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Richmond River Catchment History of Flood Modelling in the Richmond

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Richmond River Catchment History of Flood Modelling in the Richmond Richmond River Catchment 6,900km 2 catchment Towards a Catchment Based Model after 1,000km 2 floodplain Two Decades of Modelling in the Richmond 5 Local Councils Over 13 flood models built in 20 years for different areas Ben Caddis (BMT WBM) Michael Wood (Richmond River County Council) Various software and various Toong Chin (NSW Office of Environment and Heritage) schemes (1d, quasi-2d, 1d/2d) Brian Eggins (Richmond Valley Council) History of Flood Modelling in the Richmond History of Flood Modelling in the Richmond Year Location Purpose Software Modelling 1D Modelling Completed Method 1993 Lismore FS Mike 11 1D 1997 Ballina FS Estry 1D 1990’s Flood Mapping at Ballina 1998 Casino FS Mike 11 1D 1999 Mid-Richmond FS Mike 11 1D 2000 Deep Creek FIA (Summerland Way) Tuflow 1D/2D 2002 Casino FRMS Tuflow 1D/2D 2002 Lismore FRMS RMA2 2D 2003 Mid-Richmond FRMS Estry 1D 2004 Kyogle FS Tuflow 1D/2D 2004 Tuckombil Canal FS Tuflow 1D/2D 2006 Woodburn FIA (Pacific Hwy) Sobek 1D/2D 2006 Newrybar Swamp FIA (Pacific Hwy) Tuflow 1D/2D 2008 Ballina FS Upgrade Tuflow 1D/2D 2009 Kyogle FRMS Tuflow 1D/2D 2009 Wardell and Cabbage Tree Island FRMS RMA2 2D 2009 Ballina FIA (Ballina Bypass) Tuflow 1D/2D 2010 Mid-Richmond FMS Tuflow 1D/2D 2011 Ballina FRMS Tuflow 1D/2D 2012 Newrybar Swamp FRMS Tuflow 1D/2D History of Flood Modelling in the Richmond Issues with Current Approach 2D Modelling Inadequate coverage of rural areas Poor synchronisation of FRMPs Discrepancies at model interfaces Inconsistent modelling and mapping approaches Inadequate use of flood information for flood response Issues with Current Approach Issues with Current Approach Inadequate coverage of rural areas Poor synchronisation of FRMPs Year Location Purpose Software Modelling Completed Method 1993 Lismore FS Mike 11 1D 1997 Ballina FS Estry 1D 1998 Casino FS Mike 11 1D 1999 Mid-Richmond FS Mike 11 1D 2000 Deep Creek FIA (Summerland Way) Tuflow 1D/2D 2002 Casino FRMS Tuflow 1D/2D 2002 Lismore FRMS RMA2 2D 2003 Mid-Richmond FRMS Estry 1D 2004 Kyogle FS Tuflow 1D/2D 2004 Tuckombil Canal FS Tuflow 1D/2D 2006 Woodburn FIA (Pacific Hwy) Sobek 1D/2D 2006 Newrybar Swamp FIA (Pacific Hwy) Tuflow 1D/2D 2008 Ballina FS Upgrade Tuflow 1D/2D 2009 Kyogle FRMS Tuflow 1D/2D 2009 Wardell and Cabbage Tree Island FRMS RMA2 2D 2009 Ballina FIA (Ballina Bypass) Tuflow 1D/2D 2010 Mid-Richmond FMS Tuflow 1D/2D 2011 Ballina FRMS Tuflow 1D/2D 2012 Newrybar Swamp FRMS Tuflow 1D/2D Issues with Current Approach Issues with Current Approach Discrepancies at model interfaces Discrepancies at model interfaces Uncertainty associated with flood levels, velocities and hazard Different survey techniques Different modelling techniques Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inconsistent modelling and mapping approaches Design rainfall Temporal patterns Ballina IFD Consistency of parameters Hydrologic parameters Hydraulic parameters Consistency of data LiDAR / ALS Photogrammetery Bathymetry Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inconsistent modelling and mapping approaches Casino Lismore Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inadequate use of flood information for flood response Flood Modification Richmond Valley Interactive Flood Mapping Website Mitigation assessments / Impact assessments Structural works under construction / proposed for construction Live flood model for ongoing impact assessment Property Modification Minimum fill policy Flood risk precincts Response Modification Lismore Evacuation planning City BoM flood warning service Richmond Teven Valley flood warning system Valley Shire Community education Towards a Catchment Based Model Towards a Catchment Based Model Modular ‘mega’ model Modular ‘mega’ model Design rainfall Temporal patterns Ballina (10m, 20m, 40m) IFD Newrybar (10, 20m) Standardisation of parameters Mid Richmond (60m) Hydrologic parameters Casino (20m, 60m) Hydraulic parameters Lismore (5m, 20m, 60m) Consistency of data Wilsons River (20m) LiDAR / ALS Leycester Creek (20m) Photogrammetery Bathymetry 17 18 Towards a Catchment Based Model Looking Forward One single model run file Richmond Flood Database Catchment geometry Historical for calibration simulations Additional areas to be modelled and mapped Existing case for impact assessment benchmarking Standardisation of mapping Future case for impact assessments or planning purposes Flood event Refinements in areas for more detailed modelling Historical events (seven calibration events are currently incorporated representing significant floods across different parts of the catchment) Mitigation assessment Design events Black water event analyses various return periods various event durations Review of gauges joint probability event combinations Standardisation of datums tidal conditions climate change allowances Flood warning Location One or more of seven different sub-models Thank you.
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