Draft Floodplain Management Plan for the Border Rivers Valley Floodplain 2018 (Draft Border Rivers Valley FMP)
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Rural floodplain management plans Water Management Act 2000 Background document to the floodplain management plan for the Border Rivers Valley Floodplain 2018 industry.nsw.gov.au Publisher: NSW Department of Industry – Water Title: Rural floodplain management plans: Background document to the floodplain management plan for the Border Rivers Valley Floodplain 2018 First published November 2017 More information www.water.nsw.gov.au © State of New South Wales through the Department of Industry, 2017. You may copy, distribute and otherwise freely deal with this publication for any purpose, provided that you attribute the NSW Department of Industry – Water as the owner. Disclaimer: The information contained in this publication is based on knowledge and understanding at the time of writing (November 2017). However, because of advances in knowledge, users are reminded of the need to ensure that information upon which they rely is up to date and to check currency of the information with the appropriate officer of the NSW Department of Industry – Water or the user’s independent adviser. Rural floodplain management plans: Background document to the floodplain management plan for the Border Rivers Valley Floodplain 2018 Contents List of figures ........................................................................................................................... iii List of tables ............................................................................................................................. iv Abbreviations ............................................................................................................................ v Purpose ..................................................................................................................................... 7 The Border Rivers Valley Floodplain ....................................................................................... 7 Flooding in the proposed Border Rivers Valley Floodplain ..................................................... 11 Developing the plan ................................................................................................................ 14 Step 1: Define the floodplain boundary ................................................................................. 16 Step 2: Identify existing flood works ..................................................................................... 20 Step 3: Review existing rural floodplain management arrangements ................................. 21 NSW proposed Border Rivers Valley Floodplain .................................................................... 21 Qld Border Rivers Floodplain ................................................................................................. 21 Border Rivers Region ............................................................................................................ 21 Step 4: Determine the floodway network............................................................................... 23 Design floods ......................................................................................................................... 23 Hydrologic models ................................................................................................................. 25 Hydraulic models ................................................................................................................... 26 Hydraulic criteria for the floodway network............................................................................. 27 Step 5: Identify and prioritise floodplain assets ................................................................... 31 Ecological assets ................................................................................................................... 31 Cultural assets ....................................................................................................................... 41 Step 6: Prepare a socio-economic profile ............................................................................. 47 Study area geography ........................................................................................................... 47 Demographic profiles ............................................................................................................. 49 Step 7: Delineate management zones ................................................................................... 51 Description of management zones ........................................................................................ 51 Hydraulic criteria .................................................................................................................... 54 Ecological criteria .................................................................................................................. 54 Cultural criteria ...................................................................................................................... 59 Criteria to better reflect current floodplain management arrangements .................................. 60 Summary of management zone criteria ................................................................................. 61 Modifying a management zone .............................................................................................. 66 Step 8: Determine rules .......................................................................................................... 67 Authorised flood works .......................................................................................................... 67 Advertising requirements ....................................................................................................... 72 i Department of Industry – Water, November 2017 Rural floodplain management plans: Background document to the floodplain management plan for the Border Rivers Valley Floodplain 2018 Assessment criteria ............................................................................................................... 73 Existing flood works and structures........................................................................................ 78 Exemptions to flood work approvals ...................................................................................... 79 Step 9: Consider existing floodplain management arrangements ...................................... 80 Floodplain boundary .............................................................................................................. 81 Management zones ............................................................................................................... 81 Rules (including assessment criteria) .................................................................................... 82 Step 10: Assess socio-economic impacts ............................................................................ 86 Phase one assessment ......................................................................................................... 86 Phase two assessment .......................................................................................................... 93 Role of socio-economics in plan development ....................................................................... 93 Consultation and review of the plan ...................................................................................... 95 Consultation process ............................................................................................................. 95 Review .................................................................................................................................. 97 Plan finalisation and commencement ................................................................................... 99 References............................................................................................................................. 100 Glossary ................................................................................................................................ 104 ii Department of Industry – Water, November 2017 Rural floodplain management plans: Background document to the floodplain management plan for the Border Rivers Valley Floodplain 2018 List of figures Figure 1: The proposed Border Rivers Valley Floodplain............................................................. 7 Figure 2: The proposed Border Rivers Valley Floodplain and Border Rivers catchment .............. 8 Figure 3: Floodplain designated under Part 8 of the WA 1912 .................................................. 11 Figure 4: Ten steps used to develop rural floodplain management plans under the WMA 2000 .............................................................................................................. 15 Figure 5: Changes made to the existing Part 8, WA 1912 Lower Macintyre floodplain when delineating the proposed Border Rivers Valley Floodplain boundary ....................... 18 Figure 6: Changes made to the existing Part 8, WA 1912 Lower Macintyre floodplain when delineating the proposed Border Rivers Valley Floodplain boundary – eastern extent of the floodplain. ........................................................................................... 19 Figure 7: Overall footprint of constructed works ........................................................................ 20 Figure 8: Historical Floodplain Development Guideline areas in the proposed Border Rivers Valley Floodplain .........................................................................................