GLENELG HOPKINS REGIONAL FLOODPLAIN MANAGEMENT STRATEGY Photo: Treloar Roses, Bolwara, August 2013 Source: Linda Jemmett
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GLENELG HOPKINS REGIONAL FLOODPLAIN MANAGEMENT STRATEGY Photo: Treloar Roses, Bolwara, August 2013 Source: Linda Jemmett Disclaimer: While every effort is made to provide a high-quality publication, Glenelg Hopkins CMA does not give any guarantees, undertakings or warranties concerning the accuracy, completeness or up-to-date nature of the information in the document and, therefore, disclaims all liability from error, loss or other consequence that may arise from reliance on this publication. © Glenelg Hopkins Catchment Management Authority (2017) This work is the subject of copyright. All rights reserved. No part of this work may be reproduced, adapted, published or communicated (made available online or electronically transmitted) to the public, without the prior written permission of Glenelg Hopkins Catchment Management Authority or as expressly permitted by the Copyright Act 1968 (as amended) (Cth) or other copyright laws. All authorised or permitted, reproduction, adaptation, publication or Cover Photo (top): Major flooding communication (made available online or electronically transmitted) to of Skipton township as seen the public, of the work or part thereof must include full acknowledgement from the air, 15 January 2011 of the source and Glenelg Hopkins Catchment Management Authority’s Source: Corangamite Shire Council ownership of copyright. All enquiries and requests for permission should Cover Photo (bottom): be made to Glenelg Hopkins Catchment Management Authority, Head Casterton in Flood, 1906. Office: 79 French Street, PO Box 502, Hamilton, Victoria, 3300. Source: J. T. Sommerville GLENELG HOPKINS 2 REGIONAL FLOODPLAIN MANAGEMENT STRATEGY Table of Contents Executive Summary 4 Local Government Authorities 31 Part 1 – Strategic Context 8 Traditional Owner Groups 32 Relationship to the Victorian Floodplain Important Regional and Community Infrastructure 33 Management Strategy 8 Part 3 – Analysing Risk Treatment Policies and Strategies Influencing Floodplain Service Levels 34 Management 8 Planning Scheme Controls 35 Purpose and Scope of Regional Floodplain Management Strategy 10 Structural Flood Mitigation Works and Their Management Arrangements 36 How was the Strategy Developed? 10 Existing Significant Flood Mitigation Infrastructure 36 Consultation Process 11 Municipal Emergency Management Plans 37 Regional Overview 12 Total Flood Warning System 38 Exposure to Flooding 16 Total Flood Warning System Assessment Tool Cultural Significance of Floodplains 38 for Traditional Owners 18 Cultural Heritage Assessment and Protection 40 Climate Change 19 Vegetation 40 Working with the Environment to Hold Case Study: Russell Creek 41 and Slow Floodwater 19 Part 4 – Development and Improvement Plan 42 Vision and Objectives for Floodplain Management within the Region 20 Regional Risk Levels 43 Review of Previous RFMS and Progress Against Determining Preferred Management Actions 44 Floodplain Management Objectives in Regional The Strategy for Floodplain Management in the Catchment Strategy 21 Glenelg Hopkins Region 45 Achievements 22 Preferred Management Actions and Asset Management 23 Regional Work Plan 45 Local Flood Studies and Floodplain Part 5 – Monitoring, Evaluation, Review and Management Plans 23 Improvement Plan 48 Statutory Planning 23 Program Logic 48 Emergency Response Including Flood Warning 23 Assumptions 50 Information Management 24 MER stages 50 Education and Community Awareness 24 Monitoring 50 Case Study: Floodplain Management in Action Evaluation 51 – Reducing the Risk for Skipton 25 Reporting 52 Part 2 – Regional Risk Assessment 26 Improvement 52 Integrated Catchment Management Threats and Opportunities 26 Governance and Accountability 52 Consideration of Stormwater Management Issues 27 References 53 Consideration of Rural Drainage Issues 27 Appendix I – Regional Catchment Strategy 2013 – 2019 54 Flood Risk for Coasts and Estuaries 28 Appendix II – Urban Management Units Identified Regional Risk Assessment Results 29 as Having a Significant Flood Risk 55 Stakeholder Engagement 30 Appendix III – Existing Flood Mitigation Infrastructure 55 Community Identified Risks 30 Appendix IV – Preferred Management Actions 56 GLENELG HOPKINS REGIONAL FLOODPLAIN MANAGEMENT STRATEGY 3 Executive Summary About the Strategy Development Approach The Glenelg Hopkins Regional Floodplain The RFMS was developed in accordance with Management Strategy (RFMS) builds on the extensive guidelines from the Department of Environment, work that has been undertaken over the past decade Land, Water and Planning (DELWP). These guidelines to improve management and reduce flood risks are aligned with the principles of the National across the region. Emergency Risk Assessment Guidelines and outline consistent methods for assessing flood risks and Glenelg Hopkins Catchment Management Authority determining community tolerance for such risks. (GHCMA) led the development of the strategy in collaboration with Local Government Authorities The development process involved undertaking an (LGAs), the Victoria State Emergency Service (VICSES), assessment of flood risks across the region, assessing Traditional Owners, other agency partners and the and ranking these risks, then determining how well community. the existing planning schemes, flood mitigation infrastructure, Municipal Flood Emergency Plans This strategy interprets and applies the policies, and flood warning arrangements are aligned with actions and accountabilities of the Victorian the flood risk ranking for each management unit. Floodplain Management Strategy (VFMS) in managing This process informed the establishment of regional flood risks at the regional and local level. It provides floodplain management priorities. a single regional planning document for floodplain management and a high-level list of regional priorities to guide future investment. Community and Stakeholder Consultation Process The primary role of the RFMS is to assist agencies that The development of this strategy involved an have floodplain management and flood emergency extensive community consultation process. Public management functions to align their priorities and consultation sessions were held at 10 locations maximise community benefits with available funding. at Harrow, Casterton, Heywood, Hamilton, Port Regional strategies represent future business Fairy, Warrnambool, Ararat, Beaufort, Skipton and cases for investment by government in floodplain Miners Rest. In addition, more than 2000 letters management. The new regional strategies replace advising residents how they could be involved in the the previous regional strategies prepared by CMAs development of the strategy were sent out in areas at between 1998 and 2001. risk of flooding. Many lessons arose from the major regional floods Flooding in the Glenelg Hopkins Region of 2016 and 2010 – 11. The community consultation process provided the opportunity to draw on Floods are natural and inevitable events. Fortunately, community knowledge relating to these and other the location, the scale of effects and the probability flood events that have occurred across the region. of occurrence can be estimated with reasonable accuracy for a range of floods events. Consultation was also undertaken with Traditional Owners across the region, and workshops were held There is a history of flooding along the Glenelg, with LGAs including Ararat Rural City Council, Ballarat Hopkins and Merri Rivers, and flash flooding has City Council, Corangamite Shire Council, Glenelg Shire occurred in urban centres, most recently in Coleraine Council, Moyne Shire Council, Pyrenees Shire Council, in 2016. The most significant regional floods on Southern Grampians Shire Council, Warrnambool City record occurred in 1946, when major flooding Council, and West Wimmera Shire Council. occurred within the Portland Coast basin, and to a lesser degree in the lower Glenelg and Hopkins A steering committee was established to oversee the basins, significantly impacting the communities of development of the project with representation from Portland, Port Fairy and Warrnambool. VICSES, LGAs, Glenelg Hopkins CMA and the Glenelg Hopkins Community Advisory Group. Compared with some other areas of Victoria, flooding in the Glenelg Hopkins region happens relatively Local knowledge is critical to understanding quickly, with most floods draining from the top of the flood behaviour and options for flood mitigation. catchment to the estuaries within a week. Communities know their area best, and input from the community during the consultation process was Floods can sometimes result in significant economic integral to understanding flood behaviour and local and social consequences for towns and communities options for flood mitigation. and can impact key agricultural areas located on floodplains. Based on the detailed damages assessment undertaken as part of local flood investigations, total damages for the ten regional towns subject to the highest flood risk (with at least a 1% chance per year) has been estimated at over $25 million. A key future challenge will be to ensure the protection of life and property, while allowing rivers to maintain their natural flooding processes. GLENELG HOPKINS 4 REGIONAL FLOODPLAIN MANAGEMENT STRATEGY The Strategy for Floodplain Management in the Glenelg Hopkins Region Vision and Objectives Key Areas of Focus This strategy sets out the following vision for The RFMS seeks to aid continual improvement in floodplain management in the Glenelg Hopkins region: how flood risks are managed