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Moulamein Flood Study Moulamein Flood Study Stage 3 Report Prepared For Murray River Council September 2019 HydroSpatial Pty Ltd ABN: 23 624 304 070 Suite 10, Level 14, 70 Pitt Street, Sydney NSW 2000 Contact: Erika Taylor Email: [email protected] Mobile: 0423 624 696 COPYRIGHT NOTICE This document, Moulamein Flood Study 2019, is licensed under the Creative Commons Attribution 4.0 Licence, unless otherwise indicated. Please give attribution to: © Murray River Council 2019 We also request that you observe and retain any notices that may accompany this material as part of the attribution. Notice Identifying Other Material and/or Rights in this Publication: The author of this document has taken steps to both identify third-party material and secure permission for its reproduction and reuse. However, please note that where these third-party materials are not licensed under a Creative Commons licence, or similar terms of use, you should obtain permission from the rights holder to reuse their material beyond the ways you are permitted to use them under the ‘fair dealing’ provisions in the Copyright Act 1968. Please see the Table of References at the rear of this document for a list identifying other material and/or rights in this document. Further Information For further information about the copyright in this document, please contact: Murray River Council 20 Tualka Terrace, Moulamein, NSW, 2733 [email protected] 1300 087 004 DISCLAIMER The Creative Commons Attribution 4.0 Licence contains a Disclaimer of Warranties and Limitation of Liability. In addition: This document (and its associated data or other collateral materials, if any, collectively referred to herein as the ‘document’) was produced by HydroSpatial Pty Ltd for Murray River Council only. The views expressed in the document are those of the author(s) alone, and do not necessarily represent the views of Murray River Council. Reuse of this document or its associated data by anyone for any other purpose could result in error and/or loss. You should obtain professional advice before making decisions based upon the contents of this document. 18010_Moulamein_FS_Stage3_R03.docx Project Details Project Name Moulamein Flood Study, Floodplain Risk Management Study and Plan (C2017-2018/02) Client Murray River Council Author Tim Morrison, Erika Taylor, Michael Wyk Job Number 18010 Document Stage Stage3 Document Version R03 Document Name 18010_Moulamein_FS_Stage3_R03.docx Document Version Control Version Stage Release Author Reviewer Date R01 Stage 1 Submission Erika Taylor Tim Morrison 02/10/2019 R02 Stage 2 Submission Erika Taylor Tim Morrison 09/04/2019 R03 Stage 3 Submission Erika Taylor Michael Wyk 27/09/2019 Document Approval Erika Taylor Signature Director 18010_Moulamein_FS_Stage3_R03.docx Table of Contents Forward.................................................................................................................................. i Flood-Related Legislation, Policies and Guidelines ............................................................ i Terminology ...................................................................................................................... ii Executive Summary .............................................................................................................. iii 1 Introduction ................................................................................................................... 1 1.1 Overview ................................................................................................................. 1 1.2 Study Objectives ..................................................................................................... 1 1.3 Study Area Description ........................................................................................... 1 2 Study Methodology ........................................................................................................ 2 3 Consultation .................................................................................................................. 3 3.1 Floodplain Management Committee........................................................................ 3 3.2 Community Consultation ......................................................................................... 3 3.2.1 First Round ...................................................................................................... 3 4 Available Data ............................................................................................................... 5 4.1 Previous Studies ..................................................................................................... 5 4.1.1 Edward/Wakool Rivers Rural Floodplain Management Plan (Ref 11) ............... 5 4.1.2 Moulamein Levee Upgrade Flood Study (Ref 10) ............................................. 6 4.1.3 Edward River at Deniliquin Flood Study (Ref 12) ............................................. 7 4.2 Field Trips ............................................................................................................... 8 4.3 Topographic Data ................................................................................................... 9 4.3.1 Aerial-based Survey Data ................................................................................ 9 4.3.2 Ground-based Survey Data ........................................................................... 10 4.3.3 Verification of Aerial-based Survey Data with Ground-based Survey Data ..... 10 4.4 Historic Flood Data ............................................................................................... 10 4.4.1 SES Flood Intelligence Card .......................................................................... 10 4.4.2 Council Database .......................................................................................... 11 4.4.3 Old Court House and Library Archives ........................................................... 12 4.4.4 Landsat .......................................................................................................... 14 4.5 Historic Stream Data ............................................................................................. 14 4.5.1 Stream Gauges .............................................................................................. 14 4.6 Historic Rainfall Data ............................................................................................ 15 4.6.1 Rainfall Gauges ............................................................................................. 15 4.6.2 Analysis of Daily Rainfall Data ....................................................................... 16 4.6.3 Analysis of Pluviometer Rainfall Data............................................................. 18 5 Flood Frequency Analysis ........................................................................................... 19 5.1 Overview ............................................................................................................... 19 5.2 Annual Peak Heights............................................................................................. 19 5.3 Probability Distribution .......................................................................................... 20 18010_Moulamein_FS_Stage3_R03.docx 5.4 Results .................................................................................................................. 21 6 Hydraulic Model Development ..................................................................................... 23 6.1 Overview ............................................................................................................... 23 6.2 Digital Elevation Model ......................................................................................... 23 6.3 Hydraulic Roughness ............................................................................................ 23 6.4 Hydraulic Structures .............................................................................................. 24 6.4.1 Rural Levees.................................................................................................. 24 6.4.2 Town Levees ................................................................................................. 24 6.4.3 Edward River and Billabong Creek................................................................. 24 6.4.4 Tributaries and Divergences .......................................................................... 24 6.4.5 Bridges and Culverts ...................................................................................... 24 6.4.6 Buildings ........................................................................................................ 26 6.5 Initial Water Level Conditions ................................................................................ 26 6.6 Hydraulic Inflow and Outflow Conditions ............................................................... 26 6.6.1 Rural Model ................................................................................................... 26 6.6.2 Urban Model .................................................................................................. 27 7 Historical Flood Simulations ........................................................................................ 28 7.1 Overview ............................................................................................................... 28 7.2 Historic Event Selection .......................................................................................
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