Figure 1-2 Mapping Area and Additional Waterways modelled in 1D 10 Figure 2-1 Extent of LiDAR Datasets 12 Figure 2-2 Transect Survey on the Inverleigh-Winchelsea Road 13 Figure 2-3 Transect Survey on Napier St (in Inverleigh) 13 Figure 2-4 Daily and Sub-Daily Rainfall gauges in the broader catchment region 16 Figure 2-5 Key Streamflow Gauges for the Study 18 Figure 4-1 Flood Mapping Extent 23 Figure 5-1 1% AEP Depths for Mitigation Option 1 27 Figure 5-2 1% AEP Depths for Mitigation Option 2 28 Figure 5-3 Flood Level Difference Plot for Mitigation Option 1 28 Figure 5-4 Flood Level difference plot for mitigation option 2 29 Figure 5-5 Proposed Planning Overlays 30 Figure 6-2 Proposed Flood Class Level Extents for the Leigh River at Inverleigh 31 Figure 7-1 Properties Flooded Above Floor (Combined 1% AEP events) 35 LIST OF TABLES Table 2-1 Summary of Previous Flood Study reports 11 Table 2-2 Historic Flood Event Information 11 Table 2-3 LiDAR Survey Verification 13 Table 2-4 Active Daily Rainfall Gauges in the Barwon, Leigh, Warrambine and Woady Yaloak Catchments 14 Table 2-5 Pluviograph Rainfall Stations in the broader study area 15 Table 2-6 Streamflow Gauge Record Summary 17 Table 4-1 Adopted Peak Flows for Design Events 21 Table 4-2 Design Event Combinations 21 Table 4-3 Summary of Flood Behaviour for Various Flood Events on the Leigh River 23 Table 4-4 Summary of Flood Behaviour for Various Flood Events on the Barwon River 25 R07_V03_Summary_Report_Inverleigh_FS.docx Golden Plains Shire | 06 September 2018 Flood Risk Management Study – Leigh and Barwon Rivers at Inverleigh Page 5 GLOSSARY OF TERMS Annual Exceedance Refers to the probability or risk of a flood of a given size occurring or being Probability (AEP) exceeded in any given year. A 90% AEP flood has a high probability of occurring or being exceeded; it would occur quite often and would be relatively small. A 1% AEP flood has a low probability of occurrence or being exceeded; it would be fairly rare, but it would be of extreme magnitude.
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