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Condamine River: Flood Intelligence Review Draft for Public Review

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Condamine River: Flood Intelligence Review Draft for Public Review CONDAMINE RIVER: FLOOD INTELLIGENCE REVIEW DRAFT FOR PUBLIC REVIEW SEPTEMBER 2017 Toowoomba Regional Council PROJECT DETAILS Report Title Condamine River: Flood Intelligence Review Draft for Public Review Client Toowoomba Regional Council WMS Project Manager Blake Boulton Job Number Document Name 0022_Condamine_FI_Review_Draft.docx DOCUMENT STATUS Revision Doc Report Distributed Report Reviewer Number Type Author to Date 00 Draft TM BB TRC 13/09/2017 Draft for 01 Public TM BB Public 22/09/2017 Review REVISION STATUS Revision Number Description 00 Draft Report 01 Draft Report for Public Review COPYRIGHT AND NON-DISCLOSURE NOTICE The contents and layout of this report are subject to copyright owned by Water Modelling Solutions Pty Ltd (WMS). The report may not be copied or used without our prior written consent for any purpose other than the purpose indicated in this report. The sole purpose of this report and the associated services performed by WMS is to provide the information required in accordance with the scope of services set out in the contract between WMS and the Client. That scope of services was defined by the requests of the Client, by the time and budgetary constraints imposed by the Client, and by the availability of data and other relevant information. In preparing this report, WMS has assumed that all data, reports and any other information provided to us by the Client, on behalf of the Client, or by third parties is complete and accurate, unless stated otherwise. 0022_Condamine_FI_Review_Draft.docx | 22 September 2017 | Page i Contents 1 Introduction .................................................................................................................................... 1 1.1 Background ........................................................................................................................... 1 1.1.1 Project Background and Objectives .................................................................................. 1 1.1.2 Flood History ..................................................................................................................... 1 1.1.3 Modelling History .............................................................................................................. 1 1.2 Data Available ....................................................................................................................... 2 1.2.1 Modelling Data .................................................................................................................. 2 1.2.2 GIS Data ........................................................................................................................... 3 1.2.3 Gauge Data ....................................................................................................................... 3 1.2.4 Community Supplied Data ................................................................................................ 3 1.3 Study Area ............................................................................................................................ 3 1.3.1 Floodplain Topography ...................................................................................................... 3 1.3.2 Floodplain Development ................................................................................................... 3 1.3.3 Floodplain Community ...................................................................................................... 4 1.3.4 Catchment Area ................................................................................................................ 5 1.4 Study Methodology ............................................................................................................... 8 2 Site Visit and Landholder Meetings ............................................................................................... 9 2.1 Site Visit ................................................................................................................................ 9 2.2 Community Meetings ............................................................................................................ 9 2.2.1 Community Key Issues ..................................................................................................... 9 3 Stakeholder Consultation ............................................................................................................ 10 3.1 Agency Stakeholders .......................................................................................................... 10 3.1.1 BoM Data Provided ......................................................................................................... 10 4 Existing Gauge Analysis .............................................................................................................. 12 4.1 Existing Gauge Network ..................................................................................................... 12 4.1.1 Existing Rain Gauges ..................................................................................................... 13 4.2 Flood Timing and Levels ..................................................................................................... 14 4.2.1 Flood Timing ................................................................................................................... 14 4.2.2 Comparative Flood Levels .............................................................................................. 14 4.3 BoM Forecasts and Timing ................................................................................................. 16 4.4 Gauging Summary .............................................................................................................. 16 5 Hydraulic Modelling Analysis ....................................................................................................... 18 5.1 Modelled Events ................................................................................................................. 18 5.2 Flood Behaviour .................................................................................................................. 18 0022_Condamine_FI_Review_Draft.docx | 22 September 2017 | Page ii 5.2.1 Flood Depths ................................................................................................................... 19 5.2.2 Flood Velocities ............................................................................................................... 19 5.2.3 Flood Duration ................................................................................................................ 19 5.2.4 Flood Hazard .................................................................................................................. 21 5.3 Probability of Inundation ..................................................................................................... 21 5.4 Time to Inundation .............................................................................................................. 21 6 Flood Intelligence Products ......................................................................................................... 22 6.1 Flood Depth Relationships .................................................................................................. 22 6.2 Flood Timing ....................................................................................................................... 22 6.3 Flood Intelligence Cards ..................................................................................................... 22 7 Recommendations ....................................................................................................................... 27 7.1 Communication of Flood Warnings ..................................................................................... 27 7.1.1 Agency Communications ................................................................................................ 27 7.1.2 Community Communication ............................................................................................ 27 7.2 Expansion of Gauging Network .......................................................................................... 27 7.2.1 Tributary Inflows .............................................................................................................. 27 7.2.2 Major Breakouts .............................................................................................................. 27 7.2.3 Summary ......................................................................................................................... 28 7.3 Additional Modelling with Existing Tools ............................................................................. 30 7.3.1 Condamine River Model – Rising Hydrograph or Additional Smaller Events ................. 30 7.3.2 Rain on Grid Whole of LGA Modelling for Ungauged Tributaries ................................... 30 7.4 Scope for New Condamine Hydrological Model ................................................................. 31 8 References .................................................................................................................................. 32 9 Appendix A. Summary of Issues Raised During Community Meetings ...................................... 33 10 Appendix B: Evacuation Route Mapping ..................................................................................... 35 Table Index Table 1 Key Community Statistics for the Study Area .........................................................................
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